no connection from pi pico to arduino

[skeyvin]

i have this on the pico

print("Hello World!")
import time
import struct
import board
import busio
import digitalio
from digitalio import *
from circuitpython_nrf24l01.rf24 import RF24
spi = busio.SPI(clock=board.GP2, MOSI=board.GP3, MISO=board.GP4)
    # change these (digital output) pins accordingly
CE_PIN = DigitalInOut(board.GP1)
CSN_PIN = DigitalInOut(board.GP0)
nrf = RF24(spi, CSN_PIN, CE_PIN)
nrf.pa_level = -12
address = [b"\xe1\xf0\xf0\xf0\xf0", b"2Node"]
nrf.open_tx_pipe(address[0])  # always uses pipe 0
nrf.open_rx_pipe(1, address[1])
nrf.data_rate = 250
nrf.channel = 100
nrf.listen = False
while True:
    nrf.send(b"u")

and i have checked the wiring. and i have this

#include <SPI.h>
#include <nRF24L01.h>
#include <RF24.h>
RF24 radio(7,8);
const byte address[5] = "00001";
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
if(!radio.begin()){
  Serial.print("biggus dookes");
}
Serial.println("ready");
radio.setChannel(100);
  radio.openReadingPipe(1, 0xE1F0F0F0F0);
  radio.openWritingPipe(0xE2F0F0F0F0);
  radio.setPALevel(RF24_PA_MIN);
  radio.startListening();
  radio.setDataRate(RF24_250KBPS);
 // radio.setAutoAck(true);
 // radio.powerUp();
}

void loop() {
  if (radio.available()){
    char text[32] = "";
    radio.read(&text, sizeof(text));
    Serial.print(text);
    Serial.print("\n");

  }
}

on the arduino. they work fine if i use the c++ version for the pi pico but when i use the circuitpython version i cant get any data to the arduino.

[2bndy5]

set

nrf.dynamic_payloads = False

There are a few differences between the C++ and CirPy libs outlined at the bottom of the examples' doc.

[skeyvin]

set

nrf.dynamic_payloads = False

There are a few differences between the C++ and CirPy libs outlined at the bottom of the examples' doc.

set it to

import time
import struct
import board
import busio
import digitalio
from digitalio import *
from circuitpython_nrf24l01.rf24 import RF24
spi = busio.SPI(clock=board.GP2, MOSI=board.GP3, MISO=board.GP4)
    # change these (digital output) pins accordingly
CE_PIN = DigitalInOut(board.GP1)
CSN_PIN = DigitalInOut(board.GP0)
nrf = RF24(spi, CSN_PIN, CE_PIN)
nrf.pa_level = -12
address = [b"\xe1\xf0\xf0\xf0\xf0", b"2Node"]
nrf.open_tx_pipe(address[0])  # always uses pipe 0
nrf.open_rx_pipe(1, address[1])
nrf.data_rate = 250
nrf.channel = 100
nrf.allow_ask_no_ack = False
nrf.dynamic_payloads = False
nrf.listen = False
while True:
    nrf.payload_length = 8
    nrf.send(b"u")

but still no success

[2bndy5]

   nrf.payload_length = 8

This needs to match whatever you passed to radio.setPayloadSize() on the Arduino side. Based on the code you posted in the OP, you didn't actually call this on the Arduino, so it should be only looking to receive 32-byte payloads.

[skeyvin]

This needs to match whatever you passed to radio.setPayloadSize() on the Arduino side. Based on the code you posted in the OP, you didn't actually call this on the Arduino, so it should be only looking to receive 32-byte payloads.

changed it to

from circuitpython_nrf24l01.rf24 import RF24
spi = busio.SPI(clock=board.GP2, MOSI=board.GP3, MISO=board.GP4)
    # change these (digital output) pins accordingly
CE_PIN = DigitalInOut(board.GP1)
CSN_PIN = DigitalInOut(board.GP0)
nrf = RF24(spi, CSN_PIN, CE_PIN)
nrf.pa_level = -12
address = [b"\xe1\xf0\xf0\xf0\xf0", b"2Node"]
nrf.open_tx_pipe(address[0])  # always uses pipe 0
nrf.open_rx_pipe(1, address[1])
nrf.data_rate = 250
nrf.channel = 100
nrf.allow_ask_no_ack = False
nrf.dynamic_payloads = False
nrf.listen = False
nrf.payload_length = 32
while True:

    nrf.send(b"u")

and changed the arduino code to

#include <SPI.h>
#include <nRF24L01.h>
#include <RF24.h>
RF24 radio(7,8);
const byte address[5] = "00001";
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
if(!radio.begin()){
  Serial.print("biggus dookes");
}
Serial.println("ready");
radio.setChannel(100);
  radio.openReadingPipe(1, 0xE1F0F0F0F0);
  radio.openWritingPipe(0xE2F0F0F0F0);
  radio.setPALevel(RF24_PA_MIN);
  radio.startListening();
  radio.setDataRate(RF24_250KBPS);
  radio.setPayloadSize(32);
 // radio.setAutoAck(true);
 // radio.powerUp();
}

void loop() {
  if (radio.available()){
    char text[32] = "";
    radio.read(&text, sizeof(text));
    Serial.print(text);
    Serial.print("se\n");

  }

}

[2bndy5]

well, if that didn't work, then the addresses assigned to the pipe might be using conflicting endianness.

In python:

address = b"\xe1\xf0\xf0\xf0\xf0"  # written in little endian

In C++:

uint8_t address[] = {0xe1, 0xf0, 0xf0, 0xf0, 0xf0}; // little endian (I think)
uint64_t addr = 0xe1f0f0f0f0; // big endian (I think)

[2bndy5]

@skeyvin It is more memory efficient in C++ to use an array of bytes (like a c-string but without the NULL terminating byte). The ability to use a uint64_t address in C++ RF24 is officially deprecated, and it uses 8 bytes of memory to store a 5 byte address.

[skeyvin]

Thanks for that kind stranger on the internet. uint8_t in combination with disabling dynamic payload worked