I posted this on the main Arduino forum, but no one has responded in 24 hours.

I'm trying to use the WaveHC library from Adafruit with a custom PCB. I am having trouble getting the SPI com to work for some reason, I modified the ArduinoPins.h, SS_PIN, from pin 10 to 8.

Using the Arduino SD library, I can see all the files no problem.

In the WaveHC library, all of the examples freeze after card.init(), I traced it to the spiSend(uint8_t b) in SdReader.cpp. It seems to get stuck in while(!(SPSR & (1 << SPIF)). This looks like the SPDR register (the SPI data register) is never loaded properly.

Does anyone know what is going on?

Adafruit library : https://github.com/adafruit/WaveHC

Edit : This is the output from the SDReadTest example (Arduino SD Library)

Initializing SD card...Wiring is correct and a card is present.

Card type: SD2

Volume type is FAT32

Volume size (bytes): 1973350400
Volume size (Kbytes): 1927100
Volume size (Mbytes): 1881

Files found on the card (name, date and size in bytes): 
SYSTEM~1/     2016-11-07 14:11:06
  INDEXE~1      2016-11-07 14:11:06 76
0.WAV         2016-11-07 11:44:14 22124
1.WAV         2016-11-07 11:44:14 18604
2.WAV         2016-11-07 11:44:14 19244
3.WAV         2016-11-07 11:44:14 19884
4.WAV         2016-11-07 11:44:14 21164
5.WAV         2016-11-07 11:44:14 23084
6.WAV         2016-11-07 11:44:14 21484
7.WAV         2016-11-07 11:44:14 29484
8.WAV         2016-11-07 11:44:14 20844
9.WAV         2016-11-07 11:44:14 25004
P.WAV         2016-11-07 11:44:14 21804

Notes :

• I am using an Atmega328P @ 8MHz with the pro mini bootloader (this may be the issue)
• SPI_DEFAULT_HALF_SPEED is set to true
• SPI_INIT_SLOW is set to 1