Problems with the configuration the transceiver TRW-2.4G

Wireless & IoT
1

I’m having problems with the configuration of the transceivers.

I use the pic 16f876 for communicate with the transceivers trough a protocol SPI created by me (this protocol has been proved and it works).

The first prove that I want to do is to send a byte, so I configure one of them transceiver as a transmissor and the other as a receiver.

The configuration word of the transmissor is 08 08 00 00 00 00 00 00 00 00 00 00 23 4F 14. Once the circuit has been loaded we have to wait 100 ms, to put the transceiver in program mode (CE=0 and CS=1). After this we send the configuration Word and we put the transmisor in active mode (CE=1 y CS=0) sending 01 address and 31 data to the transceiver that we want to use as receiver and then we put it in stand by mode.

The second transceiver has the following configuration Word 08 08 00 00 00 00 01 00 00 00 00 01 23 4F 15 (as we can see the address of this transceiver is 01). After the configuration we put the receiver in active mode and the DR1 never gets active.

Please help me with this problem.

2

please somebody help me with my problem, I am 2 weeks trying to make the configuration and I do not obtain result

3

You could start trying to get some activity on the DR1 pin. So forget about the sender for a while and configure with no CRC. The noise that is picked up should make the DR1 active.

Have you verified the timing - for example

to put the transceiver in program mode (CE=0 and CS=1).

is not enough there should be a 5 microsecond delay before data is sent.

Also, the fastest possible SPI clock is I belive 1MHz (you need 500ns setup and hold time and also 500ns high time for the clock). What speed are you using?

/Lars

4

thank you very much by the answer, it makes the test as you said (without CRC) but does not activate the DR1 yet, I believe that the problem is in the configuration and I ask to you that you explain to me as you make the configuration.

the time that exists between the configuration and data send is more that 1 second and SPI protocol it is emulated and it has a frequency of 100kHz.

please help me with my problem.

5

what frequency is your PIC and can we see the code for the sending the config.

I cannot go though the config at the moment as it takes ages. But as soon as i get some time i will.

6

ric, I had a look at the configuration data and it looks ok.

is not enough there should be a 5 microsecond delay before data is sent.

I should clarify that - you need to wait 5 micros before sending the configuration data. Maybe you should be ok with this since your SPI clock is only 100KHz.

I agree with pittuck, show the code and maybe some PIC expert (I am not one) will spot some problem.

/Lars

7

thanks pittuck and lajon, now I send de code that I usin for configurate de transceiver.

list p=16f876

include<p16f876.inc>

org 0x00

goto inicio

org 0x04

goto inter

;///////////declaracion de variables//////////7777777

retar_20 equ 0x30

retar1_20 equ 0x31

retar equ 0x32

retar1 equ 0x33

retaro equ 0x34

retar1o equ 0x35

cont equ 0x36

temp1 equ 0x37

temp2 equ 0x38

var equ 0x39

veinte equ 0x3A

dato_raml equ 0x39

dato_ramh equ 0x3A

W_Temp equ 7Ch

Status_Temp equ 7Dh

PClatch_Temp equ 7Eh

FSR_Temp equ 7Fh

;configuracion de registros

inicio

call iniciar_puertos

call iniciar_perifericos

call iniciar_variables

goto principal

;programa principal

principal

call retardo_20

call retardo_20

call retardo_20

call retardo_20

call conf_RF

goto $

;/////////////////interrupciones/////////////

inter

movwf W_Temp

swapf STATUS,w

clrf STATUS ;guarda STATUS

movwf Status_Temp

movf PCLATH,w

movwf PClatch_Temp ;guarda PCLATH

clrf PCLATH

movf FSR,w

movwf FSR_Temp ;guarda FSR

;///////////////////verifica a q interrupcion ir//////////////

btfsc INTCON,INTF ;ve si es la interrupcion externa

goto interext ;va a la interrupcion externa

;//////////////////salida de las interrupciones///////////

fininter

movf FSR_Temp,w

movwf FSR ;reestablece FSR

movf PClatch_Temp,w

movwf PCLATH ;restablece PCLATH

swapf Status_Temp,w

movwf STATUS

swapf W_Temp,f

swapf W_Temp,w ;restablece w

retfie

;////////////////////////interrupcion externa////////////////

interext

bcf INTCON,INTF

bsf PORTA,3 ;habilita CE

bcf PORTA,4 ;limpia CS

nop

movlw 0xAA

call env_spi

movlw 0xBB

call env_spi

movlw 0xCC

call env_spi

movlw 0xDD

call env_spi

movlw 0xEE

call env_spi ;manda la direccion

movlw 0x31

call env_spi

movlw 0x32

call env_spi

movlw 0x33

call env_spi

movlw 0x34

call env_spi ;manda el dato

bcf PORTA,3 ;limpia CE

bcf PORTA,4 ;limpia CS

goto fininter

;/////////////////////rituna q inicializa los puertos/////////////////////

iniciar_puertos

bcf STATUS, RP0 ;va al banco 0

clrf PORTA

clrf PORTB

clrf PORTC

;clrf PORTD

;clrf PORTE

bsf STATUS, RP0 ;va al banco 1

movlw b’00000111’ ;RA0,RA1,RA2,RA3,RA4,RA5,RE0,RE1,RE2 digitales

movwf ADCON1 ;Mover el valor al registro

movlw b’00000100’ ;0,1,2,3 entradas 4 salida

movwf TRISA

movlw b’00000001’ ;0,1,2,3 entradas 4,5,6,7 salidas

movwf TRISB

movlw b’10011011’ ;0,1,2,3,4,5,6 salidas 7 entrada

movwf TRISC

;movlw b’00000000’ ;0,1,2,3,4,5,6,7 salidas entrada

;movwf TRISD

;movlw b’00000000’ ;0,1,2,3,4,5,6,7 salidas entrada

;movwf TRISE

bcf STATUS,RP0

return

;/////////////////////rituna q inicializa los perifericos/////////////////////

iniciar_perifericos

bsf STATUS,RP0 ;seleccion del banco 1

movlw b’00100000’

