Hi
I use an ESP32-S3, I2C and SPi.
IO4: I2C_INT
IO5: SDA
IO6: SCL
IO7: SPI_CS
IO16: SPI_INT
IO11: MOSI
IO12: SCK
IO13: MISO
There is several periphery connected to I2C and a W5500 to SPI.
The order in the code is:
Initialize SPI master
Initialize I2C master
Initialize I2C peripheral
So far, it's working.
As soon as the W5500 gets initialized, I can see a glitch high -> low -> high on the SDA signal.
After that glitch, SDA won't react anymore. It just stays high. I2C becomse unusable.
I checked my code several times and beside of I2C initialization, IO5 is not touched at all.
The same code worked fine with another pin mux.
Is there a limitation in io mux or gpio matrix which doesn't allow this configuration?
I'm lost at the moment.
Thank you very much.
Can't use I2C and SPI at the same time
Re: Can't use I2C and SPI at the same time
I used a 100R resistor and current meter to tie SDA to ground. I measured 25mA. That means the pin is active driven. I measured all pins of my ESP32-S3 module against SDA. None is connected to it.
Re: Can't use I2C and SPI at the same time
I found the problem, is is related to the w5500 code.
I didn't explicit set the RST pin to no pin.
There seems to be a default pin which colided with my i2c.
After setting the RST pin explicit to "-1" it's working.
I didn't explicit set the RST pin to no pin.
There seems to be a default pin which colided with my i2c.
After setting the RST pin explicit to "-1" it's working.
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