STM32 UART2程序--端口重映射
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STM32 UART2程序 2012-12-04 16:26:05
分类: LINUX
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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