UART3的RX脚默认是PB11如何映射到PC11。

vention · 发表于 2016-11-8 16:38:38

本帖最后由 vention 于 2016-11-8 17:42 编辑

IO端口设置只有那里只有 AF_PP，只有推挽输出的映射，但是如果是浮空输入的映射，就没有了，查看寄存器， CRH 寄存器里面，写的也只有推挽输出的AF功能和开漏输出的AF功能，没有浮空输入状态的AF功能啊，而我UART3 RX 是输入的，由PB11需要映射到PC11，请问这样要怎么映射啊。有加入UART3 部分重映射

void uart_init(u32 bound)
{
  GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOC|RCC_APB2Periph_GPIOB, ENABLE);
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);

//USART1_TX GPIOA.9
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //PA.9
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  //USART1_RX    GPIOA.10
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;//PA10
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

   //USART3_  TX  RX
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; //PC.10
   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
   GPIO_Init(GPIOC, &GPIO_InitStructure);//3õê¼»ˉGPIOC.10
   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;//PC11
   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOC, &GPIO_InitStructure);

  NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

  NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
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(USART1, &USART_InitStructure);
  USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
  USART_Cmd(USART1, ENABLE);

  USART_Init(USART3, &USART_InitStructure);
  USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);
  USART_Cmd(USART3, ENABLE);
  GPIO_PinRemapConfig(GPIO_PartialRemap_USART3, ENABLE);
}

void USART1_IRQHandler(void)
{
u8 Res;
#if SYSTEM_SUPPORT_OS //èç1ûSYSTEM_SUPPORT_OSÎaÕæ￡¬ÔòDèòaÖ§3ÖOS.
OSIntEnter();
#endif
if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)  //½óêÕÖD¶Ï(½óêÕμ½μÄêy¾Y±ØDëêÇ0x0d 0x0a½áÎ2)
{
Res =USART_ReceiveData(USART1); //¶áè¡½óêÕμ½μÄêy¾Y

if((USART_RX_STA&0x8000)==0)//½óêÕÎ′íê3é
{
if(USART_RX_STA&0x4000)//½óêÕμ½áË0x0d
{
if(Res!=0x0a)USART_RX_STA=0;//½óêÕ′íÎó,ÖØDÂ¿aê¼
else USART_RX_STA|=0x8000; //½óêÕíê3éáË
}
else //»1Ã»êÕμ½0X0D
{
if(Res==0x0d)USART_RX_STA|=0x4000;

else
{
USART_RX_BUF[USART_RX_STA&0X3FFF]=Res ;
USART_RX_STA++;
if(USART_RX_STA>(USART_REC_LEN-1))USART_RX_STA=0;//½óêÕêy¾Y′íÎó,ÖØDÂ¿aê¼½óêÕ
}
}
}
   }
#if SYSTEM_SUPPORT_OS
OSIntExit();
#endif
}

extern u8 p[3];
void USART3_IRQHandler(void)             //′®¿ú1ÖD¶Ï·tÎñ3ìDò
{
u8 Res;
#if SYSTEM_SUPPORT_OS //èç1ûSYSTEM_SUPPORT_OSÎaÕæ￡¬ÔòDèòaÖ§3ÖOS.
OSIntEnter();
#endif
if(USART_GetITStatus(USART3, USART_IT_RXNE) != RESET)  //½óêÕÖD¶Ï(½óêÕμ½μÄêy¾Y±ØDëêÇ0x0d 0x0a½áÎ2)
{
   Res =USART_ReceiveData(USART3); //¶áè¡½óêÕμ½μÄêy¾Y
   p[1]=Res;

   }
#if SYSTEM_SUPPORT_OS //èç1ûSYSTEM_SUPPORT_OSÎaÕæ￡¬ÔòDèòaÖ§3ÖOS.
OSIntExit();
#endif
}