DMA使用

最新推荐文章于 2024-05-13 06:49:14 发布

原创最新推荐文章于 2024-05-13 06:49:14 发布 · 1k 阅读

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CC 4.0 BY-SA版权

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#单片机 #嵌入式硬件

文章详细介绍了GD32F30x单片机中DMA0Channel0、3和4的配置，涉及内存到内存传输、内存到外设发送和外设到内存接收的功能，以及中断处理和USART通信的集成。

内存到内存（dma基础配置）

#include "gd32f30x.h"

void DMA0_Channel0_IRQHandler(){
   if( dma_interrupt_flag_get(DMA0,DMA_CH0,DMA_INT_FLAG_FTF) ){
       dma_interrupt_flag_clear(DMA0,DMA_CH0,DMA_INT_FLAG_FTF);
   }
}

int main(){
   static const unsigned char data0[10] = {1,2,3,4,5,6,7,8,9,10};
   unsigned char data1[10] = {0};

   rcu_periph_clock_enable(RCU_DMA0);
   dma_deinit(DMA0,DMA_CH0);
   dma_memory_to_memory_enable(DMA0,DMA_CH0);

   dma_parameter_struct dmaCfg;
   dma_struct_para_init(&dmaCfg);
   dmaCfg.periph_addr = data0;
dmaCfg.periph_width = DMA_PERIPHERAL_WIDTH_8BIT;
dmaCfg.periph_inc = DMA_PERIPH_INCREASE_ENABLE;
dmaCfg.memory_addr = data1;
dmaCfg.memory_width = DMA_PERIPHERAL_WIDTH_8BIT;
dmaCfg.memory_inc = DMA_MEMORY_INCREASE_ENABLE;
dmaCfg.number = 10;
dmaCfg.direction = DMA_PERIPHERAL_TO_MEMORY;
dmaCfg.priority = DMA_PRIORITY_LOW;
   dma_init(DMA0,DMA_CH0,&dmaCfg);

   dma_interrupt_enable(DMA0,DMA_CH0,DMA_INT_FLAG_FTF);
   nvic_irq_enable(DMA0_Channel0_IRQn,2,2);

   dma_circulation_enable(DMA0,DMA_CH0);
   dma_channel_enable(DMA0,DMA_CH0);

   while(1){
   }


}

内存到外设（发送）

#include "gd32f30x.h"

dma_parameter_struct dmaTxCfg;

void UsartDmaSend(unsigned char* pData, int nLen){
   while( dmaSending );
dmaSending = 1;
dma_channel_disable(DMA0,DMA_CH3);
   dmaTxCfg.memory_addr = pData;
   dmaTxCfg.number = nLen;
   dma_init(DMA0,DMA_CH3,&dmaTxCfg);
   dma_channel_enable(DMA0,DMA_CH3);
}

void UsartDmaCfg(){
   rcu_periph_clock_enable(RCU_AF);
   rcu_periph_clock_enable(RCU_GPIOA);
   gpio_init(GPIOA,GPIO_MODE_AF_PP,GPIO_OSPEED_10MHZ,GPIO_PIN_9);

   rcu_periph_clock_enable(RCU_USART0);
   usart_deinit(USART0);
   usart_baudrate_set(USART0,115200);
   usart_parity_config(USART0,USART_PM_NONE);
   usart_word_length_set(USART0,USART_WL_8BIT);
   usart_stop_bit_set(USART0,USART_STB_1BIT);
   usart_transmit_config(USART0,USART_TRANSMIT_ENABLE);
   usart_dma_transmit_config(USART0,USART_TRANSMIT_DMA_ENABLE);//重点
   usart_enable(USART0);

   rcu_periph_clock_enable(RCU_DMA0);
   dma_deinit(DMA0,DMA_CH3);

   dma_struct_para_init(&dmaTxCfg);
   dmaTxCfg.periph_addr = USART0+0x04;
dmaTxCfg.periph_width = DMA_PERIPHERAL_WIDTH_8BIT;
dmaTxCfg.periph_inc = DMA_PERIPH_INCREASE_DISABLE;
dmaTxCfg.memory_width = DMA_MEMORY_WIDTH_8BIT;
dmaTxCfg.memory_inc = DMA_MEMORY_INCREASE_ENABLE;
dmaTxCfg.direction = DMA_MEMORY_TO_PERIPHERAL;
dmaTxCfg.priority = DMA_PRIORITY_LOW;

   dma_interrupt_enable(DMA0,DMA_CH3,DMA_INT_FTF);
   nvic_irq_enable(DMA0_Channel3_IRQn,2,2);
   dma_init(DMA0,DMA_CH3,&dmaTxCfg);

}

int main(){

   UsartDmaCfg();
   while(1){
       UsartDmaSend("123",3);
   }


}

外设到内存（接收）

#include "gd32f30x.h"

dma_parameter_struct dmaTxCfg;
dma_parameter_struct dmaRxCfg;

