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
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
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