F103求助USART3无法工作，MDK仿真能够输出，但板子不能打印-第2页回答 - 平头弟

F103求助USART3无法工作，MDK仿真能够输出，但板子不能打印

2019-07-14 16:00发布

站内问答 / STM32/STM8

12894 18

代码如下：那位大神指点一下啊~

#include "STM32f10x.h"
#include "stdio.h"

void delay(__IO u32 nCount);

int main(void)
{
      /* USART1 config 115200 8-N-1 */
USART3_Config();

printf("   STM32f103 USART1 test");

//USART3_Config();

      while(1)
      {
printf(" TM32f103 USART3 test ");

//       for (;;) {
//}
}


      }


void delay(__IO u32 nCount)
{
      for (; nCount != 0; nCount--);
}

void USART3_Config(void)
{
      GPIO_InitTypeDef GPIO_InitStructure;
      USART_InitTypeDef USART_InitStructure;

      /* config USART3 clock */
      RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3 | RCC_APB2Periph_GPIOB, ENABLE);



      /* USART3 GPIO config */
      /* Configure USART3 Tx (PB.10) as alternate function push-pull */
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_Init(GPIOB, &GPIO_InitStructure);
      /* Configure USART3 Rx (PB.11) as input floating */
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
      GPIO_Init(GPIOB, &GPIO_InitStructure);

/* USART3 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(USART3, &USART_InitStructure);



      /* Ê¹ÄÜ´®¿Ú3½ÓÊÕÖÐ¶Ï */
      USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);

      USART_Cmd(USART3, ENABLE);
}

//ÅäÖÃUSART3½ÓÊÕÖÐ¶Ï
void NVIC_Configuration(void)
{
      NVIC_InitTypeDef NVIC_InitStructure;
      /* Configure the NVIC Preemption Priority Bits */
      NVIC_PriorityGroupConfig(NVIC_PriorityGroup_3);

      /* Enable the USARTy Interrupt */
      NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
      NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
      NVIC_Init(&NVIC_InitStructure);
}

void NVIC_Init(NVIC_InitTypeDef* NVIC_InitStruct)
{
  uint32_t tmppriority = 0x00, tmppre = 0x00, tmpsub = 0x0F;

  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NVIC_InitStruct->NVIC_IRQChannelCmd));
  assert_param(IS_NVIC_PREEMPTION_PRIORITY(NVIC_InitStruct->NVIC_IRQChannelPreemptionPriority));
  assert_param(IS_NVIC_SUB_PRIORITY(NVIC_InitStruct->NVIC_IRQChannelSubPriority));

  if (NVIC_InitStruct->NVIC_IRQChannelCmd != DISABLE)
  {
/* Compute the Corresponding IRQ Priority --------------------------------*/
tmppriority = (0x700 - ((SCB->AIRCR) & (uint32_t)0x700))>> 0x08;
tmppre = (0x4 - tmppriority);
tmpsub = tmpsub >> tmppriority;

tmppriority = (uint32_t)NVIC_InitStruct->NVIC_IRQChannelPreemptionPriority << tmppre;
tmppriority |=  NVIC_InitStruct->NVIC_IRQChannelSubPriority & tmpsub;
tmppriority = tmppriority << 0x04;

NVIC->IP[NVIC_InitStruct->NVIC_IRQChannel] = tmppriority;

/* Enable the Selected IRQ Channels --------------------------------------*/
NVIC->ISER[NVIC_InitStruct->NVIC_IRQChannel >> 0x05] =
   (uint32_t)0x01 << (NVIC_InitStruct->NVIC_IRQChannel & (uint8_t)0x1F);
  }
  else
  {
/* Disable the Selected IRQ Channels -------------------------------------*/
NVIC->ICER[NVIC_InitStruct->NVIC_IRQChannel >> 0x05] =
   (uint32_t)0x01 << (NVIC_InitStruct->NVIC_IRQChannel & (uint8_t)0x1F);
  }
}

#define AIRCR_VECTKEY_MASK ((uint32_t)0x05FA0000)

void NVIC_PriorityGroupConfig(uint32_t NVIC_PriorityGroup)
{
  /* Check the parameters */
  assert_param(IS_NVIC_PRIORITY_GROUP(NVIC_PriorityGroup));

  /* Set the PRIGROUP[10:8] bits according to NVIC_PriorityGroup value */
  SCB->AIRCR = AIRCR_VECTKEY_MASK | NVIC_PriorityGroup;
}

/// ÖØ¶¨Ïòc¿âº¯Êýprintfµ½USART3
int fputc(int ch, FILE *f)
{
            /* ·¢ËÍÒ»¸ö×Ö½ÚÊý¾Ýµ½USART3 */
            USART_SendData(USART3, (uint8_t) ch);

            /* µÈ´ý·¢ËÍÍê±Ï */
            while (USART_GetFlagStatus(USART3, USART_FLAG_TC) == RESET);

            return (ch);
}

/// ÖØ¶¨Ïòc¿âº¯Êýscanfµ½USART3
int fgetc(FILE *f)
{
            /* µÈ´ý´®¿Ú1ÊäÈëÊý¾Ý */
            while (USART_GetFlagStatus(USART3, USART_FLAG_RXNE) == RESET);

            return (int)USART_ReceiveData(USART3);
}
/*********************************************END OF FILE**********************/

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18条回答

1楼-- · 2019-07-15 19:05

如上所述，仿真的时候能够通过，也有打印消息输出，但连上芯片，芯片都没有打印输出。还发现了一个问题，就是仿真的时候如果波特率设置为115200在MDK仿真里面显示的是115384，如果设置为9600，仿真显示结果正常。为什么啊？求指点。

2楼-- · 2019-07-15 23:57

精彩回答 2 元偷偷看……

3楼-- · 2019-07-16 04:59

mosen137 发表于 2018-11-15 19:12
你这个代码哎 :(:(:(

重新整理了一下，在9楼，10楼有进一步的描述，麻烦帮我看一下呗。

醉狼工作室

4楼-- · 2019-07-16 08:42

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
抢占优先级设为最高级是否合适，高低一些试试。

谦谦三君子

5楼-- · 2019-07-16 11:24

确定单片机是否工作？比如用IO口先控制个LED亮灭。

晕了，我也是瞎说，既然能下载程序，那么单片机应该是正常工作的...

6楼-- · 2019-07-16 14:34

程序没有错，是硬件连接上的问题。能用了。

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