Debuuging SCI RDRF bit in Codewarrior

ve3id — Tue, 15 Nov 2011 00:12:25 GMT

I am trying to debug the following code...

void getSCI(void)           // get modem's response and display on lcd
{
    line = 1;
    temp = 0;
    char_Pos = 0;
    first_reply =1;

while(1)
{
    while ((SCI1SR1 & 0x20) == 0){};          // wait until received data
    temp = SCI1DRL;

etc....

If I put a breakpoint at the entry to getSCI(), when it stops there I can see the RDRF bit set in SCI1SR1 and the correct data in SCI1DRL. But if I single-step (either C or assembly) as soon as I move off the line=1 line, the RDRF bit clears, and when I get to the test for it, it obviously is not thee to test.

I assume this s because the debugger is reading the registers ahead of the execution steps, but how can I stop this?

Any help appreciated, this is a side issue to the real problem I am debugging!

regards,

Nigel Johnson

Re: Debuuging SCI RDRF bit in Codewarrior

kef — Tue, 15 Nov 2011 13:00:02 GMT

You should make sure data or memory windows do not include SCI or SPI registers, else flags of these modules may get cleared and your code will skip receive enents.

topic Re: Debuuging SCI RDRF bit in Codewarrior in S12 / MagniV Microcontrollers

Debuuging SCI RDRF bit in Codewarrior

Re: Debuuging SCI RDRF bit in Codewarrior