Two SPI and one I2C master on nRF51

[mstanisz]

Hi,

I have a custom board someone designed with two SPI masters and one I2C master.  We're now trying to enable the second SPI master and I'm running into errors because you cannot enable SPI1 when TW1 is enabled.

So the simple question is can I use two SPI masters and one I2C master on the nRF51422 simultaneously?  I'm afraid I know my answer already :-/

Best,
Matt

[Jørgen Holmefjord]

Hi,

Unfortunately, it is not possible to use two SPI intances and one TWI instance simultaneously on nRF51 series. The serial instances share the same base address. It is possible to use alle three, but you will have to switch between them (disable one SPI to enable TWI, etc).

Best regards,
Jørgen

[mstanisz]

Hey Jørgen,

Thanks, I appreciate it.  I was afraid of that.  Another thought I had was running SPI0 out two sets of SPI pins.  Is that possible?  I'm guessing not, but worth a shot.

Also, do you have a sample of switching between SPI ports?  All the config is in the initial nrf_drv_config.h, so I wasn't sure how to actively switch ports once it's initialized.

Best,

Matt