[Python] RFM69 stuck on 1024

I have an RFM69HCW connected to a raspberry pi pico like this:



running this script, I always seem to get back the wrong values.It always returns the maximum it can give.

""" Receiver """

from machine import SPI, Pin
from rfm69 import RFM69
import time

FREQ = 432.5
ENCRYPTION_KEY = b"\x01\x02\x03\x04\x05\x06\x07\x08\x01\x02\x03\x04\x05\x06\x07\x08"
NODE_ID = 100 # ID of this node (BaseStation)

spi = SPI(0, sck=Pin(6), mosi=Pin(7), miso=Pin(4), baudrate=50000, polarity=0, phase=0, firstbit=SPI.MSB)
nss = Pin( 5, Pin.OUT, value=True )
rst = Pin( 3, Pin.OUT, value=False )

led = Pin( 25, Pin.OUT )

rfm = RFM69( spi=spi, nss=nss, reset=rst )
rfm.frequency_mhz = FREQ
rfm.encryption_key = ( ENCRYPTION_KEY )
rfm.node = NODE_ID

print( 'Freq :', rfm.frequency_mhz )
print( 'NODE :', rfm.node )

print("Waiting for packets...")
while True:
packet = rfm.receive( timeout = 0.5 ) # Without ACK
if packet is None: # No packet received
print( "." )
pass
else: # Received a packet!
led.on()
# And decode from ASCII text (to local utf-8)
print(packet)
message = str(packet, "ascii") # this is our message
rssi = str(rfm.last_rssi) # signal strength
print(message + ", " + rssi) # print message with signal strength
led.off()




This is the output if I run the program:

MPY: soft reboot
Freq : 1024.0
NODE : 100
Waiting for packets...
bytearray(b'\xff\xff\xff...')
Traceback (most recent call last):
File "<stdin>", line 35, in <module>
UnicodeError:


I have tested the connection using this script:

""" Basic test of RFM69HCW SPI module

RFM69HCW breakout : https://shop.mchobby.be/product.php?id_product=1390
RFM69HCW breakout : https://www.adafruit.com/product/3071

https://github.com/mchobby/esp8266-upy/tree/master/rfm69
"""

from machine import SPI, Pin
from rfm69 import RFM69

def dbm_to_mw(dBm):
""" Transform the power in dBm to its equivalent in milliWatt """
return 10**((dBm)/10.)

spi = SPI(0, baudrate=50000, polarity=0, phase=0, firstbit=SPI.MSB)
nss = Pin( 5, Pin.OUT, value=True )
rst = Pin( 3, Pin.OUT, value=False )

rfm = RFM69( spi=spi, nss=nss, reset=rst )
rfm.frequency_mhz = 433.1
rfm.bitrate = 250000 # 250 Kbs
rfm.frequency_deviation = 250000 # 250 KHz
rfm.tx_power = 13 # 13 dBm = 20mW (default value, safer for all modules)
#rfm.tx_power = 20 # 20 dBm = 100mW, 20 dBm for FRM69HW
rfm.encryption_key = ( b"\x01\x02\x03\x04\x05\x06\x07\x08\x01\x02\x03\x04\x05\x06\x07\x08" )

print( 'RFM version :', rfm.version )
print( 'Freq :', rfm.frequency_mhz )
print( 'Freq. deviation :', rfm.frequency_deviation, 'Hz' )
print( 'bitrate :', rfm.bitrate, 'bits/sec' )
print( 'tx power :', rfm.tx_power, 'dBm' )
print( 'tx power :', dbm_to_mw(rfm.tx_power), 'mW' )
print( 'Temperature :', rfm.temperature, 'Celsius' )
print( 'Sync on :', 'yes' if rfm.sync_on else 'no' )
print( 'Sync size :', rfm.sync_size )
print( 'Sync Word Length:', rfm.sync_size+1, "(Sync size+1)" )
print( 'Sync Word :', rfm.sync_word )
print( 'CRC on :', rfm.crc_on )

print( 'Preamble Lenght :', rfm.preamble_length )
print( 'aes on :', rfm.aes_on )
print( 'Encryption Key :', rfm.encryption_key )


which gives this result:



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