modulator: modulator.c annotate

annotate modulator.c @ 14:388074ff9474

Add fixed point code

author	Daniel O'Connor <darius@dons.net.au>
date	Tue, 25 Feb 2025 13:28:29 +1030
parents	e9d12b36cfcc
children	56a79dce90e9

rev	line source
0 a55e39064a71 First commit of code that compiles. Daniel O'Connor <darius@dons.net.au> parents: diff changeset	1 /******************************************************************
a55e39064a71 First commit of code that compiles. Daniel O'Connor <darius@dons.net.au> parents: diff changeset	2 *******************************************************************
a55e39064a71 First commit of code that compiles. Daniel O'Connor <darius@dons.net.au> parents: diff changeset	3 **
a55e39064a71 First commit of code that compiles. Daniel O'Connor <darius@dons.net.au> parents: diff changeset	4 ** This is proprietary unpublished source code, property
a55e39064a71 First commit of code that compiles. Daniel O'Connor <darius@dons.net.au> parents: diff changeset	5 ** of Genesis Software. Use or disclosure without prior
a55e39064a71 First commit of code that compiles. Daniel O'Connor <darius@dons.net.au> parents: diff changeset	6 ** agreement is expressly prohibited.
a55e39064a71 First commit of code that compiles. Daniel O'Connor <darius@dons.net.au> parents: diff changeset	7 **
a55e39064a71 First commit of code that compiles. Daniel O'Connor <darius@dons.net.au> parents: diff changeset	8 ** Copyright (c) 2021 Genesis Software, all rights reserved.
a55e39064a71 First commit of code that compiles. Daniel O'Connor <darius@dons.net.au> parents: diff changeset	9 **
a55e39064a71 First commit of code that compiles. Daniel O'Connor <darius@dons.net.au> parents: diff changeset	10 *******************************************************************
a55e39064a71 First commit of code that compiles. Daniel O'Connor <darius@dons.net.au> parents: diff changeset	11 ******************************************************************/
a55e39064a71 First commit of code that compiles. Daniel O'Connor <darius@dons.net.au> parents: diff changeset	12
a55e39064a71 First commit of code that compiles. Daniel O'Connor <darius@dons.net.au> parents: diff changeset	13 /*
a55e39064a71 First commit of code that compiles. Daniel O'Connor <darius@dons.net.au> parents: diff changeset	14 ** MODULATOR.C
a55e39064a71 First commit of code that compiles. Daniel O'Connor <darius@dons.net.au> parents: diff changeset	15 **
a55e39064a71 First commit of code that compiles. Daniel O'Connor <darius@dons.net.au> parents: diff changeset	16 ** Create modulation shape
a55e39064a71 First commit of code that compiles. Daniel O'Connor <darius@dons.net.au> parents: diff changeset	17 **
a55e39064a71 First commit of code that compiles. Daniel O'Connor <darius@dons.net.au> parents: diff changeset	18 */
a55e39064a71 First commit of code that compiles. Daniel O'Connor <darius@dons.net.au> parents: diff changeset	19
5 2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	20 #include <stdio.h>
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	21 #include <string.h>
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	22 #include "bitstring.h"
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	23
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	24 #pragma GCC diagnostic push
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	25 #pragma GCC diagnostic ignored "-Wtype-limits"
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	26 #pragma GCC diagnostic ignored "-Wsign-compare"
0 a55e39064a71 First commit of code that compiles. Daniel O'Connor <darius@dons.net.au> parents: diff changeset	27 #include "pico/stdlib.h"
a55e39064a71 First commit of code that compiles. Daniel O'Connor <darius@dons.net.au> parents: diff changeset	28 #include "hardware/clocks.h"
3 b10097c3383d DMA test data repeatedly into PIO FIFO Daniel O'Connor <darius@dons.net.au> parents: 2 diff changeset	29 #include "hardware/dma.h"
5 2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	30 #include "hardware/interp.h"
3 b10097c3383d DMA test data repeatedly into PIO FIFO Daniel O'Connor <darius@dons.net.au> parents: 2 diff changeset	31 #include "hardware/irq.h"
5 2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	32 #include "hardware/pll.h"
0 a55e39064a71 First commit of code that compiles. Daniel O'Connor <darius@dons.net.au> parents: diff changeset	33 #include "hardware/pio.h"
5 2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	34 #include "hardware/pwm.h"
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	35 #include "hardware/structs/pll.h"
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	36 #include "hardware/structs/clocks.h"
