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Original question:
TMS320F280049: Is call to Device_cal necessary for ADC offset trim configuration?
I've had some problems with Device_cal() changing the state of CPU registers (specifically XAR3) which the compiler is using to store automatic variables. From looking at the disassembly for Device_cal(), it doesn't appear to push CPU registers onto the stack. I'm calling it from in an initialisation function, so before interrupts are enabled.
My optimisation settings are O2 with optimise for speed = 2. The flags excluding include paths etc are: v28 -ml -mt --cla_support=cla2 --float_support=fpu32 --tmu_support=tmu0 --vcu_support=vcu0 -O2.
Do you have any recommendations on how to ensure that Device_cal() can be called safely from optimised code?
