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touch: reset touch panel

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mcudev 2017-11-03 20:57:57 -04:00 committed by Pavol Rusnak
parent d9a64fbb6a
commit 15bdc59b46
1 changed files with 22 additions and 7 deletions
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29
embed/trezorhal/touch.c
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@ -17,17 +17,17 @@ static I2C_HandleTypeDef i2c_handle;
void touch_init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
// 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,
};
GPIO_InitStructure.Pin = GPIO_PIN_6 | GPIO_PIN_7;
GPIO_InitStructure.Mode = GPIO_MODE_AF_OD;
GPIO_InitStructure.Pull = GPIO_NOPULL;
GPIO_InitStructure.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStructure.Alternate = GPIO_AF4_I2C1;
HAL_GPIO_Init(GPIOB, &GPIO_InitStructure);
i2c_handle.Instance = I2C1;
@ -41,6 +41,21 @@ void touch_init(void)
i2c_handle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
ensure(sectrue * (HAL_OK == HAL_I2C_Init(&i2c_handle)), NULL);
// PC5 capacitive touch panel module reset (RSTN)
GPIO_InitStructure.Pin = GPIO_PIN_5;
GPIO_InitStructure.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStructure.Pull = GPIO_PULLUP;
GPIO_InitStructure.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStructure.Alternate = 0;
HAL_GPIO_Init(GPIOC, &GPIO_InitStructure);
// reset the touch panel by toggling the reset line (active low)
HAL_GPIO_WritePin(GPIOC, GPIO_PIN_5, GPIO_PIN_SET);
HAL_Delay(10); // being conservative, min is 5ms
HAL_GPIO_WritePin(GPIOC, GPIO_PIN_5, GPIO_PIN_RESET);
HAL_Delay(10); // being conservative, min is 5ms
HAL_GPIO_WritePin(GPIOC, GPIO_PIN_5, GPIO_PIN_SET);
HAL_Delay(310); // "Time of starting to report point after resetting" min is 300ms
}
#define TOUCH_ADDRESS (0x38U << 1) // the HAL requires the 7-bit address to be shifted by one bit