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串口连接4G模块修改问题 #6

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@sb10000

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@sb10000

想用A01外接ML307 4G模块,需要Uart口进行通信,遇到问题如下:
如果定义 ML307_RX_PIN GPIO_NUM_19
ML307_TX_PIN GPIO_NUM_20
就会报错
如果定义ML307_RX_PIN GPIO_NUM_10
ML307_TX_PIN GPIO_NUM_18
就能正常编译

是不是这个串口被内置的ASR芯片占用了?或者是说明书文件里的引脚标错了?这个引出的串口能否使用?麻烦解答一下
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