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Push/Pop 40-Bit registers

Question asked by ChristianH on Nov 18, 2014
Latest reply on Nov 19, 2014 by ChristianH

Hi,

 

I try to find a good way to save and restore 40-Bit register values (floating point in f0-f15) during an interrupt service routine.

 

My audio calculations are done in 40-Bit floating point, my SPI communicates with a microcontroller.

The SPI end interrupt is nested with the SPORT interrupt, so I have to save/restore some registers used in the SPI interrupt.

 

My internal memory is 48Bit code in block 1 and block2/3/4 is 32-Bit data.

Simple copy instructions or puts/gets on f0-f15 (or r0-r15??) are just saving upper 32-Bit of the 40-Bit values.

For status it's simple I think with push/pop sts.

 

I need 2-3 registers to be stored and recalled in 40-Bit.

 

Any ideas or proposals?

Thank you

Christian

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