ESP8266 WDT AS TIMER INSTALL

Note that ets_* functions cannot be used on RTOS SDK.

ROM does not provide a function to feed WDT, but invoking ets_wdt_restore(desired_mode) will re-configure WDT with previously saved interval and restart it.

ESP8266 WDT AS TIMER INSTALL

In interrupt mode, WDT asserts interrupt number 8, it is possible to install custom handler with ets_isr_attach(). WDT is configured for 2-stage operation, both intervals from arg2. WDT is configured in single stage mode, reload value from arg2. WDT is fed automatically when stage 0 expires and generates an interrupt. WDT is configured in 2-stage mode, reload value from arg1. A software timer is setup to auto-feed the WDT at the interval passed as arg1 (in microseconds). WDT is configured in single stage mode, with reload value from arg2 (a choice of 3 intervals). Void ets_wdt_enable(uint32_t mode, uint32_t arg1, uint32_t arg2) ДЇrom disassembling the functions, we learn that ETS allows 4 different modes for watchdog (the mode argument to ets_wdt_enable()): Here they are, with reconstructed prototypes: void ets_wdt_init(void) The linker script shows a number of ets_wdt_* functions provided by ROM. This article describes the process and the results. While working on Mongoose OS ESP8266 port, we reverse-engineered most of the module's functionality and ROM functions. As many parts of ESP8266, it is undocumented. ESP8266 contains a hardware watchdog timer (WDT) module.

Esp8266 wdt as timer