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Hi: I have a question to ask,that is how to enable and disable the interrupt in C environment on the DSK(CCS DSK C5000 1.22).I did as follows: #include <stdlib.h> #include <type.h> #include <board.h> #include <flash1.h> void main (void) { volatile unsigned int *ST1_REG1 = (volatile unsingned int *)0x07; volatile unsigned int *IMR_REG = (volatile unsigned int *)0x00; . . . *ST1_REG1 &= 0xf7ff; . . . } but the bit "INTM" could not be changed,while other registers could be changed ideally(through the register window).Why ? Please give me a answer as soon as possible ? Thank you very much ! --------------------------------- |
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INTTERRUPT IN C ENVIRONMENT
Started by ●February 25, 2004
Reply by ●February 25, 20042004-02-25
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liang mar wrote: > Hi: > I have a question to ask,that is how to enable and disable the interrupt in C environment on the DSK(CCS DSK C5000 1.22).I did as follows: > #include <stdlib.h> > #include <type.h> > #include <board.h> > #include <flash1.h> > void main (void) > { volatile unsigned int *ST1_REG1 = (volatile unsingned int *)0x07; > volatile unsigned int *IMR_REG = (volatile unsigned int *)0x00; > . > . > . > *ST1_REG1 &= 0xf7ff; > . > . > . > } > but the bit "INTM" could not be changed,while other registers could be changed ideally(through the register window).Why ? > Please give me a answer as soon as possible ? Thank you very much ! It may be that CCS generates the wrong code to make this work. I've never manipulated ST1 directly, I always use the opcodes. I would use the asm(); function from 'c' to set/clear the intm (and other) flags: Clear flag: asm(" RSBX INTM"); Set flag: asm(" SSBX INTM"); Brian -- ----------------- Brian C. Lane (W7BCL) Programmer www.shinemicro.com RF, DSP & Microcontroller Design |
