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# Test executing Python code while IRQs disabled.
try:
from machine import disable_irq, enable_irq
from time import ticks_us
except ImportError:
print("SKIP")
raise SystemExit
# Structured to also nest disable_irq() calls
def f(n):
st_irq = disable_irq()
if n:
f(n - 1)
else:
# busy-wait in a tight loop for 1ms, to simulate doing some work in a critical section
# (can't wait for time_us() to increment as not all ports will "tick" with interrupts off.)
for _ in range(100):
ticks_us()
enable_irq(st_irq)
for nest in range(3):
print(nest)
for _ in range(5):
f(nest)
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