134 lines
2.8 KiB
C
134 lines
2.8 KiB
C
#include "touchpad.h"
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#include "glcd.h"
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static struct cal cal;
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static const SPIConfig spicfg = {
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NULL,
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GPIOC,
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TP_CS,
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SPI_CR1_SPE | SPI_CR1_BR_2 | SPI_CR1_BR_1 | SPI_CR1_BR_0,
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};
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void tpInit(void) {
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spiStart(&SPID1, &spicfg);
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}
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static __inline uint16_t readX(void) {
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uint8_t txbuf[1];
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uint8_t rxbuf[2];
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uint16_t x;
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txbuf[0] = 0xd0;
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SET_CS(0);
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spiSend(&SPID1, 1, txbuf);
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spiReceive(&SPID1, 2, rxbuf);
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SET_CS(1);
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x = rxbuf[0] << 4;
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x |= rxbuf[1] >> 4;
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return x;
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}
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static __inline uint16_t readY(void) {
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uint8_t txbuf[1];
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uint8_t rxbuf[2];
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uint16_t y;
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txbuf[0] = 0x90;
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SET_CS(0);
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spiSend(&SPID1, 1, txbuf);
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spiReceive(&SPID1, 2, rxbuf);
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SET_CS(1);
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y = rxbuf[0] << 4;
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y |= rxbuf[1] >> 4;
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return y;
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}
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uint8_t tpIRQ(void) {
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return (!palReadPad(TP_PORT, TP_IRQ));
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}
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static uint16_t tpReadRealX(void) {
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uint32_t results = 0;
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uint16_t i, x;
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for(i=0; i<CONVERSIONS; i++) {
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readX();
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results += readX();
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}
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x = (((lcdGetHeight()-1) * (results/CONVERSIONS)) / 2048);
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return x;
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}
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static uint16_t tpReadRealY(void) {
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uint32_t results = 0;
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uint16_t i, y;
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for(i=0; i<CONVERSIONS; i++) {
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readY();
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results += readY();
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}
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y = (((lcdGetWidth()-1) * (results/CONVERSIONS)) / 2048);
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return y;
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}
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uint16_t tpReadX(void) {
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return cal.xm * tpReadRealX() + cal.xn;
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}
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uint16_t tpReadY(void) {
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return cal.ym * tpReadRealY() + cal.yn;
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}
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void tpDrawCross(uint16_t x, uint16_t y) {
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lcdDrawLine(x-15, y, x-2, y, 0xffff);
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lcdDrawLine(x+2, y, x+15, y, 0xffff);
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lcdDrawLine(x, y-15, x, y-2, 0xffff);
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lcdDrawLine(x, y+2, x, y+15, 0xffff);
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lcdDrawLine(x-15, y+15, x-7, y+15, RGB565CONVERT(184, 158, 131));
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lcdDrawLine(x-15, y+7, x-15, y+15, RGB565CONVERT(184, 158, 131));
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lcdDrawLine(x-15, y-15, x-7, y-15, RGB565CONVERT(184, 158, 131));
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lcdDrawLine(x-15, y-7, x-15, y-15, RGB565CONVERT(184, 158, 131));
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lcdDrawLine(x+7, y+15, x+15, y+15, RGB565CONVERT(184, 158, 131));
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lcdDrawLine(x+15, y+7, x+15, y+15, RGB565CONVERT(184, 158, 131));
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lcdDrawLine(x+7, y-15, x+15, y-15, RGB565CONVERT(184, 158, 131));
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lcdDrawLine(x+15, y-15, x+15, y-7, RGB565CONVERT(184, 158, 131));
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}
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void tpCalibrate(void) {
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uint16_t cross[2][2] = {{40,40}, {200, 280}};
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uint16_t points[2][2];
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uint8_t i;
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lcdClear(Red);
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lcdDrawString(40, 10, "Touchpad Calibration", White, Red);
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for(i=0; i<2; i++) {
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tpDrawCross(cross[i][0], cross[i][1]);
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while(!tpIRQ());
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points[i][0] = tpReadRealX();
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points[i][1] = tpReadRealY();
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while(tpIRQ());
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lcdFillArea(cross[i][0]-15, cross[i][1]-15, cross[i][0]+16, cross[i][1]+16, Red);
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}
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cal.xm = ((float)cross[1][0] - (float)cross[0][0]) / ((float)points[1][0] - (float)points[0][0]);
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cal.ym = ((float)cross[1][1] - (float)cross[0][1]) / ((float)points[1][1] - (float)points[0][1]);
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cal.xn = (float)cross[0][0] - cal.xm * (float)points[0][0];
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cal.yn = (float)cross[0][1] - cal.ym * (float)points[0][1];
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}
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