Lpc2000

--- In lpc2000@yahoogroups.com, "jesperkr123" <jk@t...> wrote:
Hey 

Well I solved my problem... I calculated a wrong divisor.

unsigned int divisor = pCF / (16 * baud); //Works in Keil, but not GNU

should be:

unsigned int divisor =  (int)(((FOSC*PLL_M/VPBDIV_VAL) / ((baud) * 
16.0)) + 0.5); // Works in GNU
  
Jesper



> Hey
> 
> Thanks for the hint, but it did'nt work... I still got problems...
> 
> Jesper
> 
> --- In lpc2000@yahoogroups.com, "javida13" <javida13@y...> wrote:
> > You need to encapsulate UODLL and DODLM by setting and clearing 
the 
> > DLAB
> > 
> >  U0LCR |= 0x80;           /* Set DLAB */
> >  U0DLL = divisor;
> >  U0DLM = (divisor>>8);
> >  U0LCR &= ~0x80;          /* Clear DLAB */
> > 
> > 
> > > my PC, the received byte is wrong.
> > > This is my test program:
> > > 
> > > void SetUART(int baud){
> > >   unsigned int divisor = pCF / (16 * baud);
> > >   
> > >   PINSEL0 |= 0x00050005;     /* Enable UART0 & UART1            
*/
> > >   
> > >   U0IER = 0x00;                         // disable all 
interrupts
> > >   U0IIR;                                // clear interrupt ID
> > >   U0RBR;                                // clear receive 
register
> > >   U0LSR;                                // clear line status 
> > register
> > >   
> > >   U0LCR = 0x83;        /* 8 bits, no Parity, 1 Stop bit, 
DLAB=1*/
> > >   U0DLL = divisor;
> > >   U0DLM = (divisor >> 8);
> > >   U0LCR = 0x03;       /* DLAB = 0 - no access to UART1 Div.  */
> > >   U0IER = 1;
> > >   
> > >   U1LCR = 0x83;            /* 8 bits, no Parity, 1 Stop bit, 
> > DLAB=1*/
> > >   U1DLL = divisor;
> > >   U1DLM = (divisor >> 8);
> > >   U1LCR = 0x03;
> > >   U1IER = 1;  
> > >   
> > >   U0FCR = 0x07;			//enable the FIFO's
> > >   U1FCR = 0x07;			//enable the FIFO's
> > > }
> > > 
> > > void __attribute__ ((interrupt("IRQ"))) tc0(void) {
> > >   timeval--; 
> > >   T0_IR       = 1;                            // Clear 
interrupt 
> > flag
> > >   VICVectAddr = 0;                            // Acknowledge 
> > Interrupt
> > > }
> > > 
> > > void __attribute__ ((interrupt("IRQ"))) u0(void) {
> > >   putcha(U0RBR); 
> > >   U0IIR;	
> > >   VICVectAddr = 0;
> > > }
> > > 
> > > void __attribute__ ((interrupt("IRQ"))) u1(void) {
> > >   status |= (1<<UART_1);
> > >   dummy = U1RBR;	
> > >   U1IIR;	
> > >   VICVectAddr = 0;                            // Acknowledge 
> > Interrupt
> > > }
> > > 
> > > void setInterrupt(void)
> > >   {
> > >   enableIRQ();
> > >  
> > >   VICIntEnClear = ~0x000000d0;		 
> > >   VICIntSelect &= ~0x000000d0; 
> > >   VICIntEnable = 0x000000d0;
> > >   VICVectAddr0 = (unsigned long)tc0;         
> > >   VICVectCntl0 = 0x20 | TIM0;                
> > >   VICVectAddr1 = (unsigned long)u0;          
> > >   VICVectCntl1 = 0x20 | UART_0;              
> > >   VICVectAddr2 = (unsigned long)u1;          
> > >   VICVectCntl2 = 0x20 | UART_1;              
> > >   }
> > > 
> > > void init(void)
> > >   {
> > >   systemInit();
> > >   ledInit();
> > >   setInterrupt();
> > >   SetUART(9600);
> > >   }
> > > 
> > > char putcha(char ch)
> > >   {
> > >   while (!(U0LSR & 0x20));
> > >   return(U0THR=ch);
> > >   }
> > > 
> > > int main (void) {
> > > init();
> > > while(1)
> > >   {	  
> > > 	  if (IOPIN0 & (1<<SWPIN))
> > > 	    {}
> > > 	  else
> > > 	    putcha(0x30);  	  
> > >   }
> > > }
> > > When I run this code, I receive 0x63 on my PC?? Any 
> suggestions ?? 
> > > What am I missing...
> > > I've tested the board with the Keil CHARM compiler, with 
> > succes..... 
> > > Almost the same code....
> > > 
> > > Regards
> > > Jesper Kristensen
> > > Denmark