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Coffee is placed by default at the beginning of the flash memory, right before the firmware. This avoids the memory gaps that there could be before and after Coffee if it were placed after the firmware, because it is unlikely that the end of the firmware is aligned with a flash page boundary, and the CCA is not flash-page-aligned. Thanks to that, Coffee is also always in the same flash area if its size remains unchanged, even if the firmware changes, which makes it possible to keep the Coffee files when reprogramming the firmware after a partial flash erase command. The default configuration of Coffee is set to use sensible values for a typical usage on this SoC, i.e. for sensor data logging. The default size of Coffee is set to 0 in order not to waste flash if Coffee is unused. COFFEE_CONF_CUSTOM_PORT can be defined to a header file to be used with "#include" in order to override the default CC2538 port of Coffee. This makes it possible to use Coffee with an external memory device rather than with the internal flash memory, without having to alter the Contiki files. Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau.dev@gmail.com>
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: