On Mon, 2010-12-13 at 14:14 +0000, zied130187 wrote:
> thank you suresh, i know this site.
> my problem not to config UART ,
> because my prgram work if i connect U1TX to U1RX,
> is not the problem of UART,
> but the problem is to communicate with LM400.

Zied,

Think about it, if your setup for UART0 is the same
as for UART1 then they will communicate with each
other but not with the LM400 module or a PC.

I would try to get the communication going with the
PC running minicom, both directions. And when that
works at 19200bd. connect the LM400 module.

roelof

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speed of uart not at all problem.ca u post what is your problem

exactly.i'll try to solve Start a New Thread

no need to calcute all those things.to communicate LM400

u need to send AT commands to LM400.

first u connect LM400 to lpc2129 like what i said previously.

and then if ur data tx function like

uart0puts()

then just send uart0puts("ATB?");

then receive response check it out Start a New Thread

#define baudrate (19200)
// PLL setup values are computed within the LPC include file
// It relies upon the following defines
#define FOSC (14745000) // Master Oscillator Freq.
#define PLL_MUL (4) // PLL Multiplier
#define CCLK (FOSC * PLL_MUL) // CPU Clock Freq.

// Pheripheral Bus Speed Divider
#define PBSD 2 // MUST BE 1, 2, or 4
#define PCLK (CCLK / PBSD) // Pheripheal Bus Clock Freq.
use these configurations and what ever the things previously i have sent

u will get the output.

first check with hyper terminal 19200 baudrate Start a New Thread

man u just come to online .i'll tell you how to communicate with LM400 Start a New Thread

--- In l..., Soori wrote:
>
> first u test uart communication with 19200 baudrate
>
> and then connect LM400 in swap mode means
>
> RX OF LM400->TX OF LPC2129
>
> TX OF LM400->RX OF LPC2129
>
> and then in program just send AT commands.
>
> Definately it will work
>
thank you for your response ,

i test UART1 with my config (normally the baud rate is 19200)
it work when i connect U1TX to U1RX,

i have measured the signal with scope,
i have found : 1 bit is send in 208 s.

how i can calculate the baud rate from this value ?

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first u test uart communication with 19200 baudrate

and then connect LM400 in swap mode means

RX OF LM400->TX OF LPC2129

TX OF LM400->RX OF LPC2129

and then in program just send AT commands.

Definately it will work Start a New Thread

thank you my friends !

it's work !!

i have receive \n\rOK\n\r :)&
thank you !
when i measure the value with scope i found the baud rate is 4800

i change the value in my code :

UART1Init(19200);

with

UART1Init(76800);

and it's work !!!

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----Original Message----
From: l...
[mailto:l...] On Behalf Of zied130187
Sent: 13 December 2010 15:38 To: l...
Subject: [lpc2000] Re: problem communication UART LPC2129
to LM400 bluetooth

>
> when i measure the value with scope i found the baud rate
> is 4800
>

I've lost count of the times this has happened to me.
I never believe a baud rate till I've seen it on the scope.

--
Tim Mitchell

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i have measured the value between first bit of first U byte
and the first bit of the second byte

the value is 2,5 ms

and the value of transmission of 1 bit is 208 s

how i can calculate the baud rate with this tow values ?

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