Communication of TRW-24G RF modules with AT90S2313 microcontroller
Communicate 2 TRW-24G RF modules (2.4GHz) with AVR microcontroller. This is more an example assembly code and not an intergraded electronic circuit.
Designed by: Serasidis Vasilis
Link: http://www.serasidis.gr/circuits/TRW-24G_t...ransceivers.htm
Introduction
My first attempt with RF modules was with TLP and RLP418 modules. Those modules working at 418 MHz with slow data-rate (typical 4.8 kbits/sec) and every module is transmit or receive only. TLP418 is only transmitting data and RLP418 module is only receive data. You can not make a bi-directional communication with only one couple of this modules. The solution of this problem is the use of TRW-24G transceiver modules (transceiver = transmitter + receiver). This modules working at 2.4 GHz frequency with GFSK modulation, and the data-rate is 250Kbps and 1Mbps (1 mega bit/second!)
TRW-24G Specification
- Frequency Range: 2.4~2.524 GHz ISM band
- Modulate Mode: GFSK
- Data Rate: 1Mbps; 250Kbps
- Multi channel operation: 125 channels, Channel switching time<200uS, Support frequency hopping
- Emulated full duplex RF link due to the 1Mbits/s on the air data rate
- Simultaneous dual receiver
- Data slicer / clock recovery of data
- Including decoder, encoder and data buffer and CRC computation
- ShockBurst mode for ultra-low power operation and relaxed MCU performance
- Sensitivity: -90dBm
- Built in antenna
- Power supply range: 1.9 to 3.6 V
- Low supply current (TX), typical 10.5mA peak@ -5dBm output power
- Low supply current (RX), typical18mA peak in receive mode
- Supply current in Power Down Mode: 1 uA
- Operating Temperature: -40~+85 Centigrade
- Size: 20.5*36.5*2.4mm
- 100% RF tested
- Competitive price
Applications
- Wireless mouse, keyboard, joystick
- Wireless data communication
- Alarm and security systems
- Home automation
- Wireless Earphone
- Telemetry
- Surveillance
- Automotive
First of all I would like to say that the TRW-24G connector pins are too small (~1mm pin to pin). For that I order the adaptor PCB that is convert the small connector of RF module, to standard pin connector. The pin order of RF modules in schematic diagram is based on pin order of pin adaptor, and not on pin order of the module's connector.
My circuit is constituted by 2x TRW-24G modules, 1x AT90S2313 microcontroller and 1x MAX202 TTL to RS232 voltage level converter. The RF modules work with +3.3V not with +5V. I connect this modules to STK500 development board and I set the VTG voltage to 3.3V from programmer's software in AVRstudio. For serial communication I used the internal MAX202 of STK500 board, that is working at +5V power supply. There is no problem with that, but the AT90S2313 MUST be work at 3.3V or else you will burn the RF modules if you send +5V instead +3.3V (max. 3.6V).
When you power-on this circuit, the AVR it will configure the IC1 as receiver and IC3 as transmitter. Then, the AVR it will check the DR1 pin of IC1 for incomming data. If DR1 pin of IC1 is LOW (logic '0') the AVR it will send serial from IC3 the 5 byte address of the module that is want to send the data (AA,BB,CC,DD,EE hex address) and the Payload bytes wich is the data that it want to send (31,32,33,34 hex, are the same as 1,2,3,4 ASCII). When AVR push the CE1 pin of IC3 to LOW ('0') the IC3 transmitt the data with baud rate of 250kbps (i set the communication to 250Kbps not to 1Mbps). After some small delay, the AVR is going to read again the DR1 pin of IC1 for incomming data. In this step the DR1 pin of IC1 is going to logic '1' because receiver's buffer now have the 4 bytes (payload bytes) that we have transmit before with IC3. The LED1 it will flash for a moment to show that the receiver's buffer have incomming data. Then, the AVR it will read this 4 bytes and send them serial via PD1 and MAX202 to PC with baud rate 9600bps/8/n/1. When AVR read all data from IC1, the LED1 it will turn-off.
You can connect the CN1 to COM1 serial port of your PC, run the Hyperterminal (start->programs->accesories->communications->hyperterminal) and set it at COM1 with 9600bps/8/N/1. When you power-on this circuit you will see some small flash in the LED1 and after a small delay you can see the ASCII characters <1234> in Hyperterminal's screen.
