289 lines
11 KiB
Python
289 lines
11 KiB
Python
from machine import Pin, ADC, PWM, SPI
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from random import randint
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from math import floor, ceil
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from time import sleep
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__SYSTEM_PWM_FREQUENCY__ = 1000
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HIGH = 65535
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MID = HIGH / 2
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LOW = 0
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WAVEFORMS = ['sine', 'square', 'saw', 'triangle']
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# thank you rsta2 : https://github.com/rsta2/minisynth/blob/master/src/oscillator.cpp
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SINE_WAVE = [
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0.00000000, 0.01745241, 0.03489950, 0.05233596, 0.06975647, 0.08715574, 0.10452846, 0.12186934,
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0.13917310, 0.15643447, 0.17364818, 0.19080900, 0.20791169, 0.22495105, 0.24192190, 0.25881905,
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0.27563736, 0.29237170, 0.30901699, 0.32556815, 0.34202014, 0.35836795, 0.37460659, 0.39073113,
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0.40673664, 0.42261826, 0.43837115, 0.45399050, 0.46947156, 0.48480962, 0.50000000, 0.51503807,
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0.52991926, 0.54463904, 0.55919290, 0.57357644, 0.58778525, 0.60181502, 0.61566148, 0.62932039,
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0.64278761, 0.65605903, 0.66913061, 0.68199836, 0.69465837, 0.70710678, 0.71933980, 0.73135370,
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0.74314483, 0.75470958, 0.76604444, 0.77714596, 0.78801075, 0.79863551, 0.80901699, 0.81915204,
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0.82903757, 0.83867057, 0.84804810, 0.85716730, 0.86602540, 0.87461971, 0.88294759, 0.89100652,
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0.89879405, 0.90630779, 0.91354546, 0.92050485, 0.92718385, 0.93358043, 0.93969262, 0.94551858,
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0.95105652, 0.95630476, 0.96126170, 0.96592583, 0.97029573, 0.97437006, 0.97814760, 0.98162718,
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0.98480775, 0.98768834, 0.99026807, 0.99254615, 0.99452190, 0.99619470, 0.99756405, 0.99862953,
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0.99939083, 0.99984770, 1.00000000, 0.99984770, 0.99939083, 0.99862953, 0.99756405, 0.99619470,
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0.99452190, 0.99254615, 0.99026807, 0.98768834, 0.98480775, 0.98162718, 0.97814760, 0.97437006,
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0.97029573, 0.96592583, 0.96126170, 0.95630476, 0.95105652, 0.94551858, 0.93969262, 0.93358043,
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0.92718385, 0.92050485, 0.91354546, 0.90630779, 0.89879405, 0.89100652, 0.88294759, 0.87461971,
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0.86602540, 0.85716730, 0.84804810, 0.83867057, 0.82903757, 0.81915204, 0.80901699, 0.79863551,
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0.78801075, 0.77714596, 0.76604444, 0.75470958, 0.74314483, 0.73135370, 0.71933980, 0.70710678,
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0.69465837, 0.68199836, 0.66913061, 0.65605903, 0.64278761, 0.62932039, 0.61566148, 0.60181502,
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0.58778525, 0.57357644, 0.55919290, 0.54463904, 0.52991926, 0.51503807, 0.50000000, 0.48480962,
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0.46947156, 0.45399050, 0.43837115, 0.42261826, 0.40673664, 0.39073113, 0.37460659, 0.35836795,
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0.34202014, 0.32556815, 0.30901699, 0.29237170, 0.27563736, 0.25881905, 0.24192190, 0.22495105,
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0.20791169, 0.19080900, 0.17364818, 0.15643447, 0.13917310, 0.12186934, 0.10452846, 0.08715574,
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0.06975647, 0.05233596, 0.03489950, 0.01745241, 0.00000000, -0.01745241, -0.03489950, -0.05233596,
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-0.06975647, -0.08715574, -0.10452846, -0.12186934, -0.13917310, -0.15643447, -0.17364818, -0.19080900,
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-0.20791169, -0.22495105, -0.24192190, -0.25881905, -0.27563736, -0.29237170, -0.30901699, -0.32556815,
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-0.34202014, -0.35836795, -0.37460659, -0.39073113, -0.40673664, -0.42261826, -0.43837115, -0.45399050,
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-0.46947156, -0.48480962, -0.50000000, -0.51503807, -0.52991926, -0.54463904, -0.55919290, -0.57357644,
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-0.58778525, -0.60181502, -0.61566148, -0.62932039, -0.64278761, -0.65605903, -0.66913061, -0.68199836,
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-0.69465837, -0.70710678, -0.71933980, -0.73135370, -0.74314483, -0.75470958, -0.76604444, -0.77714596,
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-0.78801075, -0.79863551, -0.80901699, -0.81915204, -0.82903757, -0.83867057, -0.84804810, -0.85716730,
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-0.86602540, -0.87461971, -0.88294759, -0.89100652, -0.89879405, -0.90630779, -0.91354546, -0.92050485,
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-0.92718385, -0.93358043, -0.93969262, -0.94551858, -0.95105652, -0.95630476, -0.96126170, -0.96592583,
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-0.97029573, -0.97437006, -0.97814760, -0.98162718, -0.98480775, -0.98768834, -0.99026807, -0.99254615,
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-0.99452190, -0.99619470, -0.99756405, -0.99862953, -0.99939083, -0.99984770, -1.00000000, -0.99984770,
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-0.99939083, -0.99862953, -0.99756405, -0.99619470, -0.99452190, -0.99254615, -0.99026807, -0.98768834,
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-0.98480775, -0.98162718, -0.97814760, -0.97437006, -0.97029573, -0.96592583, -0.96126170, -0.95630476,
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-0.95105652, -0.94551858, -0.93969262, -0.93358043, -0.92718385, -0.92050485, -0.91354546, -0.90630779,
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-0.89879405, -0.89100652, -0.88294759, -0.87461971, -0.86602540, -0.85716730, -0.84804810, -0.83867057,
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-0.82903757, -0.81915204, -0.80901699, -0.79863551, -0.78801075, -0.77714596, -0.76604444, -0.75470958,
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-0.74314483, -0.73135370, -0.71933980, -0.70710678, -0.69465837, -0.68199836, -0.66913061, -0.65605903,
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-0.64278761, -0.62932039, -0.61566148, -0.60181502, -0.58778525, -0.57357644, -0.55919290, -0.54463904,
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-0.52991926, -0.51503807, -0.50000000, -0.48480962, -0.46947156, -0.45399050, -0.43837115, -0.42261826,
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-0.40673664, -0.39073113, -0.37460659, -0.35836795, -0.34202014, -0.32556815, -0.30901699, -0.29237170,
