问答-
GD32F503RCT6 无法启动DMA发送
如下程序，使用DMA发送数据到USART2，单发USART正常发送，但用DMA批量发送不能启动： dmamux_event_generation_disable(DMAMUX_MUXCH2); //DMAMUX_MUXCH1 dma_interrupt_disable(DMA0,DMA_CH3,DMA_INT_FTF); usart_transmit_config(USART2, USART_TRANSMIT_ENABLE); usart_flag_clear(USART2,USART_FLAG_TC); usart_dma_transmit_config(USART2,USART_DENT_ENABLE); //usart_dma_transmit_config(USART2,USART_DENT_DISABLE); dma_channel_disable(DMA0,DMA_CH3); //DMA_CH1 -> DMA_CH3 //usart_data_transmit(USART2,0x55); dma_memory_address_config(DMA0,DMA_CH3,(uint32_t)lcdptr->lcdtx); dma_transfer_number_config(DMA0,DMA_CH3,lcdptr->lcdtxleng); dma_interrupt_flag_clear(DMA0,DMA_CH3,DMA_INT_FLAG_FTF); dma_interrupt_enable(DMA0,DMA_CH3,DMA_INT_FTF); dmamux_request_id_config(DMAMUX_MUXCH2,DMA_REQUEST_USART2_TX); dmamux_synchronization_disable(DMAMUX_MUXCH2); dma_channel_enable(DMA0,DMA_CH3); //dmamux_event_generation_enable(DMAMUX_MUXCH1); lcdptr->lcdst = TRANS_IN; 有劳高手指点！！！！
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