DMA ADC Read Failed On Connection to AP when in WiFi STA (station) mode (IDFGH-2168)

[wammaw1314]

My problem is basically the same as #3714, but there are some supplements.

Environment

• Development Kit: ESP32-DevKitC
• Module or chip used: ESP32-WROOM-32
• IDF version (run git describe --tags to find it):
  v4.1-dev-815-ga45e998-dirty
• Build System: Make
• Compiler version (run xtensa-esp32-elf-gcc --version to find it):
  xtensa-esp32-elf-gcc (crosstool-NG esp32-2019r1) 8.2.0
• Operating System: Linux
• Power Supply: USB

Problem Description

When acquiring ADC data through DMA transfers and the device is in station mode (WIFI_MODE_STA). As the device connects to the AP, the ADC DMA buffer ceases to show valid data and continues to read (a probably random) fixed value.
I experimented with #3714 and added this line of code during WiFi initialization: esp_wifi_set_ps(WIFI_PS_NONE);

Get the following results:

1. The DMA ADC can read the normal value without restarting the device.
2. After executing esp_restart();, the device DMA ADC is read only as a zero value.
3. If the device is reset by resetting the IO via ESP32, the result is normal.

Code to reproduce this issue

The full code
Copy your ESP_IDF example structure:
examples\peripherals\i2s_adc_dac\main\app_main.c
and replace everything in app_main.c with this:
app_main.zip

Debug Logs

Program running debugging log is as follows:
I2S-DMA-ADC-WiFi-Reboot-log.txt

I hope to get your help, thank you !

[negativekelvin]

Did you see the comment #3973 (comment) ?

[wammaw1314]

@negativekelvin Thanks, I saw it. I am using the latest master branch, so now I have to wait for the fix to be ready, right?

[negativekelvin]

Right

[koobest]

@wammaw1314
The patch to solve this issue has been added to the master branch, please help test it :)
(https://github.com/espressif/esp-idf/blob/master/components/bootloader_support/src/bootloader_random.c)

thanks !!

[negativekelvin]

ba72de2

[original-standard]

I'm in the same situation with the bluetooth connection.
Can the WIFI_PS_NONE mode help with my problem?

[tom-borcin]

Hi @wammaw1314,

we think the issue is fixed now and therefore we are closing it to keep our backlog manageable. If you don't agree with this decision, please let me know.

Thank you,

Tomas