79 lines
1.2 KiB
C
79 lines
1.2 KiB
C
#include "touchpad.h"
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#include "glcd.h"
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static void spicb(SPIDriver *spip);
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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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uint16_t tpReadX(void) {
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uint32_t results;
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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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uint16_t tpReadY(void) {
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uint32_t results;
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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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