#!/usr/bin/python3
# -*- coding: UTF-8 -*-
# vim:fileencoding=UTF-8:ts=4

import sys
import array
import time
import gc

class PulseGenerator:

    def __init__(self):
        self.timing = array.array('l', (0 for _ in range(64)))  # int32_t

    @staticmethod
    def pulse_high(width=1_000_000): # 1ms
        t0 = time.time_ns() + width
        #
        # set GPIO high
        #
        while time.time_ns() < t0:
            pass
        t1 = time.time_ns()
        return t1 - t0

    @staticmethod
    def pulse_low(width=1_000_000): # 1ms
        t0 = time.time_ns() + width
        #
        # set GPIO low
        #
        while time.time_ns() < t0:
            pass
        t1 = time.time_ns()
        return t1 - t0

    def pulsetrain(self, value, length):
        for idx in range(length):
            if value & 1:
                delta = PulseGenerator.pulse_high()
            else:
                delta = PulseGenerator.pulse_low()
            value >>= 1
            self.timing[idx] = delta

    def show_timing(self, length):
        min_µs = min(self.timing) / 1000.0
        max_µs = max(self.timing) / 1000.0
        avg_µs = sum(self.timing) / length  / 1000.0
        flag = 'X' if max_µs > 10 else '-'  # mark if deviation is higher than 10µs
        print(f'Delta (64 × 1ms pulses): min:{min_µs:6.1f}µs   avg:{avg_µs:6.1f}µs   max:{max_µs:6.1f}µs  {flag}')



NUM_LOOPS = 1000

pulse = PulseGenerator()

# define 64bits (pulses)
pulsedef = 0
pulsedef <<= 16
pulsedef += 0b_1111_0000_1100_1111
pulsedef <<= 16
pulsedef += 0b_1111_0000_1100_0111
pulsedef <<= 16
pulsedef += 0b_1111_0000_1100_0011
pulsedef <<= 16
pulsedef += 0b_1111_0000_0000_0001
print(bin(pulsedef))

gc.collect()
for _ in range(NUM_LOOPS):
    pulse.pulsetrain(pulsedef, 64)
    pulse.show_timing(64)