Wavecom GR64 UART Sleep Protocols Spécifications Page 95
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- Table des matières
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Noté. / 5. Basé sur avis des utilisateurs
7.4. SOFTWARE DESIGN
of approximately 50 possible states.
Initialisation
Ordinarily, the GSM state is “powered down”. Any software component may
invoke the GSM unit by changing this state to “powering up”. At this point,
the GSM FSM pulls the hardware power line high and continually sends the
module a software reset command (“ATZ”) while waiting for a response. If
no response is received w ithin four seconds, then the power down sequence
is begun. If, however, the unit is correctly functioning, an “OK” response is
received and device initialisation follows. Extended error reporting is enabled
to aid troubleshooting and the status is displayed on the LCD screen on line
two. The reporting mode is also changed from the default “verbose” to
“numeric” w hich results in less processing overhead.
If the module accepts the SIM PIN number (as restored from the EEPROM
backup), responds to all initialisation commands with an “OK” and connects
successfully to either the home network or another network with which the
operator has an agreement, then the state changes to “GSM idling”. At this
point the application which started the GSM module may request an SMS
check, initiate GPRS attach procedure or shut down.
GPRS Attach
The GM862 features an on-board TCP/IP stack. If the software requests
a GPRS attach, then the module attempts to attach to the GPRS APN as
specified by the user in the EEPROM setting and obtain an IP address. If
this was successful, the obtained IP address is reported to the user via the
LCD display and the GSM state changes to “GSM idling, GPRS attached”.
Once in this state, the host application may initiate an email send. If the
attach was not successful, the FSM will retry the connection. The requesting
application may set the number of retries by pre-setting the global variable
“retry
counter” with the maximum number of permitted retries. With every
retry, this counter is decremented until it reaches zero at which point the
GSM FSM cancels the request. A time-out is also implemented to ensure
that the module does not wait indefinitely for a successful attach.
82
- Low Cost 1
- Penguin RFID Reader 1
- Abstract 2
- Acknowledgements 3
- Declaration 4
- Contents 5
- List of Figures 9
- List of Tables 11
- Glossary 12
- Chapter 1 15
- Introduction 15
- 1.3 Project Timeframe 16
- 1.5 Project Challenges 18
- 1.6 Report Structure 20
- Chapter 2 21
- Analysis of Existing Solution 21
- 2.2 Power Supply 23
- 2.4 Data Delivery 25
- Chapter 3 26
- Device Specification 26
- Chapter 4 29
- Overview of Proposed Solution 29
- 4.3 Uplink Module 31
- 4.4 Interconnections 32
- 4.5 Power Supply 32
- Chapter 5 33
- RFID Reader Design 33
- 5.1.3 Operating Frequency 37
- 5.3.1 64 Data Bits 42
- 5.3.2 CRC Verification 42
- 5.4 Hardware 43
- 5.4. HARDWARE 49
- 5.4.5 Processor 53
- 5.4.6 Interface 56
- 5.4.7 PCB Layout 56
- 5.5 Software 57
- 5.5.2 Capture Stage 58
- 5.5. SOFTWARE 60
- 5.5.3 Decode Stage 61
- 5.6 Design Evaluation 63
- 5.6.4 Power Consumption 67
- Avnett Kopp, September 2006 69
- ZAR9.50 to 1 Euro 69
- Chapter 6 70
- RFID Co-ordinator 70
- 6.2 Software 71
- 6.2.1 Timers 72
- 6.2.2 RFID Reader Request FSM 72
- 6.3 Evaluation 75
- Chapter 7 76
- Uplink Design 76
- 7.3 Hardware Design 80
- 7.3.2 Processor 83
- 7.3.3 User Interface 84
- 7.3.4 Power Supply 85
- 7.4 Software De sign 88
- Except for the I 89
- Details in Section 7.4.5 89
- 7.4.2 Real Time Clock 90
- 7.4.3 User interface 90
- 7.4.4 Peripheral Poll FSM 91
- 7.4.6 Timer FSM 93
- 7.4.7 GSM FSM 94
- 7.4.8 Report Generation FSM 97
- 7.5 Reliability 98
- 7.5.1 Software 99
- 7.5.2 Hardware 100
- Chapter 8 102
- Power Supply 102
- 8.3 Regulator Selection 103
- 8.4.1 Hardware 107
- 40% of 7.5Ah 110
- 8.4.2 Software 111
- 8.5 Measurements 113
- 8.6 Conclusion 114
- Chapter 9 115
- Enclosure Selection and 115
- Mounting Methods 115
- 9.2 Recommendations 116
- Chapter 10 118
- South African Regulations 118
- 10.1 GSM Module 119
- 10.2 RFID Readers 119
- Chapter 11 120
- Conclusion and System 120
- Evaluation 120
- Appendix A 122
- Appendix: RFID Receiver 122
- DUAL-CHANNEL RECEIVER 123
- Appendix B 127
- Appendix: RFID Co-ordinator 127
- B.2. PCB LAYOUT 128
- Appendix C 130
- Appendix: Uplink Module 130
- C.2 List of Uplink Commands 131
- C.3 PCB Design 131
- C.3. PCB DESIGN 133
- Appendix D 137
- Appendix: Power Supply 137
- Appendix E 139
- Appendix: Software 139
- References 140
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