The TRW-24G modules are transmitters and receivers both. The function is dependent by the configuration of each module. When you power-on the module, you have to send 2 or 16 serial bytes to configure the modules. The method to configure this RF modules is described in this manual.
Another great tool for Windows, to make the configuration file of 16 bytes, is nRF Configuration Word Generator and is created by Michael Mittermayr.
Communicate 2 TRW-24G RF modules (2.4GHz) with AVR microcontroller. This is more an example assembly code and not an intergraded electronic circuit.
Designed by: Serasidis Vasilis
Link: http://www.serasidis.gr/circuits/TRW-24G_t...ransceivers.htm
Introduction
My first attempt with RF modules was with TLP and RLP418 modules. Those modules working at 418 MHz with slow data-rate (typical 4.8 kbits/sec) and every module is transmit or receive only. TLP418 is only transmitting data and RLP418 module is only receive data. You can not make a bi-directional communication with only one couple of this modules. The solution of this problem is the use of TRW-24G transceiver modules (transceiver = transmitter + receiver). This modules working at 2.4 GHz frequency with GFSK modulation, and the data-rate is 250Kbps and 1Mbps (1 mega bit/second!)
TRW-24G Specification
- Frequency Range: 2.4~2.524 GHz ISM band
- Modulate Mode: GFSK
- Data Rate: 1Mbps; 250Kbps
- Multi channel operation: 125 channels, Channel switching time<200uS, Support frequency hopping
- Emulated full duplex RF link due to the 1Mbits/s on the air data rate
- Simultaneous dual receiver
- Data slicer / clock recovery of data
- Including decoder, encoder and data buffer and CRC computation
- ShockBurst mode for ultra-low power operation and relaxed MCU performance
- Sensitivity: -90dBm
- Built in antenna
- Power supply range: 1.9 to 3.6 V
- Low supply current (TX), typical 10.5mA peak@ -5dBm output power
- Low supply current (RX), typical18mA peak in receive mode
- Supply current in Power Down Mode: 1 uA
- Operating Temperature: -40~+85 Centigrade
- Size: 20.5*36.5*2.4mm
- 100% RF tested
- Competitive price
Applications
- Wireless mouse, keyboard, joystick
- Wireless data communication
- Alarm and security systems
- Home automation
- Wireless Earphone
- Telemetry
- Surveillance
- Automotive
First of all I would like to say that the TRW-24G connector pins are too small (~1mm pin to pin). For that I order the adaptor PCB that is convert the small connector of RF module, to standard pin connector. The pin order of RF modules in schematic diagram is based on pin order of pin adaptor, and not on pin order of the module's connector.
My circuit is constituted by 2x TRW-24G modules, 1x AT90S2313 microcontroller and 1x MAX202 TTL to RS232 voltage level converter. The RF modules work with +3.3V not with +5V. I connect this modules to STK500 development board and I set the VTG voltage to 3.3V from programmer's software in AVRstudio. For serial communication I used the internal MAX202 of STK500 board, that is working at +5V power supply. There is no problem with that, but the AT90S2313 MUST be work at 3.3V or else you will burn the RF modules if you send +5V instead +3.3V (max. 3.6V).
When you power-on this circuit, the AVR it will configure the IC1 as receiver and IC3 as transmitter. Then, the AVR it will check the DR1 pin of IC1 for incomming data. If DR1 pin of IC1 is LOW (logic '0') the AVR it will send serial from IC3 the 5 byte address of the module that is want to send the data (AA,BB,CC,DD,EE hex address) and the Payload bytes wich is the data that it want to send (31,32,33,34 hex, are the same as 1,2,3,4 ASCII). When AVR push the CE1 pin of IC3 to LOW ('0') the IC3 transmitt the data with baud rate of 250kbps (i set the communication to 250Kbps not to 1Mbps). After some small delay, the AVR is going to read again the DR1 pin of IC1 for incomming data. In this step the DR1 pin of IC1 is going to logic '1' because receiver's buffer now have the 4 bytes (payload bytes) that we have transmit before with IC3. The LED1 it will flash for a moment to show that the receiver's buffer have incomming data. Then, the AVR it will read this 4 bytes and send them serial via PD1 and MAX202 to PC with baud rate 9600bps/8/n/1. When AVR read all data from IC1, the LED1 it will turn-off.
