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Because the CC2538 has a multi-byte SPI RX FIFO, flushing the buffer requires more than just a single read. This adds a loop that empties the entire RX buffer on a FLUSH(). Different SPI chips needs different SPI settings. This commit adds a function that allows chip drivers to configure the SPI peripheral before using it. The frame pin the driver was using as a chip select does not work as most devices expect it to. It toggles after every byte, and most chips interpret that as end of message. To make drivers more reliable, each chip driver should setup a GPIO and assert it as needed.
The Contiki Operating System
Contiki is an open source operating system that runs on tiny low-power microcontrollers and makes it possible to develop applications that make efficient use of the hardware while providing standardized low-power wireless communication for a range of hardware platforms.
Contiki is used in numerous commercial and non-commercial systems, such as city sound monitoring, street lights, networked electrical power meters, industrial monitoring, radiation monitoring, construction site monitoring, alarm systems, remote house monitoring, and so on.
For more information, see the Contiki website: