Commit Graph

5 Commits

Author SHA1 Message Date
Konstantin Kondrashov
f7df532ec0 bugfix/rtc_clk_32k_bootstrap: Fix starting 32k RTC
1. External 32kHz crystal is started for too long or it may not start at all. It is often observed at the first start.
2. At the first start, it is possible that the crystal did not start. And the recorded period was recorded as 0. Which led to a division error by zero during the transition to the deep sleep mode (Maybe somewhere else).
3. Added a unit test to test a new method of oscillation an external crystal.
4. Added a new method of oscillating of an external crystal. The legs of the crystal are fed with a 32 kHz frequency.

The new method eliminates these errors.

Added unit test: `\esp-idf\components\soc\esp32\test\test_rtc_clk.c`: `make TEST_COMPONENTS=soc`
- 8 Test starting external RTC crystal. Will pass.

`Bootstrap cycles for external 32kHz crystal` - is specified in the file Kconfig by default 100.

QA tested a new method of oscillation the crystal on 25 boards. The supply of square waves on the crystal showed a 100% result in contrast to the previous method of launching the crystal. After the tests, the old method was deleted.

Closes TW19143
2018-03-21 13:27:56 +05:00
Ivan Grokhotkov
a99483a727 docs: add information about execution time of ULP instructions 2017-12-11 14:05:41 +08:00
Ivan Grokhotkov
9317cb3434 soc/rtc: add tests for CPU frequency switching
These tests switch between PLL and XTAL frequencies for 10 seconds.
2017-10-26 19:53:53 +08:00
Ivan Grokhotkov
3323f31cfb soc: implement XTAL frequency detection
ROM code already implements XTAL frequency detection, but it uses the 8M
clock before the clock tuning parameters are initialized. With the
zero clock tuning parameter, 8M clock has significant frequency deviation
at high temperatures, which can lead to erroneous detection of 40 MHz
crystal as a 26 MHz one.

This change adds XTAL frequency detection code to rtc_clk_init routine,
and detection is performed after the 8M clock tuning parameter as been
initialized.
2017-04-24 15:29:30 +08:00
Ivan Grokhotkov
7ee8ee8b7e soc: add source code of rtc_clk, rtc_pm 2017-04-11 15:45:54 +08:00