GD32 DMA — RAM → RAM

Tue, 08 Sep 2026 14:52:21 +0800

DMA — RAM → RAM

固件库: GD32F30x_Firmware_Library V3.0.3
芯片: GD32
源文件: GD32F30x_Firmware_Library_V3.0.3/Examples/DMA/Ram_to_ram/main.c

功能简介

本示例演示 DMA（直接存储器访问）的基本用法。DMA 可以在不占用 CPU 的情况下，在内存和外设之间搬运数据，大幅提升系统效率。

完整代码

#include "gd32f30x.h" 
#include "gd32f307c_eval.h"
#include <string.h>
#define DATANUM                  16
__IO ErrStatus transferflag1 = ERROR;
__IO ErrStatus transferflag2 = ERROR;
__IO ErrStatus transferflag3 = ERROR;
__IO ErrStatus transferflag4 = ERROR;

void destbuf_init(void);
void led_config(void);
ErrStatus uc_data_compare(uint8_t* src, uint8_t* dst, uint16_t length);

/*!
    \brief      main function
    \param[in]  none
    \param[out] none
    \retval     none
*/
int main(void)
{
    int i = 0;
    dma_parameter_struct dma_init_struct;
    
    /* enable DMA clock */
    rcu_periph_clock_enable(RCU_DMA0);
    /* initialize LED */
    led_config();
    /* all LED off */
    gd_eval_led_off(LED2);
    gd_eval_led_off(LED3);
    gd_eval_led_off(LED4);
    gd_eval_led_off(LED5);
    
    destbuf_init();
    /* initialize DMA channel1 */
    dma_deinit(DMA0, DMA_CH1);
    
    dma_init_struct.direction = DMA_PERIPHERAL_TO_MEMORY;
    dma_init_struct.memory_addr = (uint32_t)destination_address1;
    dma_init_struct.memory_inc = DMA_MEMORY_INCREASE_ENABLE;
    dma_init_struct.memory_width = DMA_MEMORY_WIDTH_8BIT;
    dma_init_struct.number = DATANUM;
    dma_init_struct.periph_addr = (uint32_t)source_address;
    dma_init_struct.periph_inc = DMA_PERIPH_INCREASE_ENABLE;
    dma_init_struct.periph_width = DMA_PERIPHERAL_WIDTH_8BIT;
    dma_init_struct.priority = DMA_PRIORITY_ULTRA_HIGH;
    dma_init(DMA0, DMA_CH1, &dma_init_struct);
    /* configure DMA mode */
    dma_circulation_disable(DMA0, DMA_CH1);
    dma_memory_to_memory_enable(DMA0, DMA_CH1);
        
    /* initialize DMA channel2 */
    dma_deinit(DMA0, DMA_CH2);
    dma_init_struct.memory_addr = (uint32_t)destination_address2;
    dma_init(DMA0, DMA_CH2, &dma_init_struct);
    /* configure DMA mode */
    dma_circulation_disable(DMA0, DMA_CH2);
    dma_memory_to_memory_enable(DMA0, DMA_CH2);
        
    /* initialize DMA channel3 */
    dma_deinit(DMA0, DMA_CH3);
    dma_init_struct.memory_addr = (uint32_t)destination_address3;
    dma_init(DMA0, DMA_CH3, &dma_init_struct);
    /* configure DMA mode */
    dma_circulation_disable(DMA0, DMA_CH3);
    dma_memory_to_memory_enable(DMA0, DMA_CH3);
        
    /* initialize DMA channel4 */
    dma_deinit(DMA0, DMA_CH4);
    dma_init_struct.memory_addr = (uint32_t)destination_address4;
    dma_init(DMA0, DMA_CH4, &dma_init_struct);
    /* configure DMA mode */
    dma_circulation_disable(DMA0, DMA_CH4);
    dma_memory_to_memory_enable(DMA0, DMA_CH4);

    /* enable DMA channel1~channel4 */
    dma_channel_enable(DMA0, DMA_CH1);
    dma_channel_enable(DMA0, DMA_CH2);
    dma_channel_enable(DMA0, DMA_CH3);
    dma_channel_enable(DMA0, DMA_CH4);

    /* wait for DMA transfer complete */
    for(i = 0; i < 200; i++);
    /* compare the data of source_address with data of destination_address */
    transferflag1 = uc_data_compare(source_address, destination_address1, DATANUM);
    transferflag2 = uc_data_compare(source_address, destination_address2, DATANUM);
    transferflag3 = uc_data_compare(source_address, destination_address3, DATANUM);
    transferflag4 = uc_data_compare(source_address, destination_address4, DATANUM);

    /* if DMA channel1 transfer success,light LED2 */
    if(SUCCESS == transferflag1){
        gd_eval_led_on(LED2);
    }
    /* if DMA channel2 transfer success,light LED3 */
    if(SUCCESS == transferflag2){
        gd_eval_led_on(LED3);
    }
    /* if DMA channel3 transfer success,light LED4 */
    if(SUCCESS == transferflag3){
        gd_eval_led_on(LED4);
    }
    /* if DMA channel4 transfer success,light LED5 */
    if(SUCCESS == transferflag4){
        gd_eval_led_on(LED5);
    }
    
    while (1);
}

void destbuf_init(void)
{
    memset(destination_address1, 0, DATANUM);
    memset(destination_address2, 0, DATANUM);
    memset(destination_address3, 0, DATANUM);
    memset(destination_address4, 0, DATANUM);
}

void led_config(void)
{
    gd_eval_led_init (LED2);
    gd_eval_led_init (LED3);
    gd_eval_led_init (LED4);
    gd_eval_led_init (LED5);
}

代码讲解

DMA 配置：设置源地址、目标地址、传输方向、数据宽度。DMA 搬运数据不占用 CPU。

Ram_to_ram on CLing

GD32 DMA — RAM → RAM

DMA — RAM → RAM

功能简介

完整代码

代码讲解