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	37 #pragma GCC diagnostic pop
0 a55e39064a71 First commit of code that compiles. Daniel O'Connor <darius@dons.net.au> parents: diff changeset	38
a55e39064a71 First commit of code that compiles. Daniel O'Connor <darius@dons.net.au> parents: diff changeset	39 #include "dac.pio.h"
9 3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	40 #include "trigger.pio.h"
0 a55e39064a71 First commit of code that compiles. Daniel O'Connor <darius@dons.net.au> parents: diff changeset	41
5 2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	42 // https://github.com/howerj/q
7 4ad473648949 Copy pulse up in reverse for pulse down. Daniel O'Connor <darius@dons.net.au> parents: 6 diff changeset	43 // Modified to be Q20.12 rather than Q16.16
5 2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	44 #include "q/q.h"
0 a55e39064a71 First commit of code that compiles. Daniel O'Connor <darius@dons.net.au> parents: diff changeset	45
5 2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	46 #include "shaped-trap.h"
3 b10097c3383d DMA test data repeatedly into PIO FIFO Daniel O'Connor <darius@dons.net.au> parents: 2 diff changeset	47
11 e9d12b36cfcc Use PWM output to feed PIO trigger Daniel O'Connor <darius@dons.net.au> parents: 10 diff changeset	48 // Base of DAC pins
e9d12b36cfcc Use PWM output to feed PIO trigger Daniel O'Connor <darius@dons.net.au> parents: 10 diff changeset	49 #define DACOUT_GPIO 7
e9d12b36cfcc Use PWM output to feed PIO trigger Daniel O'Connor <darius@dons.net.au> parents: 10 diff changeset	50 // PWM output pin
e9d12b36cfcc Use PWM output to feed PIO trigger Daniel O'Connor <darius@dons.net.au> parents: 10 diff changeset	51 #define TRIGOUT_GPIO 22
e9d12b36cfcc Use PWM output to feed PIO trigger Daniel O'Connor <darius@dons.net.au> parents: 10 diff changeset	52 // PIO SM trigger input pin (connected to above for testing)
e9d12b36cfcc Use PWM output to feed PIO trigger Daniel O'Connor <darius@dons.net.au> parents: 10 diff changeset	53 #define TRIGIN_GPIO 27
e9d12b36cfcc Use PWM output to feed PIO trigger Daniel O'Connor <darius@dons.net.au> parents: 10 diff changeset	54
9 3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	55 // Pulse control bits
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	56 #define SENSE 0x01
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	57 #define GATE 0x02
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	58 #define PHINV 0x04
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	59 #define PACTIVE 0x08
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	60
10 98880b18bcc1 Reset DAC PIO and use force trigger to do manual trigger. Daniel O'Connor <darius@dons.net.au> parents: 9 diff changeset	61 // DMA channel to feed DAC PIO
3 b10097c3383d DMA test data repeatedly into PIO FIFO Daniel O'Connor <darius@dons.net.au> parents: 2 diff changeset	62 static int dma_chan;
10 98880b18bcc1 Reset DAC PIO and use force trigger to do manual trigger. Daniel O'Connor <darius@dons.net.au> parents: 9 diff changeset	63 // Pulse shape data
5 2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	64 uint8_t pulse_data[65536];
10 98880b18bcc1 Reset DAC PIO and use force trigger to do manual trigger. Daniel O'Connor <darius@dons.net.au> parents: 9 diff changeset	65 // Pulse control data
5 2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	66 uint8_t pulse_ctrl[65536];
10 98880b18bcc1 Reset DAC PIO and use force trigger to do manual trigger. Daniel O'Connor <darius@dons.net.au> parents: 9 diff changeset	67 // PWM slice for PRF timer
9 3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	68 unsigned slice_num = 0;
10 98880b18bcc1 Reset DAC PIO and use force trigger to do manual trigger. Daniel O'Connor <darius@dons.net.au> parents: 9 diff changeset	69 // DAC PIO
98880b18bcc1 Reset DAC PIO and use force trigger to do manual trigger. Daniel O'Connor <darius@dons.net.au> parents: 9 diff changeset	70 PIO pulse_pio = pio0;
98880b18bcc1 Reset DAC PIO and use force trigger to do manual trigger. Daniel O'Connor <darius@dons.net.au> parents: 9 diff changeset	71 // DAC SM
9 3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	72 uint pulse_sm;
10 98880b18bcc1 Reset DAC PIO and use force trigger to do manual trigger. Daniel O'Connor <darius@dons.net.au> parents: 9 diff changeset	73 // Instruction offset for DAC PIO program
98880b18bcc1 Reset DAC PIO and use force trigger to do manual trigger. Daniel O'Connor <darius@dons.net.au> parents: 9 diff changeset	74 uint pulse_pio_sm_offset;
9 3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	75 /*
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	76 * Use a DMA channel to feed PIO0 SM0 with pulse data.
