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learn:courses:unit-5:start [2017/04/13 22:14] – [7.1. IrDA Physical Layer] Marthalearn:courses:unit-5:start [2022/10/04 11:38] (current) – external edit 127.0.0.1
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 ====== Unit 5: IrDA Communications Protocols ====== ====== Unit 5: IrDA Communications Protocols ======
 +[[{}/learn/courses/unit-4-1/start|Back to Unit 4 Part 1]]
 +[[{}/learn/courses/unit-4-2/start|Back to Unit 4 Part 2]]
 +
 === Unit 5 Lab === === Unit 5 Lab ===
-  * [[https://reference.digilentinc.com/learn/courses/unit-5-lab5a/start|Lab 5a]]+  * [[/learn/courses/unit-5-lab5a/start|Lab 5a]]
  
  
 === Download This Document === === Download This Document ===
-  * {{ :learn:courses:unit-5:unit_5.pdf |Unit 5 PDF}}+{{ :learn:courses:unit-5:unit_5.pdf |Unit 5 PDF}}
  
 ===== 1. Introduction ===== ===== 1. Introduction =====
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 ===== 2. Objectives: ===== ===== 2. Objectives: =====
-  * Identify the IrDA protocol by capturing the bit stream on the IR_RX pin using the Analog Discovery 2. +  - Identify the IrDA protocol by capturing the bit stream on the IR_RX pin using the Analog Discovery 2. 
-  * Develop a C function that executes an algorithm to decode the IrDA bit stream. +  - Develop a C function that executes an algorithm to decode the IrDA bit stream. 
-  * Display the received codes on the LCD and send to the UART communications port.+  - Display the received codes on the LCD and send to the UART communications port.
  
  
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 ===== 3. Basic Knowledge: ===== ===== 3. Basic Knowledge: =====
-  * How to configure I/O pins on a Microchip® PIC32 PPS microprocessor.  +  - How to configure I/O pins on a Microchip® PIC32 PPS microprocessor.  
-  * How to configure the Analog Discovery 2 to display logic traces. +  - How to configure the Analog Discovery 2 to display logic traces. 
-  * How to implement the design process for embedded processor based systems.+  - How to implement the design process for embedded processor based systems.
    
  
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 ===== 4. Unit Equipment List ===== ===== 4. Unit Equipment List =====
 ==== 4.1. Hardware ==== ==== 4.1. Hardware ====
-  * [[http://store.digilentinc.com/basys-mx3-pic32mx-trainer-board-recommended-for-embedded-systems-courses/|Basys MX3 trainer board]] +  - [[https://digilent.com/shop/basys-mx3-pic32mx-trainer-board-for-embedded-systems-courses/|Basys MX3 trainer board]] 
-  * [[http://store.digilentinc.com/usb-a-to-micro-b-cable/|Standard USB A to micro-B cable]] +  - [[https://digilent.com/shop/usb-a-to-micro-b-cable/|Standard USB A to micro-B cable]] 
-  * Workstation computer running Windows 10 or higher, MAC OS, or Linux+  - Ordered List ItemWorkstation computer running Windows 10 or higher, MAC OS, or Linux
  
 In addition, we suggest the following instruments: In addition, we suggest the following instruments:
-  * [[http://store.digilentinc.com/analog-discovery-2-100msps-usb-oscilloscope-logic-analyzer-and-variable-power-supply/|Digilent Analog Discovery 2]]+  - [[https://digilent.com/shop/analog-discovery-2-100ms-s-usb-oscilloscope-logic-analyzer-and-variable-power-supply/|Digilent Analog Discovery 2]]
  
 ==== 4.2. Software ==== ==== 4.2. Software ====
 The following programs must be installed on your development work station: The following programs must be installed on your development work station:
-  * [[http://www.microchip.com/mplab/mplab-x-ide|Microchip MPLAB X® v3.35 or higher]] +  - [[http://www.microchip.com/mplab/mplab-x-ide|Microchip MPLAB X® v3.35 or higher]] 
-  * [[http://www.microchip.com/SWLibraryWeb/product.aspx?product=PIC32%20Peripheral%20Library|PLIB Peripheral Library]] +  - [[http://www.microchip.com/SWLibraryWeb/product.aspx?product=PIC32%20Peripheral%20Library|PLIB Peripheral Library]] 
-  * [[http://www.microchip.com/xcdemo/xcpluspromo.aspx|XC32 Cross Compiler] +  - [[http://www.microchip.com/xcdemo/xcpluspromo.aspx|XC32 Cross Compiler] 
-  * [[http://store.digilentinc.com/waveforms-2015-download-only/|WaveForms 2015]] +  - [[https://digilent.com/shop/software/digilent-waveforms/|WaveForms]] 
-  * [[http://www.putty.org/|PuTTY Terminal Emulator]]+  - [[http://www.putty.org/|PuTTY Terminal Emulator]]
  
 ---- ----
  
 ===== 5. Project Takeaways ===== ===== 5. Project Takeaways =====
-  * Understanding of the basics of IrDA protocols. +  - Understanding of the basics of IrDA protocols. 
-  * Using instrumentation to characterize data streams. +  - Using instrumentation to characterize data streams. 
-  * Use processor external interrupts to decode signal timing patterns. +  - Use processor external interrupts to decode signal timing patterns. 
-  * Approaches to using state machines to process data.+  - Approaches to using state machines to process data.
  
