BTStack on MSP430 Value Line
David Cox
Matthias Ringwald
While not impossible, it is very close to that.
The crucial values are RAM and Flash. The msp430g2553 has 16 kB Flash and 512 B RAM. The init script of the PAN1326 with BLE enabled already has 10 kB, so there's only 6 kB left. BTstack uses something in the order of 32 kB for a full SPP implementation. Only BLE should be lower but not soo much.
RAM: the packet buffers for RX and TX are 256 bytes each. That consumes all RAM on the value line chip. You may do some ugly cross-layer optimization (merge command generation with the UART TX driver) and reduce the TX buffer to around 30 bytes.
Hm.. I guess it's not impossible but it won't be pretty. I've seen a Bluetooth stack which doesn't use rx/tx buffers running on an ATmega128, but even that one actually had 4 kB of RAM.
Even though it requires the IAR compiler, maybe the TI CC2540 might be easier to use in this scenario.
Best
Matthias
On Mar 1, 2012, at 7:49 AM, David Cox wrote:
> How possible do you think it would be to get a stripped down version of BTStack running on a MSP430g2553 (http://www.ti.com/product/msp430g2553)? I'm hoping to be able to connect a Panasonic module - PAN1326 (http://www.panasonic.com/industrial/electronic-components/rf-modules/bluetooth/pan1326-1316.aspx) and utilize the Low-Energy capabilities of the module, stack, and microprocessor.
>
> Any thoughts on how feasible this is? Anyone doing any work of this sort?
>
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