Transfer data over SPI asynchronous in mbed on nRF51DK

RE: Transfer data over SPI asynchronous in mbed on nRF51DK

arneme — Wed, 13 Apr 2016 06:53:44 GMT

Cool, I managed to get it working now reading NMEA data from a GTOP Firefly X1 GPS over the SPI interface.

RE: Transfer data over SPI asynchronous in mbed on nRF51DK

Hung Bui — Tue, 12 Apr 2016 11:50:43 GMT

You can use native code (access SPI register directly). I can find some examples for mbed doing SPI on nRF51: https://developer.mbed.org/teams/RedBearLab/code/SPI_Demo_nRF51822/?platform=RedBearLab-nRF51822

RE: Transfer data over SPI asynchronous in mbed on nRF51DK

arneme — Tue, 12 Apr 2016 09:55:37 GMT

So what are my options then? I am trying to read NMEA data from an external GTOP Firefly X1 GPS chip. This chip has a 255 bytes large transfer buffer that I need to read from. Is it possible to include "native" nrf51DK SPI code in an mbed online compiler project? Do I have to export to a offline toolchain (e.g. GCC-ARM) and include "native" nrf51DK SPI code in the exported project? Do I have to abandon mbed and do a full "native" (bare metal or using rtx or freetos OS)?

RE: Transfer data over SPI asynchronous in mbed on nRF51DK

Hung Bui — Tue, 12 Apr 2016 09:09:33 GMT

Hi Arneme,

No, it's not supported on nRF51 yet. Also we don't have DMA for SPI master on nRF51. For nRF52, we may support but I don't know when.

Looking at this, seems that only SiliconLabs' chips supporting this.