Posted on July 09, 2004 at 10:25 Hi,
I'm building an SCI receiver with an ST72F264G2. But it doesn't work.
It's an 250kBAUD 1startbit + 8databits + 2stopbits serial protocol
The interrupt routine is called, but the SCIDR does not contain the right data.
Here is the code (summarised):
void main(void)
{
int tel, tel2;
int rood, blauw, groen;
unsigned char *ER=(unsigned char *)0x1020;
PADDR=0xef; //1 1 1 0 1 1 1 1
PAOR=0xef; //1 1 1 0 1 1 1 1
PBDDR=0xff;
PBOR=0xff;
ClrBit(PADDR,5); //input
ClrBit(PAOR,5); //input
SCIBRR = 0x01; //0000 0001 SCI Baudrate Register
SCICR1 = 0x10; //0001 0000 SCI Control Register1
SCICR2 = 0x24; //0010 0100 SCI Control Register2
rood = 0;
groen = 0;
blauw = 0;
datagroen = 0;
datablauw = 0;
datarood = 0;
startkanaal = 0;
aantaldata = 0;
DMX_OK = 0;
_asm(''rim'');
while(1){
SPI_master(datablauw, datarood);
}// end while(0)
}//End void main(void)
@interrupt void UART_RX(void)
{
if (ValBit(SCISR,RDRF)) //
{
if (ValBit(SCISR,NF)) // Noise?
{
DMX_OK = 0;
t = SCIDR;
}
else if (ValBit(SCISR,FE))
{
if (SCIDR == 0) // break?
{
ontvangstkanaal = 0;
DMX_OK = 1;
}
else
{
t = SCIDR;
DMX_OK = 0;
}
}
else
{
if (ontvangstkanaal == 511)
DMX_OK = 0;
if (!ValBit(SCICR1,T
) DMX_OK = 0;
if (DMX_OK == 1)
{
if (ontvangstkanaal == DMX_kanaal) datarood = SCIDR; if (ontvangstkanaal == DMX_kanaal+1)
datagroen = SCIDR; if (ontvangstkanaal == DMX_kanaal+2)
datablauw = SCIDR;
}
ontvangstkanaal++; }
}
t = SCIDR; // 2de stap voor reset
}
