MSP430 Interrupts/Status Register

try twice...

Hello to all,

I have to programm a TI MSP430 in Forth. My problem is, that I'm not able to write in the status register or in IE1. I can write in other control registers like the ADC12CTL1 e.g. but i can't handle the interrupts.

I'm using the following forth code to call the command "DINT":

code /DisableInt DINT RET end-code

It also dosn't work when I'm using

code /DisableInt

And there is no fault or problem when I want to write anything to IE1. There's just no change in IE1 after writing.

Does anybody knows what's my mistake? What do I have to attend before writing to IE1 or before using the DINT-Command?

Thank you,

Chris

please see my second topic....

I'm sorry.

Chris

My Forth assembly is a little rusty, but it appears you are ANDing the immediate value 8 with the ADDRESS of SR. Thus, there is an argument missing for BIC.B, which requires a bit number and a register address.

Regardless, are you trying to use this word inside an interrupt handler? SR might be being restored to whatever its contents were before the interrupt was taken when RETI is called, overwriting your change...

--Gene

Hi,

Thank you. The problem is that GIE is set to "0" only in the code structure. After "END-CODE" it is reset to "1". It's set to "1" if there's no "RET", too. Do you know a solution for my problem? Is there any other possibility for writing to SR without Assembler?

kind regards,

Chris

There's a couple of possibilities: There may be a variant form of END-CODE, that does not attempt to restore the status register. If not, you could write your own. Disassemble END-CODE, remove the code that is restoring SR, and create END-CODE-NO-SR, or whatever. There is likely a word for register access that can be called to modify SR without using CODE.

--Gene