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	77 * Each DMA transfer is a single pulse.
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	78 *
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	79 * The PIO state machine waits to be triggered before starting
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	80 * so we can use another state machine to look for the trigger edge.
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	81 *
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	82 * When the DMA is done the IRQ handler will configure it for the next
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	83 * pulse (or not if it should stop). ie reset the PIO state machine
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	84 * back to waiting for an edge and re-arm the DMA.
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	85 */
3 b10097c3383d DMA test data repeatedly into PIO FIFO Daniel O'Connor <darius@dons.net.au> parents: 2 diff changeset	86 void
b10097c3383d DMA test data repeatedly into PIO FIFO Daniel O'Connor <darius@dons.net.au> parents: 2 diff changeset	87 dma_handler(void) {
11 e9d12b36cfcc Use PWM output to feed PIO trigger Daniel O'Connor <darius@dons.net.au> parents: 10 diff changeset	88 // Clear the interrupt request.
e9d12b36cfcc Use PWM output to feed PIO trigger Daniel O'Connor <darius@dons.net.au> parents: 10 diff changeset	89 dma_hw->ints0 = 1u << dma_chan;
e9d12b36cfcc Use PWM output to feed PIO trigger Daniel O'Connor <darius@dons.net.au> parents: 10 diff changeset	90
e9d12b36cfcc Use PWM output to feed PIO trigger Daniel O'Connor <darius@dons.net.au> parents: 10 diff changeset	91 // Reset DAQ PIO SM so it is waiting for a trigger
e9d12b36cfcc Use PWM output to feed PIO trigger Daniel O'Connor <darius@dons.net.au> parents: 10 diff changeset	92 pio_sm_exec(pulse_pio, pulse_sm, pio_encode_jmp(pulse_pio_sm_offset));
e9d12b36cfcc Use PWM output to feed PIO trigger Daniel O'Connor <darius@dons.net.au> parents: 10 diff changeset	93
e9d12b36cfcc Use PWM output to feed PIO trigger Daniel O'Connor <darius@dons.net.au> parents: 10 diff changeset	94 // Setup next pulse DMA address
e9d12b36cfcc Use PWM output to feed PIO trigger Daniel O'Connor <darius@dons.net.au> parents: 10 diff changeset	95 dma_channel_set_read_addr(dma_chan, pulse_data, true);
5 2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	96 }
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	97
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	98
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	99 void
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	100 pwm_wrap(void) {
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	101 pwm_clear_irq(slice_num);
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	102 }
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	103
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	104 // Calculate pulse shape data
8 0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	105 // TODO: predistortion, proper sense, gate, phase, active, T/R switch
5 2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	106 // Could encode them as bit stream like data but more compact would be
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	107 // (say) a list of counts to toggle pins at
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	108 // Need to add pre/postgate/sense/phase counters
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	109 unsigned
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	110 compute_pulse(uint8_t data, uint8_t ctrl, unsigned datalen, uint16_t plen, char code, uint8_t ncode, const uint8_t shape, uint8_t shapelen, uint8_t codegap, uint8_t slew1, uint8_t slew2, uint8_t dcofs) {
7 4ad473648949 Copy pulse up in reverse for pulse down. Daniel O'Connor <darius@dons.net.au> parents: 6 diff changeset	111 uint32_t shapesamples, nsamples, idx, bit1startup, bit1stopup;
5 2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	112 q_t dcscale, stepsize;
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	113 char tmps[20];
7 4ad473648949 Copy pulse up in reverse for pulse down. Daniel O'Connor <darius@dons.net.au> parents: 6 diff changeset	114 interp_config cfg;
4ad473648949 Copy pulse up in reverse for pulse down. Daniel O'Connor <darius@dons.net.au> parents: 6 diff changeset	115
8 0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	116 if (ncode == 1) {
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	117 // Number of samples for half of the pulse
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	118 // Do division first so we don't overflow Q16.16
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	119 shapesamples = qtoi(qmul(qdiv(qint(plen), qint(100)), qint(shapelen / 2)));
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	120 // Number of samples for everything
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	121 // XXX: Need the +1 otherwise slew2 is truncated
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	122 nsamples = shapesamples * 2 + slew1 + slew2 + 1;
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	123 } else {
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	124 shapesamples = plen / 2;
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	125 nsamples = shapesamples * 2 * ncode + codegap * (ncode - 1) + slew1 + slew2 + 1;
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	126 }
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	127
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	128 // Number of steps per samples in the pulse shape
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	129 stepsize = qdiv(qint(shapelen), qint(shapesamples));
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	130 qsprint(stepsize, tmps, sizeof(tmps));
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	131 printf("shapelen = %d shapesamples = %lu nsamples = %lu stepsize = %s\n", shapelen, shapesamples, nsamples, tmps);
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	132