  
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-{{ :learn:courses:unit-5:unit_5_fig_7_3.jpg?nolink |Figure 7.3. IrDA 38 kHz carrier signal.}}+{{ :learn:courses:unit-5:unit_5_fig_7_3.png?nolink |Figure 7.3. IrDA 38 kHz carrier signal.}}
 //Figure 7.3. IrDA 38 kHz carrier signal.// //Figure 7.3. IrDA 38 kHz carrier signal.//
- 
-{{ :learn:courses:unit-5:fig-7-3.png?nolink&700 |}} 
- 
  
 Figure 7.4 shows a complete IrDA message using the NEC protocol. The signal is low whenever an infrared light is detected. The NEC protocol message contains 32 bits organized in eight bit bytes sent with LSB first. After a 9 ms leader and a 4.5 ms gap, a 560 μs bit marker signals the start of the LSB of the first data byte, as shown in Fig. 7.5.    Figure 7.4 shows a complete IrDA message using the NEC protocol. The signal is low whenever an infrared light is detected. The NEC protocol message contains 32 bits organized in eight bit bytes sent with LSB first. After a 9 ms leader and a 4.5 ms gap, a 560 μs bit marker signals the start of the LSB of the first data byte, as shown in Fig. 7.5.   
  
  
-{{ :learn:courses:unit-5:unit_5_fig_7_4.jpg?nolink |Figure 7.4. Screen capture of a NEC IrDA control message.}}+{{ :learn:courses:unit-5:unit_5_fig_7_4.png?nolink |Figure 7.4. Screen capture of a NEC IrDA control message.}}
 //Figure 7.4. Screen capture of a NEC IrDA control message.// //Figure 7.4. Screen capture of a NEC IrDA control message.//
- 
-{{ :learn:courses:unit-5:fig-7-4.png?nolink&700 |}} 
- 
  
 Figures 7.5 and 7.6 show expanded views of portions of the NEC IrDA protocol, showing the sync followed by three of the 24 data bits. Note that the differentiation between a ONE bit and a ZERO bit is the length of the gap following each 560 μs period of 38 kHz modulated infrared pulses. The last byte contains 9 pulse bursts to allow the last bit to be framed correctly. Figures 7.5 and 7.6 show expanded views of portions of the NEC IrDA protocol, showing the sync followed by three of the 24 data bits. Note that the differentiation between a ONE bit and a ZERO bit is the length of the gap following each 560 μs period of 38 kHz modulated infrared pulses. The last byte contains 9 pulse bursts to allow the last bit to be framed correctly.
  
-{{ :learn:courses:unit-5:unit_5_fig_7_5.jpg?nolink |Figure 7.5. Details of the message leader and first three data bits.}}+{{ :learn:courses:unit-5:unit_5_fig_7_5.png?nolink |Figure 7.5. Details of the message leader and first three data bits.}}
 //Figure 7.5. Details of the message leader and first three data bits.// //Figure 7.5. Details of the message leader and first three data bits.//
  
-{{ :learn:courses:unit-5:fig-7-5.png?nolink&700 |}} 
  
-{{ :learn:courses:unit-5:unit_5_fig_7_6.jpg?nolink |Figure 7.6. 38 kHz pulse burst timing representing two ZERO bits and a ONE bit.}}+{{ :learn:courses:unit-5:unit_5_fig_7_6.png?nolink |Figure 7.6. 38 kHz pulse burst timing representing two ZERO bits and a ONE bit.}}
 //Figure 7.6. 38 kHz pulse burst timing representing two ZERO bits and a ONE bit.// //Figure 7.6. 38 kHz pulse burst timing representing two ZERO bits and a ONE bit.//
- 
-{{ :learn:courses:unit-5:fig-7-6.png?nolink&700 |}} 
  
  
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 +[[{}/learn/courses/unit-4-1/start|Back to Unit 4 Part 1]]
 +[[{}/learn/courses/unit-4-2/start|Back to Unit 4 Part 2]]
 +[[{}/learn/courses/unit-5-lab5a/start|Go to Lab 5a]]
 +[[{}/learn/courses/unit-6/start|Go to Unit 6]]
  
 {{tag>reference learn microprocessor courses basys-mx3}} {{tag>reference learn microprocessor courses basys-mx3}}