本帖最后由 电子write_cai 于 2014-4-9 17:35 编辑
Hi,all:
The stm32f429i Discovery USART interface is PA10,PA9.
The code is correct. but tx data can not captured by the oscilloscope.
add the coding....
/*******Main code*****/
int main(void)
{
delay_init();
USART1_init();
NVIC_Config();
LED_Init();
while (1)
{
LED0=1;
LED1=1;
delay_ms(500);
LED0=0;
LED1=0;
delay_ms(500);
printf("STM32F429I DISCOVERY USART INITOK\r\n");
}
}
/***********USART_Init()********/void USART1_init()
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
USART_ClockInitTypeDef USART_ClockInitStruct;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA , ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_USART1);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_USART1);
GPIO_StructInit(&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_9;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA,&GPIO_InitStructure);
/*??PA10?Rx??*/
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA,&GPIO_InitStructure);
/*??USART1,?????Cotex M3??*/
USART_StructInit(&USART_InitStructure);
USART_InitStructure.USART_BaudRate =115200;
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_ClockStructInit(&USART_ClockInitStruct);
USART_ClockInit(USART1, &USART_ClockInitStruct);
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
USART_Cmd(USART1, ENABLE);
USART_ClearFlag(USART1, USART_FLAG_TC);
}
/*********NVIC_Config(void)***********/void NVIC_Config(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
}
/*********Usart Interrupt**********/void USART1_IRQHandler(void)
{
uint16_t uData=0;
if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET) //???????
{
USART_ClearITPendingBit(USART1,USART_IT_RXNE);
uData=USART_ReceiveData(USART1);
USART_SendData(USART1, uData); //???????
}
}
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