Extreme prototyping using command on dev board

Description

Many times, I want to fast prototype my project using python on my computer and use libs only available to a computer at the moment. I just want my micro-controller board to be an I/O interface to other hardware devices.
I created a command parser on a micro-controller board supporting the following features.

* General Purpose Input Out (GPIO)
* Digital-to-Analog Converter (DAC)
* Analog-to-Digital Converter (ADC)
* Power Width Modulation (PWM)
* Saving/loading configuration to/from internal nonvolatile memory

The command parser is powerful, fast and at the same time very tiny. It is not as hardware demanding as the micro-python. I'm considering to port the implementation to ATmega328 boards in the future but need your likes to motivate me.

Documents (API, schematics, gerbers, datasheets): https://www.exaberry.org/devices/documentation/0ea9052a3539/1.0/api/

Details

Set GPIO value

> write gpio.1.mode=ouput
> write gpio.1.value=1

To update the GPIO pin value, first set the GPIO mode to be outoput and then update the pin value to be the desired value.

Read GPIO value

> write gpio.1.mode=input
> read gpio.1.value

To read the GPIO pin value, set the GPIO mode to be input and then read pin value.

Read ADC input value

> write adc.1.mode=on
> read adc.1.value

Turn on the Analog-to-Digital Converter (ADC) on pin 1 and then read the converted digital value of the voltage on pin 1. The voltage range on an ADC pin should be from 0V to 3.3V

Analog output by DAC

> write dac.11.mode=on
> write dac.11.value=1000

Turn on the Digital-to-Analog Converter (DAC) on pin 11. Write the output value to the DAC. The DAC will convert the given digital value to a voltage in the range from 0V to 3.3V on the pin 11. The range of the digital value should be from 0 to 4095.

Set PWM output

> write pwm1.period=1024
> write pwm1.prescaler=1
> write pwm1.1.duty=0.5
> write pwm1.1.mode=on

pwm1.period defines the period counter of PWM 1. pwm1.prescale is the prescaler of the PWM 1 clock. The period of output wave is defined by both the period counter and the prescaler. pwm1.1.duty=0.5 makes the output wave 50% high and 50% low. Finally, turn on the output on pin 1 by setting the mode to be on