I want to use TIM+DMA+DAC conversion for stm32F4. Can someone help me find out what is wrong with the program?

shijizai

I want to use TIM+DMA+DAC conversion for stm32F4. Can someone help me find out what is wrong with the program? [Copy link]

I want to use TIM+DMA+DAC conversion for stm32F4. Can someone help me find out what's wrong with the program? The oscilloscope can't display the waveform. This is the main function #include "dac.h" #include "sys.h" #include "delay.h" #include "led.h" u16 Sine12bit[32] = { 2047, 2447, 2831, 3185, 3498, 3750, 3939, 4056, 4095, 4056, 3939, 3750, 3495, 3185, 2831, 2447, 2047, 1647, 1263, 909, 599, 344, 155, 38, 0, 38, 155, 344, 599, 909, 1263, 1647 }; int main(void) { GPIO_InitTypeDef GPIO_InitStructure; RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE); RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE); RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_Init(GPIOA, &GPIO_InitStructure); TIM6_Config(5000-1,840-1); delay_init(168); while (1) { DAC_DeInit(); DAC_Ch2_SineWaveConfig(); // DAC_SetChannel2Data(DAC_Align_12b_R, 100); // DAC_SetChannel2Data(DAC_Align_12b_R, 3000); } } This is the function of DAC+TIM+DMA #include "dac.h" #include "sys.h" #include "led.h" extern u16 Sine12bit[32]; void TIM6_Config(u16 arr, u16 psc) { TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM6, ENABLE); TIM_TimeBaseStructInit(&TIM_TimeBaseStructure); TIM_TimeBaseStructure.TIM_Period = arr; TIM_TimeBaseStructure.TIM_Prescaler = psc; TIM_TimeBaseStructure.TIM_ClockDivision = 0; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseInit(TIM6, &TIM_TimeBaseStructure); TIM_SelectOutputTrigger(TIM6, TIM_TRGOSource_Update); TIM_Cmd(TIM6, ENABLE); } void DAC_Ch2_SineWaveConfig(void) { DMA_InitTypeDef DMA_InitStructure; DAC_InitTypeDef DAC_InitStructure; DMA_DeInit(DMA1_Stream6); DMA_InitStructure.DMA_Channel = DMA_Channel_7; DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&DAC->DHR12R2; DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&Sine12bit; DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral; DMA_InitStructure.DMA_BufferSize = 32; DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte; DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; DMA_InitStructure.DMA_Priority = DMA_Priority_High; 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(DMA1_Stream6, &DMA_InitStructure); DMA_Cmd(DMA1_Stream6, ENABLE); DAC_InitStructure.DAC_Trigger = DAC_Trigger_T6_TRGO;
//    DAC_InitStructure.DAC_Trigger = DAC_Trigger_None;
  DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;
  DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Disable;
    DAC_InitStructure.DAC_LFSRUnmask_TriangleAmplitude = DAC_LFSRUnmask_Bit0;
  DAC_Init(DAC_Channel_2, &DAC_InitStructure);

  DAC_Cmd(DAC_Channel_2, ENABLE);

  DAC_DMACmd(DAC_Channel_2, ENABLE);
   
//    DAC_SetChannel2Data(DAC_Align_12b_R,0);
   
}
这个是.h文件
#ifndef __dac_H
#define __dac_H
#include "sys.h"

void TIM6_Config(u16 arr, u16 psc);
void DAC_Ch2_SineWaveConfig(void);

#endif
期待大神。。。

huo_hu

There is no need to repeat DAC_DeInit(); Also, if you have TIM, you don't need DMA, just one will do.

shijizai

huo_hu posted on 2018-7-25 18:10 There is no need to repeat DAC_DeInit(); In addition, if there is TIM, there is no need for DMA, just one is enough.

I understand the first sentence, but not the second one. TIM controls the trigger time, and DMA controls the transmission. There is no overlap in the functions of the two. Why is it enough to have only one?

littleshrimp

The official has ready-made code for you to learn about

shijizai

littleshrimp posted on 2018-7-25 21:50 The official has ready-made code, you can learn about it

Well, I'll look for it

huo_hu

Shijizai posted on 2018-7-25 18:43 I understand the first sentence, but not the second one. TIM controls the trigger time, and DMA controls the transmission. There is no overlap between the two functions. Why...

Yes, I read it wrong. DAC can

shijizai

huo_hu posted on 2018-7-26 16:57 Yes, I read it wrong. DAC is OK

Yes

666liuliuliu

Is the problem solved?

shijizai

666liuliuliu posted on 2019-4-23 09:43 Is the problem solved?

It is solved, but it is a bit long ago. I will take some time to think about it and post the solution on this post

changming789

AFIO clock is not turned on