You can connect the CN1 to COM1 serial port of your PC, run the Hyperterminal (start->programs->accesories->communications->hyperterminal) and set it at COM1 with 9600bps/8/N/1. When you power-on this circuit you will see some small flash in the LED1 and after a small delay you can see the ASCII characters <1234> in Hyperterminal's screen.
The TRW-24G modules are transmitters and receivers both. The function is dependent by the configuration of each module. When you power-on the module, you have to send 2 or 16 serial bytes to configure the modules. The method to configure this RF modules is described in this manual.
Another great tool for Windows, to make the configuration file of 16 bytes, is nRF Configuration Word Generator and is created by Michael Mittermayr.
| CODE |
; Test program for 2 TRW-24G RF modules connected 1 to PortB and 1 to PortD of an ; AT90s2313 at 4MHz. AVR is send 4 bytes through the 1st RF module. 2nd RF module receive ; this bytes and AVR read them and send them to PC via RS232 hardware serial port (PD1) ; ; Device: AT90S2313 at 4MHz crystal, ; and 2 x TRW-24G RF devices (2.4 GHz) ; Author: Serasidis Vasilis ; Date: 24.07.2005 ; Home page: http://www.serasidis.gr ; emails: info@serasidis.gr, avrsite@yahoo.gr ; Writed with AVRstudio 4.10 .include "2313def.inc" ;1st TRW-24G -> AVR (portB pins) .equ DATA1 =0 .equ CS1 =1 .equ CE1 =2 .equ CLK1 =3 .equ DR1 =4 ;2nd TRW-24G -> AVR (PortD pins) .equ DATA2 =2 .equ CS2 =3 .equ CE2 =4 .equ CLK2 =5 .equ DR2 =6 .equ BAUD =24 ;9600 bps at 4 MHz (hardware UART) .def temp =r16 .def temp2 =r17 .def count =r18 .def txbyte =R19 ;Data to be transmitted .def rxbyte =R20 ;Received data .def bitcnt =r21 ldi temp,RAMEND out SPL,temp ;Init Stack Pointer ldi temp,0b11101111;port B output, PB4 input out DDRB,temp ldi temp,0b00000000; out PORTB,temp ldi temp,0b00111110;port D output, PD0,PD6 inputs out DDRD,temp ldi temp,0b00000000; out PORTD,temp ldi temp, BAUD out UBRR, temp;Set baud rate generator ;=========== Set UART, as Transmiter ===================== ldi temp,0b00011000 out UCR,temp;Enable UART Tx w/o interrupts ;============================================================== cbi portD,CE2;Clear CE2 pin sbi portD,CS2;Set CS2 pin rcall loadbyte2;make device2 receiver cbi portD,CS2;Clear CS2 pin sbi portD,CE2;Set CE2 pin cbi portB,CE1;Clear CE1 pin sbi portB,CS1;Set CS1 pin rcall loadbyte1;make device1 transmitter cbi portB,CS1;Clear CS1 pin Send_bytes_to_receiver: sbic pind,DR2;Is any new data in receiver's buffer ? rjmp send_to_PC;If yes, go to "send_to_PC" address ;if not, continue. sbi portb,CE1;Set CE1 pin high ldi txbyte,$AA;Set the address of the receiver module: $AA, $BB, $CC, $DD, $EE rcall transmit_byte ldi txbyte,$BB rcall transmit_byte ldi txbyte,$CC rcall transmit_byte ldi txbyte,$DD rcall transmit_byte ldi txbyte,$EE rcall transmit_byte ldi txbyte,$31 ;Set the payload bytes $31, $32, $33, $34 rcall transmit_byte ldi txbyte,$32 rcall transmit_byte ldi txbyte,$33 rcall transmit_byte ldi txbyte,$34 rcall transmit_byte cbi portb,CE1 ;Send address and payload bytes (over the air) to receiver. rcall delay rcall delay rjmp Send_bytes_to_receiver ;============================================================================================ send_to_PC: ldi count,4 ;4 bytes length send_all_bytes: rcall read_RF_module;read received byte from RF module rcall UART_transmit;and transmit it to PC via serial port (at 9600 bps) dec count ; have you read all bytes from RF module ? brne send_all_bytes; if not, go to read next here: ; if yes, stay here for ever. rjmp here ;============================================================================================ loadbyte1: ldi count,15 ;15 bytes length from_send: ldi ZH,high(2*message1);Load High byte of Flash memory to ZH