RadAsm30 Files

STM32G431CBU6 USB scope and waveform generators.
------------------------------------------------
o Digital scope, waveform generator and PWM generator
o Easy build
  - Low component count
    All analog and digital parts contained in MCU
  - Buildt on Veroboard, no etching and drilling

BOM
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MCU:
1 x STM32G431CBU6 long board from WeAct studio

Resistors:
1 x 470K
1 x 330K
2 x 100K
1 x 100R

Capacitors:
1 x 1uF
1 x 100nF
1 x 47pF
1 x 40pF trimmer

Reed relay:
1 x SIP05

PCB:
1 x Veroboard

Connectors:
2 x 24 pin female headers
1 x BNC connector (optional)
2 x RCA connectors (optional 4 pin male header)

Cost:
To reduce cost you can use a 4 pin male header for
the HS Clock and Wave generator. You can also create
your own scope probe using a ballpoint or felt tip pen
housing, a 330 ohm resistor and a tv antenna cable.
Then you dont need any connector for the probe.
See Probe.jpg

Build
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See: PCB.pdf or Schma.cad if you are using RadSTM32
1. Cut the Veroboard to size
2. Solder the two 24 pin headers
   Bend the pins before soldering. This makes
   it easier to solder. Solder only the named pins.
3. Cut all the tracks that needs to be cut. Be
   careful to cut the right tracks at the right
   positions.
4. Solder all the jumper wires.
5. Solder the resistors, capacitors, reed relay
   and connection wires. The scope wire should be
   a shielded wire.
6. Inspect and test for solder bridges and bad
   soldering.
7. Program the MCU with the G431_USB_Scope.bin file.
8. Insert the MCU and test. Note that the scope ground
   wire has the vertical position voltage. Do not
   connect it to ground. Doing so will not do any harm
   but the scope will not work properly.

Adjusting the trimmer capacitor
-------------------------------
1. Connect the HS Clock output to the Scope input
   Do not connect the ground wire.
2. Set the HS Clock to 1 KHz, 50% duty cycle.
3. Set the scope to 500mV and 5uS. Leave all the others
   to their default value.
4. Adjust the trimmer until you get a nice 3.3V squear wave.

Software error corrections
--------------------------
The Scope.h file has two valuses that might need to
be changed. The values can be positive or negative.
SCPVPOSERR: Correct the scope vertical position.
SCPTPOSERR: Correct the scope trigger position.

Specifications
--------------
Scope:
o Sensivity
  - 50mV to 2V / Div in 1 2 5 steps
o Coupling
  - AC and DC
o Probe
  - X1 and X10 with a probe
  - X1 with a DIY probe
o Timebase
  - 25ns to 500ms in 1 2.5 5 steps
o Horizontal position
  - -50 to +50 pixels
  - Pre trigger
o Vertical position
  - +/- 8V
o Trigger position
  - +/- 8V
o Trigger hysteresis
  - 0 to 70mV in 10mV steps
o Trigger filter
  - 16 filter positions
o Trigger edge
  - Rising, falling or nonr
o Hold
  - Frezes the captured wave
o Single shot
  - Can only be uset in normal mode
  - 5K buffer
  - Useful when capturing non repetitive waves
    or when a stedy trigger cannot be obtained
o Modes
  - Sliding wave mode
    250ms and 500ms / Div
  - Normal mode
    5us to 100ms / Div
  - Fast mode
    25ns to 2.5us / Div
    Minimum input frequency 100KHz
    Maximum input frequency 10MHz
    Worst case sampling rate 60MHz
    Best case sampling rate 400MHz

HS Clock:
o Frequency
  - 1Hz to 24MHz
  - Resolution
    Any frequency that can be obtained
    by dividing the 120 MHz clock
o Duty cycle
  0 to 100%

Waveform generator:
o Waveforms
  - Off, sine, triangle, squear, sawtooth,
    reverse sawtooth and DC Out
o Frequency
  - 1Hz to 20KHz in 1 2 5 steps
o Amplitude 1st harmonic
  - 0 to 100% (max 3.3V)
o Amplitude 2nd harmonic
  - 0 to 100% (max 3.3V)

Conclusion:
Great tool for the hobbyist and those lerning
about electrinics and microcontrollers.
This cheap and easy build has limitations on
the scoppe due to noise on the 100mV and 50mV
ranges. But as long as you are aware of this
it should not cause any problems.

KetilO