# pyboard testing functions for CPython
import time


def delay(n):
 # time.sleep(float(n) / 1000)
 pass


rand_seed = 1


def rng():
 global rand_seed
 # for these choice of numbers, see P L'Ecuyer, "Tables of linear congruential generators of different sizes and good lattice structure"
 rand_seed = (rand_seed * 653276) % 8388593
 return rand_seed


# LCD testing object for PC
# uses double buffering
class LCD:
 def __init__(self, port):
 self.width = 128
 self.height = 32
 self.buf1 = [[0 for x in range(self.width)] for y in range(self.height)]
 self.buf2 = [[0 for x in range(self.width)] for y in range(self.height)]

 def light(self, value):
 pass

 def fill(self, value):
 for y in range(self.height):
 for x in range(self.width):
 self.buf1[y][x] = self.buf2[y][x] = value

 def show(self):
 print("") # blank line to separate frames
 for y in range(self.height):
 for x in range(self.width):
 self.buf1[y][x] = self.buf2[y][x]
 for y in range(self.height):
 row = "".join(["*" if self.buf1[y][x] else " " for x in range(self.width)])
 print(row)

 def get(self, x, y):
 if 0 <= x < self.width and 0 <= y < self.height:
 return self.buf1[y][x]
 else:
 return 0

 def pixel(self, x, y, value):
 if 0 <= x < self.width and 0 <= y < self.height:
 self.buf2[y][x] = value