ldi ZL,low(2*message1);Load Low byte of Flash memory to ZL next_byte: lpm ; Load byte from program memory into r0 mov txbyte,r0 ;move byte from program memory (r0), to txbyte register. rcall transmit_byte adiw ZL,1 ; Increase Z register dec count ; Check if we've reached the end of the message (byte 16) brne next_byte ; If so, quit ret ;------------------------------------------ loadbyte2: ldi count,15 ;15 bytes length ldi ZH,high(2*message2);Load High byte of Flash memory to ZH ldi ZL,low(2*message2);Load Low byte of Flash memory to ZL next_byte2: lpm ; Load byte from program memory into r0 mov txbyte,r0 ;move byte from program memory (r0), to txbyte register. rcall transmit_byte2 adiw ZL,1 ; Increase Z register dec count ; Check if we've reached the end of the message (byte 16) brne next_byte2 ; If so, quit ret ;------------------------------------------- message1:;Configuration of transmitter .db 0x00, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xA3, 0x4C, 0x04, 0x00 message2:;Configuration of receiver .db 0x00, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xA3, 0x4C, 0x05, 0x00 .db "(c) 24.07.2005 by Serasidis Vasilis. http://www.serasidis.gr" ;-------------------------------------------------------------------------- ; Send 1 byte to 1st RF module ;-------------------------------------------------------------------------- transmit_byte: ldi bitcnt,8 sbi DDRD,DATA1 ;make DATA1 pin output putchar0: lsl Txbyte ;Get next bit brcc putchar1;If carry set sbi PORTB,DATA1; send a '1' rjmp putchar2;else putchar1: cbi PORTB,DATA1;send a '0' nop putchar2: sbi portb,CLK1 cbi portb,CLK1 dec bitcnt ;If not all bit sent brne putchar0;send next ret ;return ;-------------------------------------------------------------------------- ; Send 1 byte to 2nd RF module ;-------------------------------------------------------------------------- transmit_byte2: ldi bitcnt,8 sbi DDRD,DATA2 ;make DATA2 pin output putchar02: lsl Txbyte ;Get next bit brcc putchar12;If carry set sbi PORTd,DATA2; send a '1' rjmp putchar22;else putchar12: cbi PORTd,DATA2;send a '0' nop putchar22: sbi portd,CLK2 cbi portd,CLK2 dec bitcnt ;If not all bit sent brne putchar02;send next ret ;return ;-------------------------------------------------------------------------- ;------------------ Reading of the RF module ------------------- ;-------------------------------------------------------------------------- Read_RF_module: clr txbyte ldi bitcnt,8 ;8 bits length for the byte cbi DDRD,DATA2 ;make DATA2 pin input sbi PORTD,DATA2 ;Enable pullup resistor on DATA2 pin. next_bit: rol txbyte ;Rotate left the txbyte register sbi PortD,clk2 ;Set the clock pin sbic PIND,DATA2 ;Read if the data pin, is '1' sbr txbyte,0x01 ;If yes, make '1' the 1st bit of txbyte register cbi PortD,clk2 ;Clear the clock pin dec bitcnt ;Decrease by 1 the bitcnt register brne next_bit ;If bitcnt register is not 0, go to next_bit ret ;return ;-------------------------------------------------------------------------- ; Transmiting routine (The data from RF module -through the AVR- are going ; to PC computer) ;-------------------------------------------------------------------------- UART_transmit: sbis USR,UDRE ;is UART transmitter ready? rjmp UART_transmit out UDR,txbyte ;send out char ret ;-------------------------------------------------------------------------- ; Receiving routine (The data from PC computer -through the AVR- are going ; to RF module) ;-------------------------------------------------------------------------- UART_receive: sbis USR,RXC rjmp UART_receive in rxbyte,UDR out portb,rxbyte ret ;-------------------------------------------------------------------------- delay: ldi temp2,50 decrease2: ldi temp,255 decrease1: dec temp brne decrease1 dec temp2 brne decrease2 ret |