Hi everyone
I am usinng the NXP KL43L256Z4 Cortex M0+, compiler MDK-ARM uVision V5.25.2
When I am in a breakpoint, I change any register value (ex. R6 = 0xFFFFFF), in the next step the Stackpointer R13(SP), gets always the 0xFFFFFFFC value, does not matter where point in the program it is.
Current values:
R13(SP) = 0x1FFFE460 R0 = 0X000000
Breakpoint CPSID I ; Mask interrupts LDR R0, =SystemInit BLX R0
Here I insert into R0, 0XFFFFFF
in this moment the SP become: R13(SP) = 0x1FFFFFFC
Somebody saw somthing like it? It is a KEIL error?
Firstly thank you.
The point it is, when I change the value maunaly in any register from R0 to R12 (it is part of my software tests...), the Stack pointer change yours value to 0x00FFFFFFC.
The SP should never change its value when writing in another register! The stack is adequately large, and I have only one break point.
No matter what point of the code I am, any line that I am debugging when I write in a registry manualy, I get this error.
The code compile correcty, without other faults. Now I will try to use the current Keil version for test, but the version that I have is safety certificate.
Any background tasks, or DMA occuring?
Not sufficiently familiar with the NXP part, but does it suspend timers, watchdogs, etc in debug state?
Using a uLink? J-LINK?
If you continue to have issues open a ticket with Keil, or with your NXP FAE.