TWI/I2C with SDK 11 (long transfers)

RE: TWI/I2C with SDK 11 (long transfers)

bg2bkk — Wed, 16 Nov 2016 05:07:46 GMT

Hi，Arnaud, I change uint8_t to uint16_t but it seems to not work properly. I change all the related length in file nrf_drv_twi.c in SDK11，So what wrong with me ?

RE: TWI/I2C with SDK 11 (long transfers)

Arnaud Nelissen — Sun, 17 Jan 2016 11:13:54 GMT

Thank you, I got it to work by, as you said, changing uint8_t length related attributes to uint16_t !

RE: TWI/I2C with SDK 11 (long transfers)

Øyvind Karlsen — Mon, 11 Jan 2016 14:53:41 GMT

Hi,

Right you are. In this case I think your best bet is to use the old driver from SDK 10. Hopefully it is not too complicated to port or alternately you can use SDK 10. The reason the new driver now only supports 255 bytes per transaction in order to be compliant with the 255 bytes per transaction limit on the EasyDMA. If you are using nRF51 you may be able to fix your problem by changing the length parameter from uint8_t to uint16_t as nRF51 does not have EasyDMA for TWI.

TWI slaves can have trouble recieving multiple start signals, this may be what is causing your error.

Best regards,

Øyvind