Unable to configure Pi

[napikwaan]

Hey Nate. I've been trying to get up and running with this, but after running radio.printDetails() it seems like I'm not able to configure things correctly. Running node v0.12.0, CSE pin = 22, IRQ pin = 7. spidev0.0 and spidev0.1 have been enabled. The code I'm running is a modification of the example in the README:

var spiDev = '/dev/spidev0.0',
    cePin  = 22,
    irqPin = 7,
//    pipes  = [0xF0F0F0F0E1, 0xF0F0F0F0D2];
    pipes  = [Buffer('F0F0F0F0E1', 'hex'), Buffer('F0F0F0F0D2', 'hex')];

var radio = require('nrf').connect(spiDev, cePin, irqPin);
radio.channel(0x4c).dataRate('1Mbps').crcBytes(2).autoRetransmit({ count: 15, delay: 4000 });

radio.begin(function() {
  var rx = radio.openPipe('rx', pipes[0]),
      tx = radio.openPipe('tx', pipes[0]);

  radio.printDetails();

  rx.on('data', function(d) {
    console.log(d);
  });

  tx.write('Testing');
});

radio.printDetails() gives me a ton of 0's:

Key	Value
SPI device:	/dev/spidev0.0
CE GPIO:	22
IRQ GPIO:	7
STATUS:	0x0 RX_DR=0 TX_DS=0 MAX_RT=0 RX_P_NO=0 TX_FULL=0
RX_ADDR_P0–1:	0x0000000000 0x0000000000
RX_ADDR_P2–5:	0x00 0x00 0x00 0x00
TX_ADDR:	0x0000000000
RX_PW_P0–5:	0x0 0x0 0x0 0x0 0x0 0x0
EN_AA:	0x00
EN_RXADDR:	0x00
RF_CH:	0x0
RF_SETUP:	0x00
CONFIG:	0x00
DYNPD/FEATURE:	0x00 0x00
Data Rate:	1Mbps
Model:	nRF24L01
CRC Length:	Disabled
PA Power:	PA_MIN

Additionally, the following message is logged to the console:

Unexpected IRQ during transmit phase!

[natevw]

First thing that comes to mind is, have you made sure the pins you are using the correct ones? The logical pin numbering of the Raspberry Pi is different than the physical order of pins. For example, logical GPIO 22 is what would be traditionally called pin 15 of the header itself.

[napikwaan]

Thanks for the reply. When referencing pin numbers in my previous comment I was referring to the GPIO pins. My pins are wired like this:

nRF24L01	Pi
VCC	3.3v (17)
GND	GND (9)
CSN	GPIO 8 (24)
CE	GPIO 22 (15)
MOSI	GPIO 10 (19)
SCK	GPIO 11 (23)
MISO	GPIO 9 (21)
IRQ	GPIO 7 (26)

Incidentally, I have been been able to successfully test the nRF24L01 using the instructions on HomeAutomationForGeeks so I know the unit is functional. I'm sure there's something basic I'm missing here, I just haven't been able to figure it out yet.

[natevw]

Ah! You might be running into an issue where the C++ RF24 library disables the kernel SPI driver's select line. Could you follow the instructions at https://github.com/natevw/node-nrf#node-nrf-or-pi-spi-not-working-after-using-c-rf24-library and see if that helps?

[napikwaan]

That did the trick. When running sudo modprobe spi_bcm2708 I got an error, but rebooting the Pi got it working. Thanks a ton for your help, natevw.