为什么串口没有接收到数据？

1599064432 · 发表于 2019-3-23 14:46:37

我用的是STM32F030RCT6芯片，usart2接收ADC电压，想用usart3发送到串口，为什么串口没接收到？求大神告知！

1599064432 · 发表于 2019-3-23 14:53:57

#include "NTCtp.h"
#include "stdio.h"
#include "math.h"
#include "timer.h"
#include "usart.h"

uint32_t Resultvolt;

void NTCtp_config(void)
{
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA,ENABLE);
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1,ENABLE);

  SysTick_Config_Init();
  NTCtp_gpio_config();
  NTCtp_usart_config();
  NTCtp_nvic_config();
  usart_release_gpio_int();
  adc_config();
}

void NTCtp_gpio_config(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;    //采集电压
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_Level_3;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;       //串口2
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_Init(GPIOA,&GPIO_InitStructure);

  GPIO_PinAFConfig(GPIOA, GPIO_PinSource3, GPIO_AF_1);
}

void NTCtp_usart_config(void)
{
  USART_InitTypeDef USART_InitStructure;

  USART_InitStructure.USART_BaudRate = 9600;       /*波特率*/
  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; /*流控*/
  USART_InitStructure.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;
  USART_InitStructure.USART_WordLength = USART_WordLength_8b; /*数据位，8*/
  USART_InitStructure.USART_Parity = USART_Parity_No;          /*校验位，n*/
  USART_InitStructure.USART_StopBits = USART_StopBits_1;       /*停止位，1*/
  USART_Init(USART2,&USART_InitStructure);

  USART_ClearFlag(USART2,USART_FLAG_TC);                   //清除发送完成标志位
  USART_Cmd(USART2,ENABLE);                               //使能串口3

  USART_ITConfig(USART2,USART_IT_RXNE,ENABLE);
}

void NTCtp_nvic_config(void)
{
  NVIC_InitTypeDef NVIC_InitStructure;

  NVIC_InitStructure.NVIC_IRQChannelPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
}

int fputc(int ch, FILE *f)                                  //IAR重定向printf函数
{
  //while (USART_GetFlagStatus(USART3,USART_FLAG_TC)  ==  RESET )
  while (USART_GetFlagStatus(USART3,USART_FLAG_TXE)  ==  RESET )
  {

  }
  USART_SendData(USART3,(uint8_t) ch);
  return ch;
}

void adc_config(void)
{
  ADC_DeInit(ADC1);                   //初始化
  ADC_InitTypeDef ADC_InitStructure;
  ADC_StructInit(&ADC_InitStructure);

  ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;                            //转换使能
  ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;                      //右对齐
  ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
  ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;                      //12位分辨率
  ADC_InitStructure.ADC_ScanDirection = ADC_ScanDirection_Upward;             //浏览方向
  ADC_Init(ADC1,&ADC_InitStructure);

  ADC_ChannelConfig(ADC1, ADC_Channel_3, ADC_SampleTime_239_5Cycles); //PA3 通道3 USART2
  ADC_GetCalibrationFactor(ADC1);                                        //校验
  ADC_Cmd(ADC1,ENABLE);

  while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_ADRDY));                   //等待就绪
  ADC_StartOfConversion(ADC1);                                        //启动ADC
}

uint32_t ADC_Check(void)
{
  uint8_t i;

  for(i=0; i<2; i++)
  {
while(ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC) == RESET);
Resultvolt = (uint32_t) ADC_GetConversionValue(ADC1);
  }

  Resultvolt = (Resultvolt*3300)/4096;                //1000倍

  return Resultvolt;
}

void USART2_IRQHandler(void)
{
  if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET)    //判断读寄存器是否有数据
  {
USART_ClearITPendingBit(USART2,USART_IT_RXNE);          //清除发送完成标志位
Resultvolt = USART_ReceiveData(USART2);
  }
}

int main()
{
  static uint32_t  led_timer = 0;
  static uint32_t  usart_timer = 0;
  SysTick_Config_Init();
  led_gpio_init();
  NTCtp_config();

  while(1)
  {

if (tick1ms - led_timer >= 500)
{
   led_timer = tick1ms;
   //GPIO_ResetBits(GPIOB,GPIO_Pin_7);
   GPIOB->ODR ^= GPIO_Pin_7;
}

if (tick1ms - usart_timer >= 500)
{
   usart_timer = tick1ms;
   ADC_Check();                //采集电压
   printf("电压是%d\n",Resultvolt);

}
  }
}

这边是部分代码