这是以前学32的时候写的，那时候学了32之后感觉32真是太强大了，比51强的没影。关于dma网上有许多的资料，关于dma采集ad网上也有很多。亲们搜搜，这里只贴代码了，其实我也想详详细细地叙述一番，但是自己本身打字就慢，还有好多事情要做！代码是我亲自都在板子上测试过的，，当然粘贴/复制过去可能也不会尽如人意，知识这东西总是有许多道不清说不明的东西在里头，往往总是不经一番彻骨寒，哪得梅花扑鼻香。推荐一本书吧！这是野火出的。
这本书自从在图书馆借来就从来没有再放回去，总是在续借。像是在打广告了
代码语言：javascript复制#include <stm32f10x.h>
#include "ADC1.h"
#include "DMA1.h"
#include "USART1.h"
#include "time.h"
#include "stdio.h"
extern uint32_t SendBuff;
float ADC_Received;
uint32_t ADC_Received1;
uint8_t ADC_Received2[11];
//printf函数重新定向，方便在程序中使用
int fputc(int ch, FILE *f)
{
USART_SendData(USART1, (unsigned char) ch);
while (!(USART1->SR & USART_FLAG_TXE));
return (ch);
}
void usart_putchar(uint8_t ch)
{
USART_SendData(USART1,ch);
while(USART_GetFlagStatus(USART1,USART_FLAG_TXE) == RESET);
}
int main()
{
ADC1_Config();
DMA_Config();
USART1_Config();
while(1)
{
// ADC_Received = (float)ADC_GetConversionValue(ADC1)*3.3/4069;
// ADC_Received1 = ADC_Received * 1000000000;
ADC_Received = (float)SendBuff*3.3/4069;
ADC_Received1 = ADC_Received * 1000000000;
ADC_Received2[0]=(ADC_Received1/1000000000 0x30);
//usart_putchar(0x2e);
ADC_Received2[1]=(ADC_Received100000000/100000000 0x30);
ADC_Received2[2]=(ADC_Received1000000000000000/10000000 0x30);
ADC_Received2[3]=(ADC_Received1000000000000000000000/1000000 0x30);
ADC_Received2[4]=(ADC_Received100000000000000000000000000/100000 0x30);
ADC_Received2[5]=(ADC_Received1000000000000000000000000000000/10000 0x30);
ADC_Received2[6]=(ADC_Received1000000000000000000000000000000000/1000 0x30);
ADC_Received2[7]=(ADC_Received100000000000000000000000000000000000/100 0x30);
ADC_Received2[8]=(ADC_Received1000000000000000000000000000000000000/10 0x30);
ADC_Received2[9]=(ADC_Received1 0x30);
ADC_Received2[10]=0x0d;
USART_DMACmd(USART1, USART_DMAReq_Tx, ENABLE);
// delay_ms(1000);
// USART_DMACmd(USART1, USART_DMAReq_Tx, DISABLE);
// delay_ms(1000);
// ADC_Received = (float) SendBuff/4069*3.3;
// ADC_Received = (u16)ADC1 -> DR;
// ADC_Received = (float)ADC_Received/4069*3.3;
// printf("rn v = %f V rn",ADC_Received);
// while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC ));
// usart_putchar('r');
// usart_putchar('n');
// usart_putchar(0x0d);
// usart_putchar(0x0a);
// printf("r");
// printf("n");
// printf("rn V = %fvrn",ADC_Received);
}
}
#include "ADC1.h"
void ADC1_Config(void)
{
ADC_InitTypeDef ADC_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
ADC1_Gpio_Config();
ADC_DeInit(ADC1); //复位 ADC1,将外设 ADC1 的全部寄存器重设为缺省值
// ADC1 配置
ADC_InitStructure.ADC_Mode = ADC_Mode_Independent; //ADC1工作在独立模式
ADC_InitStructure.ADC_ScanConvMode = ENABLE;//使能扫描
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;;//ADC转换工作在连续模式
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;//由软件控制转换
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;//转换数据右对齐
ADC_InitStructure.ADC_NbrOfChannel = 1;//转换通道为通道1
ADC_Init(ADC1, &ADC_InitStructure); //初始化ADC
//ADC1选择信道0,顺续等级1,采样时间239.5个周期
ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_28Cycles5);
//打开ADC1
ADC_Cmd(ADC1, ENABLE);
//重置ADC1校准寄存器
ADC_ResetCalibration(ADC1);
//等待ADC1校准重置完成
while(ADC_GetResetCalibrationStatus(ADC1));
//开始ADC1校准
ADC_StartCalibration(ADC1);
//等待ADC1校准完成
while(ADC_GetCalibrationStatus(ADC1));
//使能ADC1软件开始转换
ADC_SoftwareStartConvCmd(ADC1, ENABLE);
//配置ADC时钟=PCLK2 1/6 12MHz
RCC_ADCCLKConfig(RCC_PCLK2_Div6);
//使能ADC1模块DMA
ADC_DMACmd(ADC1, ENABLE);
}
static void ADC1_Gpio_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_Init(GPIOA , &GPIO_InitStructure);
}
#include "DMA1.h"
/* 其他函数里 USART_DMACmd(USART1, USART_DMAReq_Tx, ENABLE); */
