I set the compiler to save the PSW and put it into source mode (4 byte frame) instead of binary. Now when I load my program into the dscope it has the correct ljmp instructions to my ISR's. I created an endless while loop(while(1);) in one of my subroutines(external code space). When I run my code to this location it gets there fine, but when an interrupt occurs I vector to the ISR and return to the code however when I return I do not actually execute any instructions or stop at any breakpoints set. The trace shows that I just run through all of my instructions until execution stops. One other thing I noticed that the display of the call stack shows a different address than what should be when an interrupt occurs. It seems to be off by 1 byte. Does this mean anything the interrupt seems to come and go alright when it hits when I am in my main routine (located in the same code segment as the ISR) But the stack addressing anomally applies.
Does anyone know what would cause the following: Interrupt returns to some new line of code that it puts into my source. My Code prior to interrupt address: FE002E ECALL stub2 FE0032 SJMP #115 ; this is while (1) loop forever After the interrupt occurs I have FE002E ECALL stub2 FE0030 RET FE0031 ??? 0xCE FE0032 SJMP #115 Simulator generates an invalid instruction at address FE0030 What is this new code and where did it come from Any ideas????
Are you sure about using HUGE memory model ? Which last instruction of your ISR and 'stub2' function: - RETI/RET or - ERET It seems like non-simmetrical stack pointer's manipulating. For example, ECALL to function which finished with RET (but should be ERET).
Select "Options/C251 compiler", Dialog "C251 Compiler Options": - page "Object": [X] Save PSW1 in C251 interrupt code - page "Memory model": Code size limits: "Huge:64K functions, 16mb program size" In "Command Line Options String" should be: ".... I2 ROM(Huge) ...."
Thanks Sergey, Right now I am trying to link a group of functions together at address FF4000H and I am using the linker but the linker causes an error on my PC (PC fault) and it shuts down when I enter a long string into the command line. ie ?PR?Myfunc1?Myfile(0FF4000),?PR?Myfunc2?Myfile, etc.... I have alot of functions. Does anyone know how I can work around this?????