Create a entry frame to include:

1. 2 Radio button (clockwise, counterclockwise)
2. rpm label and rpm entry.
3. step label and step entry.
4. 2 buttons, (start, stop)
   start: start running
   stop: terminate running

Requirement: select a STM32 microcontroller with 7MHZ running frequency, 4KB RAM, 32KB flash.
Modification: select STM32L071CBTx based on my hardware board(8M HSE, 20KB RAM, 128KB flash), configure the running frequency to 6MHZ, and only use 4KB RAM, 32KB flash.
ports:

1. usart1 with interrupt and callback enabled
2. 3 pins: step/dir/enable (use the 3 leds ports: PB5, PB6, PB7)
3. clock OSC in (8M)

Add AES encryption in python GUI transmitter.
Add decryption in microcontroller to decrypt the message.
Debug the system with encrypted communication.

There are 3 paramters can be defined by user:

1. running PRM
2. how many steps to run
3. direction (clockwise, counterclockwise)
   Initial design the sturcture of the command structure is Direction, PRM, STEP
   Implement USART receiver, and data processing function to accept the command and then run the command.
   Debug with sscom.

Send command with python GUI
Receive command with STM32 microcontroller
Control step motor with 3 pins
Monitor 3 pins with logic analyzer

Configure the project with compiler gcc and debug tool openocd.
Debug simulator is STLINK2.
Create sourcecode structure:
root(src + target + script)
src(app + common)
app(app_main.h/c etc)
target(stepmotor)

The motor is 18 degrees per step (20 steps per revolution)
Constraints: The stepper motor cannot do more than 600 RPM
600 RPM -> 10 RPS -> at least 100ms for one revolution -> 5ms one step
As uTick of this microcontroller is 10 milliseconds, which is slower than the requirement, a timer is needed here
Assume PRM_NUM is defined by user, this number is between 1 to 600 (1 <= PRM_NUM <= 600)
Calculation:
one step period (ms) = (60 * 1000ms) / (PRM_NUM * 20) = 3000/PRM_NUM