欢迎来到尧图网

客户服务 关于我们

您的位置：首页 > 文旅 > 旅游 > stm32单片机个人学习笔记12（DMA直接存储器存取）

stm32单片机个人学习笔记12（DMA直接存储器存取）

2024/10/28 8:14:46 来源：https://blog.csdn.net/2302_80867398/article/details/143264900  浏览:  次   关键词：stm32单片机个人学习笔记12（DMA直接存储器存取）

前言

本篇文章属于stm32单片机（以下简称单片机）的学习笔记，来源于B站教学视频。下面是这位up主的视频链接。本文为个人学习笔记，只能做参考，细节方面建议观看视频，肯定受益匪浅。

STM32入门教程-2023版 细致讲解 中文字幕_哔哩哔哩_bilibili

一、DMA

存储器和存储器之间使用软件触发，外设和存储器之间使用硬件触发--比如AD通道的转换，转换完成后再转运 

 存储器映像

 DMA总线来访问外设存储器，内部多个通道实现数据的独立转运，仲裁器用于调度各个通道的转运，AHB从设备用来配置DMA的参数，DMA请求是DMA的触发源

基本结构图 

二、实例一（DMA数据转运） 

MyDMA.c

将DMA使用结构体将所有参数初始化好

调用一次Transfer就转运一次

#include "stm32f10x.h"                  // Device headeruint16_t MyDMA_Size;void MyDMA_Init(uint32_t AddrA, uint32_t AddrB, uint16_t Size)
{RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);MyDMA_Size=Size;DMA_InitTypeDef DMA_InitStructure;DMA_InitStructure.DMA_PeripheralBaseAddr = AddrA;DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Enable;DMA_InitStructure.DMA_MemoryBaseAddr = AddrB;DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;DMA_InitStructure.DMA_MemoryInc	= DMA_MemoryInc_Enable;DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;DMA_InitStructure.DMA_BufferSize = Size;DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;DMA_InitStructure.DMA_M2M = DMA_M2M_Enable;DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;DMA_Init(DMA1_Channel1, &DMA_InitStructure);DMA_Cmd(DMA1_Channel1, DISABLE);
}void MyDMA_Transfer(void)
{DMA_Cmd(DMA1_Channel1, DISABLE);DMA_SetCurrDataCounter(DMA1_Channel1, MyDMA_Size);DMA_Cmd(DMA1_Channel1, ENABLE);while(DMA_GetFlagStatus(DMA1_FLAG_TC1) == RESET);DMA_ClearFlag(DMA1_FLAG_TC1);}

main.c 

#include "stm32f10x.h"                  // Device header
#include "Delay.h"
#include "OLED.h"
#include "MyDMA.h"uint8_t DataA[]={0x01,0x02,0x03,0x04};
uint8_t DataB[]={0,0,0,0};int main(void)
{OLED_Init();MyDMA_Init((uint32_t)DataA,(uint32_t)DataB,4);OLED_ShowString(1,1,"DataA");OLED_ShowString(3,1,"DataB");OLED_ShowHexNum(1,8,(uint32_t)DataA,8);OLED_ShowHexNum(3,8,(uint32_t)DataB,8);OLED_ShowHexNum(2,1,DataA[0],2);OLED_ShowHexNum(2,4,DataA[1],2);OLED_ShowHexNum(2,7,DataA[2],2);OLED_ShowHexNum(2,10,DataA[3],2);OLED_ShowHexNum(4,1,DataB[0],2);OLED_ShowHexNum(4,4,DataB[1],2);OLED_ShowHexNum(4,7,DataB[2],2);OLED_ShowHexNum(4,10,DataB[3],2);Delay_ms(1000);while (1){MyDMA_Transfer();DataA[0]++;DataA[1]++;DataA[2]++;DataA[3]++;OLED_ShowHexNum(2,1,DataA[0],2);OLED_ShowHexNum(2,4,DataA[1],2);OLED_ShowHexNum(2,7,DataA[2],2);OLED_ShowHexNum(2,10,DataA[3],2);OLED_ShowHexNum(4,1,DataB[0],2);OLED_ShowHexNum(4,4,DataB[1],2);OLED_ShowHexNum(4,7,DataB[2],2);OLED_ShowHexNum(4,10,DataB[3],2);Delay_ms(1000);}
}

