circuitpython/drivers/nrf24l01/nrf24l01test.py

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"""Test for nrf24l01 module. Portable between MicroPython targets."""
import usys
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 usys.platform == "pyboard":
cfg = {"spi": 2, "miso": "Y7", "mosi": "Y8", "sck": "Y6", "csn": "Y5", "ce": "Y4"}
elif usys.platform == "esp8266": # Hardware SPI
cfg = {"spi": 1, "miso": 12, "mosi": 13, "sck": 14, "csn": 4, "ce": 5}
elif usys.platform == "esp32": # Software SPI
cfg = {"spi": -1, "miso": 32, "mosi": 33, "sck": 25, "csn": 26, "ce": 27}
else:
raise ValueError("Unsupported platform {}".format(usys.platform))
# Addresses are in little-endian format. They correspond to big-endian
# 0xf0f0f0f0e1, 0xf0f0f0f0d2
pipes = (b"\xe1\xf0\xf0\xf0\xf0", b"\xd2\xf0\xf0\xf0\xf0")
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")