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enquiry about Bluetopia MSP430 limitation

Other Parts Discussed in Thread: CC2564MODN, MSP430F5659

Hi, I'm quite new to MSP430.

In my project I use MSP430F5659 + CC2564MODN with a custom board, and I'm working with SPP profile to send data.(with MCLK 16Mz)

I have to send data every 2ms(500 per 1 sec) so I created custom function and scheduled to run every 1ms.(check every 1ms, if data is ready->send,

if not->don't to guarantee 500/s data rate)

Actually It worked quite well but not perfect.

I noticed that somehow the scheduled function does not run every 1ms.

Sometimes the scheduled function skips 2-3ms without running.

I checked with oscilloscope making an I/O pin goes low before/after the task.

I'm guessing it is because of some bluetooth related interrupt task takes more than 1ms to be executed.

Is this the limitation of MSP430 computing speed?

Or my guess is wrong that I can fix this issue changing some code or settings.

Any comment will be helpful. thanks.