ESP32 and I2C CAL component Problem/Observation

[dvcam99]

Hello FC Team,

today I made the follwing observation with my ESP32 and using I2C CAL component.

First of all the I2C CAL is only bringing data in Software mode on the I2C bus. Hardware mode either Ch1 or Ch2 will not bring any data on the bus. Unfortunately the clock rate is wrong in software mode with approx 400Hz.
Please see the follwing scope screen shoot.

esp32 lcd backpack 100khz i2c soft.png (164.68 KiB) Viewed 64 times

The I2C CAL component was set to 100Khz

If I use as a comparision LCD back pack I2C component I`ll get the correct clock rate.
Please see the next picture.

esp32 lcd backpack 100khz i2c.png (172.49 KiB) Viewed 64 times

So the question si what is wrong with I2C opperation at ESP32?

May somebody has dicovered a similar behaivior.

BR
Dirk

[mnfisher]

Have used the i2c quite extensively in the past without issue - so unless a recent update has broken something?

Can you post your chart?

Martin

[dvcam99]

Hi Martin,


fc file attached. In between I´ll checked I2C master component and I2C CAL component. Same result. Running only in software mode not hardware. Clock frequency approx 500Hz.

ESP_32_I2C_Test_1_0.fcfx

(8.55 KiB) Downloaded 4 times

BR

Dirk

[BenR]

Hi Dirk,

I2c only works in transaction mode for esp32 hardware channels. Same for arm. I'll have a look at your program and see if I can transfer it to transaction mode for you.

[dvcam99]

....transaction OK. Yes a example would be cool too.

In between I´ll checked the transaction hardware. Great it is working with the correct clock frequency.

Picture and FC file below:

esp32 lcd backpack 100khz i2c transaction.png (156.44 KiB) Viewed 37 times

ESP_32_I2C_Test_1_0.fcfx

(8.91 KiB) Downloaded 3 times

BR

Dirk