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7.4. SOFTWARE DESIGN
the master (the uplink module ) to a slave (any attached peripheral), followed
by nine data bytes from the slave to the master. It is assumed that the MSB
will be a status indication and the remaining eight bytes are data. For the
purposes of the RFID peripheral, the status byte represents the direction and
speed of the bird and the remaining eight bytes will b e used for the 64 bit
ID. This exchange makes use of I
2
C’s repeated start facility and Figure 7.4
illustrates a typical e xchange with a peripheral.
Figure 7.4: I
2
C protocol used in uplink module
Diagram based on illustration from [19].
The byte sent to the slave before retrieving the data is used to send
commands to the device (for example, power down, power up or sleep) and
is also useful if the peripheral device supplies more than one data type (for
example, the same weather monitoring peripheral can supply temperature,
wind speed and direction or atmospheric pressure). This initial master-slave
byte allows for the master to select one of the peripheral’s different responses.
7.4 Software De sign
The firmware runs on a microprocessor with limited processing power and
memory resources. It is thus important that the programming model be
fast, able to handle multiple processes and have a compact memory footprint.
Bearing this in mind, it was decided to use communicating finite state machines
(FSMs). Communication takes place via shared memory.
The development environment is provided by the manufacturer of the
chosen processor, Microchip’s MPLAB v7.4 with the C18 C-compiler. Included
with this package are interfaces to the processor’s on-board peripherals (such
as timers, communication busses, ADCs) and methods for controlling popular
attached hardware devices (such as I
2
C EEPROM devices and intelligent
LCD displays).
75
- 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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