Lpc2000

--- In lpc2000@yahoogroups.com, "jstamos111" <jstamos111@...> wrote:
>
> Hey all,
> 
> I am trying to get UART0 output to display on hyperterminal for a 
> board I made based on the LPC2106 processor.  I use the ISP and 
> UART0 to program the board with Philips flash utility, then start 
> hyperterminal with the following settings: 9600 bits/second, 8 
> databits, no parity, 1 stop bit, and no flow control.  I set 
> hyperterminal to listen on the same com port as the one I used to 
> program the flash memory.  I also have the computer's com port 
> connected to the LPC2106's same UART (UART0?) that I used to 
program 
> the flash memory.  Finally, I hit reset, but the output is not 
> displayed in hyperterminal.
> 
> Any thoughts on why I am not seeing any output in hyperterminal?
> 
> Here is my code which I compiled uvision by keil tools.  I pretty 
> much stole this code from hitex's book for the philips LPC 
> processors.
> 
> void UART0 (void)	
> {
> PINSEL0 = 0x05; 	// Select TxD and RxD on pin connect block
> U0LCR = 0x80;		//Enable programming of divisor latches
> 
> U0DLL = 0xC2;		//Program the divisor latch for 19200 baud
> U0DLM = 0x00;
> 
> U0LCR = 0x33;		//Program the line control 8\N\1
> U0FCR = 0x4F;		//enable the FIFO's
> 			
> }
> 
> int main() {
> 	UART0();
> 
> 	printf("Hello World\n"); //Call the printf function
>         while(1) {}
>         return 0;
> }
> 
> Much Thanks.
> - John
>
John,

There are only a few places for this not to work.  Look at rxd and 
txd pins (with a scope) at cpu and determine if you have any signals. 
If you have signals check the bit time - you can use 'A' (0x55) for 
its bit pattern. Check both TX and RX.  If you don't have signals use 
putc(0x55) in a while loop or better yet, write directly to the TX 
data register. If that works then there may be config problem with 
the character write routine used by printf.  

Ian