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comparison dac.pio @ 5:2db42eaba3c8

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WIP
author Daniel O'Connor <darius@dons.net.au>
date Sat, 15 Feb 2025 22:57:18 +1030
parents 0d653f60dec8
children 3acdebd7eec7
comparison
equal deleted inserted replaced
4:b6416c4aadc8 5:2db42eaba3c8
17 nop side 1 17 nop side 1
18 out pins 8 side 0 18 out pins 8 side 0
19 .wrap 19 .wrap
20 20
21 % c-sdk { 21 % c-sdk {
22 static inline void dac_program_init(PIO pio, uint sm, uint offset, uint pin) { 22 static inline void dac_program_init(PIO pio, uint sm, uint offset, uint pin, uint clkdiv) {
23 pio_sm_config c = dac_program_get_default_config(offset); 23 pio_sm_config c = dac_program_get_default_config(offset);
24 24
25 // Set the OUT base pin to the provided `pin` parameter. 25 // Set the OUT base pin to the provided `pin` parameter.
26 // First 8 pins are data, last is clock 26 // First 8 pins are data, last is clock
27 sm_config_set_out_pins(&c, pin, 9); 27 sm_config_set_out_pins(&c, pin, 9);
33 33
34 sm_config_set_out_shift( 34 sm_config_set_out_shift(
35 &c, 35 &c,
36 true, // Shift-to-right 36 true, // Shift-to-right
37 false, // Autopull enabled 37 false, // Autopull enabled
38 8 // Autopull threshold (bits!) 38 32 // Autopull threshold (bits!)
39 ); 39 );
40 40
41 // Configure clock as sideset pin 41 // Configure clock as sideset pin
42 sm_config_set_sideset_pins(&c, pin + 7); 42 sm_config_set_sideset_pins(&c, pin + 7);
43 43
44 // We only send, so disable the RX FIFO to make the TX FIFO deeper. 44 // We only send, so disable the RX FIFO to make the TX FIFO deeper.
45 sm_config_set_fifo_join(&c, PIO_FIFO_JOIN_TX); 45 sm_config_set_fifo_join(&c, PIO_FIFO_JOIN_TX);
46 46
47 // sm_config_set_clkdiv(&c, 100); 47 sm_config_set_clkdiv(&c, clkdiv);
48 48
49 // Load our configuration, and start the program from the beginning 49 // Load our configuration, and start the program from the beginning
50 pio_sm_init(pio, sm, offset, &c); 50 pio_sm_init(pio, sm, offset, &c);
51 pio_sm_set_enabled(pio, sm, true); 51 pio_sm_set_enabled(pio, sm, true);
52 } 52 }