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	133 // Check the requested pulse will not overflow given data
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	134 if (nsamples > datalen) {
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	135 printf("Pulse too long (%ld > %u)\n", nsamples, datalen);
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	136 return 0;
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	137 }
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	138 // Check it is not too short
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	139 if (shapesamples < 2) {
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	140 printf("Pulse too short (%lu < %d)\n", shapesamples, 2);
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	141 return 0;
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	142 }
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	143 // Or too long (will overflow for loop variable)
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	144 if (qtoi(shapesamples) > 65535) {
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	145 printf("Shape too long (%u > %d)\n", qtoi(shapesamples), 65535);
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	146 return 0;
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	147 }
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	148
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	149 // Setup interp 0 lane 0 to generate index into shape table
7 4ad473648949 Copy pulse up in reverse for pulse down. Daniel O'Connor <darius@dons.net.au> parents: 6 diff changeset	150 // Mask start is 0 because we use 8 bit samples
4ad473648949 Copy pulse up in reverse for pulse down. Daniel O'Connor <darius@dons.net.au> parents: 6 diff changeset	151 cfg = interp_default_config();
4ad473648949 Copy pulse up in reverse for pulse down. Daniel O'Connor <darius@dons.net.au> parents: 6 diff changeset	152 interp_config_set_shift(&cfg, QBITS);
4ad473648949 Copy pulse up in reverse for pulse down. Daniel O'Connor <darius@dons.net.au> parents: 6 diff changeset	153 interp_config_set_mask(&cfg, 0, 32 - QBITS);
4ad473648949 Copy pulse up in reverse for pulse down. Daniel O'Connor <darius@dons.net.au> parents: 6 diff changeset	154 interp_config_set_blend(&cfg, true);
4ad473648949 Copy pulse up in reverse for pulse down. Daniel O'Connor <darius@dons.net.au> parents: 6 diff changeset	155 interp_set_config(interp0, 0, &cfg);
4ad473648949 Copy pulse up in reverse for pulse down. Daniel O'Connor <darius@dons.net.au> parents: 6 diff changeset	156
8 0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	157 // Setup interp 0 lane 1 to LERP each sample pair
7 4ad473648949 Copy pulse up in reverse for pulse down. Daniel O'Connor <darius@dons.net.au> parents: 6 diff changeset	158 cfg = interp_default_config();
4ad473648949 Copy pulse up in reverse for pulse down. Daniel O'Connor <darius@dons.net.au> parents: 6 diff changeset	159 interp_config_set_shift(&cfg, QBITS - 8);
4ad473648949 Copy pulse up in reverse for pulse down. Daniel O'Connor <darius@dons.net.au> parents: 6 diff changeset	160 interp_config_set_signed(&cfg, false);
4ad473648949 Copy pulse up in reverse for pulse down. Daniel O'Connor <darius@dons.net.au> parents: 6 diff changeset	161 interp_config_set_cross_input(&cfg, true); // unsigned blending
4ad473648949 Copy pulse up in reverse for pulse down. Daniel O'Connor <darius@dons.net.au> parents: 6 diff changeset	162 interp_set_config(interp0, 1, &cfg);
4ad473648949 Copy pulse up in reverse for pulse down. Daniel O'Connor <darius@dons.net.au> parents: 6 diff changeset	163
8 0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	164 // Setup interp 1 lane 0 to clamp 0-255
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	165 cfg = interp_default_config();
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	166 interp_config_set_clamp(&cfg, true);
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	167 interp_config_set_shift(&cfg, 0);
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	168 interp_config_set_mask(&cfg, 0, 8);
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	169 interp_config_set_signed(&cfg, false);
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	170 interp_set_config(interp1, 0, &cfg);
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	171 interp1->base[0] = 0;
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	172 interp1->base[1] = 255;
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	173
7 4ad473648949 Copy pulse up in reverse for pulse down. Daniel O'Connor <darius@dons.net.au> parents: 6 diff changeset	174 interp0->accum[0] = 0; // Initial offset into shape table
4ad473648949 Copy pulse up in reverse for pulse down. Daniel O'Connor <darius@dons.net.au> parents: 6 diff changeset	175 interp0->base[2] = (uintptr_t)shape; // Start of shape table
5 2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	176
8 0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	177 dcscale = qdiv(qsub(qint(256), qint(dcofs)), qint(255));
5 2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	178 qsprint(dcscale, tmps, sizeof(tmps));
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	179 printf("dcscale = %s\n", tmps);
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	180
8 0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	181 memset(pulse_data, 0, sizeof(pulse_data));
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	182 memset(pulse_ctrl, 0, sizeof(pulse_ctrl));
5 2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	183 idx = 0;
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	184
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	185 // Up slew
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	186 for (uint16_t i = 0; i < slew1; i++) {
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	187 data[idx++] = qtoi(qdiv(qmul(qint(dcofs), qint(i)), qint(slew1)));
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	188 ctrl[idx] \|= PACTIVE;
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	189 }
