ESP8266 BOOT MODE

ESP8266有三种BOOT模式,由MTDO(GPIO15),GPIO0,GPIO2决定


MTDO GPIO0 GPIO2 Mode Description
L L H UART Download code from UART
L H H Flash Boot from SPI Flash
H x x SDIO Boot from SD-card
上电时打印的信息中boot mode:(x,y), x低3位为 {MTDO, GPIO0, GPIO2}.


参考:

https://github.com/esp8266/esp8266-wiki/wiki/Boot-Process



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