movwf PIE1 ;permiso de interrupciones para el T1 y T2

movlw b’00110011’

movwf SPBRG ;indica q la transmision serial se realiza a 9600 baudios

bsf TXSTA,TXEN

bsf TXSTA,BRGH

bcf STATUS,RP0 ;va al banco 0

movlw b’11010000’

movwf INTCON

bsf RCSTA,CREN

bsf RCSTA,SPEN

clrf STATUS

clrf PIR1

clrf PIR2

return

;/////////////////////rituna q inicializa las variables/////////////////////

iniciar_variables

bcf STATUS,RP0 ;va al banco 0

movlw 0x0A

movwf retar1

movlw 0x03

movwf retar

clrf temp1

clrf temp2

clrf cont

clrf var

clrf veinte

bcf PORTA,3

bcf PORTA,1

clrf dato_raml

clrf dato_ramh

return

;///////////////////////rutina de transmision serial///////////

enviar

movwf TXREG

bcf PIR1,TXIF

bsf STATUS,RP0

bcf STATUS,RP1

fintx

btfss TXSTA,TRMT

goto fintx

bcf STATUS,RP0

bcf STATUS,RP1

retardo_mas

decfsz retar

goto retardo_mas

movlw 0x03

movwf retar

decfsz retar1

goto retardo_mas

movlw 0x0A

movwf retar1

return

;///////////////////retardo de 20ms/////////7

retardo_20

retardo22

decfsz retar_20

goto retardo22

movlw 0xFF

movwf retar_20

decfsz retar1_20

goto retardo22

movlw 0x50

movwf retar1_20

return

;///////////////////retardo de 5ms/////////7

retardo_5

retardoo

decfsz retaro

goto retardoo

movlw 0xFF

movwf retaro

decfsz retar1o

goto retardoo

movlw 0x02

movwf retar1o

return

;/////////////////////////espera q llegue dato spi//////////

esp_spi

movlw 0x08

movwf temp2 ;Inicializa el contador

nop

nop

nop

nop

bck_spi

bsf PORTA,1 ;coloca reloj en estado alto

bsf STATUS,C

btfss PORTA,2 ;Copia el valor del dato en el carry

bcf STATUS,C

nop

nop

nop

nop

bcf PORTA,1 ;coloca reloj en estado bajo

rlf temp1,f ;Para guardarlo en el temporal

decfsz temp2,f ;Comprobamos el contador, para ver si hemos recibido los 8 bits

goto bck_spi ;Si no, se repite el ciclo

movf temp1,w

call enviar

return

;////////////////////enviar dato spi////////

env_spi

movwf temp1 ;Salva el byte a transmitir en el registro temporal ‘temp1’

movlw 0x08

movwf temp2 ;Inicializa el contador

vuelve_spi

bsf PORTA,0 ;coloca dati en 1

btfss temp1,7 ;Comprueba el bit

bcf PORTA,0 ;y lo coloca la salida en 0 si el dato es 0

nop ;Envia el bit

nop

bsf PORTA,1

nop ;Da un pulso de reloj

nop

nop

nop

bcf PORTA,1

nop

rlf temp1,f ;Rotamos a la izquierda ‘temp1’

decfsz temp2,f ;Comprobamos el contador, para ver si hemos enviado los 8 bits

goto vuelve_spi ;Si no se repite el ciclo

bcf PORTA,0

return

;/////////////////////////7configura en trw 24g////////////////////

conf_RF

bcf PORTA,3 ;limpia CE

bsf PORTA,4 ;habilita CS

nop

movlw 0x00

call env_spi

movlw 0x20

call env_spi

movlw 0x00

call env_spi

movlw 0x00

call env_spi

movlw 0x00

call env_spi

movlw 0x00

call env_spi

movlw 0x00

call env_spi

movlw 0xAA

call env_spi

movlw 0xBB

call env_spi

movlw 0xCC

call env_spi

movlw 0xDD

call env_spi

movlw 0xEE

call env_spi

movlw 0xA2

call env_spi

movlw 0x4C

call env_spi

movlw 0x04

call env_spi

bcf PORTA,3 ;limpia CE

bcf PORTA,4 ;limpia CS

return

;/////////////////////////////incluye la libreria/////////////////////////////

end

that is de code please someone help me with my problem I apreeciate so much your colaboration.

8

somebody exists that programs pic in assembler and has handled trw-2.5g, please help me I have been a month trying that this transceiver works

9

ric:
somebody exists that programs pic in assembler and has handled trw-2.5g, please help me I have been a month trying that this transceiver works

Hello ric, Excuseme for me english by is not my native languaje.

i am not a pic assembler expert. I programming pic in C languaje. I have a pic 16f876 and connected to TRF-2.4 sucessful.

Pic16f876 is 5 volt and module TRF 2.4 is 3.6 volt max.

How is your interface? my interface is with volt divider resistor from pic to TRF and direct from TRF to Pic.

From power 5 volt i used 1 diode 1N4007 to pic (pin 20) and 2 diode from pic (pic 20) to TRF 2.4G.