LAUNCHXL-F28027F: General Purpose registers available to user in C2000 series

Ishaan Kubba

Part Number: LAUNCHXL-F28027F

When a gpio is used as an input, it samples the data on it pin and saves it in a 'boolean' data type in memory. This memory access time is large which slows down the max rate at which data can be sampled at a gpio. Is there any internal CPU register available to store data available on gpio without accessing the memory. I am assuming writes to internal CPU register are faster than writes to memory. Currently i am using picolo 28027F. Please suggest me some other c2000 mcu which has this availability of general purpose internal register.

over 8 years ago

0 Chen Jiang ti over 8 years ago

TI__Genius 15935 points

Hi Ishaan,

Thank you for your post. Your thread has been assigned to a C2000 expert and should be answered soon.

Best regards,
Chen

0 Cody Watkins over 8 years ago

TI__Mastermind 42195 points

Ishaan,

How are you reading the GPIOs?

Why are you polling the GPIO, could you setup XINTx to avoid polling this GPIO?

Regards,
Cody

0 Ishaan Kubba over 8 years ago in reply to Cody Watkins

TI__Prodigy 20 points

Reading of GPIO is in response to a timer interrupt in an ISR. My problem is, after this timer interrupt, when i go to service the ISR i store the value on the GPIO on a bool data type in memory. Since, memory access time is much slower than the internal register access time, i am taking too long to complete the ISR. Hence i need to save this value on GPIO into an internal register instead of a variable in memory.

I am not aware how to to that.

0 Whitney Dewey over 8 years ago in reply to Ishaan Kubba

TI__Guru 54205 points

Hello,

Where is the GPIO status variable stored? How are you profiling the memory access/determining that it's taking too long?

Whitney

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LAUNCHXL-F28027F: General Purpose registers available to user in C2000 series