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esp32: Bootloader wake deep sleep stub

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App can contain a stub program resident in RTC fast memory. Bootloader
will load the stub on initial boot. If the device wakes from deep sleep,
the stub is run immediately (before any other data is loaded, etc.)

To implement a custom wake stub, implement a function in your program:

```
void RTC_IRAM_ATTR esp_wake_deep_sleep(void)
{
  esp_default_wake_deep_sleep();
  // other wake logic
}
```

... and it will replace the default implementation.
This commit is contained in:
Angus Gratton
2016-09-12 17:23:15 +10:00
committed by Wu Jian Gang
parent b77bf9bc90
commit 7c494055e3
12 changed files with 264 additions and 34 deletions
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16
components/esp32/include/esp_attr.h
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@@ -17,8 +17,8 @@
#define ROMFN_ATTR
//Normally, the linker script will put all code and rodata in flash,
//and all variables in shared RAM. This can be redirected to IRAM if
//needed using these macros.
//and all variables in shared RAM. These macros can be used to redirect
//particular functions/variables to other memory regions.
// Forces code into IRAM instead of flash
#define IRAM_ATTR __attribute__((section(".iram1")))
@@ -26,4 +26,16 @@
// Forces data into DRAM instead of flash
#define DRAM_ATTR __attribute__((section(".dram1")))
// Forces code into RTC fast memory
#define RTC_IRAM_ATTR __attribute__((section(".rtc.text")))
// Forces data into RTC slow memory
// Any variable marked with this attribute will keep its value
// during a deep sleep / wake cycle.
#define RTC_DATA_ATTR __attribute__((section(".rtc.data")))
// Forces read-only data into RTC slow memory
// Makes constant data available to RTC wake stubs (see esp_deepsleep.h)
#define RTC_RODATA_ATTR __attribute__((section(".rtc.rodata")))
#endif /* __ESP_ATTR_H__ */