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Bootloader Flashing Tool.  


mario
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Just want to show my solution for flashing the Bootloader, if it is necessary. I used a piece of prototyping pcb some pin headers and a piece of a croco clamp. The clamp is used to connect the reset pin.

IMG 20200311 193625
IMG 20200311 193644
IMG 20200311 193636
IMG 20200311 193538
IMG 20200311 193556

In my opinion this is a much more convenient way to flash the FabScanPi Bootloader.

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trife
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Looking at that compared to the one listed currently using a pi 

 

You got more wires, and different locations.... 

 

I kinda wonder if something is missing from the current directions for using a pi 

 

Is that using an Arduino? 

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mario
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Posted by: @trife

Is that using an Arduino? 

Does not matter what you connect at the other end. This solution fits both. Pi and Arduino. But in my case i am using a real isp programmer with a 10 pin connector. The end where the bunch of cables ends, should have either feamale connectors for the raspberry pi or male pin connector for an arduino.

Posted by: @trife

You got more wires, and different locations.... 

Not all of the wires are connected. I just used this kind of cable to keep the wiring cleaner.

Posted by: @trife

I kinda wonder if something is missing from the current directions for using a pi 

The Pi solution is fine. Have a closer look to the pictures, what you see is my adapter solution connected to the HAT. 

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trife
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@mario

 

Haha I see 

The other question would be 

The resistor values 

Are they 2k and 5k 

Or are they 2.2k and 5.6k 

The 2k2 and 5k6 in series, there's nothing special or anything just those two values tied together attached to the cable being used? 

 

And if the hat is connected and the pins added to the setup.... Should we be flashing it with a separate pi using the pi power supply, or just use the one your using... 

 

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mario
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Posted by: @trife

Are they 2k and 5k 

Or are they 2.2k and 5.6k 

The notation means that you can use resistors with values between 2k and 5.6k. 

Posted by: @trife

And if the hat is connected and the pins added to the setup.... Should we be flashing it with a separate pi using the pi power supply, or just use the one your using... 

Detach the HAT from the Raspberry Pi. Connect the Pi like the wiring diagram shows it. But the HAT also needs a 5V power connection. 

5V Raspberry Pi < ---- > 5V HAT (e.g. VIO motor driver pin). 

GND Raspberry Pi <----> GND HAT ( e.g. GND of the motor driver pin)

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trife
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Tried that method 

Pi and hat separated, pi powered with pi power supply , hat powered with jumpers from the pi 

Still no go, the same errors consecutively... however a pi undervolt condition warning pops up on the screen after starting the process and failing the first time (second attempt undervolt)

I was just about to message watterott when they messaged me with regards to shipping 2 new boards

This is a perplexing little problem indeed

Hopefully the new boards will work out 🙂 

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moop
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The following might help to clarify a few things:

Marios photos above serve to illustrate the connections to the PI-HAT for FLASHING the bootloader. The most problematic connection is to the RESET on the PI_HAT as it isnt broken-out anywhere, it is routed to the reset switch and is tricky to solder to (hence the alligator clip). All other communication to the ATmega328 can be routed from the M3 Header (see schematic or description below). While you can use many different programmer techniques to FLASH the bootloader, the instructions from Watterott (Bootloader Instructions) use the RPI.

The following 4 data connections need to be made between the PI and the PI HAT. All data connections should use a 2.2K to 5K resistor to protect the devices from over curent. Reference Schematic .

RPi (40 pin)-> ATmega328
------------------
IO25 (19) -> Reset (PC6, pin 29 of ATMega328 attach clip on left side (40 pin header side) of reset button)
IO11 (18) -> SCK (PB5, pin 17 of ATMega328 wired to M3_DIR_D13)
IO10 (22) -> MOSI (PB3, pin 15 of ATMega328 wired to M3_EN_D11)
IO9 (20) -> MISO (PB4, pin 16 of ATMega328 wired to M3_STEP_D12)

 

These need to be connected if the HAT is not plugged into the PI

 

GND (21*) -> GND (all GND is the same on the HAT)
5v+ -> 5V+
*pi 40 pin GND on pns 2,7,11,16,21,27,32,35

If the PI_HAT is plugged into the RPI, then a provision to breakout RPI pins 18, 19, 20, 22 needs to be made. otherwise you can use jumpers from the RPI to the PI_HAT provided you include 5V+ and GND

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