/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
#define CS_PIN GPIO_PIN_8
#define CS_PORT GPIOA

/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
void delay_in_us (uint16_t time_in_us)
{
	uint8_t fac = 0;
	__HAL_TIM_SET_COUNTER(&htim1,0);
	fac = (time_in_us >= 2) ? 1 : 0;
	while (__HAL_TIM_GET_COUNTER(&htim1) < time_in_us-fac);
}

void get_angle(void)
{
	uint8_t tx_data[10] = {0x55, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
	uint8_t rx_data[10] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};

	// Start transaction
	HAL_GPIO_WritePin(CS_PORT, CS_PIN, GPIO_PIN_RESET);
	delay_in_us(20);

	HAL_SPI_Transmit(&hspi1, tx_data, 10, HAL_MAX_DELAY);
	HAL_SPI_Receive(&hspi1, rx_data, 10, HAL_MAX_DELAY);
	
	HAL_GPIO_WritePin(CS_PORT, CS_PIN, GPIO_PIN_SET);

	// Calculation angle
	uint16_t data_bytes = (rx_data[2] << 8) | rx_data[3];
	uint16_t first14 = data_bytes >> 2;
	float value = (float)first14 / 16384.0f;
	float angle = (value - 0.1f) / (0.9f - 0.1f) * 360.0f;
}


  /* USER CODE BEGIN 2 */
  HAL_TIM_Base_Start(&htim1);
  HAL_GPIO_WritePin(CS_PORT, CS_PIN, GPIO_PIN_SET);    // CS_PIN high initially