trouble with S12XS128 SCI controller

SOS — Tue, 07 Apr 2009 17:10:45 GMT

Hi everybody,

i have a situation with DEMO9S12XSFAME SCI interface.i'm developing an uart driver based on interrupts.When Debuging the module i've realized that during interrupt execution Flags ;either TDRE or RDRF are automatically reset by just getting the status register address .On the other hand when exiting the ISR the program fails and the debugger indicates ILLEGAL BP.

#if(Du16DUart_eController1Used)
void __near vDUart_iSci1_Isr(void)
{
   volatile void    *pvReg;
   volatile void    *pvReg1;
   volatile void   *pvReg2;
   TstDUart_iScisr1RegBits     stTmp;

   pvReg = (void *)(Ctu16DUart_iCtlBaseAdr[Ceu16DUart_eCtl0]+ Du16DUart_iSciSr1ROffset);          //Get Status register 1 address   : ALL FLAGS ARE RESET !!!!!!!!!!!!!!!
   pvReg1 = (void *)(Ctu16DUart_iCtlBaseAdr[Ceu16DUart_eCtl1]+ Du16DUart_iScidrlROffset);              //Get data low register address
   pvReg2 = (void *)(Ctu16DUart_iCtlBaseAdr[Ceu16DUart_eCtl1]+ Du16DUart_iSciCr2ROffset);

if ( ((*((TstDUart_iScisr1RegBits *)pvReg)).bTDRE) > 0 )
   {
        treating and writing to SCIDRL;
   }

if(((*((TstDUart_iScisr1RegBits *)pvReg)).bRDRF) > 0 )
   {
       treating and reading SCIDRL;
   }

}

Re: trouble with S12XS128 SCI controller

SOS — Thu, 09 Apr 2009 14:52:15 GMT

Ok rigth if no one is answering i'm gonna tell you that for the second point "programm fails when exiting

the ISR" i've disassembled the source file and i've realized that ISR dosen't end with the famous RTI

instruction cause i've forgot to put "__interrupt" at the begining when declaring the routine so as

Codewarrior could recognize it as an ISR. Now the problem i'm facing is that soft is unable to

resetTDREflag.Once TDRE is set the ISR is turning in loop.i've really followed the steps listed in

Datasheet which

are: reading SCI Status register and then writing to SCI Data Low register so i wish that anyone

could tell me what to do.

S12 / MagniV MicrocontrollersのトピックRe: trouble with S12XS128 SCI controller

trouble with S12XS128 SCI controller

Re: trouble with S12XS128 SCI controller