1. Wireless Communication
Studienarbeit
Vortrag
Wireless Communication
Von Spisa
Yang Liu(215622)

2. Einleitung Digital Signal Controller(dspic30F3013)
I/O Ports
UART
SPI
Radio Frequenz Funkmodule
nRF905 Transceiver
Steuerungsregister
Transmit and Receive
Komplete Module
Interface
Anwendungsbeispiel

3. dspic30F3013 I/O Ports TRISx: Data Direction Register
1:Input, 0:Output
PORTx: I/O Port Register
Read: Value of the I/O Pin
Write: To Port Data Latch
LATx: I/O Latch Register
Read: Value in Port Data Latch
ADPCFGx: ADC Port Configuration Register (Port B)
1: Digital I/O, 0: Analog I/O

4. Universal Asynchronous Receiver Transmitter(UART)
Full-Duplex 8- or 9 Bit Data Transmission
Even, Odd or No Parity
One or Two Stop Bits
Fully Integrated Baud Rate Generator 16 Bit Prescaler
Baud Rate 29bps to 1.875Mbps
4 Deep FIFO Transmit Data Buffer
4 Deep FIFO Receive Data Buffer
Error Detection
9 Bit Mode with Address Detection
Transmit Receive Interrupt

5. UART Register Control Register: UxMode
Enable, Alterative IO Pins, Parity Data Selection…
Status and Control Register: UxSTA
Transmit Enable, Address Detect Mode, Error Detection, Buffer Overflow, Transmit Buffer Full…
Receive Register: UxRXREG
Example: unsigned char c = U1RXREG;
Transmit Register: UxTXREG
Example: U1TXREG = ‘c’;
Baud Rate Generator: UxBRG

6. UART Register Example: Quarze: 20MHz BaudRate: 57.6Kbps UxREG = 4.42=4
Real BaudRate: 62.5Kbps
Error: 8.5%>3%
Quarze: MHz
UxREG = 5
Error: 0%

7. Serial Peripheral Interface(SPI)
Synchronous Serial Interface communicate with other Peripheral or Microcontroller
Serial EEPROMs, Shift Register, Display Drivers, ADCs, nRF905
SPI Interface consist of 4 Pins
SDIx: Serial Data Input
SDOx: Serial Data Output
SCKx: Shift Clock Input or Output
SSx: Active low Slave Select or Frame Synchronization I/O Pulse

8. SPI Register SPI Status and Control Register: SPIxSTAT
SPI Enable, SPI Transmit Buffer Full Status, SPI Receive Buffer Full Status
SPI Control Register: SPIxCON
Framed SPI Support, 8-Bit or 16-Bit Select, Master or Slave Select
Secondary and Primary Prescale Bits Bit Rate from Fcy to Fcy/512

9. SPI Master Mode Operation

10. Radio Frequenz Funkmodule
Single Chip Transceiver nRF905
433MHz, 868MHz, 915MHz ISM Band
GFSK Transceiver
Betriebspannung 1.9v-3.6v
Bis 50Kbps
Multikanäle
Senderleistung –10dBm--10dBm
Carrier Detection
Adress Match von Packet
8-Bit, 16-Bit CRC Codierung
Manchester Codierung
5x5mm 32Pin QFN Package

11. nRF905 Blockschaltbild

12. nRF905 Register

13. nRF905 Instruction

14. nRF905 Configuration Register

15. nRF905 Configuration Register
CH_NO, 9 Bits: Frequenz Einstellen Freq = (422.4+CH_NO/10)*(1+HFREQ_PLL)MHz Beispiel: Freq = 433MHz CH_NO=0x04c=0b
HFREQ_PLL, 1 Bit: Frequenz Einstellen 0: 433MHz Band, 1: 868MHz oder 915Mhz Band
PA_PWR, 2 Bits: Sendleistung Einstellen -10dBm, -2dBm, 6dBm, 10dBm
RX_AWF, TX_AWF, 3 Bits: Adressenbereit 001: 1 Byte …… 100: 4 Byte

16. nRF905 Configuration Register
RX_PW, TX_PW, 6 Bits: Payload Bereit : 1 Byte……100000: 32 Byte
RX_ADDRESS, 4 Byte: Receiver Adresse
XOF, 3 Bits: Oszillator Frequenz 4MHz, 8MHz, 12MHz, 20MHz 011: 16MHz
CRC_EN 1 Bit: CRC Codierung Enable 0: Disable, 1: Enable
CRC_MODE 1 Bit: CRC Codierung Mode 0: 8 Bit Mode, 1: 16 Bit Mode

