I have some code running as a FreeRTOS task on my ESP32. I would like to toggle an output pin in the order of microseconds so use the function delayMicroseconds. However, this crashes my ESP32 every time. Even a simple loop causes it to crash:
for ( int i = 0 ; i < 10000 ; i++ )
{
delayMicroseconds( 1000 );
}
This code results in:
ELF file SHA256: 0000000000000000
Backtrace: 0x4008860c:0x3ffbf8f0 0x40088889:0x3ffbf910 0x401300bc:0x3ffbf930 0x40086f31:0x3ffbf950 0x40084241:0x3ffccd50 0x40084eaf:0x3ffccd70 0x400811d3:0x3ffccd90 0x40081213:0x3ffccdb0 0x400d0c7f:0x3ffccdd0 0x400d146d:0x3ffcce40 0x4008989a:0x3ffcce60
Rebooting...
ets Jul 29 2019 12:21:46
rst:0xc (SW_CPU_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 271414342, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:2
load:0x3fff0018,len:4
load:0x3fff001c,len:1044
load:0x40078000,len:10124
load:0x40080400,len:5828
entry 0x400806a8
I would really appreciate any advice on how to reliably delay in microseconds under a task.
Andy
To what is this backtrace decoded when you activate debug build and the exception decoder per SW_CPU_RESET on esp32 (Boot Loop) - #2 by maxgerhardt ?
Are you sure this won’t make the watchdog bite if you don’t feed it in between?
@maxgerhardt I am not exactly sure where I am supposed to put
build_type = debug
monitor_filters = esp32_exception_decoder
in platformio.ini but wherever I put those lines, the exception message is still the same as I originally posted
I was not aware a watchdog was enabled and not sure how you go about kicking it if it is enabled.
Andy
What’s your current platformio.ini?
@maxgerhardt
My current platformio.ini is:
; PlatformIO Project Configuration File
;
; Build options: build flags, source filter
; Upload options: custom upload port, speed and extra flags
; Library options: dependencies, extra library storages
; Advanced options: extra scripting
;
; Please visit documentation for the other options and examples
; https://docs.platformio.org/page/projectconf.html
[platformio]
default_envs = view
[base_config]
platform = espressif32@3.4
framework = arduino
monitor_speed = 115200
monitor_flags =
--eol=CRLF
--echo
--filter=esp32_exception_decoder
lib_deps =
build_flags =
-DCORE_DEBUG_LEVEL=ARDUHAL_LOG_LEVEL_DEBUG
;
; This line is required when using LILYGO® T-Micro32 Plus 8MB flash 2MB Psram ESP32
; to make use of the extended FLASH. Make sure you copy lilygo_app.csv from the root
; of this project to here:
; C:\Users\mail\.platformio\packages\framework-arduinoespressif32@3.10006.210326\tools\partitions
;
;board_build.partitions = lilygo_app.csv
[env:view]
extends = base_config
; platform = https://github.com/platformio/platform-espressif32.git#feature/arduino-upstream
; platform_packages =
; framework-arduinoespressif32 @ https://github.com/espressif/arduino-esp32#master
board = esp32doit-devkit-v1
lib_deps =
${base_config.lib_deps}
build_flags =
${base_config.build_flags}
; Reduce loop task stack size (only works on newer IDF Arduino core)
; -DARDUINO_LOOP_STACK_SIZE=2048
; Modify the default unusable pin mask to allow GPIO 7 (allowed to use on ESP32-PICO-V3-02)
; Unusable bits: 6, 8, 9, 10, 20
; (0ULL | _FL_BIT(6) | _FL_BIT(8) | _FL_BIT(9) | _FL_BIT(10) | _FL_BIT(20))
-DFASTLED_UNUSABLE_PIN_MASK=0x100740LL
; 0~39 except from 24, 28~31 are valid
; (0xFFFFFFFFFFULL & ~(0ULL | _FL_BIT(24) | _FL_BIT(28) | _FL_BIT(29) | _FL_BIT(30) | _FL_BIT(31)))
-DSOC_GPIO_VALID_GPIO_MASK=0xFF0EFFFFFF
; GPIO >= 34 are input only
; (SOC_GPIO_VALID_GPIO_MASK & ~(0ULL | _FL_BIT(34) | _FL_BIT(35) | _FL_BIT(36) | _FL_BIT(37) | _FL_BIT(38) | _FL_BIT(39)))
-DSOC_GPIO_VALID_OUTPUT_GPIO_MASK=0x30EFFFFFF
[env:handheld_tdisplay]
extends = base_config
board = esp32doit-devkit-v1
lib_deps =
${base_config.lib_deps}
build_flags =
${base_config.build_flags}
Thanks for your interest in my problem
Andy
This is ancient. Your problem persists on 5.1.1?
