最近有项目需要用到STM32F103RCT6的USART1,UART4,UART5。其中USART1和UART4采用DMA方式收发且都能正常工作，唯独这个UART5死活就是能收不能发。而更诡异的是总共焊了5块样板，相同的烧录文件其中有2块UART5可以正常收发另外3块UART5能收不能发。进一步查找原因发现将2块正常的样板和3块不正常的样板交换单片机IC后，发现问题出在单片机IC上，2台正常的样板现在不正常了，而换了IC的2块原来异常的板也正常了。
以下是我的初始化源代码：
- void UART45_Init(void)
- {
- //GPIO端口设置
- GPIO_InitTypeDef GPIO_InitStructure;
- USART_InitTypeDef USART_InitStructure;
- DMA_InitTypeDef DMA_InitStructure;
- RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA2, ENABLE);
- RCC_APB1PeriphClockCmd(RCC_APB1Periph_UART4|RCC_APB1Periph_UART5, ENABLE);
- USART_DeInit(UART4);
- //UART45_TX
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10|GPIO_Pin_12;
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
- GPIO_Init(GPIOC, &GPIO_InitStructure);
- //UART4_RX
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
- GPIO_Init(GPIOC, &GPIO_InitStructure);
- //UART5_RX
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
- GPIO_Init(GPIOD, &GPIO_InitStructure);
- //USART 初始化设置
- USART_InitStructure.USART_BaudRate = 9600;
- 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(UART4, &USART_InitStructure);
- USART_Init(UART5, &USART_InitStructure);
- USART_ITConfig(UART4, USART_IT_IDLE, ENABLE);
- USART_ITConfig(UART5, USART_IT_IDLE, ENABLE);
- USART_ITConfig(UART5, USART_IT_RXNE, ENABLE);
- USART_Cmd(UART4, ENABLE);
- USART_Cmd(UART5, ENABLE);
- DMA_DeInit(DMA2_Channel3);
- DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&UART4->DR;
- DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)(u4rxd_array);
- DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
- DMA_InitStructure.DMA_BufferSize = sizeof(u4rxd_array);
- DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
- DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
- DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
- DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
- DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
- DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;
- DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
- DMA_Init(DMA2_Channel3, &DMA_InitStructure);
- DMA_ITConfig(DMA2_Channel3, DMA_IT_TC, ENABLE);
- USART_DMACmd(UART4, USART_DMAReq_Rx, ENABLE);
- DMA_Cmd (DMA2_Channel3,ENABLE);
- DMA_DeInit(DMA2_Channel5);
- DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&UART4->DR;
- DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)(u4txd_array);
- DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
- DMA_InitStructure.DMA_BufferSize = 0;
- DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
- DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
- DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
- DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
- DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
- DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;
- DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
- DMA_Init(DMA2_Channel5, &DMA_InitStructure);
- DMA_ITConfig(DMA2_Channel5, DMA_IT_TC, DISABLE);
- USART_DMACmd(UART4, USART_DMAReq_Tx, ENABLE);
- DMA_Cmd (DMA2_Channel5,DISABLE);
- }
复制代码
debug发现不正常的样板向UART5->DR写数据其值不会发生变化，请高人指点一下@香水城
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歹徒兄弟 提问时间: 2023-09-25 14:32:02 / 未解决
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butterflyspring 回答时间: 2023-09-25 14:57:29
废鱼 回答时间: 2023-09-25 15:20:22
Tcreat 回答时间: 2023-09-25 15:39:24