topic Re: Code Warrior Not Recognising CPU Registers in ISR in Kinetis Microcontrollers

Code Warrior Not Recognising CPU Registers in ISR

benjames — Tue, 08 Apr 2014 04:22:46 GMT

I am developing a HAL for a university project on the Kinetis K70 tower modue.

I am using Codewarrior 10.4 and have written the following ISR for the supervisor call to set the code to privelliged mode..

void isrSVCint(void)

{

uint32_t control;

uint32_t * controlPtr;

control = 0x00000000;

controlPtr = &control;

asm("LDR R1,[controlPtr,0]");

asm("MSR CONTROL, R1");

}

The second ASM line is throwing an "unknown identifier: R1" error.

The previous line accept R1 without issue, so I am wondering what is occuring here...

I think I have probably missed something fairly basic here, Please advise...

Ben

Re: Code Warrior Not Recognising CPU Registers in ISR

Kan_Li — Wed, 09 Apr 2014 06:49:55 GMT

Hi Ben James,

I think there is some asm syntax issue in your code, please kindly use the following code instead.

uint32_t control;

int main(void)

{

int counter = 0;

control = 0x00000000;

asm("LDR R7,=control\n\t");

asm("MSR CONTROL, R7");

for(;;) {

counter++;

}

return 0;

}

Hope that helps,

Have a great day,
Kan

-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------