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#This tests that the duty cycle of PWM is (approximately) correct.
from microbit import *
def pins_connected(p0, p1):
for i in 0,1,0,1,0,1,0,1:
p0.write_digital(i)
if p1.read_digital() != i:
return False
p1.write_digital(i)
if p0.read_digital() != i:
return False
return True
def test_pwm(p0, p1):
#Flip between modes many times
for i in range(100):
pin0.write_digital(i & 1)
pin0.write_analog(i*10)
#Now make sure it is still working.
p0.write_digital(0)
for val in 100, 200, 300, 500, 800, 900:
print("Testing duty cycle", val)
p0.write_analog(val)
sleep(20)
count = 0
for i in range(10*1024):
count += p1.read_digital()
print("%+0.2f%%" % ((count-val*10)/val*10))
# Allow +- 5%
assert abs(count - val*10) < val//2
try:
if pins_connected(pin0, pin1):
test_pwm(pin0, pin1)
print("PWM test: PASS")
display.show(Image.HAPPY)
else:
print("Connect pin0 to pin1")
display.show("?")
except Exception as ae:
display.show(Image.SAD)
raise
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