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-0.27563736, -0.25881905, -0.24192190, -0.22495105, -0.20791169, -0.19080900, -0.17364818, -0.15643447,
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-0.13917310, -0.12186934, -0.10452846, -0.08715574, -0.06975647, -0.05233596, -0.03489950, -0.01745241
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]
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VOCT_PITCH_VALUES = [0.1, 0.2, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7]
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# VOCT_PITCH_VALUES[x] * 65535 = our random pitch
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# the format for specifying synthesizer configuration
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SYNTH_CONFIG = {
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# valid member types: analog in, digital in
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"inputs": [],
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# valid member types: digital out, PWM out
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"outputs": [],
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# specifies the ways each module on the synthesizer should behave
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"module_config": {
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# modules A and B will have a different hardware configuration
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"A": {},
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"B": {},
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"C": {},
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"D": {}
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}
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}
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def blink(controller: type[ADC], target=Pin(25, Pin.OUT), sleep_duration = 1000):
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if not controller: pass
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# POT.read_u16() / 65535 approaches 0 as potentiometer approaches max,
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# approaches 1 as potentiometer approaches min
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modulated_sleep = max(floor(sleep_duration * (controller.read_u16()) / 65535), 5) / 1000
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target.value(1)
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sleep(modulated_sleep)
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modulated_sleep = max(floor(sleep_duration * (controller.read_u16()) / 65535), 5)
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target.value(0)
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sleep(modulated_sleep)
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# convert input from -1 to 1 range, to u16
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def polar_to_u16(input: float) -> int:
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return floor((input + 1) * 32767.5)
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# convert input from u16 to -1 to 1 range
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def u16_to_polar(input: int) -> float:
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return (input / 32767.5) - 1
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""" " " " " " " " " " " " " " " " " " " " " " "
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" BEGIN CLASS DEFINITIONS FOR BASIC HARDWARE BEHAVIORS
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_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ """
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# for representing and interacting with waveform data
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class Hertz:
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ONE_HERTZ = len(SINE_WAVE) / 1000
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def __init__(self, hz: int):
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self.hz = hz
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self.tick_freq = self.ONE_HERTZ * hz
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pass
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# basic set of analog input behaviors
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class AnalogInput:
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def __init__(self, ADC_PIN):
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self.PIN = ADC(ADC_PIN)
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self.value = 0
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def read(self):
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self.value = self.PIN.read_u16()
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return self.value
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def read_polar(self):
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self.value = self.PIN.read_u16() / 65535
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return self.value
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class Potentiometer(AnalogInput):
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def __init__(self, ADC_PIN: int):
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super().__init__(ADC_PIN)
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# output behaviors and utilities
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class PWMOutput:
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def __init__(self, PIN: int, duty: int = 512):
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new_pwm = PWM(Pin(PIN))
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new_pwm.freq(__SYSTEM_PWM_FREQUENCY__)
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self.PWM = new_pwm
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self.duty = duty
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def set_duty(self, duty: int):
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self.PWM.duty_u16(duty)
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return self.PWM.duty_u16()
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def get_duty(self):
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return self.PWM.duty_u16()
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def get_freq(self):
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return self.PWM.freq()
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def set_freq(self, freq: int):
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self.PWM.freq(freq)
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class DigitalOut:
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def __init__(self, PIN: int):
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self.PIN = Pin(PIN, Pin.OUT)
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def read(self):
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return self.PIN.value()
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"""
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DEFINITIONS FOR HARDWARE PERIPHERALS
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"""
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# adapted from MCCP3008 class by @romilly, which was adapted from Adafruit CircuitPython driver
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# source: https://github.com/romilly/pico-code/blob/master/src/pico_code/pico/mcp3008/mcp3008.py
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class MCP3008:
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def __init__(self, spi: SPI, chip_select: Pin, ref_voltage=3.3):
