STM32F051芯片和STM32F103芯片之间使用USART通信，一次传两个数据还可以接收到，再多点就接收不到了，是为什么啊？？？

有道无界 · 发表于 2015-5-21 14:34:26

STM32F051芯片和STM32F103芯片之间使用USART通信，一次传两个数据还可以接收到，再多了就接收不到了，波特率都是9600.

STM32F051 USART初始化程序如下：
void Uart_Init(u32 bound)
{

GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

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

USART_DeInit(USART1);

//USART1_TX PA.9?? USART1_RX

A.10
GPIO_PinAFConfig(GPIOA,GPIO_PinSource9,GPIO_AF_1);
GPIO_PinAFConfig(GPIOA,GPIO_PinSource10,GPIO_AF_1);

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 = 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);

NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPriority = 0x00;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);

USART_Cmd(USART1, ENABLE);
}

STM32F103 USART初始化程序如下：
void uart_init(u32 bound){
//GPIO?????è??
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA, ENABLE); //????USART1??GPIOA?±??
USART_DeInit(USART1); //?????®??1
//USART1_TX PA.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; //???????ì????
GPIO_Init(GPIOA, &GPIO_InitStructure); //??????PA9

//USART1_RX

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

//USART ???????è??

USART_InitStructure.USART_BaudRate = bound;//??°??è????9600;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//×??¤??8??????????
USART_InitStructure.USART_StopBits = USART_StopBits_1;//??????????
USART_InitStructure.USART_Parity = USART_Parity_No;//?????????é??
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//???????????÷????
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //??·?????

USART_Init(USART1, &USART_InitStructure); //???????®??
#if EN_USART1_RX //??????????????
//Usart1 NVIC ????
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//??????????3
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //×???????3
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ?¨??????
NVIC_Init(&NVIC_InitStructure); //?ù?????¨????????????VIC?????÷

USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//????????
#endif
USART_Cmd(USART1, ENABLE); //?????®??

}