AVR Freaks

I found the culprit...  I had some function pointers that were making it unhappy:

void SS_PC1_LOW(){PORTC &= ~ (1<<PC1);}
void SS_PC1_HIGH(){PORTC |= (1<<PC1);}

void SS_PC2_LOW(){PORTC &= ~ (1<<PC2);}
void SS_PC2_HIGH(){PORTC |= (1<<PC2);}

void SS_PD4_LOW(){PORTD &= ~ (1<<PD4);}
void SS_PD4_HIGH(){PORTD |= (1<<PD4);}

void SS_PD5_LOW(){PORTD &= ~ (1<<PD5);}
void SS_PD5_HIGH(){PORTD |= (1<<PD5);}

void SS_PD6_LOW(){PORTD &= ~ (1<<PD6);}
void SS_PD6_HIGH(){PORTD |= (1<<PD6);}

void SS_PD7_LOW(){PORTD &= ~ (1<<PD7);}
void SS_PD7_HIGH(){PORTD |= (1<<PD7);}

void SS_PB0_LOW(){PORTB &= ~ (1<<PB0);}
void SS_PB0_HIGH(){PORTB |= (1<<PB0);}

const void (*SS_LOW_FUNC[])() = {SS_PC1_LOW,SS_PC2_LOW,SS_PD4_LOW,SS_PD5_LOW,SS_PD6_LOW,SS_PD7_LOW,SS_PB0_LOW};

const void (*SS_HIGH_FUNC[])() = {SS_PC1_HIGH,SS_PC2_HIGH,SS_PD4_HIGH,SS_PD5_HIGH,SS_PD6_HIGH,SS_PD7_HIGH,SS_PB0_HIGH};

Thanks, David.  

No mystery...   The Teensy is just pitstop on the way to custom 32u4 based board.  I have half a project working in Arduino and half in AS7...  the half in AS7 is a custom LUFA based HID where the interface is legacy and dictated...  so either I can shoehorn the USB layer into the Teensyduino implementation and not have debug when moving to the primary hardware, rewrite the working sketch into AS7 from scratch, or import the working code.  

Rewriting is my first choice, but I borked the SPI layer somewhere, so importing and comparing the SPI implementations seemed simple enough.  I guess I could just clip out the bits I need rather than the full Arduino core...  And certainly I will have a debug header on my PCB eventually.