The code I gave was quite complete.
here is some uart code; for ease of use it is not interrupt driven.
This is FAR more simpler than an i2c slave.
a few more LOC are needed for a main() that calls initialization methods,
set pin directions, and globally enable interrupts
you also need a DEFINE_INT..... as described in sdcc documentation.
Sebastien.
//-------------------------------------------------------------------------------------------
//initialize the serial port
void ser_setup()
{
//configure the serial port
TXSTAbits.SYNC = 0; //asynchronous mode
RCSTAbits.SPEN = 1; //enable serial port
RCSTAbits.CREN = 1; //enable receiver
TRISCbits.TRISC6 = 0; //set txd as output
TRISCbits.TRISC7 = 1; //set rxd as input
TXSTAbits.BRGH = 1; //baud = fosc/(16(X+1)) X=(fosc/(16bauds))-1
SPBRG = ...;
}
//-------------------------------------------------------------------------------------------
//Transmit a byte.
void ser_putchar(char car)
{
TXREG = car;
TXSTAbits.TXEN=1; //enable transmission
//Wait for completion
while(TXSTAbits.TRMT==0);
}
//-------------------------------------------------------------------------------------------
//read a byte
char ser_getchar()
{
//wait until something is received
while(PIR1bits.RCIF==0);
return RCREG;
}
tested to work perfectly on pic18f452 and pic18f2620, will also probably
work for other.
You just have to calculate proper BRGH value to get the correct baud rate
Sebastien
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