STM32 ADC

What is ADC?

ADC stands for Analog-to-Digital Converter, which converts analog signals (e.g., voltages) into digital values. This allows us to interact with and make sense of real-world analog data, such as sensor readings or external signals.

.ioc Configuration

1. Pin Configuration:

   Go to the "Pinout & Configuration" tab. Select the pins you want to use for your ADC input channels. These pins should be configured as "Analog" in the "Mode" column.

2. ADC Configuration:

   Go to the "Peripherals" tab and click on "Analog ADCX." Configure the ADC settings, including the resolution, conversion mode, sampling time, and other parameters, depending on your requirements. Configure the trigger source for ADC conversions if necessary. Enable or disable the DMA request if you want to use DMA for data transfer.

3. Clock Configuration:

   Go to the "RCC Configuration" tab and configure the clock source and prescaler for the ADC as needed.

4. NVIC Configuration (Optional):

   Go to the "Configuration" tab. Enable the ADC interrupts if you plan to use them for handling ADC conversions.

Code

1. Start ADC

   HAL_ADC_Start(&hadc1);
   

2. Main loop access

   while (1) {
       // Wait for the ADC conversion to complete
       HAL_ADC_PollForConversion(&hadc1, HAL_MAX_DELAY);
       
       // Read the ADC converted value
       uint32_t adcValue = HAL_ADC_GetValue(&hadc1);
       
       // Your application code to process the ADC value
       // You can use adcValue for your specific application.
     }
   }
   

3. Configure the ADC using the HAL (Automatically generated by STM32CubeMX)

   if (HAL_ADC_Init(&hadc1) != HAL_OK) {
       Error_Handler();
     }
     
     sConfig.Channel = ADC_CHANNEL_0; // Replace with your chosen ADC channel
     sConfig.Rank = 1;
     sConfig.SamplingTime = ADC_SAMPLETIME_3CYCLES;
     if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK) {
       Error_Handler();
     }
   }
   

4. Error Handling (Automatically generated by STM32CubeMX)

   void Error_Handler(void) {
     // Handle ADC initialization errors here
     while (1) {
       // Error handling code
     }
   }
   
   #ifdef USE_FULL_ASSERT
   void assert_failed(uint8_t* file, uint32_t line) {
     // User-defined assert_failed() function
     // You can customize error handling here
   }
   #endif