2019年04月23日 | STM32学习笔记-ADC采集-串口2发送至上位机

串口2的配置(一根杜邦线不行纠结了半天)

void USART2_Initialise( u32 bound )

{

    GPIO_InitTypeDef GPIO_InitStructure;

    NVIC_InitTypeDef NVIC_InitStructure;

    USART_InitTypeDef USART_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_AFIO,ENABLE);

/* Enable the USART2 Pins Software Remapping */

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA , ENABLE);

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE); 

    /* Configure USART2 Rx (PA.03) as input floating */

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;    

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

    GPIO_Init(GPIOA, &GPIO_InitStructure);

    /* Configure USART2 Tx (PA.02) as alternate function push-pull */

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;

    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

    GPIO_Init(GPIOA, &GPIO_InitStructure);

    /* Enable the USART2 Interrupt */

    NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;

    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;

    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;

    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

    NVIC_Init(&NVIC_InitStructure);    

    USART_InitStructure.USART_BaudRate = bound;                

    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(USART2, &USART_InitStructure);

    USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);

    USART_Cmd(USART2, ENABLE);

}

原理与串口一相同,只是io口不同,所在总线不同

ADC1的配置

void  Adc_Init(void)

{

ADC_InitTypeDef ADC_InitStructure; 

GPIO_InitTypeDef GPIO_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA |RCC_APB2Periph_ADC1, ENABLE );

RCC_ADCCLKConfig(RCC_PCLK2_Div6);  

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;

GPIO_Init(GPIOA, &GPIO_InitStructure);

ADC_DeInit(ADC1);  

ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;

ADC_InitStructure.ADC_ScanConvMode = DISABLE;

ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;

ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;

ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;

ADC_InitStructure.ADC_NbrOfChannel = 1;

ADC_Init(ADC1, &ADC_InitStructure);

        ADC_Cmd(ADC1, ENABLE);

ADC_ResetCalibration(ADC1);

while(ADC_GetResetCalibrationStatus(ADC1));

ADC_StartCalibration(ADC1);

while(ADC_GetCalibrationStatus(ADC1));

}   

io口配置与点亮第一个led灯类似,模拟输入模式即可

与配置其他功能类似,ADC的配置也是一个结构体变量传入参数

ADC_InitTypeDef结构体变量名

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA |RCC_APB2Periph_ADC1, ENABLE );

使能ADC1通道时钟

RCC_ADCCLKConfig(RCC_PCLK2_Div6); 设置ADC分频因子 72/6=12M

ADC_DeInit(ADC1);复位ADC

ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;ADC工作模式ADC1和ADC2工作在独立模式

ADC_InitStructure.ADC_ScanConvMode = DISABLE;模数转换在单通道模式

ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;模式转换工作在单次转换模式

ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;软件触发

ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;ADC数据对齐方式

ADC_InitStructure.ADC_NbrOfChannel = 1;顺序进行转换的ADC通道数

ADC_Init(ADC1, &ADC_InitStructure);传入结构体地址,初始化ADC

 ADC_Cmd(ADC1, ENABLE);使能ADC

ADC_ResetCalibration(ADC1);使能复位校准

while(ADC_GetResetCalibrationStatus(ADC1));等待复位校准结束

ADC_StartCalibration(ADC1);开启AD校准

while(ADC_GetCalibrationStatus(ADC1));等待校准结束

获取ADC函数传入参数adc通道号

u16 Get_Adc(u8 ch)   

{

ADC_RegularChannelConfig(ADC1, ch, 1, ADC_SampleTime_239Cycles5 );       

ADC_SoftwareStartConvCmd(ADC1, ENABLE);

while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC ));

return ADC_GetConversionValue(ADC1);

}

ADC_RegularChannelConfig(ADC1, ch, 1, ADC_SampleTime_239Cycles5 );ADC1,通道1,采样时间为239.5个周期

ADC_SoftwareStartConvCmd(ADC1, ENABLE);使能指定ADC1软件转换启动功能

while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC ));等待转换结束

return ADC_GetConversionValue(ADC1);返回最后一次ADC的转换结果

ADC通道对应io口如图

         p=adcx;

p=(3.3/4096)*p;

         p=p*10000;

         v=(int)p;

         USART_SendData(USART2,0x76);

while(USART_GetFlagStatus(USART2,USART_FLAG_TC)!=SET);

USART_SendData(USART2,0x3D);

         while(USART_GetFlagStatus(USART2,USART_FLAG_TC)!=SET);

USART_SendData(USART2,(48+v/10000));

while(USART_GetFlagStatus(USART2,USART_FLAG_TC)!=SET);

USART_SendData(USART2,0x2E);

while(USART_GetFlagStatus(USART2,USART_FLAG_TC)!=SET);

USART_SendData(USART2,(48+v%10000/1000));

while(USART_GetFlagStatus(USART2,USART_FLAG_TC)!=SET);

USART_SendData(USART2,(48+v%10000%1000/100));

while(USART_GetFlagStatus(USART2,USART_FLAG_TC)!=SET);

USART_SendData(USART2,(48+v%10000%1000%100/10));

while(USART_GetFlagStatus(USART2,USART_FLAG_TC)!=SET);

USART_SendData(USART2,(48+v%10000%1000%100%10));

while(USART_GetFlagStatus(USART2,USART_FLAG_TC)!=SET);

USART_SendData(USART2,0x0A);

while(USART_GetFlagStatus(USART2,USART_FLAG_TC)!=SET); 

采集adc以ASCII方式发送给上位机

while(USART_GetFlagStatus(USART2,USART_FLAG_TC)!=SET);等待发送完成