HAL_GPIO_WritePin(GPIOD,MUX_SEL3_Pin, GPIO_PIN_SET);
HAL_GPIO_WritePin(SPI3_CS_GPIO_Port, SPI3_CS_Pin, GPIO_PIN_RESET);
HAL_SPI_Receive(&hspi3, (uint8_t*)&Calibrartion[0],sizeof(ADC_Value), 100);
HAL_SPI_Receive(&hspi3, (uint8_t*)&Calibrartion[1],sizeof(ADC_Value), 100);
HAL_GPIO_WritePin(SPI3_CS_GPIO_Port, SPI3_CS_Pin, GPIO_PIN_SET); // 24 Clock pulses
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
ADC_Value=0;
INPUT_VOLTAGE=0;
/*
The least significant bit for the device is given by:
1 LSB = VREF / 2^N
where:
• VREF = Voltage applied between the AVDD and GND pins
• N = 12
*/
HAL_GPIO_WritePin(SPI3_CS_GPIO_Port, SPI3_CS_Pin, GPIO_PIN_RESET);
HAL_SPI_Receive(&hspi3, (uint8_t*)&ADC_Value,sizeof(ADC_Value), 100);
HAL_GPIO_WritePin(SPI3_CS_GPIO_Port, SPI3_CS_Pin, GPIO_PIN_SET);
//INPUT VOLTAGE = (ADC Value / ADC Resolution) * Reference Voltage
printf("ADC_Value=%x\n\r",ADC_Value);
INPUT_VOLTAGE=((ADC_Value >> 3)/4096)*3.3;
printf("ADC_Value=%x\n\r",ADC_Value);
printf("INPUT_VOLTAGE=%f\n\r",INPUT_VOLTAGE);
HAL_Delay(50); // 50 Msec
}
This is my code but I applied 3.3v but I get the zero value why?
