HAL_ADC_Start_DMA

HAL_ADC_Start_DMA is a function in the HAL library for STM32 microcontrollers that starts the ADC conversion process using DMA (Direct Memory Access).

When the ADC is started with DMA, the converted data is automatically transferred to a memory buffer without CPU intervention. This reduces the load on the CPU and allows for more efficient and faster data transfer.

The function takes as parameters the ADC handle (which specifies the ADC module to use), the memory buffer to store the converted data, the number of elements in the buffer, and the DMA transfer mode.

Here is an example usage of HAL_ADC_Start_DMA:

uint16_t adc_buffer[100];
HAL_ADC_Start_DMA(&hadc1, (uint32_t*)adc_buffer, 100);

This code starts the ADC conversion process using DMA with ADC module 1 and stores the converted data in the adc_buffer array. The array has 100 elements (assuming each conversion returns a 16-bit value).