Multiple TWI-instances SDK 11

RE: Multiple TWI-instances SDK 11

Henrik — Tue, 07 Mar 2017 14:04:23 GMT

As far as I know TWI0 does not have fixed SDA and SCL pins, I believe they can be freely defined. However, it's been a while since I worked with SDK 11.

You can define SDA and SCL pins for a TWI-instance in two ways:

Go to nrf_drv_config.h and change the defines (TWI1_CONFIG_SCL and TWI1_CONFIG_SDA) to whatever you like (either in hexadecimal (0x19) or decimal (25). It doesn't matter).
Create a config, as you can see I did for my TWI instance 1. This will overwrite the values defined in nrf_drv_config.h as long as you apply the config to the nrf_drv_twi_init()-function.

RE: Multiple TWI-instances SDK 11

Akram Karimi — Tue, 07 Mar 2017 13:58:58 GMT

Thanks. TWI0 has fixed SDA and SCL pins(26 and 27) but how to configure any other pin to be used as SDA and SCL for TWI1?

RE: Multiple TWI-instances SDK 11

Henrik — Tue, 07 Mar 2017 13:56:03 GMT

They decide which pins you would like to use as SDA and SCL on the board. 0x infront of the number means that I have decided to define the pins in hexadecimal.

In this case I have chosen pin 25 as SCL and pin 24 as SDA. (For TWI 1)

RE: Multiple TWI-instances SDK 11

Akram Karimi — Tue, 07 Mar 2017 13:50:34 GMT

Dear Henrik, do you know what are TWI1_CONFIG_SCL and TWI1_CONFIG_SDA defines? What are they for? I have them as follows: #define TWI1_CONFIG_SCL 0 #define TWI1_CONFIG_SDA 1

While yours are different. I am using nRF52832 with SDK11. Looking forward to your help.

RE: Multiple TWI-instances SDK 11

bjorn-spockeli — Wed, 13 Apr 2016 12:26:40 GMT

Glad to hear that you were able to resolve the issue.

RE: Multiple TWI-instances SDK 11

Henrik — Wed, 13 Apr 2016 08:57:33 GMT

The issue has been resolved.

If you have the same issue, make sure to assign enough bytes for reading the TWI-data. If you have any more questions about this issue, feel free to contact me.