Description
Board
ESP32-WROOM-32UE
Device Description
Custom hardware but same pinout as the Adafruit ESP32-Feather
Hardware Configuration
USB on UART0 for programming/debugging
Version
v2.0.3
IDE Name
PlatformIO
Operating System
Win10
Flash frequency
? default
PSRAM enabled
no
Upload speed
460800 (default)
Description
This is an error I've been ignoring for a long time but finally investigated and isolated. When "CORE_DEBUG_LEVEL=5", I see a corrupt entry in the startup messages in the output terminal. I thought it was an issue with my code, but I traced it down to this Arduino library:
https://github.com/espressif/arduino-esp32/blob/master/cores/esp32/esp32-hal-cpu.c#L214
Basically setCpuFrequencyMhz() contains a debug message stating what frequency is set. However it prints while the CPU frequency is changing, which causes trash to print to UART 0.
Possible fixes:
-
Move the debug message after the frequency switch.
I movedlog_d("%s: %u / %u = %u Mhz, APB: %u Hz", (conf.source == RTC_CPU_FREQ_SRC_PLL)?"PLL":((conf.source == RTC_CPU_FREQ_SRC_APLL)?"APLL":((conf.source == RTC_CPU_FREQ_SRC_XTAL)?"XTAL":"8M")), conf.source_freq_mhz, conf.div, conf.freq_mhz, apb);to the end of the function setCpuFrequencyMhz() and the message appears to print properly. -
Wait for debug message to finish sending (Flush UART 0) before continuing.
Sketch
platform = https://github.com/tasmota/platform-espressif32/releases/download/v2.0.3/platform-espressif32-2.0.3.zip
I verified the issue exists in the latest master. See https://github.com/espressif/arduino-esp32/blob/master/cores/esp32/esp32-hal-cpu.c#L214.
_________________________________
#include "Arduino.h"
void setup() {
log_d("setup()");
}
void loop() {
Serial.println("Hello World");
delay(1000);
}Debug Message
Original log:
`
entry 0x400805c4
��␙ɕ�Օ���5��J�␂���J␂�␂z␂�␂�␂���␂j��␂
␅%J␂������␂B�5R�[ 20][D][main.cpp:12] setup(): setup()
`
Log after moving debug line:
`
entry 0x400805c4
[ 4][D][esp32-hal-cpu.c:246] setCpuFrequencyMhz(): PLL: 480 / 2 = 240 Mhz, APB: 80000000 Hz
[ 20][D][main.cpp:12] setup(): setup()
`
Other Steps to Reproduce
No response
I have checked existing issues, online documentation and the Troubleshooting Guide
- I confirm I have checked existing issues, online documentation and Troubleshooting guide.