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USART1程序很多，看看USART2程序。注意紅色部分，首先要使能相關(guān)端口的時鐘。
因為USART2可以映射成不同的端口，所以要端口映射。
結(jié)合你自己的開發(fā)板，設(shè)置正確的映射口.(正點原子的是PA03PA02.)
STM32F103ZE默認的USART2就是PA03PA02，如果配置映射，USART2端口是PD05PD06了。
程序在正點原子開發(fā)板SRAM中調(diào)試通過，開發(fā)環(huán)境IAR5.30.
void USART2_Initialise( u32 bound )
{
GPIO_InitTypeDef GPIO_InitStructure;//I/O?ú3?ê??ˉ?á11ì?
NVIC_InitTypeDef NVIC_InitStructure;//?D??3?ê??ˉ?á11ì?
USART_InitTypeDef USART_InitStructure;//′??ú3?ê??ˉ?á11ì? ?
/* 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?°?éè???a9600;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//×?3¤?a8??êy?Y??ê?
USART_InitStructure.USART_StopBits = USART_StopBits_1; ? ? //ò???í￡?1??
USART_InitStructure.USART_Parity = USART_Parity_No; ? ? ? ?//?T????D￡?é??
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//Yá÷????
USART_InitStructure.USART_Mode = USART_Mode_Rx " USART_Mode_Tx;//ê?·￠?￡ê? ??
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)); ? ? ? ? ? ??
}
}
該程序功能是返回你發(fā)送到串口的數(shù)據(jù)。
如果你的USART2接到PD端口上面了，要修改程序如下，這里就需要端口映射了，映射寄存器是AFIO控制的，它接在APB2時鐘區(qū)域，所以下面的紅色代碼必須要有，藍色代碼對端口進行初始化。
void USART2_Initialise( u32 bound )
{
GPIO_InitTypeDef GPIO_InitStructure;//I/O?ú3?ê??ˉ?á11ì?
NVIC_InitTypeDef NVIC_InitStructure;//?D??3?ê??ˉ?á11ì?
USART_InitTypeDef USART_InitStructure;//′??ú3?ê??ˉ?á11ì? ?
/* 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?°?éè???a9600;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//×?3¤?a8??êy?Y??ê?
USART_InitStructure.USART_StopBits = USART_StopBits_1;//ò???í￡?1??
USART_InitStructure.USART_Parity = USART_Parity_No;//?T????D￡?é??
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//?Yá÷????
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;//ê?·￠?￡ê? ??
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)); ? ? ? ? ? ??
}
}
該程序功能是返回你發(fā)送到串口的數(shù)據(jù)。
如果你的USART2接到PD端口上面了，要修改程序如下，這里就需要端口映射了，映射寄存器是AFIO控制的，它接在APB2時鐘區(qū)域，所以下面的紅色代碼必須要有，藍色代碼對端口進行初始化。
void USART2_Initialise( u32 bound )
{
GPIO_InitTypeDef GPIO_InitStructure;//I/O?ú3?ê??ˉ?á11ì?
NVIC_InitTypeDef NVIC_InitStructure;//?D??3?ê??ˉ?á11ì?
USART_InitTypeDef USART_InitStructure;//′??ú3?ê??ˉ?á11ì? ?
/* 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?°?éè???a9600;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//×?3¤?a8??êy?Y??ê?
USART_InitStructure.USART_StopBits = USART_StopBits_1;//ò???í￡?1??
USART_InitStructure.USART_Parity = USART_Parity_No;//?T????D￡?é??
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//?Yá÷????
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //ê?·￠?￡ê? ??
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)); ? ? ? ? ? ??
}
}
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