UART1 ON LPC-2468 Olimex Board SOLVED

Development Boards MicroMod
1

Hi All,

I’m trying to read from UART1 and write the output to the UART0.

I’m able to write to UART0 but when I try to write the content of U1RBR I’m=

getting 0x0 !

using my logic analyser I can see that there is data in the RXD1 pin , but =

neither the ISR

handler or reading roughly from the U1RBR works.

here is my setting code :

PINSEL0 = 0x00000001 // enable RxD1

ULCR = 0x83;

Fdiv = (Fpclk / 16) / baudrate

U1DLM= Fdiv / 256

U1DLL = Fdiv % 250

U1LCR = 0x03

U1FCR = 0x07

U1IER=1

Reading :

while(U1LSR & 0x01)

return U1RBR

I’m using the same config for the UART0 and it works.

I think I’m missing some thing in the UART1 setup !

Please any Idea

Z.Nakrachi

2

Well I finally found the problem, the Olimex board uses RXD1 and TXD1 on ports P2[0] and P[1] respectively. this was not mentioned in the datasheet (olimex), so the PINSEL4 must be set to 0x0000000A in order to use the UART1 over the UEXT.

So I just want to recall (if someone is experiencing the same problem) to double check the board schematics before configuring pins !!

mia culpa =)

hope it helps

Z. Nakrachi