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	190 for (uint16_t c = 0; c < ncode; c++) {
7 4ad473648949 Copy pulse up in reverse for pulse down. Daniel O'Connor <darius@dons.net.au> parents: 6 diff changeset	191 if (c == 0)
4ad473648949 Copy pulse up in reverse for pulse down. Daniel O'Connor <darius@dons.net.au> parents: 6 diff changeset	192 bit1startup = idx;
4ad473648949 Copy pulse up in reverse for pulse down. Daniel O'Connor <darius@dons.net.au> parents: 6 diff changeset	193
5 2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	194 uint ctrltmp = PACTIVE;
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	195 if (code[c] == '0')
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	196 ctrltmp \|= PHINV;
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	197
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	198 // Pulse up
8 0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	199 if (c == 0) {
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	200 interp0->accum[0] = 0; // Initial offset into shape table
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	201 interp0->base[2] = (uintptr_t)shape; // Start of shape table
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	202 }
5 2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	203 for (uint16_t i = 0; i < shapesamples; i++) {
8 0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	204 if (c == 0) {
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	205 // Get sample pair
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	206 uint8_t sample_pair = (uint8_t ) interp0->peek[2];
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	207 // Ask lane 1 for a LERP, using the lane 0 accumulator
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	208 interp0->base[0] = sample_pair[0];
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	209 interp0->base[1] = sample_pair[1];
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	210 uint8_t peek = interp0->peek[1];
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	211 // Apply DC offset scaling & clamp
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	212 interp1->accum[0] = dcofs + qtoi(qmul(qint(peek), dcscale));
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	213 data[idx++] = interp1->peek[0];
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	214 // Update interpolator for next point
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	215 interp0->add_raw[0] = stepsize;
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	216 } else
7 4ad473648949 Copy pulse up in reverse for pulse down. Daniel O'Connor <darius@dons.net.au> parents: 6 diff changeset	217 // Already done it before, just copy the previous instance
4ad473648949 Copy pulse up in reverse for pulse down. Daniel O'Connor <darius@dons.net.au> parents: 6 diff changeset	218 data[idx++] = data[bit1startup + i];
5 2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	219 ctrl[idx] = ctrltmp;
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	220 }
7 4ad473648949 Copy pulse up in reverse for pulse down. Daniel O'Connor <darius@dons.net.au> parents: 6 diff changeset	221 if (c == 0)
4ad473648949 Copy pulse up in reverse for pulse down. Daniel O'Connor <darius@dons.net.au> parents: 6 diff changeset	222 bit1stopup = idx - 1;
5 2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	223 // Pulse down
7 4ad473648949 Copy pulse up in reverse for pulse down. Daniel O'Connor <darius@dons.net.au> parents: 6 diff changeset	224 // Since the pulse is symmetrical just copy the up slope in reverse
8 0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	225 // XXX: if we had asymmetrical predistortion this wouldn't be true
5 2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	226 for (uint16_t i = 0; i < shapesamples; i++) {
7 4ad473648949 Copy pulse up in reverse for pulse down. Daniel O'Connor <darius@dons.net.au> parents: 6 diff changeset	227 data[idx++] = data[bit1stopup - i];
5 2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	228 // Could replace this with a separate loop to poke it into place
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	229 // Similarly for TR switch when implemented
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	230 if (i == 0 && c == 0)
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	231 ctrl[idx] = ctrltmp \| SENSE;
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	232 else
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	233 ctrl[idx] = ctrltmp;
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	234 }
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	235
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	236 // Code gap
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	237 if (c < ncode - 1)
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	238 for (uint16_t i = 0; i < codegap; i++) {
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	239 data[idx++] = dcofs;
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	240 ctrl[idx] = ctrltmp;
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	241 }
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	242 }
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	243
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	244 // Down slew
8 0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	245 for (uint16_t i = 0; i < slew2 + 1; i++) {
5 2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	246 data[idx++] = qtoi(qdiv(qmul(qint(dcofs), qint(slew2 - i)), qint(slew2)));
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	247 ctrl[idx] \|= PACTIVE;
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	248 }
11 e9d12b36cfcc Use PWM output to feed PIO trigger Daniel O'Connor <darius@dons.net.au> parents: 10 diff changeset	249
e9d12b36cfcc Use PWM output to feed PIO trigger Daniel O'Connor <darius@dons.net.au> parents: 10 diff changeset	250 data[idx++] = 0;
e9d12b36cfcc Use PWM output to feed PIO trigger Daniel O'Connor <darius@dons.net.au> parents: 10 diff changeset	251