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self.chip_select = chip_select
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self.chip_select.value(1)
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self._spi = spi
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self._out_buffer = bytearray(3)
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self._out_buffer[0] = 0x01
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self._in_buffer = bytearray(3)
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self._ref_voltage = ref_voltage
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def get_voltage(self):
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return self._ref_voltage
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def read(self, pin):
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self.chip_select.value(0)
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self._out_buffer[1] = pin << 4
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self._spi.write_readinto(self._out_buffer, self._in_buffer)
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self.chip_select.value(1) # turn off
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return ((self._in_buffer[1] & 0x03) << 8) | self._in_buffer[2]
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class Oscillator:
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def __init__(self, waveform = 'sine', downsampling: int = 0, current_tick: int = 0) -> None:
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self.waveform = waveform if waveform in WAVEFORMS else None
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self.downsampling = downsampling
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self.current_tick = current_tick
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self.value = 0
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def out(self):
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if (self.waveform is 'square'):
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self.value = not self.value
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else:
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current_step = SINE_WAVE[floor(self.current_tick)]
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interval = self.downsampling if self.downsampling > 0 else 1
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self.current_tick = self.current_tick + interval if self.current_tick + interval < len(SINE_WAVE) else 0
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return current_step
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class Synthesizer:
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# PIN CONFIGURATION
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p1 = None # GP0
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p2 = None # GP1
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# p3 = GND
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p4 = None # GP2
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p5 = None # GP3
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p6 = None # GP4
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p7 = None # GP5
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# p8 = GND
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p9 = None # GP6
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p10 = None
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p11 = None
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p12 = None
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# p13 = GND
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p14 = None # GP10
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p15 = None
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p16 = None
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p17 = None
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# p18 = GND
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p19 = None # GP14
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p20 = None
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p21 = None
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p22 = None
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# p23 = GND
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p24 = None # GP18
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p25 = None
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p26 = None
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p27 = None
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# p28 = GND
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p29 = None # GP22
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# p30 = RUN
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p31 = None # GP26, ADC0
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p32 = None # GP27, ADC1
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# p33 = GND, AGND
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p34 = None # GP28, ADC2
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p35 = None # ADC_VREF
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# p36 = 3v3(out)
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# p37 = 3V3_EN
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# p38 = GND
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# p39 = VSYS
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# p40 = VBUS
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def __init__(self, config):
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self.config = config
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gate_out = PWMOutput(15, 0)
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voct_out = PWMOutput(16, 0)
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# spi = SPI(0, sck=Pin(2), mosi=Pin(3), miso=Pin(4), baudrate=100_000)
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# chip_select = Pin(22, Pin.OUT)
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# chip_select.value(1)
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# square = Pin(21, Pin.OUT)
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# mcp = MCP3008(spi, chip_select)
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cv_one = PWMOutput(16)
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led_one = PWMOutput(17)
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pot = Potentiometer(0)
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osc = Oscillator('sine', 32)
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timer = 1
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sleep_interval = 0.01
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try:
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while True:
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current_step = polar_to_u16(osc.out())
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led_one.set_duty(current_step)
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cv_one.set_duty(current_step)
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sleep(0.001 + (pot.read_polar() / 32))
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except KeyboardInterrupt:
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print("Exiting program...")
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led_one.set_duty(0)
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cv_one.set_duty(0)
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