Commit graph

10 commits

Author SHA1 Message Date
Ivan Grokhotkov
8ccb2a4990 esp32: make time monotonic across resets
Small changes to clock calibration value will cause increasing errors
the longer the device runs. Consider the case of deep sleep, assuming
that RTC counter is used for timekeeping:
- before sleep:
   time_before = rtc_counter * calibration_val
- after sleep:
   time_after = (rtc_counter + sleep_count) * (calibration_val + epsilon)
where 'epsilon' is a small estimation error of 'calibration_val'.
The apparent sleep duration thus will be:
time_after - time_before = sleep_count * (calibration_val + epsilon)
                           + rtc_counter * epsilon

Second term on the right hand side is the error in time difference
estimation, it is proportional to the total system runtime (rtc_counter).

To avoid this issue, this change makes RTC_SLOW_CLK calibration value
persistent across restarts. This allows the calibration value update to
be preformed, while keeping time after update same as before the update.
2017-06-16 12:06:04 +08:00
Ivan Grokhotkov
7ee8ee8b7e soc: add source code of rtc_clk, rtc_pm 2017-04-11 15:45:54 +08:00
Angus Gratton
e53d307814 Panic handler: Use same reset path as esp_restart(), disabling hardware
Closes #223 https://github.com/espressif/esp-idf/issues/223
2017-01-13 14:37:36 +11:00
Ivan Grokhotkov
b24ac487cb newlib: use RTC_STORE registers to keep boot time instead of RTC_SLOW_MEM
This allows RTC_SLOW_MEM to be powered down in deep sleep if no other variables are placed into RTC_SLOW_MEM.
2017-01-12 14:43:34 +08:00
jack
4e092be6d6 Add Comments
We reserve 4KB Slow RTC memory to save RF calibation result and BT NVS data.
If not all these Slow RTC momory Blocks are used, we will open the other parts.
2016-09-29 16:29:13 +08:00
xiaxiaotian
ec03c31ec4 1. Change the deep sleep stub code to fix wake bug. 2016-09-28 11:52:39 +08:00
Angus Gratton
7c494055e3 esp32: Bootloader wake deep sleep stub
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.
2016-09-28 11:14:58 +08:00
Wu Jian Gang
04b53643ef header files: clean up
1. format;
2. Slow RTC memory reverse 2KB;
2016-09-12 17:47:50 +08:00
jack
24011ddd05 header files: modify rom code and soc header files
1. timer reg file for both time group 0 and time group 1, not only timer group 0
2. fix bug that io mux header file mismatch with chip
3. fix bug that some BASE address not correct
4. add some static function to eagle.fpga32.rom.addr.v7.ld
5. add interrupts usage table
6. add some comments for rom code functions
2016-09-12 17:47:49 +08:00
Ivan Grokhotkov
bd6ea4393c Initial public version 2016-08-17 23:08:22 +08:00