e9d12b36cfcc Use PWM output to feed PIO trigger Daniel O'Connor <darius@dons.net.au> parents: 10 diff changeset	252 return idx;
5 2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	253 }
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	254
0 a55e39064a71 First commit of code that compiles. Daniel O'Connor <darius@dons.net.au> parents: diff changeset	255 int
3 b10097c3383d DMA test data repeatedly into PIO FIFO Daniel O'Connor <darius@dons.net.au> parents: 2 diff changeset	256 main(void) {
5 2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	257 absolute_time_t then, now;
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	258
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	259 // Set sysclk to 120MHz
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	260 set_sys_clock_khz(120000, true);
0 a55e39064a71 First commit of code that compiles. Daniel O'Connor <darius@dons.net.au> parents: diff changeset	261
a55e39064a71 First commit of code that compiles. Daniel O'Connor <darius@dons.net.au> parents: diff changeset	262 stdio_init_all();
5 2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	263 printf("\n\n\nIniting\n");
0 a55e39064a71 First commit of code that compiles. Daniel O'Connor <darius@dons.net.au> parents: diff changeset	264
5 2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	265 // Needed otherwise timer related functions hang under debugging
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	266 // https://github.com/raspberrypi/pico-sdk/issues/1152#issuecomment-1418248639
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	267 timer_hw->dbgpause = 0;
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	268
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	269 gpio_init(PICO_DEFAULT_LED_PIN);
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	270 gpio_set_dir(PICO_DEFAULT_LED_PIN, GPIO_OUT);
9 3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	271 gpio_init(2);
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	272 gpio_set_dir(2, GPIO_OUT);
11 e9d12b36cfcc Use PWM output to feed PIO trigger Daniel O'Connor <darius@dons.net.au> parents: 10 diff changeset	273
9 3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	274 #if 0
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	275 for (unsigned i = 7; i < 7 + 9; i++) {
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	276 printf("GPIO %d\n", i);
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	277 gpio_init(i);
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	278 gpio_set_dir(i, GPIO_OUT);
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	279 printf("on\n");
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	280 gpio_put(i, 1);
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	281 __breakpoint();
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	282 printf("off\n");
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	283 gpio_put(i, 0);
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	284 __breakpoint();
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	285 }
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	286 #endif
5 2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	287
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	288 uint32_t idx;
8 0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	289 uint16_t plen;
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	290 char *code;
9 3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	291 if (1) {
8 0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	292 plen = 8000;
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	293 code = "1110010";
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	294 } else {
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	295 plen = 53000;
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	296 code = "1";
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	297 }
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	298
5 2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	299 uint8_t codegap = 4;
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	300 uint8_t slew1 = 10;
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	301 uint8_t slew2 = 10;
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	302 uint8_t dcofs = 110;
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	303 then = get_absolute_time();
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	304 if ((idx = compute_pulse(pulse_data, pulse_ctrl, sizeof(pulse_data),
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	305 plen, code, strlen(code),
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	306 shaped_trap, sizeof(shaped_trap),
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	307 codegap, slew1, slew2, dcofs)) == 0) {
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	308 printf("Failed to compute pulse\n");
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	309 while (1)
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	310 ;
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	311 }
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	312 now = get_absolute_time();
8 0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	313 unsigned long long diff = absolute_time_diff_us(then, now);
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	314 printf("Pulse computation took %lld usec and created %lu samples - %.1f nsec/sample\n",
0249d0cecac4 Use interpolator to compute pulse up. Daniel O'Connor <darius@dons.net.au> parents: 7 diff changeset	315 diff, idx, (float)diff * 1000.0 / idx);
10 98880b18bcc1 Reset DAC PIO and use force trigger to do manual trigger. Daniel O'Connor <darius@dons.net.au> parents: 9 diff changeset	316 //__breakpoint();
9 3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	317
11 e9d12b36cfcc Use PWM output to feed PIO trigger Daniel O'Connor <darius@dons.net.au> parents: 10 diff changeset	318 // Load the DAC program, and configure a free state machine
9 3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	319 // to run the program.
