TMS320F28032: Reading GP input from assembly

Part Number: TMS320F28032

Hello,

To perform a test of an input in assembly, I made this code

MOVW    DP,#_GpioDataRegs.GPADAT.bit.GPIO20
MOV        AL,@_GpioDataRegs.GPADAT.bit.GPIO20
ANDB       AL,#0x0010
SB           JUMP_ZERO,EQ

This code works, but test all GpioDataRegs.GPADAT inputs not only GPIO20 as i wrote (similar to C write) without any build errors. This is why I made 0x0010 for testing instead of 0x1 to test GpioDataRegs.GPADAT.bit.GPIO20. perhaps I do a mistake.

Could you please help me, i found lot of SET and CLR examples but nothing about reading/testing an input in assembler.

Thanks for your help,

Regards

over 3 years ago

0 Whitney Dewey over 3 years ago

TI__Guru 50575 points

That is expected. The assembly tools are able to get the appropriate DP and @ offset values for you based off the GpioDataRegs.GPADAT.bit.GPIO20 symbol, but the MOV instruction is still only capable of doing a 16 bit move of the contents of that location--it doesn't have the ability to do the bit masking itself. You will still need to use the additional ANDB instruction for that.

Whitney

0 ol over 3 years ago in reply to Whitney Dewey

Intellectual 470 points

thanks for your answer.

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TMS320F28032: Reading GP input from assembly