Working with long values Debugger and 32 - bit multiplys

DAN CLAPP

Prodigy 125 points

Other Parts Discussed in Thread: MSP430F5438

CCS 5.1, MSP430 compiler 4.01, MSP430F5438

I am having an issue with getting 32-bit muliply results out of the RES0, RES1... values.

The multiply appears to be correct. But when I start debugging and looking at long values

I can't see any correct values.

Here is a sample code I made that will not correctly show "results" or "test"

#include <stdio.h>
#include <msp430.h>

/*
* hello.c
*/
void main(void) {
        register unsigned long results = 0;
        unsigned int test;

        MPY32L = 86400UL & 0x0000FFFF;
        MPY32H = 86400UL >> 16;
        OP2L = 15401;
        OP2H = 0x0000;
        test = RES1;
        results = (unsigned long) RES1;
        results = (results<<16) | RES0;
}

Issues: No value is shown when I try and look at results or test.

I look at the RES values and they have the correct answer.

Is there some setting need to set in the compiler/debug options! This same code works in IAR.

I just started a new workspace, created a new project "hello world" and added this code with the "MSP430.h" include.

thanks

Dan

over 13 years ago

0 esc over 13 years ago

TI__Prodigy 210 points

This looks like a known issue where the debugger cannot correctly display variables larger than 16 bits which are stored in registers on MSPX devices. The tracking number for this issue is SDSCM00042242.

0 Joshua Einstein over 13 years ago in reply to esc

Intellectual 700 points

Pete-

Is there any news on this debugger problem yet? Working with ADC scaling and values is a real pain without the ability to view 32-bit variables, or even seeing it split across two 16-bit variables. I can actually get it to display the variable if I split it up, like in the code below, but the debugger is still not showing the upper 16bits correctly.

UINT32 temp;
 UINT16 t1;
 UINT16 t2;

temp = 0;

// Create temporary storage for 32-bit value to allow for scaling and ref voltage
 temp = *adcReading * (UINT32)(ADC_REFERENCE_VOLTAGE_VOLTS * scalingFactor);

t1 = 0xFFFF & temp;
 t2 = temp>>16;

temp = t1+t2;

Anyway, If there's a better way to deal with it, I'd love to hear it.

Thanks,

Josh E

0 esc over 13 years ago in reply to Joshua Einstein

TI__Prodigy 210 points

This particular issue should be fixed for CCSv5.2 with MSP430 CGT 4.1.1. If you haven't updated, could you update and let me know if you're still seeing a problem? (Note in some cases optimization still affects the accuracy of debug info, unrelated to this issue.)

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Working with long values Debugger and 32 - bit multiplys