circuitpython/drivers/nrf24l01/nrf24l01test.py

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"""Test for nrf24l01 module. Portable between MicroPython targets."""
import sys
import ustruct as struct
import utime
from machine import Pin, SPI
from nrf24l01 import NRF24L01
from micropython import const
# Slave pause between receiving data and checking for further packets.
_RX_POLL_DELAY = const(15)
# Slave pauses an additional _SLAVE_SEND_DELAY ms after receiving data and before
# transmitting to allow the (remote) master time to get into receive mode. The
# master may be a slow device. Value tested with Pyboard, ESP32 and ESP8266.
_SLAVE_SEND_DELAY = const(10)
if sys.platform == 'pyboard':
cfg = {'spi': 2, 'miso': 'Y7', 'mosi': 'Y8', 'sck': 'Y6', 'csn': 'Y5', 'ce': 'Y4'}
elif sys.platform == 'esp8266': # Hardware SPI
cfg = {'spi': 1, 'miso': 12, 'mosi': 13, 'sck': 14, 'csn': 4, 'ce': 5}
elif sys.platform == 'esp32': # Software SPI
cfg = {'spi': -1, 'miso': 32, 'mosi': 33, 'sck': 25, 'csn': 26, 'ce': 27}
else:
raise ValueError('Unsupported platform {}'.format(sys.platform))
pipes = (b'\xf0\xf0\xf0\xf0\xe1', b'\xf0\xf0\xf0\xf0\xd2')
def master():
csn = Pin(cfg['csn'], mode=Pin.OUT, value=1)
ce = Pin(cfg['ce'], mode=Pin.OUT, value=0)
if cfg['spi'] == -1:
spi = SPI(-1, sck=Pin(cfg['sck']), mosi=Pin(cfg['mosi']), miso=Pin(cfg['miso']))
nrf = NRF24L01(spi, csn, ce, payload_size=8)
else:
nrf = NRF24L01(SPI(cfg['spi']), csn, ce, 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 = utime.ticks_ms()
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 = utime.ticks_ms()
timeout = False
while not nrf.any() and not timeout:
if utime.ticks_diff(utime.ticks_ms(), 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', utime.ticks_diff(utime.ticks_ms(), got_millis), 'ms)')
num_successes += 1
# delay then loop
utime.sleep_ms(250)
print('master finished sending; successes=%d, failures=%d' % (num_successes, num_failures))
def slave():
csn = Pin(cfg['csn'], mode=Pin.OUT, value=1)
ce = Pin(cfg['ce'], mode=Pin.OUT, value=0)
if cfg['spi'] == -1:
spi = SPI(-1, sck=Pin(cfg['sck']), mosi=Pin(cfg['mosi']), miso=Pin(cfg['miso']))
nrf = NRF24L01(spi, csn, ce, payload_size=8)
else:
nrf = NRF24L01(SPI(cfg['spi']), csn, ce, 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:
if nrf.any():
while nrf.any():
buf = nrf.recv()
millis, led_state = struct.unpack('ii', buf)
print('received:', millis, led_state)
for led in leds:
if led_state & 1:
led.on()
else:
led.off()
led_state >>= 1
utime.sleep_ms(_RX_POLL_DELAY)
# Give master time to get into receive mode.
utime.sleep_ms(_SLAVE_SEND_DELAY)
nrf.stop_listening()
try:
nrf.send(struct.pack('i', millis))
except OSError:
pass
print('sent response')
nrf.start_listening()
try:
import pyb
leds = [pyb.LED(i + 1) for i in range(4)]
except:
leds = []
print('NRF24L01 test module loaded')
print('NRF24L01 pinout for test:')
print(' CE on', cfg['ce'])
print(' CSN on', cfg['csn'])
print(' SCK on', cfg['sck'])
print(' MISO on', cfg['miso'])
print(' MOSI on', cfg['mosi'])
print('run nrf24l01test.slave() on slave, then nrf24l01test.master() on master')