Lpc2000

--- In lpc2000@yahoogroups.com, "Karl Olsen" <kro@...> wrote:
>
> ---- Original Message ----
> From: "Nice Guy" <mcmurtr@...>
> To: <lpc2000@yahoogroups.com>
> Sent: Saturday, March 11, 2006 8:11 PM
> Subject: [lpc2000] Can't Receive Data on UART0
> 
> > I have tried everything I can think of, but I can not receive data on
> > the UART.  I know the UART and all other hardware is good, because I
> > can program the part over the exact same setup.  All I want to do is
> > send anything I receive back out, Just emulate a loopback as a first
> > step.  I can send data out the uart all day long. Below is my code, I
> > must be doing something stupid.  VPB Clock is set the same as the PLL
> > clock. Thanks for any help.
> >
> > int main(void)
> > {
> > sysInit();                              // Init system stuff
> > uart0Init(9600, UART_8N1);
> > uart0Puts("UP!\n\r");
> > while(1)
> > {
> > uart0Putch(uart0Getch());
> > }
> > return(0);
> > }
> >
> > int uart0Init(int baud, int mode)
> > {
> > // clear needed pinsel bits and set to correct values
> > PINSEL0 &= ~(PINSEL_FUNC(3,1)|PINSEL_FUNC(3,0));
> > PINSEL0 |= PINSEL_FUNC(1,1) | PINSEL_FUNC(1,0);
> >
> > U0LCR = BIT7|mode;
> > U0DLL = ((XTAL * M_OSC) / (baud * 16)) & 0xFF;
> > U0DLM = (((XTAL * M_OSC) /(baud * 16)) >> 8) & 0xFF;
> > U0LCR &= ~BIT7;
> >
> > U0IER = 0x00;             // disable all interrupts
> > U0IIR = 0x00;             // clear interrupt ID register
> > U0LSR = 0x00;             // clear line status register
> > U0FCR = BIT2|BIT1|BIT0;
> > return(0);
> > }
> >
> > int uart0Putch(int ch)
> > {
> >  while (!(U0LSR & BIT5))          // wait for TX buffer to empty
> >    continue;                           // also either WDOG()
> >
> >  U0THR = (unsigned char)ch;  // put char to Transmit Holding Register
> >  return (unsigned char)ch;      // return char ("stdio-compatible"?)
> > }
> >
> > const char *uart0Puts(const char *string)
> > {
> > char ch;
> >
> > while ((ch = *string)) {
> > if (uart0Putch(ch)<0) break;
> > string++;
> > }
> >
> > return string;
> > }
> >
> > int uart0Getch(void)
> > {
> > if(U0LSR & BIT0)
> > return U0RBR;
> > return -1;
> > }
> 
> Most of the times you call uart0Getch(), no character is received,
and it 
> seems you then send 0xFF.  Is this intended?
> 
> Karl Olsen
>

Yeah, it's fine for now, I want to be able to hold a key down and see
it appear in the output stream. The 0xFF shows up as spaces in
hyperterminal.