萌新一个,看了原子哥串口+dma的代码,想自己弄一个dma控制pwm占空比的代码,但是失败了,我贴一下配置的代码,希望大佬们指点指点。万分感谢
(pa0引脚TIM2通道1做pwm输出,看了手册得开dma1数据流5通道3)
DMA配置:
void MYDMA_Config(DMA_Stream_TypeDef *DMA_Streamx,u32 chx,u32 par,u32 mar,u16 ndtr)
{
DMA_InitTypeDef DMA_InitStructure;
if((u32)DMA_Streamx>(u32)DMA2)
{
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2,ENABLE);
}else
{
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1,ENABLE);
}
DMA_DeInit(DMA_Streamx);
while (DMA_GetCmdStatus(DMA_Streamx) != DISABLE){}
DMA_InitStructure.DMA_Channel = chx;
DMA_InitStructure.DMA_PeripheralBaseAddr = par;
DMA_InitStructure.DMA_Memory0BaseAddr = mar;
DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;
DMA_InitStructure.DMA_BufferSize = ndtr;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;
DMA_InitStructure.DMA_MemoryDataSize = DMA_PeripheralDataSize_Word;
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
DMA_Init(DMA_Streamx, &DMA_InitStructure);
TIM_DMACmd(TIM2, TIM_DMA_Update, ENABLE);
DMA_Cmd(DMA_Streamx, DISABLE);
}
hhhh都是原子哥的代码。
TIM2配置:
void TIM2_PWM_Init(u32 arr,u32 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
GPIO_PinAFConfig(GPIOA,GPIO_PinSource0,GPIO_AF_TIM2);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA,&GPIO_InitStructure);
TIM_TimeBaseStructure.TIM_Prescaler=psc;
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_Period=arr;
TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1;
TIM_TimeBaseInit(TIM2,&TIM_TimeBaseStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1Init(TIM2, &TIM_OCInitStructure);
TIM_OC1PreloadConfig(TIM2, TIM_OCPreload_Enable);
TIM_ARRPreloadConfig(TIM2,ENABLE);
TIM_Cmd(TIM2, ENABLE);
}
下面是mian.c的代码:
uint32_t dd[3]={40,20,10};
int main(void)
{
delay_init(168);
TIM2_PWM_Init(52-1,2-1);
MYDMA_Config(DMA1_Stream5,DMA_Channel_3,(uint32_t)&(TIM2->CCR1),(uint32_t)dd,3);
while(1)
{
while (DMA_GetCmdStatus(DMA_Streamx) != DISABLE){}
DMA_SetCurrDataCounter(DMA1_Stream5,3);
DMA_Cmd(DMA_Streamx, ENABLE);
TIM_Cmd(TIM2, ENABLE);
while(1)
{
if(DMA_GetFlagStatus(DMA1_Stream5,DMA_FLAG_TCIF5)!=RESET)
{
TIM_Cmd(TIM2, DISABLE);
DMA_Cmd(DMA_Streamx, DISABLE);
DMA_ClearFlag(DMA1_Stream5,DMA_FLAG_TCIF5);
break;
}
}
delay_ms(10);
}
}
用逻辑分析仪抓不到波形,debug发现卡死在 if(DMA_GetFlagStatus(DMA1_Stream5,DMA_FLAG_TCIF5)!=RESET)这里了。(自己还写过一个dma+spi的代码,debug过不会卡在这里)
友情提示: 此问题已得到解决,问题已经关闭,关闭后问题禁止继续编辑,回答。
哇谢谢大佬。
1.EMMMMM工程的代码比较乱这是我复制过来复制错的,原工程代码没错DMA_Streamx是DMA1_Stream5。
2.每次开启之前重新设置传输个数了:while (DMA_GetCmdStatus(DMA_Streamx) != DISABLE){}
DMA_SetCurrDataCounter(DMA1_Stream5,3);
3.我单独做pwm可以产生波形但是加了dma以后甚至连波形都没有了,卡在了if(DMA_GetFlagStatus(DMA1_Stream5,DMA_FLAG_TCIF5)!=RESET)。dma传输数据比较快所以每次我都是先开启dma再开定时器。
4.这个我不知道有没有影响。我单独做pwm配置好定时器以后测试过 TIM_Cmd(TIM2, ENABLE);
delay_ms(50);
TIM_Cmd(TIM2, DISABLE);
delay_ms(50);
可以产生预定要求的波形,因此我觉得配置好定时器以后关闭在打开不影响。我的目的就是先配置好定时器再通过dma改变占空比(改变CCR1的寄存器值)
手册也是反反复复在看的是在没辙才来发帖子!
谢谢大佬。
一周热门 更多>