STM32F103C6T6的串口发送出现奇怪问题!
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STM32F103C6T6的串口发送出现奇怪问题!与CC2530通讯是能收到数据,但发送的数据有几个字节是错误的,好奇怪!而且无法用DMA发送,最奇怪的是,程序下载完成后。用锂电池供电,运行指示灯正常闪烁。但串口则没有数据(用示波器测试),连接JTAG就有数据。超级奇怪!
DMA配置:
DMA_DeInit(DMA1_Channel2); DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)SRC_USART1_DR; DMA_InitStructure.DMA_MemoryBaseAddr = (u32)&USARTSendBuff; DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST; DMA_InitStructure.DMA_BufferSize = Len; 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(DMA1_Channel2, &DMA_InitStructure); USART_DMACmd(USART1, USART_DMAReq_Tx, ENABLE); // Enable DMA1 channel2 DMA_Cmd(DMA1_Channel2, ENABLE);
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