二、实例二（AD多通道+DMA转运）

AD单次转换，扫描模式且DMA单次转运

 AD.c

#include "stm32f10x.h"                  // Device headeruint16_t AD_Value[4];/*** @brief  AD初始化* @param  无* @retval 无*/
void AD_Init(void)
{//开启时钟RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);//ADC预分频RCC_ADCCLKConfig(RCC_PCLK2_Div6);//GPIO初始化GPIO_InitTypeDef GPIO_InitStructure;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 |GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_Init(GPIOA, &GPIO_InitStructure);//ADC通道选择ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_55Cycles5);ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 2, ADC_SampleTime_55Cycles5);ADC_RegularChannelConfig(ADC1, ADC_Channel_2, 3, ADC_SampleTime_55Cycles5);ADC_RegularChannelConfig(ADC1, ADC_Channel_3, 4, ADC_SampleTime_55Cycles5);//ADC初始化ADC_InitTypeDef ADC_InitStructure;ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;ADC_InitStructure.ADC_ScanConvMode = ENABLE;ADC_InitStructure.ADC_NbrOfChannel = 4;ADC_Init(ADC1, &ADC_InitStructure);//DMA初始化DMA_InitTypeDef DMA_InitStructure;DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&ADC1->DR;DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)AD_Value;DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;DMA_InitStructure.DMA_MemoryInc	= DMA_MemoryInc_Enable;DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;DMA_InitStructure.DMA_BufferSize = 4;DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;DMA_Init(DMA1_Channel1, &DMA_InitStructure);DMA_Cmd(DMA1_Channel1, ENABLE);//开启ADC到DMA的输出ADC_DMACmd(ADC1, ENABLE);//开启ADC电源ADC_Cmd(ADC1, ENABLE);//ADC校准ADC_ResetCalibration(ADC1);while(ADC_GetResetCalibrationStatus(ADC1));ADC_StartCalibration(ADC1);while(ADC_GetCalibrationStatus(ADC1));}/*** @brief  AD获取转换值且DMA开始转运* @param  无* @retval 转换得到的值*/
void AD_Getvalue(void)
{DMA_Cmd(DMA1_Channel1, DISABLE);DMA_SetCurrDataCounter(DMA1_Channel1, 4);DMA_Cmd(DMA1_Channel1, ENABLE);ADC_SoftwareStartConvCmd(ADC1, ENABLE);while(DMA_GetFlagStatus(DMA1_FLAG_TC1) == RESET);DMA_ClearFlag(DMA1_FLAG_TC1);
}

 main.c

#include "stm32f10x.h"                  // Device header
#include "Delay.h"
#include "OLED.h"
#include "AD.h"int main(void)
{OLED_Init();AD_Init();OLED_ShowString(1,1,"AD0:");OLED_ShowString(2,1,"AD1:");OLED_ShowString(3,1,"AD2:");OLED_ShowString(4,1,"AD3:");while (1){AD_GetValue();OLED_ShowNum(1,5,AD_Value[0],4);OLED_ShowNum(2,5,AD_Value[1],4);OLED_ShowNum(3,5,AD_Value[2],4);OLED_ShowNum(4,5,AD_Value[3],4);Delay_ms(100);}
}

 

AD多次转换，扫描模式且DMA连续转运  

AD.c 

#include "stm32f10x.h"                  // Device headeruint16_t AD_Value[4];/*** @brief  AD初始化* @param  无* @retval 无*/
void AD_Init(void)
{//开启时钟RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);//ADC预分频RCC_ADCCLKConfig(RCC_PCLK2_Div6);//GPIO初始化GPIO_InitTypeDef GPIO_InitStructure;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 |GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_Init(GPIOA, &GPIO_InitStructure);//ADC通道选择ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_55Cycles5);ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 2, ADC_SampleTime_55Cycles5);ADC_RegularChannelConfig(ADC1, ADC_Channel_2, 3, ADC_SampleTime_55Cycles5);ADC_RegularChannelConfig(ADC1, ADC_Channel_3, 4, ADC_SampleTime_55Cycles5);//ADC初始化ADC_InitTypeDef ADC_InitStructure;ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;ADC_InitStructure.ADC_ScanConvMode = ENABLE;ADC_InitStructure.ADC_NbrOfChannel = 4;ADC_Init(ADC1, &ADC_InitStructure);//DMA初始化DMA_InitTypeDef DMA_InitStructure;DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&ADC1->DR;DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)AD_Value;DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;DMA_InitStructure.DMA_MemoryInc	= DMA_MemoryInc_Enable;DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;DMA_InitStructure.DMA_BufferSize = 4;DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;DMA_Init(DMA1_Channel1, &DMA_InitStructure);DMA_Cmd(DMA1_Channel1, ENABLE);//开启ADC到DMA的输出ADC_DMACmd(ADC1, ENABLE);//开启ADC电源ADC_Cmd(ADC1, ENABLE);//ADC校准ADC_ResetCalibration(ADC1);while(ADC_GetResetCalibrationStatus(ADC1));ADC_StartCalibration(ADC1);while(ADC_GetCalibrationStatus(ADC1));ADC_SoftwareStartConvCmd(ADC1, ENABLE);
}

 main.c

#include "stm32f10x.h"                  // Device header
#include "Delay.h"
#include "OLED.h"
#include "AD.h"int main(void)
{OLED_Init();AD_Init();OLED_ShowString(1,1,"AD0:");OLED_ShowString(2,1,"AD1:");OLED_ShowString(3,1,"AD2:");OLED_ShowString(4,1,"AD3:");while (1){OLED_ShowNum(1,5,AD_Value[0],4);OLED_ShowNum(2,5,AD_Value[1],4);OLED_ShowNum(3,5,AD_Value[2],4);OLED_ShowNum(4,5,AD_Value[3],4);Delay_ms(100);}
}

 

版权声明:

本网仅为发布的内容提供存储空间，不对发表、转载的内容提供任何形式的保证。凡本网注明“来源：XXX网络”的作品，均转载自其它媒体，著作权归作者所有，商业转载请联系作者获得授权，非商业转载请注明出处。

我们尊重并感谢每一位作者，均已注明文章来源和作者。如因作品内容、版权或其它问题，请及时与我们联系，联系邮箱：809451989@qq.com，投稿邮箱：809451989@qq.com

相关资讯

热文排行

最新新闻

推荐新闻

热搜词

第一周训练 带你用Go实现二维码小游戏（上） SpringBoot整合API接口做快递智能识别 学习记录：js算法（七十七）：合并若干三元组以形成目标三元组 Linux：指令再认识 【C++】—— 模板进阶