drivers/aip31068: initialization fails in most cases when using esp_i2c_sw

[HendrikVE]

Description

There is a 80% chance that the initialization for the driver aip31068 fails when using esp_i2c_sw instead of esp_i2c_hw.

Steps to reproduce the issue

Remove the line USEMODULE += esp_i2c_hw fromaip31068/Makefile.dep and test with real hardware.

Reason for the failing initialization is this line:

RIOT/cpu/esp_common/periph/i2c_sw.c

Line 365 in 2079642

return -ENXIO;

Attachment

I used the logic analyzer software from saleae which is available here.
The attached zip-archive contains two files that can be imported to show all I2C operations for the esp_i2c_sw- and esp_i2c_hw-version of the driver. As you can see I had to reset my esp32 4 times before initialization was successful.

• esp32_aip31068.zip

[HendrikVE]

@gschorcht I thought a new issue is a better place to discuss this problem ;)

[gschorcht]

Where can I buy this hardware? Only at Aliexpress?

[HendrikVE]

I've got mine from dfrobot. This display combines the aip31068 with pca9633 in one component.

[gschorcht]

Ordered, it takes 1 to 3 days. Then I will have a look.

[HendrikVE]

Fixed with #17346