uint32_t SendBuff;
extern float ADC_Received;
extern uint8_t ADC_Received2[11];
//描述 ：DMA 串口的初始化配置
void DMA_Config(void)
{
//初始化结构体
DMA_InitTypeDef DMA_InitStructure;
//开启DMA时钟
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
//配置DMA中断
NVIC_Config();
//设置DMA源：地址
DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)&ADC1 -> DR;
//*内存地址(要传输的变量的指针)
DMA_InitStructure.DMA_MemoryBaseAddr = (u32)&SendBuff;
//外设作为数据传输的来源
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
//指定 DMA 通道的 DMA 缓存的大小，单位为数据单位。
DMA_InitStructure.DMA_BufferSize = 1;
//*外设地址不增
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
//*内存地址不增
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Disable;
//*外设数据单位数据宽度为 16 位
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
//*内存数据单位数据宽度为 16 位
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
//*DMA模式：一次传输/循环
// DMA_Mode_Circular 工作在循环缓存模式
// DMA_Mode_Normal 工作在正常缓存模式
// DMA_InitStructure.DMA_Mode = DMA_Mode_Normal ;
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
//*优先级：高
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
//*禁止内存到内存的传输
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
//*配置DMA1的1通道
DMA_Init(DMA1_Channel1, &DMA_InitStructure);
//使能DMA
DMA_Cmd (DMA1_Channel1,ENABLE);
//配置DMA发送完成后产生中断
// DMA_ITConfig(DMA1_Channel1,DMA_IT_TC,ENABLE);
//****************************************************///
//****************************************************///
//****************************************************///
//设置DMA源：地址
DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)&USART1 -> DR;
//*内存地址(要传输的变量的指针)
DMA_InitStructure.DMA_MemoryBaseAddr = (u32)ADC_Received2;
//外设作为数据传输的目的地
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
//指定 DMA 通道的 DMA 缓存的大小，单位为数据单位。
DMA_InitStructure.DMA_BufferSize = 11;
//*外设地址不增
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
//*内存地址不增
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
//*外设数据单位数据宽度为 16 位
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
//*内存数据单位数据宽度为 16 位
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
//*DMA模式：一次传输/循环
// DMA_Mode_Circular 工作在循环缓存模式
// DMA_Mode_Normal 工作在正常缓存模式
// DMA_InitStructure.DMA_Mode = DMA_Mode_Normal ;
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
//*优先级：中
DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;
//*禁止内存到内存的传输
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
//*配置DMA1的4通道
DMA_Init(DMA1_Channel4, &DMA_InitStructure);
//使能DMA
DMA_Cmd (DMA1_Channel4,ENABLE);
//配置DMA发送完成后产生中断
// DMA_ITConfig(DMA1_Channel1,DMA_IT_TC,ENABLE);
}
#include "time.h"
/****************
延时多少个 1/72 us
****************/
void delay_1_72us(uint32_t time)
{
SysTick -> LOAD = (u32) time; //定时器赋初值
SysTick -> CTRL = 0x00000005; //选择72MHz 并 打开定时器
while(!(SysTick -> CTRL & 0x00010000));//等待计数到零
SysTick -> CTRL = 0x00000004;//关闭定时器
}
void delay_ms(u32 time)
{
while(time -- )
{
delay_1_72us(72000);
}
}
#include "USART1.h"
//描述 ：USART1 GPIO 配置,工作模式配置。115200 8-N-1
void USART1_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
// 打开 USART1 的时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE);
// USART1 Tx (PA_9)
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;//复用推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
// USART1 Tx (PA_10)
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* USART1 mode config */
USART_InitStructure.USART_BaudRate = 115200;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No ;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_Init(USART1, &USART_InitStructure);
USART_Cmd(USART1, ENABLE);
}
