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/*
* This file is subject to the terms of the GFX License. If a copy of
* the license was not distributed with this file, you can obtain one at:
*
* http://ugfx.io/license.html
*/
/**
* @file boards/addons/ginput/touch/ADS7843/ginput_lld_mouse_board_st_stm32f4_discovery.h
* @brief GINPUT Touch low level driver source for the ADS7843 on an st_stm32f4_discovery.
*
* @note This file contains a mix of hardware specific and operating system specific
* code. You will need to change it for your CPU and/or operating system.
*/
#ifndef _GINPUT_LLD_MOUSE_BOARD_H
#define _GINPUT_LLD_MOUSE_BOARD_H
/*
* uGFX port used: ChibiOS/RT
*
* SCK: GPIOB, 13
* MISO: GPIOB, 14
* MOSI: GPIOB, 15
* CS: GPIOC, 4
* IRC: GPIOC, 5
*
* Note that you can tweak the SPI bus speed
*/
static const SPIConfig spicfg = {
0,
GPIOC,
4,
/* SPI_CR1_BR_2 |*/ SPI_CR1_BR_1 | SPI_CR1_BR_0,
};
// Resolution and Accuracy Settings
#define GMOUSE_ADS7843_PEN_CALIBRATE_ERROR 8
#define GMOUSE_ADS7843_PEN_CLICK_ERROR 6
#define GMOUSE_ADS7843_PEN_MOVE_ERROR 4
#define GMOUSE_ADS7843_FINGER_CALIBRATE_ERROR 14
#define GMOUSE_ADS7843_FINGER_CLICK_ERROR 18
#define GMOUSE_ADS7843_FINGER_MOVE_ERROR 14
// How much extra data to allocate at the end of the GMouse structure for the board's use
#define GMOUSE_ADS7843_BOARD_DATA_SIZE 0
static gBool init_board(GMouse* m, unsigned driverinstance) {
(void)m;
// Only one touch interface on this board
if (driverinstance)
return gFalse;
// Set the GPIO modes
palSetPadMode(GPIOC, 6, PAL_MODE_OUTPUT_PUSHPULL);
palSetPadMode(GPIOC, 4, PAL_MODE_INPUT);
palSetPadMode(GPIOA, 5, PAL_MODE_ALTERNATE(5));
palSetPadMode(GPIOA, 6, PAL_MODE_ALTERNATE(5));
palSetPadMode(GPIOA, 7, PAL_MODE_ALTERNATE(5));
// Start the SPI peripheral
spiStart(&SPID1, &spicfg);
return gTrue;
}
static GFXINLINE gBool getpin_pressed(GMouse* m) {
(void) m;
return (!palReadPad(GPIOC, 4));
}
static GFXINLINE void aquire_bus(GMouse* m) {
(void) m;
spiAcquireBus(&SPID1);
palClearPad(GPIOC, 6);
}
static GFXINLINE void release_bus(GMouse* m) {
(void) m;
palSetPad(GPIOC, 6);
spiReleaseBus(&SPID1);
}
static GFXINLINE uint16_t read_value(GMouse* m, uint16_t port) {
static uint8_t txbuf[3] = {0};
static uint8_t rxbuf[3] = {0};
(void) m;
txbuf[0] = port;
spiExchange(&SPID1, 3, txbuf, rxbuf);
return ((uint16_t)rxbuf[1] << 5) | (rxbuf[2] >> 3);
}
#endif /* _GINPUT_LLD_MOUSE_BOARD_H */
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