10 98880b18bcc1 Reset DAC PIO and use force trigger to do manual trigger. Daniel O'Connor <darius@dons.net.au> parents: 9 diff changeset	320 pulse_pio_sm_offset = pio_add_program(pulse_pio, &dac_program);
11 e9d12b36cfcc Use PWM output to feed PIO trigger Daniel O'Connor <darius@dons.net.au> parents: 10 diff changeset	321 pulse_sm = pio_claim_unused_sm(pulse_pio, true);
9 3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	322 // Data is GPIO7 to GPIO14, clock is GPIO15
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	323 // Clock divisor of 2 so it runs at 60MHz and
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	324 // generates a 30MHz clock
11 e9d12b36cfcc Use PWM output to feed PIO trigger Daniel O'Connor <darius@dons.net.au> parents: 10 diff changeset	325 dac_program_init(pulse_pio, pulse_sm, pulse_pio_sm_offset, DACOUT_GPIO, 2);
9 3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	326
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	327 // Configure a channel to write 32 bits at a time to PIO0
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	328 // SM0's TX FIFO, paced by the data request signal from that peripheral.
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	329 dma_chan = dma_claim_unused_channel(true);
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	330 dma_channel_config dmac = dma_channel_get_default_config(dma_chan);
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	331 channel_config_set_transfer_data_size(&dmac, DMA_SIZE_32);
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	332 channel_config_set_read_increment(&dmac, true);
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	333 channel_config_set_dreq(&dmac, DREQ_PIO0_TX0);
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	334
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	335 dma_channel_configure(
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	336 dma_chan,
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	337 &dmac,
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	338 &pio0_hw->txf[0], // Write address (only need to set this once)
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	339 NULL, // Don't provide a read address yet
11 e9d12b36cfcc Use PWM output to feed PIO trigger Daniel O'Connor <darius@dons.net.au> parents: 10 diff changeset	340 (idx + 3) >> 2, // Transfer count (round up to 4 bytes)
9 3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	341 false // Don't start yet
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	342 );
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	343
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	344 // Tell the DMA to raise IRQ line 0 when the channel finishes a block
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	345 dma_channel_set_irq0_enabled(dma_chan, true);
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	346
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	347 // Configure the processor to run dma_handler() when DMA IRQ 0 is asserted
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	348 irq_set_exclusive_handler(DMA_IRQ_0, dma_handler);
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	349 irq_set_enabled(DMA_IRQ_0, true);
3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	350
11 e9d12b36cfcc Use PWM output to feed PIO trigger Daniel O'Connor <darius@dons.net.au> parents: 10 diff changeset	351 // Load the trigger program, and configure a free state machine
e9d12b36cfcc Use PWM output to feed PIO trigger Daniel O'Connor <darius@dons.net.au> parents: 10 diff changeset	352 // to run the program.
e9d12b36cfcc Use PWM output to feed PIO trigger Daniel O'Connor <darius@dons.net.au> parents: 10 diff changeset	353 uint trigger_pio_sm_offset = pio_add_program(pulse_pio, &trigger_program);
e9d12b36cfcc Use PWM output to feed PIO trigger Daniel O'Connor <darius@dons.net.au> parents: 10 diff changeset	354 uint trigger_sm = pio_claim_unused_sm(pulse_pio, true);
e9d12b36cfcc Use PWM output to feed PIO trigger Daniel O'Connor <darius@dons.net.au> parents: 10 diff changeset	355 trigger_program_init(pulse_pio, trigger_sm, trigger_pio_sm_offset, TRIGIN_GPIO, 2);
e9d12b36cfcc Use PWM output to feed PIO trigger Daniel O'Connor <darius@dons.net.au> parents: 10 diff changeset	356
e9d12b36cfcc Use PWM output to feed PIO trigger Daniel O'Connor <darius@dons.net.au> parents: 10 diff changeset	357 //
e9d12b36cfcc Use PWM output to feed PIO trigger Daniel O'Connor <darius@dons.net.au> parents: 10 diff changeset	358 // Setup PWM
