NRF51822 + S110 problem with I2C to (MPU9150)

RE: NRF51822 + S110 problem with I2C to (MPU9150)

tim — Mon, 15 Sep 2014 20:03:34 GMT

I have TWI hw master working with SHORTS, please let me know if that works for you.

RE: NRF51822 + S110 problem with I2C to (MPU9150)

danielZ — Wed, 03 Sep 2014 15:10:26 GMT

nope, that doesn't seem to be the problem. tried to change the read/write commands as well.

the strangest thing is that the SW example doesn't work as well. and Its not a problem with the sensor as it works perfectly with RFduino

RE: NRF51822 + S110 problem with I2C to (MPU9150)

Stefan Birnir Sverrisson — Thu, 28 Aug 2014 06:10:06 GMT

The current TWI master example in the SDK has some issues when used with a softdevice. Most likely the issue is that the TWI hardware driver uses the PPI module directly, without going through the SoftDevice API's. When the SoftDevice is enabled this will not work. I have attached a file that my colleague made that should work better with the softdevice. It is a modified version of the sd_twi_hw_master.c found in the

twi_hw_master_sd.c