Motorola USB08 - Manual (Page 115)

Source Code Files
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USB08 Evaluation Board Designer Reference Manual
MOTOROLA Source Code Files 115
//----------------------------------------------------------------------------
char getSSCI() {
char c;
unsigned char n;
unsigned char ccr_save;
// ccr_save = getCCR(); // save current Interrupt Mask
// disableINTR(); // disable Interrupts
while(tstRxLvl()!=0) ; // wait for H-L transition
delayHalfBit();
n=8;
do { // get 8 Databits
delayBitTime();
c >>= 1;
if(tstRxLvl()!=0)
c |= 0x80;
} while(--n);
delayBitTime();
if(tstRxLvl()==0) { // check Rx Line during Stopbit
// add framing error
// handling if desired
}
delayHalfBit();
// setCCR(ccr_save); // restore previous Interrupt Mask
return c;
}
//============================================================================