The programs compiled with this toolchain require a bootloader to be presenton the microcontroller. If you are using a board, such as the Digilent ChipkitUno32, this bootloader should already be installed on your stock unit.

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  • Next, we need to set up the Pickit 3 connections, so we can fling binary between the chip and the Pickit 3. A simple google search brings up the attached diagram - basically we want the MCLR pins on both components to join forces, and each of the pins PGD and PGC also be matched respectively.
  • Re-programming And/Or Modifying The DFU Bootloader. Microchip PICkit 3 v3 ” or similar (on Windows). Note that the PICkit 3 software has to be installed for this file to be present (as per the requirements above).The hex file should be about 962KB in size. Select the PICkit3 hex file 'PK3IMG0200005.hex' from 'C:/Program Files (x86.
  • Solution to PICKit 3 - ' Connection Failed ' problem Many of the PICKit 3 users has faced the problem of getting 'connection failed' message, while trying to get it to work with Microchip's new IDE & Programmer utility, MPLABx & MPLAB IPE. There are various possible reasons for getting this error, some of the possible reasons are below.
  • I am trying to flash my Flyport's bootloader with a PICKIT3. When the PICKIT is connected all the LED on the Flyport remain OFF. With MPLAB I am able to connect to my PICKIT but not the Flyport (PK3Err0045: You must connect to a target device to use PICkit 3.) Please see attached how I connected the Flyport and the PICKIT.
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Microchip's PICkit™ 3 In-Circuit Debugger/Programmer. Microchip's PICkit™ 3 In-Circuit Debugger/Programmer uses in-circuit debugging logic incorporated into each chip with Flash memory to provide a low-cost hardware debugger and programmer.

Boot Loader Download

Download the bootloader

Download and unzip the boot loader from Digilent.

For the Uno32, use thefollowing URL to download the bootloader (right side):https://reference.digilentinc.com/reference/microprocessor/uno32/start

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For the uC32, use thefollowing URL to download the bootloader (right side):https://reference.digilentinc.com/reference/microprocessor/uc32/start

Installing using a Pickit 2

Install the bootloader using pk2cmd. For the Uno32, issue the followingcommand:pk2cmd -PPIC32MX320F128H -M -Farduino-bootloader.X.Uno32_8-19-11.hex

Installing using a Pickit 3

To install the bootloader using a Pickit 3, you need to have eitherMplab or Mplab X installed on your computer. Start the Mplab IPE(Integrated Programming Environment). Select the target pic32 device,for the Uno32, this is PIC32MX320F128H. Browse for the hex-file withthe bootloader and click the 'Program' button.

Installing using a ChipKIT PGM

As above, you need to install Mplab IPE.Start the Mplab IPE(Integrated Programming Environment).Select the target pic32 device.For Uno32, select PIC32MX320F128H and for the uC32, PIC32MX340F512H.Browse for the hex-file withthe bootloader and click the 'Program' button.A useful guide is the following: https://chipkit.net/wp-content/uploads/2016/02/Restore-your-chipKIT-Bootloader-Guide.pdf

Dont mess with volts, I tell you. You will never win. And in this case, we need to get from the 9, the battery, all the way down to 3.3 or so. Just look at the data sheet (page 1) which says our 24F16 chip can't tolerate more than 3.8 volts.

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So lets bring in a 1117 3.3 voltage regulator.

IMPORTANT NOTE; do not mix up the pin labels in the schematic with that of the actual physical pins! things will get too hot too soon.. this is all in the data sheet for the LM117.

Pin 1 goes to ground

Pin 2 supplies the whole board with 3.3 volts.

Pin 3 is the raw 9 volts coming from the battery.

This is great but we need to smooth it out, since any spikes of power could create havoc. We do this by using capacitors to keep the Current Continuously Consistent. The three big C's. Thats what decoupling essentially boils down to (at least for us).

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With this pair, we get a smooth sail throughout the whole board. With this setup, I found a 10uF cap on power in and power out pins works wonders. Now these are polarized, so make sure the back strip leg always heads towards ground.

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Now its time to check the current supply for the whole board. If there are any issues, best we work them out before adding (and, perhaps, frying) our microcontroller. The reading should be somewhere around 3.3 volts.

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