首先F4勾选了microl lib选项,串口调试助手显示没有收到数据,但是- #include "bsp_usart.h"
- void NVIC_USART1_Config(void)
- {
- NVIC_InitTypeDef NVIC_InitStructure;
- NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
-
- NVIC_InitStructure.NVIC_IRQChannel=USART1_IRQn;
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0x00;
- NVIC_InitStructure.NVIC_IRQChannelSubPriority=0x02;
- NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
- NVIC_Init(&NVIC_InitStructure);
- }
- void USART1_Config(void)
- {
- GPIO_InitTypeDef GPIO_InitStructure;
- USART_InitTypeDef USART_InitStructure;
-
-
- RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA , ENABLE);
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
- //串口1对应引脚复用映射
- GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_USART1);
- GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_USART1);
-
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9|GPIO_Pin_10;
- 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_NOPULL;
- GPIO_Init(GPIOA, &GPIO_InitStructure);
-
- NVIC_USART1_Config();
- 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_ITConfig(USART1,USART_IT_RXNE,ENABLE);
-
- USART_Cmd(USART1,ENABLE);
- }
- /// 重定向c库函数printf到USART1
- int fputc(int ch, FILE *f)
- {
- /* 发送一个字节数据到USART1 */
- USART_SendData(USART1, (uint8_t) ch);
-
- /* 等待发送完毕 */
- while (USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET);
-
- return (ch);
- }
- /// 重定向c库函数scanf到USART1
- int fgetc(FILE *f)
- {
- /* 等待串口1输入数据 */
- while (USART_GetFlagStatus(USART1, USART_FLAG_RXNE) == RESET);
- return (int)USART_ReceiveData(USART1);
- }
- /*********************************************END OF FILE**********************/
- void USART1_IRQHandler(void)
- {
- char c;
- if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
- {
- c=USART_ReceiveData(USART1);
- USART_SendData(USART1,c);
- }
- }
复制代码
将板子TX,RX短接后收发显示正常,用别人的成功例程也是这样的问题,求助这是什么原因??? |