djcheezy

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Posts posted by djcheezy

    uC32 Output Compare Timers

    in Digilent Microcontroller Boards

    Posted

    Hi guys,

    I'll looking to use 3 of the 5 compare pwm outputs available on the uC32.  I would like to use them to generate 3 square waves all around 830Hz.  They'll all be fixed frequency from the start of the program.  I've seen the sample code in the datasheet, but I think there must be easier higher level functions I can call.  I would like to send the output on the OCx pins.

    Can anyone point me in the direction of some resources for this?  I can't seem to get anything out of the OC pins.

    Thanks,

    djcheezy

    Uno32 w/ pmod shield and pmodDA4

    in Add-on Boards

    Posted

    JColvin,

    I had planned on using multiple outputs at differing voltages simultaneously.  I was unaware of this limitation on the ADI chip.  I guess I should have read the datasheet better :blink:

    I don't think that this should pose to much of a problem however.  I can just run the clock faster, and maybe stick a cap on the outputs to keep the voltage up.

    Is there any way you can post a picture of the bottom of the Pmod shield?  I can find a photo online, and I'm curious as to what the bottom of it looks like.

    You've been an awesome help, I'll definitely look into the daisy-chaining your block diagram explains it pretty well.

    Thanks so much,

    djcheezy

    Getting The Pmod Shield To Work Correctly

    in Add-on Boards

    Posted

    This seems to be working for me when I paste it into boards.h.  I am able to compile example code using the uC32 board with Pmod Shield:

    ############################################################
    uC32_pmod.name=chipKIT uC32 with Pmod Shield
    uC32_pmod.group=chipKIT

    # new items
    uC32_pmod.platform=pic32
    uC32_pmod.board=_BOARD_UNO_
    uC32_pmod.compiler.define=-Danything_you_want::-Danything=1
    uC32_pmod.ccflags=ffff
    uC32_pmod.ldscript=chipKIT-application-32MX340F512.ld
    # end of new items

    # Use a high -Gnum for devices that have less than 64K of data memory
    # For -G1024, objects 1024 bytes or smaller will be accessed by
    # gp-relative addressing
    uC32_pmod.compiler.c.flags=-O2::-c::-mno-smart-io::-w::-ffunction-sections::-fdata-sections::-G1024::-g::-mdebugger::-Wcast-align
    uC32_pmod.compiler.cpp.flags=-O2::-c::-mno-smart-io::-w::-fno-exceptions::-ffunction-sections::-fdata-sections::-G1024::-g::-mdebugger::-Wcast-align

    uC32_pmod.upload.protocol=stk500v2
    uC32_pmod.upload.maximum_size=126976
    uC32_pmod.upload.speed=115200

    uC32_pmod.bootloader.low_fuses=0xff
    uC32_pmod.bootloader.high_fuses=0xdd
    uC32_pmod.bootloader.extended_fuses=0x00
    uC32_pmod.bootloader.path=not-supported
    uC32_pmod.bootloader.file=not-supported
    uC32_pmod.bootloader.unlock_bits=0x3F
    uC32_pmod.bootloader.lock_bits=0x0F

    uC32_pmod.build.mcu=32MX340F512H
    uC32_pmod.build.f_cpu=80000000L
    uC32_pmod.build.core=pic32
    uC32_pmod.build.variant=uC32_Pmod_Shield
    #uC32_pmod.upload.using=


    ############################################################

    Uno32 w/ pmod shield and pmodDA4

    in Add-on Boards

    Posted

    Hi JColvin,

    What I'm worried about is using SPI to communicate with the Pmods.  I need 18 analog output signals, so I was planning on using 3 PmodDA4s with the Pmod Shield on the Uno32.  This shield appeared to work well because I also need 19 digital I/O.  The linked post casts doubt on how well using multiple Pmods with SPI will work.

    http://chipkit.net/forum/viewtopic.php?f=16&t=1529

    I found your previous post setting up the Pmod Shield, which I found very informative: https://forum.digilentinc.com/topic/81-getting-the-pmod-shield-to-work-correctly/#comment-197

    Do you believe that I'll be able to use SPI or DSPI to communicate to all three PmodDA4s?

    Thanks for all your help,

    djcheezy

    Uno32 w/ pmod shield and pmodDA4

    in Add-on Boards

    Posted

    Hey guys,

    I'm currently trying to spec a project using the Uno32 with the pmod shield.  The pmod I would like to use is the DA4 digital to analog converter.

    I've noticed that in Diligent's reference section there is an example code section for the pmodDA1 which gives a zip file including examples, a library, and a library manual for using the DA1.  However such resources don't exist for the DA4.  Does anyone know if that library be necessary for using the pmodDA4, or where I can find some examples of using it?  I'm not new to microcontrollers, but I am new to pmod...

    Any help would be appreciated!

    Thanks!