stm32L433CCT6, will program through the USB, however, no debug... #55
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Stipulated that the EAGLE CAD schematic for Butterfly is not great.
STM32 MCUs do not require 22R terminators on the USB data lines. I use a
HSP-061 TVS diode as recommended by ST but this is also not really required.
We employ a GPIO (PB2) as USB detect to shut down the USB controller when
USB is not detected. Did you connect this in your design?
…On Sun, Dec 1, 2024 at 9:39 PM joey120373 ***@***.***> wrote:
I built a board based on the Butterfly, much of the schematic was borrowed
from the butterfly schematics. I added a DCDC converter and a couple extra
connections, and put it on a RPi2040 type board form factor. I am able to
get a sketch to load just fine, blink for example, and everything works
great, love the low power!
However, when i load a simple UART scetch, like the "ASCII TABLE" arduino
example scetch, it loads fine, but no Serial port ever shows up. I have
tried on both my widows machine and My MAC.
The Butterfly board schematics were relatively hard to read when in
regards to the USB connection, there appears to be a TVS diode, and a
second component??, its this second component that illudes me, it appears
to be passive, so im assuming its just a resistor set? I borrowed the
circuit from a DUE schem for the protection. a couple 22ohm resistors and a
couple inductors, Im wondering if this could be causing the issue?
I did make sure that the USB data lines were the same length, and have a
nice straight shot to the STM pins, but im no EE, so its possible there it
may be just a bad design. But since it (they) programs fine ( all three
boards i built, actually ) I am assuming that the USB is at least somewhat
functional.
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Ahh, could be, I put a jumper from "VBus" ( USB +5v ) to pin PB2, I must have put that there because I didn't understand what that was for, so possibly all i need to do is close that jumper so that PB2 is high when USB is connected? |
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Maybe...at least this is one thing I know could cause your trouble...
…On Fri, Dec 6, 2024 at 7:09 PM joey120373 ***@***.***> wrote:
Ahh, could be, I put a jumper from "VBus" ( USB +5v ) to pin PB2, I must
have put that there because I didn't understand what that was for, so
possibly all i need to do is close that jumper so that PB2 is high when USB
is connected?
Thanks, ill give that a try.
Joe
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Yep! that did it, I designed this board as a quick and dirty trial run to see if i could simply just swap controllers on an existing board. I wanted to play around little bit though, without getting too deep into the feature creep. |
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glad it worked for you!
…On Sat, Dec 7, 2024 at 4:44 PM joey120373 ***@***.***> wrote:
Yep! that did it, I designed this board as a quick and dirty trial run to
see if i could simply just swap controllers on an existing board. I wanted
to play around little bit though, without getting too deep into the feature
creep.
I don't remember exactly why I added the jumper, but i think I was being
cautious with jamming 5+v onto a controller pin ( even if it is a 5v
compatable pin ). In any case, I added a configurable power supply, i can
choose either a pico inspired buck/boost converter, or the LDO used on the
butterfly. I settled on a pico form factor just for kicks, and I added a
Adafruit "EYESPI" FFC connector to the end just cause why not.
The project this will be added to, I desoldered the ATMEGA328 ( running at
8Mhz ) and wired up the STM32L433 board to the signals im using : SPI, IIC
and a half doezen digital IO pins. I figured i was in for a lot of hair
pulling getting the code ported over, but !!! I literally just changed the
board type in arduino, hit send and waited for the laundry list of compiler
errors to show up.......to my suprise, it compiled, loaded and the board
just works! 10 times the clock speed, lower power and 32 bit goodness. You
guys have done a great job on this, cant thank you enough. The board is a
loop powered 4-20mA transmitter, it uses a I2C DAC to control the current,
an I2C ADC to monitor the current, and a rotory encoder and an SPI LCD for
user interface. The ATMEGA was fine, but just, and i was running out of
room for the code. This helps on all fronts, it gives more headroom to keep
the min current below 4mA, and i now have more room for code to add some
much needed functionality.
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I built a board based on the Butterfly, much of the schematic was borrowed from the butterfly schematics. I added a DCDC converter and a couple extra connections, and put it on a RPi2040 type board form factor. I am able to get a sketch to load just fine, blink for example, and everything works great, love the low power!
However, when i load a simple UART scetch, like the "ASCII TABLE" arduino example scetch, it loads fine, but no Serial port ever shows up. I have tried on both my widows machine and My MAC.
The Butterfly board schematics were relatively hard to read when in regards to the USB connection, there appears to be a TVS diode, and a second component??, its this second component that illudes me, it appears to be passive, so im assuming its just a resistor set? I borrowed the circuit from a DUE schem for the protection. a couple 22ohm resistors and a couple inductors, Im wondering if this could be causing the issue?
I did make sure that the USB data lines were the same length, and have a nice straight shot to the STM pins, but im no EE, so its possible there it may be just a bad design. But since it (they) programs fine ( all three boards i built, actually ) I am assuming that the USB is at least somewhat functional.
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