Photonicat TTL，Watchdog，Recovery说明

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为了方便调试，PCBA中预留了TTL的UART，console debug，速率: 1500000

ttl debug位置

此处为3个pin，需要自行焊接一个调试口，可以使用picocom / PuTTY 链接，参数：1500000bps, 8N1, No Flow Control.

mcu watchdog disable位置

默认有watchdog，在没有喂狗的情况下会重启。短路即可关闭狗。位置如下：

recovery button位置

USB烧录需要使用recovery button，位置如下：

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