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"""Test for nrf24l01 module."""
import struct
import pyb
from pyb import Pin, SPI
from nrf24l01 import NRF24L01
pipes = (b'\xf0\xf0\xf0\xf0\xe1', b'\xf0\xf0\xf0\xf0\xd2')
def master():
nrf = NRF24L01(SPI(2), Pin('Y5'), Pin('Y4'), payload_size=8)
nrf.open_tx_pipe(pipes[0])
nrf.open_rx_pipe(1, pipes[1])
nrf.start_listening()
num_needed = 16
num_successes = 0
num_failures = 0
led_state = 0
print('NRF24L01 master mode, sending %d packets...' % num_needed)
while num_successes < num_needed and num_failures < num_needed:
# stop listening and send packet
nrf.stop_listening()
millis = pyb.millis()
led_state = max(1, (led_state << 1) & 0x0f)
print('sending:', millis, led_state)
try:
nrf.send(struct.pack('ii', millis, led_state))
except OSError:
pass
# start listening again
nrf.start_listening()
# wait for response, with 250ms timeout
start_time = pyb.millis()
timeout = False
while not nrf.any() and not timeout:
if pyb.elapsed_millis(start_time) > 250:
timeout = True
if timeout:
print('failed, response timed out')
num_failures += 1
else:
# recv packet
got_millis, = struct.unpack('i', nrf.recv())
# print response and round-trip delay
print('got response:', got_millis, '(delay', pyb.millis() - got_millis, 'ms)')
num_successes += 1
# delay then loop
pyb.delay(250)
print('master finished sending; successes=%d, failures=%d' % (num_successes, num_failures))
def slave():
nrf = NRF24L01(SPI(2), Pin('Y5'), Pin('Y4'), payload_size=8)
nrf.open_tx_pipe(pipes[1])
nrf.open_rx_pipe(1, pipes[0])
nrf.start_listening()
print('NRF24L01 slave mode, waiting for packets... (ctrl-C to stop)')
while True:
pyb.wfi()
if nrf.any():
while nrf.any():
buf = nrf.recv()
millis, led_state = struct.unpack('ii', buf)
print('received:', millis, led_state)
for i in range(4):
if led_state & (1 << i):
pyb.LED(i + 1).on()
else:
pyb.LED(i + 1).off()
pyb.delay(15)
nrf.stop_listening()
try:
nrf.send(struct.pack('i', millis))
except OSError:
pass
print('sent response')
nrf.start_listening()
print('NRF24L01 test module loaded')
print('NRF24L01 pinout for test:')
print(' CE on Y4')
print(' CSN on Y5')
print(' SCK on Y6')
print(' MISO on Y7')
print(' MOSI on Y8')
print('run nrf24l01test.slave() on slave, then nrf24l01test.master() on master')
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