Introduction

The Dragino MS12 has a SPI interface from Ar2317 which is already used for the Serial Flash. We use the GPIOs to simulate a second SPI interface and communicate with other SPI devices.

The GPIO defination while simulated as SPI interface:
GPIO0  <---> Reset
GPIO1  <---> MOSI
GPIO2  <---> MISO
GPIO3  <---> SCK

Send message to Arduino via SPI

example codes are available for download in http://www.dragino.com/downloads/examples/spi_incoming/