Direct Memory Access (DMA) Implementation in Linux Device Drivers
DMA enables peripherals to transfer data directly between memory and hardware registers without CPU intervention. In Linux, DMA operations replace CPU-driven data writes to device registers, such as SPI_DATA for SPI communication, shifting from writel(data, SPI_DATA) to automated buffer transfers.
Key considerations include address handling: CP ...
Posted on Sun, 12 Jul 2026 16:47:00 +0000 by chet23
Multi-Channel ADC Data Acquisition Using DMA on STM32
Configure the ADC to sample across 5 channels and enable DMA in circular mode.
Buffer Definition and Initialization
#define CHANNEL_COUNT 5
#define SAMPLES_PER_CHANNEL 100
static uint16_t raw_adc_buffer[CHAMPLES_PER_CHANNEL * CHANNEL_COUNT];
/**
* @brief Initialize ADC calibration and start DMA transfer
*/
void ADC_Startup(void)
{ ...
Posted on Tue, 23 Jun 2026 17:54:34 +0000 by Magestic
STM32 DMA Transmission Issues and Solutions
Issue 1: Unexpected Data Transmission with DMA
#include "stm32f10x.h"
#include "Delay.h"
#include "DMA.h"
#include "Serial.h"
uint8_t dataBuffer[3];
int main(void)
{
/* Module initialization */
OLED_Init();
Key_Init();
Serial_Init();
MyDMA_TX_Init(DMA1_Channel4, (uint32_t)&USART1- ...
Posted on Tue, 02 Jun 2026 16:04:21 +0000 by kir10s