v3.0.0 detects / defaults to wrong XTAL frequency on ESP32-D0WDQ6-V3 - millis and UART baud are not correct
PaulZC opened this issue · comments
Board
SparkFun ESP32 Thing
Device Description
The SparkFun ESP32 Thing is a 3rd Party Board based on the ESP32-D0WDQ6-V3 chip with a 26MHz XTAL
https://www.sparkfun.com/products/13907
Hardware Configuration
Only USB
Version
v3.0.0
IDE Name
Arduino IDE
Operating System
Windows
Flash frequency
80MHz
PSRAM enabled
no
Upload speed
921600
Description
A full write-up, diagnosis and fix available at: sparkfun/ESP32_Thing_Plus#7
In cores below 3.0.0, the XTAL frequency was detected correctly. millis and UART baud rates were correct.
From 3.0.0, the XTAL frequency is detected as or defaults to 40MHz. millis and UART baud rates are off by a factor of 1.54.
Using the Serial_All_CPU_Freqs example:
For the 2.0.17 version it produces ...
CPU Freq = 240 MHz
XTAL Freq = 26 MHz
APB Freq = 80000000 Hz
For the 3.0.1 version it produces ...
CPU Freq = 240 MHz
XTAL Freq = 40 MHz
APB Freq = 80000000 Hz
We have a work-around:
#include "soc/rtc.h"
rtc_clk_xtal_freq_update((rtc_xtal_freq_t)26);
rtc_clk_cpu_freq_set_xtal();
setCpuFrequencyMhz(240);
But it would be really nice if the core could be corrected / updated... Thanks!
Sketch
https://github.com/espressif/arduino-esp32/blob/master/libraries/ESP32/examples/Serial/Serial_All_CPU_Freqs/Serial_All_CPU_Freqs.inoDebug Message
N/A
Other Steps to Reproduce
N/A
I have checked existing issues, online documentation and the Troubleshooting Guide
- I confirm I have checked existing issues, online documentation and Troubleshooting guide.
Have ran into the same issue, seems like the setting has changed from
arduino-esp32/tools/sdk/esp32/sdkconfig
Line 777 in a6df1f5
to
https://github.com/espressif/esp32-arduino-libs/blob/a6dac936bfcfa4c11468e003f550b41c76efeae6/esp32/sdkconfig#L1086
We could not keep the crystal to AUTO, because other things stopped working. I can not recall what was exactly breaking, but it was critical.
That might explain it! ;-) Many thanks Ivan. Best wishes.
Many thanks @me-no-dev,
I don't want this to soak up much of your time - especially as the ESP32-D0WDQ6-V3 is NRND, and I think this is the only SparkFun board with a 26MHz crystal, and the work-around works...
Maybe it could be possible to specify / override the XTAL frequency through boards.txt?
Best wishes,
Paul
Maybe it could be possible to specify / override the XTAL frequency through boards.txt?
Unfortunately this would require rework that is just not worth for a single type of board (I also do not know of another board with 26MHz crystal) which was manufactured in the very early ESP32 days. I have a few myself and would rather replace their crystals. Would have been great if we could keep the crystal to AUTO also. I tried to find out what was happening, but the change came in a PR with many, many changes and message was not so clear.
I also do not know of another board with 26MHz crystal
In my case it was with Heltec Lora boards, they used to come with 26 MHz XTALs. Unfortunately replacing an XTAL is not an option for me, but I went back to v2.0.x for the time being.
I went back to v2.0.x for the time being.
You could try the workaround above