17. nRF905 Register and Control
TX_ADDRESS, 4 Byte: Send Address
TX_PAYLOAD, 32 Byte: Send Data
RX_PAYLOAD, 32 Byte: Receive Data
STATUS_REGISTER, 1 Byte:
AM, DR

18. nRF905 Receive Standby Mode PWR_UP = HI TX_EN = LO TRX_CE = HI
Carrier Detect
Set CD High
Correct
Address?
yes
Correct
CRC? no no
yes
Set AM LO
Read Data in
RX_PAYLOAD
Via SPI
Set DR and AM LO
Set DR HI

19. nRF905 Transmit Standby Mode PWR_UP = HI TX_EN = HI TRX_CE = LO
SPI Programming
Load TX_ADDRESS
and TX_PAYLOAD
TRX_EN = HI?
Transmitter is
Powered up
yes no
yes
TRX_EN = HI?
Generate Preamble and
CRC, Send Package
Set DR Hi when Finish
Maximal 1ms no
Preamble
10 Bits
Address
To 4 Bytes
Data
To 32 Bytes
CRC
0, 1 or 2 Byte

20. Wireless Communication Interface
unsigned char NRFConfig[10]; // Configuration Bytes
unsigned char RX_ADDRESS[4]; // Speicherplatz RX Address
unsigned char TX_ADDRESS[4]; // Speicherplatz TX Address
unsigned char SpiRxBuf[32]; // Speicherplatz Receive Data
unsigned char SpiTxBuf[32]; // Speicherplatz Send Data
void SetNRFRegister(unsigned char CBit, unsigned char Register[],
unsigned char Counter); // nRF905 Konfigurieren
void SetTxMode(void); // Set TX Mode
void SetRxMode(void); // Set RX Mode
void TXPackage(void); // Send Data Package
void RXPackage(void); // Receive Data Package

21. Komplete Schaltung 433MHz

22. Funkmodule PCB 433MHz

23. Anwendungsbeispiel
Aufgabe: Ein String(bis 512 Byte) von einem PC nach ander PC Schicken.
PC1
Max232
dspic
Funk
Module
PC2
Max232
dspic
Funk
Module

24. Schaltplan

25. Protokoll Kommunikation zwischen PC und dspic durch UART
byte0
byte8
byte9
byte521
CMD
TA1
TA2
TA3
TA4 DT
MP1
MP2 LL
Data ……
Data
CMD: Command Byte, 0x00 für String Schicken
TA1-TA4: TX Address
DT: Datatyp (Char, Int, Float, Double...)
MP1,MP2: Maxmale Package Number int MaxPackNr = (MP1<<8)+MP2;
LL: Last Package Length int Datalength = (MaxPackNr-1)*29 + LL

26. Protokoll Wireless Kommunikation Protokoll Sender: First Package
byte0
byte8
ROC
TA1
TA2
TA3
TA4 DT
MP1
MP2 LL ……
ROC: 0x01, Request of Connection
TA1…TA4: TX Address
DT: Datatyp(Char, Int, Float, Double)
MP1,MP2: Maxmale Package Number int MaxPackNr = (MP1<<8)+MP2;
LL: Last Package Length int Datalength = (MaxPackNr-1)*29 + LL

27. Protokoll Sender: Empfanger:
byte0
byte3
byte31
byte0
DAT
PN1
PN2
Data ……
Data
CMD ……
CMD: Command Byte 0x03: Accept of Connection 0x04: Accept of Data 0x05: Error Package Number
DAT: 0x02, Data
PN1,PN2: Package Number int PackNr = (PN1<<8)+PN2;
Data: Byte3…Byte31

28. Protokoll A B A B A B Pack.1 Pack.1 Header ROC DAT1 DAT1 Timeout
AOC
Pack.1
Pack.1
Pack. 1
DAT1
DAT1
DAT1
Pack.1
Pack.1
AOD
AOD
EPN
Pack. 2
DAT2
Pack.2

30. Literatur [1] dsPIC30F Family Reference Manual www.microchip.com
[2] dsPIC30F3013 Data Sheet
[3] MPLAB C30C COMPILER USER'S GUIDE
[4] NORDIC SEMICONDUCTOR, Single Chip 433/868/915MHz Transceiver nRF905
[5] William Stallings, Data & Computer Communications Sixth Edition, Publishing House of Electronics Industry Beijing, 2001
[6] Karl-Dirk Kammeyer, Nachrichtenübertragung 3. Auflage, Teubner Verlag, 2004
[7] Gordon L. Stueber, Principles of Mobile Communication Second Edition, Kluwer Academic Publishers, 2001