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https://github.com/trezor/trezor-firmware.git
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118 lines
4.0 KiB
C
118 lines
4.0 KiB
C
/*
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* Copyright (c) Pavol Rusnak, SatoshiLabs
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*
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* Licensed under TREZOR License
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* see LICENSE file for details
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*/
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#include STM32_HAL_H
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#include <string.h>
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#include "common.h"
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#include "secbool.h"
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#include "touch.h"
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static I2C_HandleTypeDef i2c_handle;
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void touch_init(void)
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{
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GPIO_InitTypeDef GPIO_InitStructure;
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// Enable I2C clock
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__HAL_RCC_I2C1_CLK_ENABLE();
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// Init SCL and SDA GPIO lines (PB6 & PB7)
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GPIO_InitStructure.Pin = GPIO_PIN_6 | GPIO_PIN_7;
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GPIO_InitStructure.Mode = GPIO_MODE_AF_OD;
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GPIO_InitStructure.Pull = GPIO_NOPULL;
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GPIO_InitStructure.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
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GPIO_InitStructure.Alternate = GPIO_AF4_I2C1;
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HAL_GPIO_Init(GPIOB, &GPIO_InitStructure);
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i2c_handle.Instance = I2C1;
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i2c_handle.Init.ClockSpeed = 400000;
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i2c_handle.Init.DutyCycle = I2C_DUTYCYCLE_16_9;
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i2c_handle.Init.OwnAddress1 = 0xFE; // master
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i2c_handle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
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i2c_handle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
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i2c_handle.Init.OwnAddress2 = 0;
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i2c_handle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
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i2c_handle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
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ensure(sectrue * (HAL_OK == HAL_I2C_Init(&i2c_handle)), NULL);
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// PC5 capacitive touch panel module reset (RSTN)
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GPIO_InitStructure.Pin = GPIO_PIN_5;
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GPIO_InitStructure.Mode = GPIO_MODE_OUTPUT_PP;
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GPIO_InitStructure.Pull = GPIO_PULLUP;
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GPIO_InitStructure.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
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GPIO_InitStructure.Alternate = 0;
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HAL_GPIO_Init(GPIOC, &GPIO_InitStructure);
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// reset the touch panel by toggling the reset line (active low)
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HAL_GPIO_WritePin(GPIOC, GPIO_PIN_5, GPIO_PIN_SET);
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HAL_Delay(10); // being conservative, min is 5ms
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HAL_GPIO_WritePin(GPIOC, GPIO_PIN_5, GPIO_PIN_RESET);
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HAL_Delay(10); // being conservative, min is 5ms
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HAL_GPIO_WritePin(GPIOC, GPIO_PIN_5, GPIO_PIN_SET);
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HAL_Delay(310); // "Time of starting to report point after resetting" min is 300ms
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}
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#define TOUCH_ADDRESS (0x38U << 1) // the HAL requires the 7-bit address to be shifted by one bit
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#define TOUCH_PACKET_SIZE 7U
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#define EVENT_PRESS_DOWN 0x00U
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#define EVENT_CONTACT 0x80U
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#define EVENT_LIFT_UP 0x40U
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#define EVENT_NO_EVENT 0xC0U
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#define GESTURE_NO_GESTURE 0x00U
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#define X_POS_MSB (touch_data[3] & 0xFU)
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#define X_POS_LSB (touch_data[4])
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#define Y_POS_MSB (touch_data[5] & 0xFU)
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#define Y_POS_LSB (touch_data[6])
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#define X_Y_POS ((X_POS_MSB << 20) | (X_POS_LSB << 12) | (Y_POS_MSB << 8) | (Y_POS_LSB))
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uint32_t touch_read(void)
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{
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static uint8_t touch_data[TOUCH_PACKET_SIZE], previous_touch_data[TOUCH_PACKET_SIZE];
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if (HAL_OK != HAL_I2C_Master_Receive(&i2c_handle, TOUCH_ADDRESS, touch_data, TOUCH_PACKET_SIZE, 1)) {
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return 0; // read failure
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}
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if (0 == memcmp(previous_touch_data, touch_data, TOUCH_PACKET_SIZE)) {
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return 0; // polled and got the same event again
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} else {
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memcpy(previous_touch_data, touch_data, TOUCH_PACKET_SIZE);
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}
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const uint32_t number_of_touch_points = touch_data[2] & 0x0F; // valid values are 0, 1, 2 (invalid 0xF before first touch) (tested with FT6206)
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const uint32_t event_flag = touch_data[3] & 0xC0;
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if (touch_data[1] == GESTURE_NO_GESTURE) {
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if ((number_of_touch_points == 1) && (event_flag == EVENT_PRESS_DOWN)) {
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return TOUCH_START | X_Y_POS;
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} else if ((number_of_touch_points == 1) && (event_flag == EVENT_CONTACT)) {
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return TOUCH_MOVE | X_Y_POS;
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} else if ((number_of_touch_points == 0) && (event_flag == EVENT_LIFT_UP)) {
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return TOUCH_END | X_Y_POS;
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}
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}
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return 0;
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}
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uint32_t touch_click(void)
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{
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uint32_t r = 0;
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// flush touch events if any
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while (touch_read()) { }
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// wait for TOUCH_START
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while ((touch_read() & TOUCH_START) == 0) { }
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// wait for TOUCH_END
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while (((r = touch_read()) & TOUCH_END) == 0) { }
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// flush touch events if any
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while (touch_read()) { }
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// return last touch coordinate
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return r;
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}
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