Arduino Forum

Products => Arduino Due => Topic started by: mattmoss on Mar 20, 2013, 09:05 pm

Title: Making WiFly (RN-131C) work with Arduino Due (R3)
Post by: mattmoss on Mar 20, 2013, 09:05 pm
I have a Sparkfun WiFly Shield (RN-131C, 6/15/10 rev). When I plug it into an Arduino Uno (SMD ed.) and use the WiFly-Shield library, it works: no problems. Plugging it into an Arduino Due (R3) does not.

I'm still a relative newb when it comes to Arduino. However, my best guess is that communications over SPI is not working.

I see that the Due moved SPI pins to the center of the board on a 2x3 header. So I tried not plugging the WiFly shield directly into the Due, but jumping wires from the WiFly shield headers to the Due headers as seemed appropriate. That is:

WiFly VIN -> Due VIN
WiFly GND -> Due GND
WiFly  D7 -> Due  D7    (/IRQ)
WiFly D10 -> Due D10    (/CS)
WiFly D11 -> Due D75    (MOSI)
WiFly D12 -> Due D74    (MISO)
WiFly D13 -> Due D76    (SCK)

When I run SpiUartTerminal example, it fails in SpiUartDevice::uartConnected, where the readRegister(SPR) call returns 0xFF rather than the test character. Ideas?

Am I misunderstanding how things work here? As far as I can tell (looking at ( and (, the 10-13 pins on the WiFly shield are wired to the CS/MOSI/MISO/SCK of the WiFly's SPI interface, and that's my only option (no UART exposed). Shouldn't jumpering those to the moved pins of the Due work?
Title: Re: Making WiFly (RN-131C) work with Arduino Due (R3)
Post by: mattmoss on Mar 21, 2013, 02:06 am
In case anyone else needs this information…

I managed to get things working. Wired things as in my above post. Loaded up the SpiUartTerminal example sketch from the WiFly-Shield library (which, btw, also needs to have F(x) #defined as no-op). Added one line to the top:

pinMode(10, OUTPUT);

After that, was able to connect to cmd mode, send commands, join a network, and telnet in.

I assumed that the SpiUartTerminal sketch was sufficient in itself (and perhaps it is for the Uno or other boards), but I had to explicitly set the CS pin for OUTPUT to get things working. Always the simple things...
Title: Re: Making WiFly (RN-131C) work with Arduino Due (R3)
Post by: gallegojm on May 18, 2013, 05:51 pm
May be my work can help you: (