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trezor-firmware/micropython/extmod/modtrezormsg/touch.h

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2017-02-16 13:12:32 +00:00
extern I2C_HandleTypeDef I2CHandle1;
extern void i2c_init(I2C_HandleTypeDef *i2c);
extern HAL_StatusTypeDef HAL_I2C_Master_Receive(I2C_HandleTypeDef *hi2c, uint16_t DevAddress, uint8_t *pData, uint16_t Size, uint32_t Timeout);
void touch_init(void)
{
I2C_InitTypeDef *init = &(I2CHandle1.Init);
init->OwnAddress1 = 0xFE; // master
init->ClockSpeed = 400000;
init->DutyCycle = I2C_DUTYCYCLE_16_9;
init->AddressingMode = I2C_ADDRESSINGMODE_7BIT;
init->DualAddressMode = I2C_DUALADDRESS_DISABLED;
init->GeneralCallMode = I2C_GENERALCALL_DISABLED;
init->NoStretchMode = I2C_NOSTRETCH_DISABLED;
init->OwnAddress2 = 0;
i2c_init(&I2CHandle1);
}
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uint32_t touch_read(void)
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{
static uint8_t data[16], old_data[16];
if (HAL_OK != HAL_I2C_Master_Receive(&I2CHandle1, 56 << 1, data, 16, 1)) {
return 0; // read failure
}
if (0 == memcmp(data, old_data, 16)) {
return 0; // no new event
}
uint32_t r = 0;
if (old_data[2] == 0 && data[2] == 1) {
r = 0x00010000 + (data[4] << 8) + data[6]; // touch start
} else
if (old_data[2] == 1 && data[2] == 1) {
r = 0x00020000 + (data[4] << 8) + data[6]; // touch move
}
if (old_data[2] == 1 && data[2] == 0) {
r = 0x00040000 + (data[4] << 8) + data[6]; // touch end
}
memcpy(old_data, data, 16);
return r;
}