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stm32,DMA采集一个AD数据,并通过DMA向串口发送

stm32,DMA采集一个AD数据,并通过DMA向串口发送
stm32,DMA采集一个AD数据,并通过DMA向串口发送

#include

#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_GetConversionV alue(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_Received1%1000000000/100000000 + 0x30);

ADC_Received2[2]=(ADC_Received1%1000000000%100000000/10000000 + 0x30);

ADC_Received2[3]=(ADC_Received1%1000000000%100000000%10000000/1000000 + 0x30);

ADC_Received2[4]=(ADC_Received1%1000000000%100000000%10000000%1000000/100000 + 0x30);

ADC_Received2[5]=(ADC_Received1%1000000000%100000000%10000000%1000000%10000 0/10000 + 0x30);

ADC_Received2[6]=(ADC_Received1%1000000000%100000000%10000000%1000000%10000 0%10000/1000 + 0x30);

ADC_Received2[7]=(ADC_Received1%1000000000%100000000%10000000%1000000%10000 0%10000%1000/100 + 0x30);

ADC_Received2[8]=(ADC_Received1%1000000000%100000000%10000000%1000000%10000 0%10000%1000%100/10 + 0x30);

ADC_Received2[9]=(ADC_Received1%10 + 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("\r\n v = %f V \r\n",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("\r\n V = %fv\r\n",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_https://www.sodocs.net/doc/407094711.html,ART_BaudRate = 115200;

USART_https://www.sodocs.net/doc/407094711.html,ART_WordLength = USART_WordLength_8b;

USART_https://www.sodocs.net/doc/407094711.html,ART_StopBits = USART_StopBits_1;

USART_https://www.sodocs.net/doc/407094711.html,ART_Parity = USART_Parity_No ;

USART_https://www.sodocs.net/doc/407094711.html,ART_HardwareFlowControl = USART_HardwareFlowControl_None;

USART_https://www.sodocs.net/doc/407094711.html,ART_Mode = USART_Mode_Rx | USART_Mode_Tx;

USART_Init(USART1, &USART_InitStructure);

USART_Cmd(USART1, ENABLE);

}

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