e9d12b36cfcc Use PWM output to feed PIO trigger Daniel O'Connor <darius@dons.net.au> parents: 10 diff changeset	359 // Used here to output a trigger which gets fed back into the trigger SM
e9d12b36cfcc Use PWM output to feed PIO trigger Daniel O'Connor <darius@dons.net.au> parents: 10 diff changeset	360 //
5 2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	361 // 120MHz / 250 = 480kHz base
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	362 // Maximum divisor is only 256 which limits the low end,
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	363 // could further subdivide in the IRQ handler
9 3acdebd7eec7 Make it actually work Daniel O'Connor <darius@dons.net.au> parents: 8 diff changeset	364 pwm_config c = pwm_get_default_config();
5 2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	365 pwm_config_set_clkdiv_int(&c, 250);
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	366 // 8Hz
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	367 pwm_config_set_wrap(&c, 60000 - 1);
11 e9d12b36cfcc Use PWM output to feed PIO trigger Daniel O'Connor <darius@dons.net.au> parents: 10 diff changeset	368
e9d12b36cfcc Use PWM output to feed PIO trigger Daniel O'Connor <darius@dons.net.au> parents: 10 diff changeset	369 gpio_set_function(TRIGOUT_GPIO, GPIO_FUNC_PWM);
e9d12b36cfcc Use PWM output to feed PIO trigger Daniel O'Connor <darius@dons.net.au> parents: 10 diff changeset	370
e9d12b36cfcc Use PWM output to feed PIO trigger Daniel O'Connor <darius@dons.net.au> parents: 10 diff changeset	371 slice_num = pwm_gpio_to_slice_num(TRIGOUT_GPIO);
5 2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	372 pwm_init(slice_num, &c, true);
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	373 pwm_clear_irq(slice_num);
11 e9d12b36cfcc Use PWM output to feed PIO trigger Daniel O'Connor <darius@dons.net.au> parents: 10 diff changeset	374 pwm_set_chan_level(slice_num, PWM_CHAN_A, 1);
e9d12b36cfcc Use PWM output to feed PIO trigger Daniel O'Connor <darius@dons.net.au> parents: 10 diff changeset	375 pwm_set_enabled(slice_num, 1);
5 2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	376 pwm_set_irq_enabled(slice_num, true);
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	377 irq_set_exclusive_handler(PWM_IRQ_WRAP, pwm_wrap);
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	378 irq_set_enabled(PWM_IRQ_WRAP, true);
11 e9d12b36cfcc Use PWM output to feed PIO trigger Daniel O'Connor <darius@dons.net.au> parents: 10 diff changeset	379
e9d12b36cfcc Use PWM output to feed PIO trigger Daniel O'Connor <darius@dons.net.au> parents: 10 diff changeset	380 // Setup next pulse DMA address
e9d12b36cfcc Use PWM output to feed PIO trigger Daniel O'Connor <darius@dons.net.au> parents: 10 diff changeset	381 // XXX: This works but telling dma_channel_configure above to start
e9d12b36cfcc Use PWM output to feed PIO trigger Daniel O'Connor <darius@dons.net.au> parents: 10 diff changeset	382 // immediately does not
e9d12b36cfcc Use PWM output to feed PIO trigger Daniel O'Connor <darius@dons.net.au> parents: 10 diff changeset	383 dma_channel_set_read_addr(dma_chan, pulse_data, true);
0 a55e39064a71 First commit of code that compiles. Daniel O'Connor <darius@dons.net.au> parents: diff changeset	384
3 b10097c3383d DMA test data repeatedly into PIO FIFO Daniel O'Connor <darius@dons.net.au> parents: 2 diff changeset	385 // Everything else from this point is interrupt-driven. The processor has
b10097c3383d DMA test data repeatedly into PIO FIFO Daniel O'Connor <darius@dons.net.au> parents: 2 diff changeset	386 // time to sit and think about its early retirement -- maybe open a bakery?
0 a55e39064a71 First commit of code that compiles. Daniel O'Connor <darius@dons.net.au> parents: diff changeset	387 while (true) {
5 2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	388 gpio_put(PICO_DEFAULT_LED_PIN, 1);
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	389 sleep_ms(100);
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	390 gpio_put(PICO_DEFAULT_LED_PIN, 0);
2 0d653f60dec8 Actually get data moving out. Daniel O'Connor <darius@dons.net.au> parents: 0 diff changeset	391 sleep_ms(100);
0 a55e39064a71 First commit of code that compiles. Daniel O'Connor <darius@dons.net.au> parents: diff changeset	392 }
5 2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	393
2db42eaba3c8 WIP Daniel O'Connor <darius@dons.net.au> parents: 3 diff changeset	394 __breakpoint();
0 a55e39064a71 First commit of code that compiles. Daniel O'Connor <darius@dons.net.au> parents: diff changeset	395 }

Mercurial > ~darius > hgwebdir.cgi > modulator

annotate modulator.c @ 14:388074ff9474