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[b]majestrix wrote:[/b]
[quote]Hi Dariog,
I have been working on the RF part last few days.. and tried to configure it so that i'm sure abut the frequency i'm transmitting. So i wrote a function to do that.. following is a part of it. 
in this part i'm just trynig to configure the baud rate -same thing i'm repeating for the frequency. but it's not sucessful for what ever reason. not even setting the baud rate part.. :( (i'm lighting up RB5 if sucess, but it dosent light up)
so i would like to know if my prob is with the way i'm trying to read from the TRS.. i tried with buffer = getcUSART(); (where buffer is a char variable) initially in a for loop (i have commenterd it out now, pls have a look at the code below.). or my whole aproach..
I also tried with getsUSART( buffer, 9); (where buffer is a srting array of 9).. but this dosent seem to work either.. i tried this coz datasheet doset specify how the echo is.. or does it matter..??
sorry this is a very lengthy post.. but i'm working like a blind man now. totall stuck. could you pls help me out. may be le me know how u are doing, i'll work from there.
and thanks for the help. :)

//here is the function i wrote..
void RFinitialize(){
char cmdBaud[] = "ER_CMD#U4"; //19200 baud
char cmdFreq[] = "ER_CMD#C7"; //434MHz
char buffer[9];
int sucess =1;
int i;

// open USART with baud of 19200 for 20MHz
OpenUSART(USART_RX_INT_OFF & USART_TX_INT_OFF & USART_ASYNCH_MODE &
USART_NINE_BIT & USART_CONT_RX & USART_BRGH_LOW,38);

baudUSART(BAUD_8_BIT_RATE & BAUD_WAKEUP_OFF & BAUD_AUTO_OFF);

SPBRGH=0;

//sending first configuration command to the RF module
	while(PORTBbits.RB0==1){} //checking to see if trs is busy
	putrsUSART("ER_CMD#U4");
 	while(BusyUSART());
	Delay1KTCYx(600); //delay of abut 30mS at 20MHz oscillation
					  //at least 20 mS required by the RF unit

PORTBbits.RB5=1; //sending the host ready
	while(!DataRdyUSART()) {} // see if there ia ny data
		
                getsUSART( buffer, 9); //try to read the echo from the trs

for(i=0; i<9; i++){
                // while(!DataRdyUSART()) {}
	//buffer = getcUSART();
	      if(buffer[i] != cmdBaud[i]){
	           sucess = 0;
	        }
	}
	PORTBbits.RB5=0; //host ready disables
	Delay1KTCYx(600);
		if(sucess == 1){
			while(PORTBbits.RB0==1){} //checking for busy
			putrsUSART("ACK");
			while(BusyUSART());
                                                PORTBbits.RB5=1; //checking to see if it was sucess
		}//first command send sucessfully

Delay1KTCYx(1000); //a delay to reduce the complication in the
						  //USART speed
//end sending first command
} // i have cut short the function just to show one sending event.. omitted the frequency setting bit which is basically a copy of this bit..

thanks a lot.

Hasan[/quote]

Topic History of: problem setting the EUART speed
Max. showing the last posts - (Last post first)

Author	Message
majestrix	Hello Dariog, yeah, i connected the module to PC, configured it and put it back to my device. and i guess it stores the configuration if u dont alter it, right..?? actaully i wanted to do it every time i boot the device too, coz in case something goes wrong with the setting.. but so far no problems. well i guess i didnt need to remove the trailing bits after all.. i as well tried with the configuration software in the LPRS site (i guess its just a fancy terminal program). well it configures wheather u use it or terminal as far as i'm concerned. phew.. thanks. Hasan
dariog	ok, I'm happy then ! As for the configuration... you mean that you set the configuration using a PC and then connect the Radio to your USB device? I , on the other hand, do set the parameters at boot, every time... Should be ok in both cases. Actually, I didn't even care that you could store configuration into the LPRS ! Ah, you did not have to remove the trailing "zeros" then?
majestrix	Hi Dariog, well it seems like we are having two different datasheets after all.. anyhow i checked with hostready pin HI today and was able to implement the link.. for configuration i'm directly connecting to PC with a MAX232 and configuring it.. not the best solution, but as long as it works right..? thanks for the help man. Hasan
dariog	majestrix wrote: Well, it looks fairly similar to me too. i mean ur method and the way i was doing it. may be the prob is created by the null string then..? yeah, I hope so also i see that in ur RECEIVE_DATA fuction u have LATBbits.LATB0=0; (which i believe is setting the "host ready" signal) but what i undestood from the datasheet hostready pin of the transceiver has to be put to Hi to receive data. but you are putting it to LO.. did i get something wrong here, or that line is code is not what i'm assuming it to be (host ready)? oh, well, on page 2 of 10 of a datasheet named "easyradio ER900FHTRS 1-4 Iss 1-3 April 2003" I see that you have to pull dat pin down in ordr to have LPRS transmitting out its bytes. But I saw many flavours of that datasheet so maybe you've got a different one. The one I trusted more (though I don't remember any contradiction, just less clarity among the datasheets) says that LPRS goes "Busy Output" when has gotten enough bytes to send on the air, and that Host REady is low when the Host is Ready to receive from LPRS. and one other thing.. in the RECEIVE_DATA func, i see u are returning i (a local variable to the func), but when u are calling u are just calling as RECEIVE_DATA(myBuf,9); i couldnt really figure out what that i does. it merely returns the #of chars read, so it's a kind of confirmation (that I don't even use, at the time...) one more qn... I dont see you checking the echo; if it actaully echored the right characters., are u using the fast ack method..? that sending 0x06 as ACK.. No, I'm not using FAST-ACK. I simply ignore the return value... at the moment.
majestrix	Hi Dariog, Thanks for the reply... Well, it looks fairly similar to me too. i mean ur method and the way i was doing it. may be the prob is created by the null string then..? also i see that in ur RECEIVE_DATA fuction u have LATBbits.LATB0=0; (which i believe is setting the "host ready" signal) but what i undestood from the datasheet hostready pin of the transceiver has to be put to Hi to receive data. but you are putting it to LO.. did i get something wrong here, or that line is code is not what i'm assuming it to be (host ready)? and i'm not questionang ur method, but just curious and one other thing.. in the RECEIVE_DATA func, i see u are returning i (a local variable to the func), but when u are calling u are just calling as RECEIVE_DATA(myBuf,9); i couldnt really figure out what that i does. one more qn... I dont see you checking the echo; if it actaully echored the right characters., are u using the fast ack method..? that sending 0x06 as ACK.. thanks for ur help. Hasan
majestrix	Hi Dariog, Thanks for the reply... Well, it looks fairly similar to me too. i mean ur method and the way i was doing it. may be the prob is created by the null string then..? also i see that in ur RECEIVE_DATA fuction u have LATBbits.LATB0=0; (which i believe is setting the "host ready" signal) but what i undestood from the datasheet hostready pin of the transceiver has to be put to Hi to receive data. but you are putting it to LO.. did i get something wrong here, or that line is code is not what i'm assuming it to be (host ready)? and i'm not questionang ur method, but just curious and one other thing.. in the RECEIVE_DATA func, i see u are returning i (a local variable to the func), but when u are calling u are just calling as RECEIVE_DATA(myBuf,9); i couldnt really figure out what that i does. one more qn... I dont see you checking the echo; if it actaully echored the right characters., are u using the fast ack method..? that sending 0x06 as ACK.. thanks for ur help. Hasan

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