III - Advanced Project » History » Version 26

COLIN, Tony, 12/14/2015 09:33 AM

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h1. III - Advanced Project.
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{{>toc}}
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h2. 1. Adapting project to elementary task.
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See [[Wiki#"3. Creation of a simple MPLAB X IDE project"|Tutorial page]] for project bases.
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In this part, you will have to modify particular files of the previous Test/.
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h3. 1.1 Integration of C Source files into task(s).
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* task_name.c stating _void task_name (void) { ... }_.
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Here you can either call the C main function in the task_name function or adapting your main file into one or several tasks (for simultaneity during process).
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* task_name.h stating _extern void task_name (void);_ and other intern functions.
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h3. 1.2 Definition of your task(s) to be called.
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* tasks.h defining OSTCBP of all predifined tasks (way of specifying a pointer to a particular Salvo _Task Control Block_). More information available on Salvo User Manual.
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* task_cmd.c which is a tool provided by Test/ that allows to resume/stop your task(s).
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!task_cmd.png!
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* main.c i.e. the basic implementation to call your task(s).
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!main.png!
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---
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h2. 2. Integration of a Reed-Solomon encoder/decoder.
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A highly convenient implementation of a Reed-Solomon code is available on "RS Code Website":http://rscode.sourceforge.net/ and will be integrated in the following.
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h3. 2.1 Presentation of Reed-Solomon.
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h3. 2.2 Task Example.
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---
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h2. 3. Displaying results.
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h3. 3.1 In simulation.
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p=. !CodingWin3.png!
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*Message of 87 characters*
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p=. !CodingWin2.png!
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*Code of adding errors*
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p=. !UART1.png!
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*Checking Output UART Window*
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p=. !CodingWin1.png!
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*Displayed result*
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h3. 3.2 On board.
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|_.-                    |_.Char       |_.Code ASCII  |_.Hexadecimal |_. Binary       |
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|_.Codeword             |=. 2         |=. 50         |=. 0x32       |   0b00110010   |
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|_.Erroneous Codeword   |=. 3         |=. 51         |=. 0x33       |   0b00110011   |
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!LEDs_resized.png! !LEDs_error_resized.png! !LEDs_resized.png!
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__________________ *a. Codeword : 0bXX110010* ________________________ *b. Erroneous codeword : 0bXX110011* ____________________ *c. Corrected codeword : 0bXX110010* ______________
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---
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h2. 4. Measurement of encoding/decoding time.
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p=. !Clock1.png!
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*1000 ticks per milliseconds*
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p=. !Clock2.png!
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*Time measurement of data encoding*
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p=. !Clock3.png!
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*Printing clock data*
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p=. !Time_RS_resized.PNG!
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*Chart of Reed Solomon time measurement*