Instead of this, write
monitor_eol = CRLF
monitor_echo = yes
build_type = debug
monitor_filters = esp32_exception_decoder
(see docs )
@maxgerhardt Sorry, I am really new to platformio
; PlatformIO Project Configuration File
;
; Build options: build flags, source filter
; Upload options: custom upload port, speed and extra flags
; Library options: dependencies, extra library storages
; Advanced options: extra scripting
;
; Please visit documentation for the other options and examples
; https://docs.platformio.org/page/projectconf.html
[platformio]
default_envs = view
[base_config]
platform = espressif32@5.1.1
framework = arduino
monitor_speed = 115200
monitor_eol = CRLF
monitor_echo = yes
build_type = debug
monitor_filters = esp32_exception_decoder
lib_deps =
build_flags =
-DCORE_DEBUG_LEVEL=ARDUHAL_LOG_LEVEL_DEBUG
;
; This line is required when using LILYGO® T-Micro32 Plus 8MB flash 2MB Psram ESP32
; to make use of the extended FLASH. Make sure you copy lilygo_app.csv from the root
; of this project to here:
; C:\Users\mail\.platformio\packages\framework-arduinoespressif32@3.10006.210326\tools\partitions
;
;board_build.partitions = lilygo_app.csv
[env:view]
extends = base_config
; platform = https://github.com/platformio/platform-espressif32.git#feature/arduino-upstream
; platform_packages =
; framework-arduinoespressif32 @ https://github.com/espressif/arduino-esp32#master
board = esp32doit-devkit-v1
lib_deps =
${base_config.lib_deps}
build_flags =
${base_config.build_flags}
; Reduce loop task stack size (only works on newer IDF Arduino core)
; -DARDUINO_LOOP_STACK_SIZE=2048
; Modify the default unusable pin mask to allow GPIO 7 (allowed to use on ESP32-PICO-V3-02)
; Unusable bits: 6, 8, 9, 10, 20
; (0ULL | _FL_BIT(6) | _FL_BIT(8) | _FL_BIT(9) | _FL_BIT(10) | _FL_BIT(20))
-DFASTLED_UNUSABLE_PIN_MASK=0x100740LL
; 0~39 except from 24, 28~31 are valid
; (0xFFFFFFFFFFULL & ~(0ULL | _FL_BIT(24) | _FL_BIT(28) | _FL_BIT(29) | _FL_BIT(30) | _FL_BIT(31)))
-DSOC_GPIO_VALID_GPIO_MASK=0xFF0EFFFFFF
; GPIO >= 34 are input only
; (SOC_GPIO_VALID_GPIO_MASK & ~(0ULL | _FL_BIT(34) | _FL_BIT(35) | _FL_BIT(36) | _FL_BIT(37) | _FL_BIT(38) | _FL_BIT(39)))
-DSOC_GPIO_VALID_OUTPUT_GPIO_MASK=0x30EFFFFFF
[env:handheld_tdisplay]
extends = base_config
board = esp32doit-devkit-v1
lib_deps =
${base_config.lib_deps}
build_flags =
${base_config.build_flags}
The code still crashes but gives marginally more information:
abort() was called at PC 0x400e112d on core 0
Backtrace:0x40083625:0x3ffbeacc |<-CORRUPTED
ELF file SHA256: 0000000000000000
Rebooting...
ets Jul 29 2019 12:21:46
rst:0xc (SW_CPU_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 271414342, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:2
load:0x3fff0030,len:1184
load:0x40078000,len:13132
load:0x40080400,len:3036
entry 0x400805e4
[0$$HH+QW«Y.\&¦KZX¶K,\],'¦LMW®Y](\]£¹equencyMhz(): PLL: 480 / 2 = 240 Mhz, APB: 80000000 Hz
andyfraser:
monitor_eol = CRLF
Output is the same when you comment out this line?
Your test firmware is minimal with only src/main.cpp as
#include <Arduino.h>
void setup() {}
void loop() {
for ( int i = 0 ; i < 10000 ; i++ )
{
delayMicroseconds( 1000 );
}
}
?
Is freeRTOS still a part of the problem?
@aussiesusan Yes, I suspect that it is down to FreeRTOS which is configured for a 1ms tick. I am not sure if FreeRTOS is working in pre-emptive or co-operative mode but in either case I would not expect a crash just that my timing goes all wonky if the task is switched out.
Andy
It’s pre-emptive. Your tasks will get interrupt by a timer. Further, if you don’t resume tasks for a prolonged period of times, the WiFi task will crash. But for short delays it should work to use critical sections .
If you can, try and push these timing requirements onto the hardware, not software. See if you can use a timer perpiheral and a quick ISR.
