Unable to use UART, i2c and SPI together.

RE: Unable to use UART, i2c and SPI together.

Nguyen Hoan Hoang — Fri, 26 Apr 2024 05:27:48 GMT

As I mentioned before uart2 & i2c2 & spi2 are shared devices. You can only select one. either uart2 and i2c1 or other combination but not both the same instance.

RE: Unable to use UART, i2c and SPI together.

Devendu R — Fri, 26 Apr 2024 05:20:51 GMT

I am using the NRF9160 and utilizing three UARTs. However, when attempting to enable I2C2, a conflict arises between UART2 and I2C2, as shown in the image. Could you please rectify why this is happening ?

RE: Unable to use UART, i2c and SPI together.

mattheis — Thu, 25 Apr 2024 12:34:52 GMT

You are correct. This is also what I was trying to communicate

My first reply might seem odd because it was written right after your reply, wasn't aware at the time of writing of your answer.

RE: Unable to use UART, i2c and SPI together.

Nguyen Hoan Hoang — Thu, 25 Apr 2024 12:31:44 GMT

You can't use all 3 but not on the same device instance. for example I2C instance 0, SPI instance 1 are possible but not I2C instance & SPI instance 0 at the same time.

See datasheet

RE: Unable to use UART, i2c and SPI together.

mattheis — Thu, 25 Apr 2024 12:29:42 GMT

It's definitely possible to use UART, I2C and SPI, but you have to consider that they might share memory locations.
So you can't use them at the same time if they share a memory location. Refer to the datasheet of the chip you're using to verify.

RE: Unable to use UART, i2c and SPI together.

Nguyen Hoan Hoang — Thu, 25 Apr 2024 12:28:59 GMT

Which SoC are you referring to ? On nRF52 series the I2C & SPI are shared. On nRF53 all 3 are probably shared. Which means if you use dev 0 of i2c, you cannot use device 0 of SPI.