使用GD32F450ZGT6 usart0和 DMA1CH2完成空闲中断加DMA接收不定长数据 参考链接:https://blog.csdn.net/qq_38113006/article/details/105843921?utm_medium=distribute.pc_relevant.none-task-blog-BlogCommendFromBaidu-1.nonecase&depth_1-utm_source=distribute.pc_relevant.none-task-blog-BlogCommendFromBaidu-1.nonecase
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