RE: nRF52833 TWI function as Slave

Kenneth — Tue, 11 Oct 2022 08:37:44 GMT

Hi,

First of all you should look at the instantiation table in the nRF52833 datasheet:
https://infocenter.nordicsemi.com/topic/ps_nrf52833/memory.html#topic

You can see from the table that some hardware peripheral share base address, for instance:

This means that if you use TWIM0 master to connect to sensors, then you can't use SPI0, SPIM0, SPIS0, TWI0, TWIS0.

So if you need a TWIS slave, then I suggest to use TWIS1 for slave, note that you can't use SPI1, SPIM1, SPIS1, TWI1, TWIM1 then.

There is no dependency between TWIM0 and TWIS1, so you just configure TWIM0 using 2 pins and TWIS1 using 2 other pins.

There is one example in the nRF5 SDK that setup both TWI Master and TWI slave, the example is used to demonstrate communication between TWI Master and TWI Slave by emulating an I2C EEPROM:
https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.1.0/twi_master_with_twis_slave_example.html

But you should be able to look at the example as reference on how to setup TWIM and TWIS.

Kenneth