Introduce new useful GPIO macros to:
- read the levels of some port pins,
- write the levels of some port pins (pass bit-field value to be set),
- clear the interrupt flags for some port pins.
These macros are cleaner and less error prone than raw register access code
copied all over the place.
Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
The parameters in the GPIO macros were used without being parenthesized. This
could generate wrong values for register assignments in the case of expressions
passed as arguments to these macros.
Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
This uses the core/dev/spi.h header and implements the spi_init()
function and the various macros for SPI operation. ssi.h contains all of
the register locations and information.
This implementation is not very versatile, mostly because I don't how to
make it flexible in the contiki system. It supports pin muxing for the
four spi pins, but other than that picks sensible defaults.
The SPI macros (like SPI_READ()) are defined in
cpu/cc2538/spi-arch.h. In order to use the SPI driver, add the following
includes to your project:
#include "spi-arch.h
#include "dev/spi.h"
