Has anyone taken a look at TI's CC2560 or C1310 processors? They're both based on an a Cortex-M3 processor clocked up to 48 MHz and work in the 2.4 GHz and sub-1 GHz bands respectively. I haven't had a chance to read all the documentation yet but they appear similar to the CC2538, aside from one part, they both have a Cortex-M0 based "RF Core" softMAC supporting 802.15.4, 6lowpan, BLE, and ZigBee stacks..
Unfortunately, the datasheets state "The ARM Cortex-M0 processor is not programmable by customers." While this may mean that it's not possible to write a custom MAC or port RIOT's to the M0 these could still prove to be useful chips. The documentation states that an image for the softMAC is stored in an chip ROM but it does seem to be field upgradeable but I'm not clear if this is only possible by patching the image stored in ROM each boot or if the patch is permanent opening a potential avenue for custom M0 firmware. The documentation doesn't include complete register documentation for the M0 but it at least includes the names of the registers. I'm not sure if debug access is enabled on the M0 but I would be fairly surprised if it were. Both chips also contain a "sensor controller" CPU that can be configured to monitor various peripherals even while the main processor is in standby mode which sounds like a nice way to further reduce power consumption. I haven't had time to investigate how this processor is configured and programmed. Anyways, even if the embedded softMAC isn't user programmable these look like interesting chips. Seeing as they only cost US$29 I'll probably buy TI's CC2650 based "SensorTag"[1] dev platform and if I'm feeling especially adventurous give porting RIOT to it a try. --adam [1] www.ti.com/sensortag
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