mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-10-11 18:39:05 +00:00
42 lines
1.4 KiB
C
42 lines
1.4 KiB
C
extern void i2c_init(I2C_HandleTypeDef *i2c);
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extern HAL_StatusTypeDef HAL_I2C_Master_Receive(I2C_HandleTypeDef *hi2c, uint16_t DevAddress, uint8_t *pData, uint16_t Size, uint32_t Timeout);
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static I2C_HandleTypeDef touch_i2c_handle;
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void touch_init(void)
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{
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I2C_InitTypeDef *init = &(touch_i2c_handle.Init);
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init->OwnAddress1 = 0xFE; // master
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init->ClockSpeed = 400000;
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init->DutyCycle = I2C_DUTYCYCLE_16_9;
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init->AddressingMode = I2C_ADDRESSINGMODE_7BIT;
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init->DualAddressMode = I2C_DUALADDRESS_DISABLED;
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init->GeneralCallMode = I2C_GENERALCALL_DISABLED;
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init->NoStretchMode = I2C_NOSTRETCH_DISABLED;
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init->OwnAddress2 = 0;
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i2c_init(&touch_i2c_handle);
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}
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uint32_t touch_read(void)
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{
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static uint8_t data[16], old_data[16];
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if (HAL_OK != HAL_I2C_Master_Receive(&touch_i2c_handle, 56 << 1, data, 16, 1)) {
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return 0; // read failure
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}
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if (0 == memcmp(data, old_data, 16)) {
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return 0; // no new event
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}
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uint32_t r = 0;
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if (old_data[2] == 0 && data[2] == 1) {
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r = 0x00010000 + (data[4] << 8) + data[6]; // touch start
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} else
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if (old_data[2] == 1 && data[2] == 1) {
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r = 0x00020000 + (data[4] << 8) + data[6]; // touch move
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}
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if (old_data[2] == 1 && data[2] == 0) {
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r = 0x00040000 + (data[4] << 8) + data[6]; // touch end
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}
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memcpy(old_data, data, 16);
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return r;
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}
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