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annotate touch.c @ 24:1e2fa7396f98

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Reduce prescaler to 2, the flash is capable of 25MHz reads (although the touch screen is limited to ~2.5MHz)
author Daniel O'Connor <darius@dons.net.au>
date Sat, 17 Nov 2012 12:17:58 +1030
parents 58d76cf522ff
children
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8
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1 #include <stdint.h>
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2
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3 #include "stm32f10x.h"
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4 #include "delay.h"
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5 #include "spi.h"
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6 #include "touch.h"
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7
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8 #define TP_SELECT() GPIO_ResetBits(GPIOB, GPIO_Pin_7)
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9 #define TP_DESELECT() GPIO_SetBits(GPIOB, GPIO_Pin_7)
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10
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11 uint16_t
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12 tp_read(uint8_t type) {
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13 uint16_t x = 0;
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14
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15 /* Select device */
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16 TP_SELECT();
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17
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18 /* Do conversion */
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19 delay(10);
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20 SPI_WriteByte(type);
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21
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22 /* Read result */
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23 delay(10);
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24 x = SPI_WriteByte(0x00);
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25 x <<= 8;
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26 x |= SPI_WriteByte(0x00);
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27 delay(10);
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28
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29 /* De-select device */
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30 TP_DESELECT();
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31
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32 /* Right justify 12 bit result */
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33 x = x >> 3;
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34 return (x);
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35 }
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36
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37 void
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38 tp_getcoords(uint16_t *x, uint16_t *y, uint16_t *z1, uint16_t *z2, float *t, float *t2) {
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39 *x = tp_read(TP_READ_SEL(TP_CHAN_X, TP_MODE_12, TP_REF_DIFF, TP_PD_ON));
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40 *y = tp_read(TP_READ_SEL(TP_CHAN_Y, TP_MODE_12, TP_REF_DIFF, TP_PD_ON));
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41 *z1 = tp_read(TP_READ_SEL(TP_CHAN_Z1, TP_MODE_12, TP_REF_DIFF, TP_PD_ON));
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42 *z2 = tp_read(TP_READ_SEL(TP_CHAN_Z2, TP_MODE_12, TP_REF_DIFF, TP_PD_ON));
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43 *t = ((float)*x / 4096.0) * (((float)*z2 / (float)*z1) - 1);
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44 *t2 = (((float)*x / 4096) * ((4096.0 / (float)*z1) - 1)) - (1 - ((float)*y / (float)4096.0));
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45 }