Implementing Failsafe Mechanism for Firmware Updates on ESP32
Hey guys i am building a custom ESP32-based project (using the ESP32 DevKitC v4 board, with ESP-IDF version 4.4) and want to implement a failsafe mechanism for firmware updates. I've connected GPIO0 to ground via a switch, intending to enter flash mode when the button is pressed and
During the restart process, I've captured the following logs and debug messages:
"Restarting..."
"CPU reset..."
"Boot mode: 3 (FLASH BOOT)"
"Flash booting @ 0x1000"
Despite these logs indicating a flash boot, the board doesn't enter flash mode. I've tried using
Can I force a full boot process, potentially using a direct jump to the hardware reset vector, to enter flash mode when the button is pressed and
ESP.restart()ESP.restart()During the restart process, I've captured the following logs and debug messages:
"Restarting..."
"CPU reset..."
"Boot mode: 3 (FLASH BOOT)"
"Flash booting @ 0x1000"
Despite these logs indicating a flash boot, the board doesn't enter flash mode. I've tried using
ESP.restart()Can I force a full boot process, potentially using a direct jump to the hardware reset vector, to enter flash mode when the button is pressed and
ESP.restart()Solution
Use the ESP32's RTC_CNTL_SW_SYS_RST register to perform a hardware reset @Daniel kalu , it will check the state of GPIO0 and enter flash mode if it's grounded.
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