system_* APIs cleanup
This changeset is mostly about cleaning up `system_*` APIs and moving them from libcore. It has dragged a few more changes along, however.
- `system_deep_sleep` deprecated, new name is `esp_deep_sleep`
- `system_efuse_read_mac` deprecated, new name is `esp_efuse_read_mac`
- `system_read/write_rtc_mem` removed (reason: we use linker to place code/data into RTC memory now)
- `system_get_sdk_version` deprecated. Returns "master" for now. Support for compile-time and runtime version detection will be done in a separate MR.
- `system_get_time` and variations have been deprecated. `gettimeofday` should be used instead.
- `system_restart` deprecated, new name is `esp_restart`. Rewritten code to work correctly from any of the cores.
- `system_restore` deprecated, `esp_wifi_restore` should be used instead.
- `system_get_rst_info` removed (it wasn't in a header file)
- RTC library has been updated to latest version
- Logging output from `libfoo.a` goes through `foo_printf` function now, where `foo ` is any of the library names. For libraries other than rtc and phy, this is a temporary measure, until we finish switching to esp_log library and clean up all uses of printf/ets_printf.
- ESP-IDF build will fail if any of the libraries have printf/ets_printf reference.
- Added `esp_random` function which gets values from HW RNG. I have added code which makes sure the value is not polled too often (allows at least 16 APB cycles). Also added a header file for HW RNG (just one register).
- Moved random number generation functions used by wpa library into wpa_supplicant component.
See merge request !234
Refs:
http://esp32.com/viewtopic.php?f=13&t=550http://esp32.com/viewtopic.php?f=13&t=551
rmt.c should include stdlib.h for malloc, esp_bignum,c &
https_request_main.c for abort().
FreeRTOSConfig.h is only including stdlib if
CONFIG_FREERTOS_ASSERT_ON_UNTESTED_FUNCTION is set. However, it is
included for abort() so needs to be included whenever
CONFIG_FREERTOS_ASSERT_FAIL_ABORT is set.
This change includes unconditionally in FreeRTOSConfig.h. This is to
avoid this kind of bug where compiler errors are dependent on config. I
suggest we don't change this to be more selective until we have 'make
randomconfig' style tests in CI.
NVS examples
Add two examples for working with NVS.
One is reading and writing an integer value, another is reading and writing a blob.
See merge request !194
