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在BLE-CC254x-1.4.0协议栈中定义HAL_UART_DMA的值为2，怎么在工程的预定义中实现。顺便问一下HAL_UART_DMA、HAL_UART_ISR有什么区别，一般二线制的串口选哪个......谢谢
DMA要优于ISR，占用CPU少。定义看这边： http://blog.csdn.net/shiwaxinbin/article/details/9004256
