Transfer data over SPI asynchronous in mbed on nRF51DK

[arneme]

I am trying to read data from SPI slave on the nRF51DK using mbed online compiler. To do this the mbed SPI library (class) includes a method called transfer. When I try to use this method I get a compile error indicating that the transfer method does not exist. This is due to the fact that the nRF51DK device.h file does not set the DEVICE_SPI_ASYNCH flag (i.e. #define DEVICE_SPI_ASYNCH 1). Is there a reason for this? I would expect the nRF51DK to support this but that might not be the case? If not, will nRF52 support this?

[Hung Bui]

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.

[Hung Bui]

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