LCD Display with PICDem 2 Plus. Thread starter mrgobis; Start date Jul 3, 2009; M. Mrgobis New Member. Jul 3, 2009 #1. Thread starter #1. Does anyone has a sample code that displays a text / string on LCD display? You need to specify the connection based on your hardware. LCD display on PICDEM 2 Plus board [Archive] - MEL.

Microchip offers a bundle of the PICDEM 2 PLUS and the MPLAB® ICD 3, called the MPLAB® ICD 3 Evaluation Kit (with PICDEM 2 Plus), product number DV164036. Sample programs are provided to demonstrate the unique features of the supported devices. Newer version development tools are available now.
Connecting the PICDEM 2 PLUS 6. Read through the PICDEM 2 PLUS User Manual starting with Section 2.2 on page 12 to learn about the default program stored on the PIC18f4520 along with the hardware configuration of the PICDEM 2 PLUS development board. Power the PICDEM 2 PLUS development board using the included 9v DC power supply.
EECE 342 - Microprocessors Lab Team 3, Project 2 Mohammed AlMahamedh, Abdullah AlShehri, Thomas Bosch, Hawley Gary, Michael Meaux.

Hi, I'm a programmer, and new to electronics. A company gave me a PICDEM 2 Plus demo board to go home for 2 weeks and sorta play with it, however, I have been unsuccessful getting all the hardware to talk to each other.
i was wondering if I could get help or a really good tutorial that went through step-by-step through installation, so I can start working with this demo board, and program something really cool.
Right now I'm using the following.
1.) CCS C Compiler
2.) MPLAB v7.60 IDE CCS C compiler is currently the compiler
3.) PICDEM 2 Plus demo board self powered
4.) MPLAB ICD 2 debugger currently being powered through the PICDEM 2 demo board
5.) lapotp connected through USB
I have a sample code that has been successfully built correctly and compiled, however I get a couple of errors trying to talk to the ICD
[sourcecode]
Connecting to MPLAB ICD 2
ICD0019: Communications: Failed to open port: (Windows::GetLastError() = 0x2, 'The system cannot find the file specified.
')
ICD0021: Unable to connect with MPLAB ICD 2
MPLAB ICD 2 Ready
Connecting to MPLAB ICD 2
ICD0019: Communications: Failed to open port: (Windows::GetLastError() = 0x2, 'The system cannot find the file specified.
')
ICD0021: Unable to connect with MPLAB ICD 2
MPLAB ICD 2 Ready
Downloading Operating System
ICD0255: Download OS failed.
...Download Operating System Failed
ICD0092: Internal: Communications: Attempt to operate on unopened comm channel
ICD0082: Failed MPLAB ICD 2 operation
ICD0082: Failed MPLAB ICD 2 operation
ICD0082: Failed MPLAB ICD 2 operation
ICD0082: Failed MPLAB ICD 2 operation
MPLAB ICD 2 Ready
[/sourcecode]
fails to connect each time.
It even said reading 0x21 expecting 0x84 wrong OS, and I said download the correct OS, but that failed as well.
Please help. I rather code and debug my code than installing hardware. i'm a programmer, and I'm not very good at installing hardware.
thanks,
C

Active1 year, 8 months ago

Here's the task:You will use the “External Interrupt” pin (pin name is “INT”) to generate an interrupt. This pin is tied to switch “S3” on the PICDEM 2 Plus eval board. Pushing this switch will generate the interrupt. We will configure this pin as in input, enable External Interrupts, enable Global Interrupts, and keep track of how many times we’ve generated this interrupt with a register we create called “Push_Count”.

Here's my code:

My problem is that every time I'm pressing the S3 switch on PICDEM 2, the interrupt is not working and the value of the PUSH_COUNT register is not increasing/counting. Any problem with my code? I'm just new to PIC. Thanks

elvinguitarelvinguitar

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Picdem 2 Plus Sample Programs

2 Answers

I'n not familiar to PICs, and I don't know how the switch is connected, but:Check that the pull-up configuration matches the switch connection (no pull-up, if the switch is between the pin and VCC). Check the edge configuration (OPTION-register) and check that you clear the INTF before first enabling the interrupt.

Also, watch out if there is no debouncing filter for the switch. The switch alone may produce long series of pulses before the line state settles. Upto 100 ms. That could make the looping inside the interrupt a problem.Not knowing your clock frequency, I don't have any idea how long the looping takes. Looks like you are looping 65536 times.

turboscrewturboscrew

At first glance, your code looks OK (disclaimer; I have never worked with this particular pic and I usually code in C).

This could simply be a refresh issue as the microchip tools (ex. PicKit, ICD, ... ) don't get real-time memory information, they load the memory of the pic when code execution pauses. Your post does not mention anything to rule out this issue. To see a change in the variable, you will have to occasionally pause execution so that the IDE has a chance to reload the PIC's memory and refresh the value.

Mathieu L.Mathieu L.

Picdem 2 Plus Sample Programs

2 Answers

Picdem 2 Plus Demo Board

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