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trezor-firmware/embed/trezorhal/touch.c

91 lines
2.4 KiB
C

/*
* Copyright (c) Pavol Rusnak, SatoshiLabs
*
* Licensed under TREZOR License
* see LICENSE file for details
*/
#include STM32_HAL_H
#include <string.h>
#include "common.h"
#include "secbool.h"
#include "touch.h"
I2C_HandleTypeDef i2c_handle = {
.Instance = I2C1,
};
void touch_init(void)
{
// Enable I2C clock
__HAL_RCC_I2C1_CLK_ENABLE();
// Init SCL and SDA GPIO lines (PB6 & PB7)
GPIO_InitTypeDef GPIO_InitStructure = {
.Pin = GPIO_PIN_6 | GPIO_PIN_7,
.Mode = GPIO_MODE_AF_OD,
.Pull = GPIO_NOPULL,
.Speed = GPIO_SPEED_FREQ_VERY_HIGH,
.Alternate = GPIO_AF4_I2C1,
};
HAL_GPIO_Init(GPIOB, &GPIO_InitStructure);
I2C_InitTypeDef *init = &(i2c_handle.Init);
init->OwnAddress1 = 0xFE; // master
init->ClockSpeed = 400000;
init->DutyCycle = I2C_DUTYCYCLE_16_9;
init->AddressingMode = I2C_ADDRESSINGMODE_7BIT;
init->DualAddressMode = I2C_DUALADDRESS_DISABLE;
init->GeneralCallMode = I2C_GENERALCALL_DISABLE;
init->NoStretchMode = I2C_NOSTRETCH_DISABLE;
init->OwnAddress2 = 0;
ensure(sectrue * (HAL_OK == HAL_I2C_Init(&i2c_handle)), NULL);
}
#define TOUCH_ADDRESS 56
#define TOUCH_PACKET_SIZE 16
uint32_t touch_read(void)
{
static uint8_t data[TOUCH_PACKET_SIZE], old_data[TOUCH_PACKET_SIZE];
if (HAL_OK != HAL_I2C_Master_Receive(&i2c_handle, TOUCH_ADDRESS << 1, data, TOUCH_PACKET_SIZE, 1)) {
return 0; // read failure
}
if (0 == memcmp(data, old_data, TOUCH_PACKET_SIZE)) {
return 0; // no new event
}
memcpy(old_data, data, TOUCH_PACKET_SIZE);
if (data[0] == 0xff && data[1] == 0x00) {
if (data[2] == 0x01 && data[3] == 0x00) {
return TOUCH_START | (data[4] << 8) | data[6]; // touch start
} else
if (data[2] == 0x01 && data[3] == 0x80) {
return TOUCH_MOVE | (data[4] << 8) | data[6]; // touch move
} else
if (data[2] == 0x00 && data[3] == 0x40) {
return TOUCH_END | (data[4] << 8) | data[6]; // touch end
}
}
return 0;
}
uint32_t touch_click(void)
{
uint32_t r;
// flush touch events if any
while (touch_read()) { }
// wait for TOUCH_START
while ((touch_read() & TOUCH_START) == 0) { }
// wait for TOUCH_END
while (((r = touch_read()) & TOUCH_END) == 0) { }
// flush touch events if any
while (touch_read()) { }
// return last touch coordinate
return r;
}