I2C device gets detected with Adafruit Bootloader but fails with Nordic SDK

RE: I2C device gets detected with Adafruit Bootloader but fails with Nordic SDK

Mojo — Fri, 09 Aug 2019 20:29:42 GMT

Try this driver. It works much better. We used it in all our projects.

https://github.com/IOsonata/IOsonata/blob/master/ARM/Nordic/src/i2c_nrf5x.cpp

RE: I2C device gets detected with Adafruit Bootloader but fails with Nordic SDK

Jørgen Holmefjord — Fri, 09 Aug 2019 09:02:36 GMT

Which SDK version are you testing with?

Did you check the GPIO voltage on both firmwares?

The PN7150 that you connect to, is this some kind of development kit/breakout board? In that case, can you provide a link?

Is the device designed for running at 3 V, without any level converters, etc?

RE: I2C device gets detected with Adafruit Bootloader but fails with Nordic SDK

shockline — Thu, 08 Aug 2019 11:50:01 GMT

I am running it on nrf52840-DK.
Yes, I measured the GPIO voltage and it was 2.96V.
For I2C communication I use P0.27 and P0.26. I use the same pins in both the examples.

RE: I2C device gets detected with Adafruit Bootloader but fails with Nordic SDK

Jørgen Holmefjord — Thu, 08 Aug 2019 09:16:08 GMT

Hi,

Which board are you running this on? An nRF52840-DK, an Adafruit board, or a custom board?
Which voltage level do you supply the chip with? Have you measured the voltage on the GPIOs?
Which GPIOs do you use to connect the I2C device? Are you using the same pins in both examples?

Best regards,
Jørgen

RE: I2C device gets detected with Adafruit Bootloader but fails with Nordic SDK

Turbo J — Wed, 07 Aug 2019 19:03:11 GMT

That is the point I'd take out the DSO (digital storage oscilloscope) and measure the actual I²C bus lines.

Note that I²C are 7-bit and used in either shifted form.
This could bite you here: NRF uses the right shifted addresses in the hardware (address in bits 6..0 without the R/W bit).