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分类: LINUX

2015-11-27 15:41:08

原文地址:STM32 UART2程序 作者:sunhenu

USART1程序很多,看看USART2程序。注意红色部分,首先要使能相关端口的时钟。
因为USART2可以映射成不同的端口,所以要端口映射。
结合你自己的开发板,设置正确的映射口.(正点原子的是PA03PA02.)
STM32F103ZE默认的USART2就是PA03PA02,如果配置映射,USART2端口是PD05PD06了。

程序在正点原子开发板SRAM中调试通过,开发环境IAR5.30.

void USART2_Initialise( u32 bound )
{
    GPIO_InitTypeDef GPIO_InitStructure;//I/O¿ú3õê¼»ˉ½á11ìå
    NVIC_InitTypeDef NVIC_InitStructure;//ÖD¶Ï3õê¼»ˉ½á11ìå
    USART_InitTypeDef USART_InitStructure;//′®¿ú3õê¼»ˉ½á11ìå  
    
    /* 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 = 3;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);    
    
    USART_InitStructure.USART_BaudRate = bound;                //ò»°ãéèÖÃÎa9600;
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;//×Ö3¤Îa8λêy¾Y¸ñê½
    USART_InitStructure.USART_StopBits = USART_StopBits_1;     //ò»¸öí£Ö1λ
    USART_InitStructure.USART_Parity = USART_Parity_No;        //ÎTÆæżD£Ñéλ
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//Yá÷¿ØÖÆ
    USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //êÕ·¢Ä£ê½   
    
    USART_Init(USART2, &USART_InitStructure);
    USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
    //USART_ITConfig(USART2, USART_IT_TXE, ENABLE);
    /* Enable USART2 */
    USART_Cmd(USART2, ENABLE);
}

void USART2_IRQHandler(void)  
  
{  
     if(USART_GetFlagStatus(USART2, USART_FLAG_RXNE) == SET)  
      {       
              USART_SendData(USART2, USART_ReceiveData(USART2));             
      }
      
}
该程序功能是返回你发送到串口的数据。

如果你的USART2接到PD端口上面了,要修改程序如下,这里就需要端口映射了,映射寄存器是AFIO控制的,它接在APB2时钟区域,所以下面的红色代码必须要有蓝色代码对端口进行初始化
void USART2_Initialise( u32 bound )
{
    GPIO_InitTypeDef GPIO_InitStructure;//I/O¿ú3õê¼»ˉ½á11ìå
    NVIC_InitTypeDef NVIC_InitStructure;//ÖD¶Ï3õê¼»ˉ½á11ìå
    USART_InitTypeDef USART_InitStructure;//′®¿ú3õê¼»ˉ½á11ìå  
    
    /* Enable the USART2 Pins Software Remapping */
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD ,ENABLE);
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);    
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);
    GPIO_PinRemapConfig(GPIO_Remap_USART2, ENABLE);    
    
    /* Configure USART2 Rx (PD.06) as input floating */
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;    
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(GPIOD, &GPIO_InitStructure);
    
    /* Configure USART2 Tx (PD.05) as alternate function push-pull */
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_Init(GPIOD, &GPIO_InitStructure);
    
    /* Enable the USART2 Interrupt */
    NVIC_InitStructure.NVIC_IRQChannel = USART2_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;//ò»°ãéèÖÃÎa9600;
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;//×Ö3¤Îa8λêy¾Y¸ñê½
    USART_InitStructure.USART_StopBits = USART_StopBits_1;//ò»¸öí£Ö1λ
    USART_InitStructure.USART_Parity = USART_Parity_No;//ÎTÆæżD£Ñéλ
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//¾Yá÷¿ØÖÆ
    USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //êÕ·¢Ä£ê½   
    
    USART_Init(USART2, &USART_InitStructure);
    USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
    //USART_ITConfig(USART2, USART_IT_TXE, ENABLE);
    /* Enable USART2 */
    USART_Cmd(USART2, ENABLE);
}

void USART2_IRQHandler(void)  
  
{  
     if(USART_GetFlagStatus(USART2, USART_FLAG_RXNE) == SET)  
      {       
              USART_SendData(USART2, USART_ReceiveData(USART2));             
      }
      
}

ST固件库,有方便的地方,写程序很容易,但是有时候理解起来很麻烦,看自己的喜好然后选择吧。
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