Back
Microbit files
This is the code for the BBC microbit, which needs to be flashed to the Microbit. It was done using the 'Mu' program and seemed to work well when it was done from an Ubuntu system, but only sometimes when from anything else...(?!)
from microbit import *
validImages = [
"HEART", "HEART_SMALL", "HAPPY", "SMILE", "SAD",
"CONFUSED", "ANGRY", "ASLEEP", "SURPRISED", "SILLY",
"FABULOUS", "MEH", "YES", "NO", "CLOCK12" , "CLOCK11" ,
"CLOCK10" , "CLOCK9" , "CLOCK8" , "CLOCK7" , "CLOCK6" ,
"CLOCK5" , "CLOCK4" , "CLOCK3" , "CLOCK2" , "CLOCK1",
"ARROW_N" , "ARROW_NE" , "ARROW_E" , "ARROW_SE" ,
"ARROW_S" , "ARROW_SW" , "ARROW_W" , "ARROW_NW",
"TRIANGLE", "TRIANGLE_LEFT", "CHESSBOARD", "DIAMOND",
"DIAMOND_SMALL", "SQUARE", "SQUARE_SMALL", "RABBIT",
"COW", "MUSIC_CROTCHET", "MUSIC_QUAVER", "MUSIC_QUAVERS",
"PITCHFORK", "XMAS", "PACMAN", "TARGET", "TSHIRT",
"ROLLERSKATE", "DUCK", "HOUSE", "TORTOISE", "BUTTERFLY",
"STICKFIGURE", "GHOST", "SWORD", "GIRAFFE", "SKULL",
"UMBRELLA", "SNAKE"]
validPatterhChars = ['0','1','2','3','4','5','6','7','8','9',':']
uart.init(115200)
display.show(Image.HAPPY)
while True:
# wait for a signal on the usb line to start
while uart.any() == 0:
pass
# wait a short time to allow it all to be received
sleep(10)
# read it into an array of binary values
binary = uart.readline()
# convert from binary values into an ASCII string
# there is probably a much nicer way to do this...
text = ""
for i in range(len(binary)):
text += chr(binary[i])
text = text.strip()
# the protocol is that the first character will tell the microbit
# what to do with the rest of the informatiom
# In all cases the microbit will respond with
# the current state of the sensors
if len(text) > 0:
response = ""
# always send a status response
if button_a.is_pressed():
response += "A:1;"
else:
response += "A:0;"
if button_b.is_pressed():
response += "B:1;"
else:
response += "B:0;"
print(response)
# decide what to do based on the first character
if text[0].lower() == 's':
# this means scroll the message
message = text[1:]
display.scroll(message)
elif text[0].lower() == 'i':
# this means use a standard image - check it is a valin name first
if text[1:].upper() in validImages:
eval("display.show(Image." + text[1:].upper() + ")")
elif text[0].lower() == 'c':
# clear the screen
display.clear()
elif text[0].lower() == 'p':
display.clear()
# make an image from the patterns, if they look ok
pattern = text[1:]
if len(pattern) == 29:
ok = True
# check for only valid characters
for letter in pattern:
if not letter in validPatterhChars:
ok = False
break
# check the : characters are in the right place
# positions 5,11,17,23
for i in range(5,24,6):
if pattern[i]!= ':':
ok = False
break
if ok:
im = Image( pattern)
display.show(im)
else:
# ignore anything unexpected
pass
And this is the code for the robot, which is in the 'lib' folder (called microbit_comms.py)and is imported as 'mbt' into the program.
from __future__ import absolute_import, division, print_function
import serial
import time
import threading
ser = serial.Serial('/dev/ttyACM0', 115200, timeout=1)
cmd = "?"
status = ["0","0"]
run = True
# function for the buttons so that
# they have a callback assigned
def DoNothing():
pass
# default buttons to do nothing
buttonA = DoNothing
buttonB = DoNothing
def SetButtonCallback(button, func):
global buttonA
global buttonB
if button=="A":
buttonA = func
if button=="B":
buttonB = func
def Close():
global run
run = False
def SendAndReceive():
global ser
global cmd
global buttonA
global buttonB
global run
lastCmd = "none"
while run:
thisCmd = "?"
if cmd != lastCmd:
lastCmd = cmd
thisCmd = cmd
ser.write(cmd.encode("utf-8"))
else:
ser.write("?".encode("utf-8"))
rcvd = ser.readline()
text = rcvd.strip().decode("utf-8")
#print(text)
new_status = text.split(';')
#print(new_status)
try:
A = new_status[0][2]
B = new_status[1][2]
if A == "1" and status[0] == "0":
# fire the procedure
buttonA()
if B == "1" and status[1] == "0":
# fire the procedure
buttonB()
status[0] = A
status[1] = B
except:
print("Can't process response from microbit:" ,text)
time.sleep(0.1)
# print(status)
ser.close()
def ShowImage(name):
global cmd
cmd = 'i'+name
# SendAndReceive(cmd,ser)
def ShowPattern(img):
global cmd
temp = img.split(':')
res = ""
if len(temp) == 5 and len(img) == 29:
res = img
else:
res = "00000:00000:00900:00000:00000"
cmd = 'p'+res
#SendAndReceive(cmd,ser)
def ScrollText(text):
global cmd
cmd = 's'+text
#SendAndReceive(cmd,ser)
def GetButtons():
cmd = '?'
#text = SendAndReceive(cmd,ser)
#return text
def Interactive():
global cmd
while True:
print("""Enter options:
s = scroll text
i = display standard image
p = display image pattern (5 blocks of 0-9, separated by :)
c = clear microbiy display
? = read button state
@ = monitor button state for 4 secs
q = quit
""")
choice = raw_input().lower()
if choice == 's':
text = raw_input("Enter text to scroll: ")
cmd = 's'+text
elif choice == 'i':
text = raw_input("Enter image name: ")
cmd = 'i'+text
elif choice =='c':
cmd = 'c'
elif choice == 'p':
text = raw_input("Enter pattern: ")
if len(text) == 0:
text = "90909:09090:90909:09090:90909"
cmd = 'p'+text
elif choice == '@':
start = time.time()
cmd = '?'
#while time.time() <= start + 4:
# SendAndReceive(cmd,ser)
elif choice == 'q':
print("Quitting interactive mode")
break
else:
cmd = '?'
#SendAndReceive(cmd,ser)
mainloop = threading.Thread(target=SendAndReceive)
mainloop.daemon=True
mainloop.start()
|
