I2C Communication nRF52-DK and ESP32

RE: I2C Communication nRF52-DK and ESP32

Vidar Berg — Thu, 10 Mar 2022 14:50:14 GMT

Maybe I'm misunderstanding something, but an i2c slave does not have the ability to initiate a transfer. I guess you could try to switch roles.

RE: I2C Communication nRF52-DK and ESP32

pgonzaleztrucorp — Thu, 10 Mar 2022 14:47:28 GMT

ESP32 is acting as the slave sending data. nRF52 is the master receiving (by request) the data.

I don't have any logic analyzer.

I know the problem is the nRF52, probably incompatible with the libraries I'm using.

What I'm trying to do is send data, I don't care how, do you know any other way you can help me with?

RE: I2C Communication nRF52-DK and ESP32

Vidar Berg — Thu, 10 Mar 2022 14:36:32 GMT

It's seems to be the other way around when I look at the code you posted. The esp is using 'WireSlave' and the nrf is using 'WireSlaveRequest'. Either way, this would be much easier to troubleshoot if you had a logic analyzer you could use.

RE: I2C Communication nRF52-DK and ESP32

pgonzaleztrucorp — Thu, 10 Mar 2022 13:55:10 GMT

It's the ESP32 the one sending data, it works if I connect it to another ESP32. The only difference is that I can't use the same function as the ESP32 receiver that uses "Wire.begin(SDA_PIN,SCL_PIN)"

If I don't connect ESP32 and nRF52 the nRF52 says "slave not found" so it's correct.

If I connect ESP32 and nRF52, the nRF52 stops working.

If I connect them and reset the ESP32, it enters on a resetting loop.

I'm also using the BLE of nRF52832, can this be an issue?

Maybe there's a better way to do this...

RE: I2C Communication nRF52-DK and ESP32

Vidar Berg — Thu, 10 Mar 2022 13:36:45 GMT

Hello,

I can't see any obvious mistakes, but I'm not familiar with the ESP32 codebase, nor the arduino code you use on the 52, so that may be why. Apart from the errors on errors shown on boot, does the esp program appear to run ok, or does it go enter a reset loop because of the errors?

You should also connect a logic analyzer or scope to the i2c lines to see if the nrf sends the data as expected, and whether this data gets acked by the esp or not.

Best regards,

Vidar