谁有STM32F051的USART2的例程

只看该作者 · 2014-5-5 20:13

用的青风的例程，USART1是没问题的，但是改成USART2就不行，调了很长时间还是找不到原因。

先贴出USART1的例程吧，接受我用的是中断，发送没用中断。
int main(void)
{
unsigned char i = 3;

USART1_Configuration();

  while (1)
  {
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
UART1_send_byte(i ++);
  }
}

extern void USART1_Configuration(void)//′??ú3?ê??ˉoˉêy
{
GPIO_InitTypeDef  GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;

NVIC_SetPriority(USART1_IRQn, 0); /* (4) */
NVIC_EnableIRQ(USART1_IRQn); /* (5) */

RCC_AHBPeriphClockCmd( RCC_AHBPeriph_GPIOA, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE );

GPIO_PinAFConfig(GPIOA,GPIO_PinSource9,GPIO_AF_1);
GPIO_PinAFConfig(GPIOA,GPIO_PinSource10,GPIO_AF_1);
/*
*  USART1_TX -> PA9 , USART1_RX ->  PA10
*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9|GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);

USART_InitStructure.USART_BaudRate = 115200;//éè??′??ú2¨ì??ê
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//éè??êy?Y??
USART_InitStructure.USART_StopBits = USART_StopBits_1;//éè??í￡?1??
USART_InitStructure.USART_Parity = USART_Parity_No;//éè??D§?é??
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//éè??á÷????
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;//éè??1¤×÷?￡ê?
USART_Init(USART1, &USART_InitStructure); //????è??á11ì?

USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
//USART_ITConfig(USART1, USART_IT_TXE, ENABLE);

USART_Cmd(USART1, ENABLE);//ê1?ü′??ú1
}

extern void UART1_send_byte(uint8_t byte)
{
while(!((USART1->ISR)&(1<<7)));
USART1->TDR=byte;
}

extern volatile uint8_t USART_Data = 0;

extern void USART1_IRQHandler(void)
{
  if((USART1->ISR & USART_ISR_TC) == USART_ISR_TC)
  {
USART1->ICR |= USART_ICR_TCCF;/* clear transfer complete flag */
  }
  else if((USART1->ISR & USART_ISR_RXNE) == USART_ISR_RXNE)
  {
USART_Data = USART1->RDR;/* receive data, clear flag */
  }
  else
  {
NVIC_DisableIRQ(USART1_IRQn);/* Disable USART1_IRQn */
  }
}

上面的代码是可以的，我用仿真器和逻辑分析仪查过，都是没问题的。

但是对着改USART2就是不行，用逻辑分析仪看，TX都没有输出信号。试过做回环测试，发不出数据，自然也不会收到数据，也就进不了接受中断。

int main(void)
{
unsigned char i = 3;

USART2_Configuration();

  while (1)
  {
USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
UART2_send_byte(i ++);
  }
}

extern void USART2_Configuration(void)//′??ú3?ê??ˉoˉêy
{
GPIO_InitTypeDef  GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;

NVIC_SetPriority(USART2_IRQn, 0); /* (4) */
NVIC_EnableIRQ(USART2_IRQn); /* (5) */

RCC_AHBPeriphClockCmd( RCC_AHBPeriph_GPIOA, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE );

GPIO_PinAFConfig(GPIOA,GPIO_PinSource2,GPIO_AF_1);
GPIO_PinAFConfig(GPIOA,GPIO_PinSource3,GPIO_AF_1);
/*
*  USART2_TX -> PA2 , USART2_RX ->  PA3
*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2|GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);

USART_InitStructure.USART_BaudRate = 115200;//éè??′??ú2¨ì??ê
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//éè??êy?Y??
USART_InitStructure.USART_StopBits = USART_StopBits_1;//éè??í￡?1??
USART_InitStructure.USART_Parity = USART_Parity_No;//éè??D§?é??
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//éè??á÷????
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;//éè??1¤×÷?￡ê?
USART_Init(USART2, &USART_InitStructure); //????è??á11ì?

USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
//USART_ITConfig(USART2, USART_IT_TXE, ENABLE);

USART_Cmd(USART2, ENABLE);//ê1?ü′??ú1
}

extern void UART2_send_byte(uint8_t byte)
{
while(!((USART2->ISR)&(1<<7)));
USART2->TDR=byte;
}

extern volatile uint8_t USART_Data = 0;

extern void USART2_IRQHandler(void)
{
  if((USART2->ISR & USART_ISR_TC) == USART_ISR_TC)
  {
USART2->ICR |= USART_ICR_TCCF;/* clear transfer complete flag */
  }
  else if((USART2->ISR & USART_ISR_RXNE) == USART_ISR_RXNE)
  {
USART_Data = USART2->RDR;/* receive data, clear flag */
  }
  else
  {
NVIC_DisableIRQ(USART2_IRQn);/* Disable USART1_IRQn */
  }
}