stm32,DMA采集一个AD数据，并通过DMA向串口发送

#include #include \#include \#include \#include \#include \

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(\

// while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC ));

// usart_putchar('\\r'); // usart_putchar('\\n');

// usart_putchar(0x0d); // usart_putchar(0x0a);

// printf(\// printf(\

// printf(\ }

}

#include \

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 \

/* 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

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