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void USART2_IRQHandler(void) { uint8_t i=0; if(RESET != USART_GetITStatus(USART2, USART_IT_IDLE))//接收非空 { /* clear IDLE flag */ rc_tmp=USART2->ISR; rc_tmp=USART2->RDR;//软件序列清除IDLE标志位 USART2->ICR = 1<<3; USART2->ICR = 1<<4; USART_ClearITPendingBit(USART2,USART_IT_IDLE); for(i=0;i<7;i++) { recive_485buf = rxbuf; } UART_RX_Proc(); DMA_Cmd(DMA1_Channel5,DISABLE); DMA_SetCurrDataCounter(DMA1_Channel5, 10); DMA_Cmd(DMA1_Channel5,ENABLE); } if(RESET != USART_GetITStatus(USART2, USART_IT_TXE))//发送完成 { USART_ClearITPendingBit(USART2, USART_IT_TXE); GPIO_ResetBits(GPIOA,GPIO_Pin_4); } } static void usart_dma_init(void) { DMA_InitTypeDef DMA_InitStructure; NVIC_InitTypeDef NVIC_Initstrcuture; RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1,ENABLE);//DMA1时钟使能 /* tx */ DMA_DeInit(DMA1_Channel4); DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&(USART2->TDR); //DMA外设地址 DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)txbuf; DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST; DMA_InitStructure.DMA_BufferSize = 0; //数据传输量 DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外设非增量模式 DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //存储器增量模式 DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; //外设数据长度:8位 DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte; //存储器数据长度:8位 DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; // 使用普通模式 DMA_InitStructure.DMA_Priority = DMA_Priority_High; //中等优先级 DMA_Init(DMA1_Channel4, &DMA_InitStructure); DMA_Cmd(DMA1_Channel4,DISABLE); /* rx */ DMA_DeInit(DMA1_Channel5); DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&(USART2->RDR); //DMA外设地址 DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)rxbuf; DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC; DMA_InitStructure.DMA_BufferSize = 10; //数据传输量 DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外设非增量模式 DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //存储器增量模式 DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; //外设数据长度:8位 DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte; //存储器数据长度:8位 DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; // 使用普通模式 DMA_InitStructure.DMA_Priority = DMA_Priority_High; //中等优先级 DMA_Init(DMA1_Channel5, &DMA_InitStructure); DMA_Cmd(DMA1_Channel5,ENABLE); } void USART2_Config(void) { GPIO_InitTypeDef GPIO_Initstructure; USART_InitTypeDef USART_Initstructure; NVIC_InitTypeDef NVIC_Initstrcuture; // RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE ); RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE); RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA ,ENABLE ); GPIO_PinAFConfig(GPIOA,GPIO_PinSource2,GPIO_AF_1); GPIO_PinAFConfig(GPIOA,GPIO_PinSource3,GPIO_AF_1); //TX GPIO_Initstructure.GPIO_Pin = GPIO_Pin_2; 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); //RX GPIO_Initstructure.GPIO_Pin = GPIO_Pin_3; 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); //485 set GPIO_Initstructure.GPIO_Pin = GPIO_Pin_4; GPIO_Initstructure.GPIO_Mode = GPIO_Mode_OUT; 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); GPIO_ResetBits(GPIOA,GPIO_Pin_4); USART_Initstructure.USART_BaudRate = 115200; USART_Initstructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; USART_Initstructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; USART_Initstructure.USART_Parity = USART_Parity_No; USART_Initstructure.USART_StopBits = USART_StopBits_1; USART_Initstructure.USART_WordLength = USART_WordLength_8b; USART_Init(USART2,&USART_Initstructure); NVIC_Initstrcuture.NVIC_IRQChannel = USART2_IRQn; NVIC_Initstrcuture.NVIC_IRQChannelPriority=3; NVIC_Initstrcuture.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_Initstrcuture); usart_dma_init(); USART_DMACmd(USART2, USART_DMAReq_Rx | USART_DMAReq_Tx, ENABLE); USART_ITConfig(USART2, USART_IT_IDLE, ENABLE);//开启空闲中断 USART_ClearITPendingBit(USART2,USART_IT_IDLE); USART_ClearFlag(USART2, USART_FLAG_IDLE); USART_ITConfig(USART2, USART_IT_TXE, ENABLE); USART_ClearITPendingBit(USART2, USART_IT_TXE); USART_ClearFlag(USART2, USART_IT_TXE); USART_Cmd(USART2, ENABLE); } void USART0_DMAsend(uint8_t Len) { GPIO_SetBits(GPIOA,GPIO_Pin_4); DMA_Cmd(DMA1_Channel4,DISABLE); DMA_SetCurrDataCounter(DMA1_Channel4, Len); DMA_Cmd(DMA1_Channel4,ENABLE); while (RESET == DMA_GetFlagStatus(DMA1_FLAG_TC2)) {} } |
Error in final launch sequence: Failed to execute MI command: target remote localhost:61234
STM32U535能用USART1进行串口烧录吗？我USB转TTL接到NUCLEO的CN4几个对应的脚后，用FLY MCU进行烧录，都识别不到芯片，BOOT0引脚要怎么处理？
STM32F103做从站 上电过程，上位机不断发送数据造成，通讯失败，请大侠指导一下
stm32f105 串口数据丢失
STM32F107的USART2进不了中断
下载到flash无法运行，开调试就能成功，是什么问题？
IAR 9.x环境下STM32重定向串口scanf如何实现？
STM32是小端模式，但为什么Keil中memory窗口和反汇编窗口的32位指令不一致？
各位朋友，有没有STM32F0系列教程，最好是汇编语言的。
STM32F042F6P6TR
在使能相关中断之前可以先针对性地做下中断标志的清零操作。
另外,使用CUBEMX配置并开启相关DMA功能时，DMA传输半完成中断和完成中断
都是默认开启了的，注意在中断服务程序里 做相关标志的清零。当然，如果是基于
cubeMx生成的代码，你只是使用回调函数做相应处理的话，那些标志位在库代码里
是会帮我们在中断服务程序里做清零处理的。