volatile int dmaSending = 0;
void DMA0_Channel3_IRQHandler(){
   if( dma_interrupt_flag_get(DMA0,DMA_CH3,DMA_INT_FLAG_FTF) ){
       dma_interrupt_flag_clear(DMA0,DMA_CH3,DMA_INT_FLAG_FTF);
       dmaSending = 0;
   }
}
void UsartDmaSend(unsigned char* pData, int nLen){
   dmaSending = 1;
   dma_channel_disable(DMA0,DMA_CH3);
   dmaTxCfg.memory_addr = pData;
   dmaTxCfg.number = nLen;
   dma_init(DMA0,DMA_CH3,&dmaTxCfg);
   dma_channel_enable(DMA0,DMA_CH3);
   while( dmaSending );
}
#define RECV_BUF_LEN 128
unsigned char UsartReceiveBuffer[RECV_BUF_LEN]={0};
void DMA0_Channel4_IRQHandler(){
   if( dma_interrupt_flag_get(DMA0,DMA_CH4,DMA_INT_FLAG_FTF) ){
       dma_interrupt_flag_clear(DMA0,DMA_CH4,DMA_INT_FLAG_FTF);

       dma_channel_disable(DMA0,DMA_CH4);
       dma_init(DMA0,DMA_CH4,&dmaRxCfg);
   dma_channel_enable(DMA0,DMA_CH4);//关掉再开启，达到循环接收（或使用循环模式（不推荐））

       UsartDmaSend(UsartReceiveBuffer,RECV_BUF_LEN);//收满128个再发
   }
}
void USART0_IRQHandler(){
   if( usart_interrupt_flag_get(USART0,USART_INT_FLAG_IDLE) ){
       usart_interrupt_flag_clear(USART0,USART_INT_FLAG_IDLE);//不再有数据进来会触发空闲中断
       usart_data_receive(USART0);//触发空闲中断后读一下，否则会一直触发空闲中断

       int n = RECV_BUF_LEN - dma_transfer_number_get(DMA0,DMA_CH4);//从number向下计数

       dma_channel_disable(DMA0,DMA_CH4);
       dma_init(DMA0,DMA_CH4,&dmaRxCfg);
   dma_channel_enable(DMA0,DMA_CH4);

       UsartDmaSend(UsartReceiveBuffer,n);
   }
}
void UsartDmaCfg(){
   rcu_periph_clock_enable(RCU_AF);
   rcu_periph_clock_enable(RCU_GPIOB);
   gpio_init(GPIOB,GPIO_MODE_AF_PP,GPIO_OSPEED_10MHZ,GPIO_PIN_6);
   gpio_init(GPIOB,GPIO_MODE_IPU,GPIO_OSPEED_10MHZ,GPIO_PIN_7);
   gpio_pin_remap_config(GPIO_USART0_REMAP,ENABLE);

   rcu_periph_clock_enable(RCU_USART0);
   usart_deinit(USART0);
   usart_baudrate_set(USART0,115200);
   usart_parity_config(USART0,USART_PM_NONE);
   usart_word_length_set(USART0,USART_WL_8BIT);
   usart_stop_bit_set(USART0,USART_STB_1BIT);
   usart_transmit_config(USART0,USART_TRANSMIT_ENABLE);
   usart_receive_config(USART0,USART_RECEIVE_ENABLE);
   usart_dma_transmit_config(USART0,USART_TRANSMIT_DMA_ENABLE);
   usart_dma_receive_config(USART0,USART_RECEIVE_DMA_ENABLE);
   usart_interrupt_enable(USART0,USART_INT_IDLE);//使能空闲中断
   nvic_irq_enable(USART0_IRQn,2,2);
   usart_enable(USART0);

   rcu_periph_clock_enable(RCU_DMA0);
   dma_deinit(DMA0,DMA_CH3);
   dma_struct_para_init(&dmaTxCfg);
   dmaTxCfg.periph_addr = USART0+0x04;
dmaTxCfg.periph_width = DMA_PERIPHERAL_WIDTH_8BIT;
dmaTxCfg.periph_inc = DMA_PERIPH_INCREASE_DISABLE;
dmaTxCfg.memory_width = DMA_MEMORY_WIDTH_8BIT;
dmaTxCfg.memory_inc = DMA_MEMORY_INCREASE_ENABLE;
dmaTxCfg.direction = DMA_MEMORY_TO_PERIPHERAL;
dmaTxCfg.priority = DMA_PRIORITY_LOW;
   dma_interrupt_enable(DMA0,DMA_CH3,DMA_INT_FTF);
   nvic_irq_enable(DMA0_Channel3_IRQn,0,2);
//由于发送相关的中断服务函数中包含发送函数，会导致发送相关的函数中断无法执行，需将其抢断优先级调高
   dma_init(DMA0,DMA_CH3,&dmaTxCfg);

   dma_deinit(DMA0,DMA_CH4);
   dma_struct_para_init(&dmaRxCfg);
   dmaRxCfg.periph_addr = USART0+0x04;
dmaRxCfg.periph_width = DMA_PERIPHERAL_WIDTH_8BIT;
dmaRxCfg.periph_inc = DMA_PERIPH_INCREASE_DISABLE;
   dmaRxCfg.memory_addr = UsartReceiveBuffer;
dmaRxCfg.memory_width = DMA_MEMORY_WIDTH_8BIT;
dmaRxCfg.memory_inc = DMA_MEMORY_INCREASE_ENABLE;
   dmaRxCfg.number = RECV_BUF_LEN;
dmaRxCfg.direction = DMA_PERIPHERAL_TO_MEMORY;
dmaRxCfg.priority = DMA_PRIORITY_LOW;
   dma_interrupt_enable(DMA0,DMA_CH4,DMA_INT_FTF);
   nvic_irq_enable(DMA0_Channel4_IRQn,2,2);
   dma_init(DMA0,DMA_CH4,&dmaRxCfg);
   dma_channel_enable(DMA0,DMA_CH4);//接收时一开始就要开启使能
}