space_invader_scope.py

from machine import Pin, ADC
import array
from rp2 import PIO, StateMachine, asm_pio
import uctypes
from uctypes import BF_POS, BF_LEN, UINT32, BFUINT32, struct
from math import floor, ceil
from time import sleep
import _thread
import gc



invader   =   [[0,0,1,0,0,0,0,0,1,0,0]]
invader.append([0,0,0,1,0,0,0,1,0,0,0])
invader.append([0,0,1,1,1,1,1,1,1,0,0])
invader.append([0,1,1,0,1,1,1,0,1,1,0])
invader.append([1,1,1,1,1,1,1,1,1,1,1])
invader.append([1,0,1,1,1,1,1,1,1,0,1])
invader.append([1,0,1,0,0,0,0,0,1,0,1])
invader.append([0,0,0,1,1,0,1,1,0,0,0])


@asm_pio(out_init=(PIO.OUT_LOW, PIO.OUT_LOW,PIO.OUT_LOW,PIO.OUT_LOW,PIO.OUT_LOW,PIO.OUT_LOW,PIO.OUT_LOW,PIO.OUT_LOW, PIO.OUT_LOW,PIO.OUT_LOW,PIO.OUT_LOW,PIO.OUT_LOW,PIO.OUT_LOW,PIO.OUT_LOW), out_shiftdir=PIO.SHIFT_RIGHT)
def two_seven_bit_dac(): # also want FIFO join.
    wrap_target()
    label("loop")
    pull()
    out(pins, 14) [10]
    jmp("loop")
    wrap()


data_position = 0

def add_point(data, x, y):
    data.append(x << 7 | y)
    
def draw_invader(data, x, y):
    for i in range(len(invader)):
        for j in range(len(invader[i])):
            if invader[i][j] == 1:
                add_point(data, x+j, y-i)
    
def draw_square(data, x1, y1, x2, y2, points_per_line):
    width_inc = (x1-x2) / points_per_line
    height_inc = (y1-y2) / points_per_line
    for i in range(points_per_line):
        add_point(data, x1, int(y2+i*height_inc))
    for i in range(points_per_line):
        add_point(data, x2, int(y2+i*height_inc))
    for i in range(points_per_line):
        add_point(data, int(x2+i*width_inc), y1)
    for i in range(points_per_line):
        add_point(data, int(x2+i*width_inc), y2)
    
data=[]
draw_invader(data, 0,0)


sm = rp2.StateMachine(0, two_seven_bit_dac, freq=100000, out_base=Pin(0))
sm.active(1)

packed_data = array.array('I', [0 for _ in range(len(data))])
for i in range(len(data)):
    packed_data[i] = data[i]

def second_core():
    global packed_data
    
    x_direction = 1
    y_direction = 1
    
    x = 20
    y = 0

    while True:
        x = x+x_direction
        y = y+y_direction
        if (x > 70) :
            x = 70
            x_direction = -1
        if (x < 0):
            x_direction = 1
            x=0
            
        if (y > 70) :
            y = 70
            y_direction = -1
        if (y < 0):
            y_direction = 1
            y=0
        second_data = []
        gc.collect() # needed!
        draw_invader(second_data, x, y)
        
        for i in range(len(second_data)):
            packed_data[i] = second_data[i]
        sleep(0.1)

_thread.start_new_thread(second_core, ())

while True:
    sm.put(packed_data,0)