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- 注册时间
- 2019-8-8
- 在线时间
- 42 小时
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10金钱
请求大佬帮忙看下串口的基本配置和传输有没有问题
配置
- void uart2_init(u32 bound){
- GPIO_InitTypeDef GPIO_InitStructure;
- USART_InitTypeDef USART_InitStructure;
- NVIC_InitTypeDef NVIC_InitStructure;
-
- RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE);
- RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);
-
- GPIO_PinAFConfig(GPIOA,GPIO_PinSource2,GPIO_AF_USART2); //GPIOA2
- GPIO_PinAFConfig(GPIOA,GPIO_PinSource3,GPIO_AF_USART2); //GPIOA3
-
- //USART1¶Ë¿úÅäÖÃ
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; //GPIOA2óëGPIOA3
- 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);
-
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
- GPIO_Init(GPIOA, &GPIO_InitStructure);
-
- //USART2
- 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(USART2, &USART_InitStructure);
-
- USART_Cmd(USART2, ENABLE);
-
- //USART_ClearFlag(USART1, USART_FLAG_TC);
-
- #if EN_USART2_RX
- USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
- //Usart2 NVIC
- NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3;
- NVIC_InitStructure.NVIC_IRQChannelSubPriority =3;
- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
- NVIC_Init(&NVIC_InitStructure);
- #endif
-
- }
复制代码 发送
- void USART_SendString(USART_TypeDef * pUSARTx, char *str)
- {
- unsigned int k=0;
- while(*(str+k)!='\0')
- {
- USART_SendData(pUSARTx, *(str+k));
- while (USART_GetFlagStatus(pUSARTx, USART_FLAG_TXE) == RESET);
- k++;
- }
- while(USART_GetFlagStatus(pUSARTx,USART_FLAG_TC)==RESET);
- }
复制代码 接收
- void USART2_IRQHandler(void)
- {
- u8 Res;
- static u8 count = 0;
- #if SYSTEM_SUPPORT_OS //èç1ûSYSTEM_SUPPORT_OSÎaÕæ£¬ÔòDèòaÖ§3ÖOS.
- OSIntEnter();
- #endif
- if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET)
- {
- Res =USART_ReceiveData(USART2);//(USART1->DR);
-
- revbuf[count++] = Res;//revbuf是全局变量
- if(count==5){
- count=0;
- }
-
- }
- #if SYSTEM_SUPPORT_OS
- OSIntExit();
- #endif
- }
复制代码 关于407探索者的串口是TTL还是232还是485
最后那个六个排针,(com_TX,com_RX)对应TTL, (PA2_TX, PA3_RX)对应232, (485_TX, 485_RX)对应485是吗?
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最佳答案
查看完整内容[请看2#楼]
这个你得看教程。6个针,COM代表RS232的意思,PA2,PA3就是MCU IO了。 485、就是对应485芯片
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