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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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45
components/esp32/deepsleep.c Normal file
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/* Wake from deep sleep stub
See esp_deepsleep.h esp_wake_deep_sleep() comments for details.
*/
#include <stddef.h>
#include <sys/lock.h>
#include "rom/cache.h"
#include "rom/rtc.h"
#include "soc/rtc_cntl_reg.h"
#include "esp_attr.h"
#include "esp_deepsleep.h"
/* Updating RTC_MEMORY_CRC_REG register via set_rtc_memory_crc()
is not thread-safe. */
static _lock_t lock_rtc_memory_crc;
esp_deep_sleep_wake_stub_fn_t esp_get_deep_sleep_wake_stub(void)
{
_lock_acquire(&lock_rtc_memory_crc);
uint32_t stored_crc = REG_READ(RTC_MEMORY_CRC_REG);
set_rtc_memory_crc();
uint32_t calc_crc = REG_READ(RTC_MEMORY_CRC_REG);
REG_WRITE(RTC_MEMORY_CRC_REG, stored_crc);
_lock_release(&lock_rtc_memory_crc);
if(stored_crc == calc_crc) {
return (esp_deep_sleep_wake_stub_fn_t)REG_READ(RTC_ENTRY_ADDR_REG);
} else {
return NULL;
}
}
void esp_set_deep_sleep_wake_stub(esp_deep_sleep_wake_stub_fn_t new_stub)
{
_lock_acquire(&lock_rtc_memory_crc);
REG_WRITE(RTC_ENTRY_ADDR_REG, (uint32_t)new_stub);
set_rtc_memory_crc();
_lock_release(&lock_rtc_memory_crc);
}
void RTC_IRAM_ATTR esp_default_wake_deep_sleep(void) {
mmu_init(0);
}
void __attribute__((weak, alias("esp_default_wake_deep_sleep"))) esp_wake_deep_sleep(void);