STM32 DMA内存到内存传输仅触发一次
我正在使用STM32F103,试图使用DMA从一个阵列复制到另一个阵列。传输在第一次工作时,会命中STM32 DMA内存到内存传输仅触发一次,stm32,dma,Stm32,Dma,我正在使用STM32F103,试图使用DMA从一个阵列复制到另一个阵列。传输在第一次工作时,会命中DMA1\u Channel1\u IRQHandler中的断点,但对DMA\u Cmd(DMA1\u Channel1,ENABLE)的后续调用无效,且不会命中断点。未设置错误标志DMA1\U标志TE1。是否有其他需要设置/重置的内容,以便再次运行传输 #include "stm32f10x.h" #define ARRAYSIZE 800 volatile uint32_t status =
DMA1\u Channel1\u IRQHandler
中的断点,但对DMA\u Cmd(DMA1\u Channel1,ENABLE)
的后续调用无效,且不会命中断点。未设置错误标志DMA1\U标志TE1。是否有其他需要设置/重置的内容,以便再次运行传输
#include "stm32f10x.h"
#define ARRAYSIZE 800
volatile uint32_t status = 0;
volatile uint32_t i;
int main(void)
{
uint32_t source[ARRAYSIZE];
uint32_t destination[ARRAYSIZE];
for (i=0; i<ARRAYSIZE;i++)
source[i]=i;
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
DMA_InitTypeDef DMA_InitStructure;
DMA_DeInit(DMA1_Channel1);
DMA_InitStructure.DMA_M2M = DMA_M2M_Enable;
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Enable;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_BufferSize = ARRAYSIZE;
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)source;
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)destination;
DMA_Init(DMA1_Channel1, &DMA_InitStructure);
DMA_ITConfig(DMA1_Channel1, DMA_IT_TC, ENABLE);
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
status = 1;
while (1)
{
if(status == 1)
{
status = 0;
DMA1_Channel1->CNDTR = ARRAYSIZE;
DMA1_Channel1->CPAR = (uint32_t)source;
DMA1_Channel1->CMAR = (uint32_t)destination;
DMA_ClearFlag(DMA1_FLAG_GL1);
DMA_ClearFlag(DMA1_FLAG_TC1);
DMA_Cmd(DMA1_Channel1, DISABLE);
DMA_Cmd(DMA1_Channel1, ENABLE);
}
}
}
void DMA1_Channel1_IRQHandler(void)
{
if(DMA_GetITStatus(DMA1_IT_TC1))
{
status=1;
DMA_ClearITPendingBit(DMA1_IT_GL1);
}
}
#包括“stm32f10x.h”
#定义阵列800
易失性uint32_t状态=0;
挥发性uint32_t i;
内部主(空)
{
uint32_t源[阵列化];
uint32_t目的地[排列];
对于(i=0;iCNDTR=ARRAYSIZE;
DMA1_通道1->CPAR=(uint32_t)源;
DMA1\u信道1->CMAR=(uint32\u t)目的地;
DMA_ClearFlag(DMA1_FLAG_GL1);
DMA_ClearFlag(DMA1_FLAG_TC1);
DMA_Cmd(DMA1_信道1,禁用);
DMA_Cmd(DMA1_信道1,启用);
}
}
}
无效DMA1\U通道1\U IRQHandler(无效)
{
if(DMA_GetITStatus(DMA1_IT_TC1))
{
状态=1;
DMA_ClearITPendingBit(DMA1_IT_GL1);
}
}
在设置其寄存器之前禁用DMA,然后再启用。根据(第287页)DMA_CNDTRx只能在禁用频道时写入。DMA_CMARx也是如此。如果在if块中将状态设置为0,程序将不会第二次进入。您想进行连续、循环DMA传输还是自己启动它?我没有注意到isr中的状态设置,前面评论的第一部分与此无关或者,在设置寄存器之前将DMA_Cmd(DMA1_Channel1,DISABLE);
移动到行中修复了问题,DMA事务按预期连续运行。