Serial ports on the SA1100 (cont’d)

// some register pointers

struct sp_regs * sp1 = (struct sp_regs *)SP1_BASE;

struct ppc_regs * ppc = (struct ppc_regs *)PPC_BASE;

unsigned * gpdr = (unsigned *)GP_PIN_DIR;

unsigned * gafr = (unsigned *)GP_PIN_AFR;

unsigned bdr = serialGetBaudRateDivisor( 9600 );

int i, oldcount;

count = 0;

IrqSetup();

Install_Handler( (unsigned)Serial_Handler, (unsigned *)IRQ_VECTOR );

CleanDcache();

DisableIRQ( IRQ_UART0 );

printf( "Serial Test Program\n" );

// enable serial port 1 in PPC (see 11-184 in Developer Manual)

ppc->ppfr &= 0xFFFFCFFF; // disable PPC control of serial port 1 (11-192)

// the board uses the UART redirected to GPIO 14-15, so we also need to

// take care of that

ppc->ppar |= 0x00001000; // enable serial port 1 redirection (11-189)

*gafr |= 0x0000C000; // set pins 14-15

*gpdr |= 0x00004000; // set bit 14

*gpdr &= 0xFFFF7FFF; // clear bit 15