added touchpad support

touchpad.c

@@ -0,0 +1,60 @@
+#include "touchpad.h"
+
+static void spicb(SPIDriver *spip);
+static const SPIConfig spicfg = {
+	NULL,
+	GPIOC,
+	TP_CS,
+	SPI_CR1_SPE | SPI_CR1_BR_2 | SPI_CR1_BR_1 | SPI_CR1_BR_0,
+};
+
+void tpInit(void) {
+	spiStart(&SPID1, &spicfg);	
+}
+
+void tpWriteData(uint8_t data) {
+	uint16_t tx = 0xAA;
+
+	SET_CS(0);
+	spiSend(&SPID1, 1, &tx);
+	SET_CS(1);
+}
+
+uint16_t tpReadData(void) {
+
+}
+
+uint16_t tpReadX(void) {
+	uint8_t txbuf[1];
+	uint8_t rxbuf[2];
+	uint16_t x;
+
+	txbuf[0] = 0x90;
+	SET_CS(0);
+	spiSend(&SPID1, 1, txbuf);
+	spiReceive(&SPID1, 2, rxbuf);
+	SET_CS(1);
+
+	x = rxbuf[0] << 4;
+	x |= rxbuf[1] >> 4;
+
+	return x;
+}
+
+uint16_t tpReadY(void) {
+	uint8_t txbuf[1];
+    uint8_t rxbuf[2];
+    uint16_t y;
+
+    txbuf[0] = 0xd0;
+    SET_CS(0);
+    spiSend(&SPID1, 1, txbuf);
+    spiReceive(&SPID1, 2, rxbuf);
+    SET_CS(1);
+
+    y = rxbuf[0] << 4;
+    y |= rxbuf[1] >> 4;
+
+    return y;
+}
+

touchpad.h

@@ -0,0 +1,15 @@
+#ifndef TOUCHPAD_H
+#define TOUCHPAD_H
+
+#include "ch.h"
+#include "hal.h"
+
+#define SET_CS(a)		(TP_PORT->BSRR = 1 << (TP_CS + (a ? 0 : 16)))
+
+void tpInit(void);
+void tpWriteData(uint8_t data);
+uint16_t tpReadData(void);
+uint16_t tpReadX(void);
+uint16_t tpReadY(void);
+
+#endif