Using both TWI instances in nrf51822

RE: Using both TWI instances in nrf51822

RK — Tue, 31 Mar 2015 10:29:39 GMT

It would be pretty wasteful to copy the source, change it to use the other TWI and then have both in your binary. Much better would be to follow the example of the SPI master and edit the code to pass in an instance parameter which you supply to each call. It's not a particularly difficult thing to do.

RE: Using both TWI instances in nrf51822

Bouke — Tue, 31 Mar 2015 07:32:23 GMT

As to your second question: yes, the usages of TWI0 and TWI1 are exactly the same. So copying the source and adapting it for TWI0 (with a different set of pins of course) should work.

RE: Using both TWI instances in nrf51822

Krzysztof Chruscinski — Tue, 31 Mar 2015 07:06:51 GMT

Yes, twi_hw_master is quite limited but multi-instance driver with blocking and non-blocking mode is coming soon - next SDK release.

For now you need to do as Charles suggested or tweak implementation on your own.

RE: Using both TWI instances in nrf51822

Charles Manning — Tue, 31 Mar 2015 03:40:58 GMT

Assuming you do not need to access devices on both TWI buses simultaneously, you could set up the TWI to access one bus, then change the pin muxing to access the other bus when you need to.

I did this with the UART and have 3 serial ports going: two for accessing peripherals and one for outputting debug info.