Recommended GNU Tool Chain Versions

Firmware v0.5.5-p3 compiles in AVR-GCC 4.8.1 (AVR 8-Bit GNU Toolchain
3.4.5_1822) with the following modifications:

Replace "SIG_OVERFLOW0" with "TIMER0_OVF_vect"
Replace "SIG_ADC" with "ADC_vect"
Replace "SIG_UART_DATA" with "USART_UDRE_vect"

Add the deprecated macros for outp, outb, BV, inp, cbi, and sbi posted by
Joerg in the "Firmware compile problem solved" thread.

The only other modification needed to pass the tone test was to set the low
fuse for a high frequency external crystal:
>> sudo avrdude -p m8 -c sp12 -U lfuse:w:0xEF:m

That's it.

Note: Do not replace "SIGNAL()" with "ISR()", even though it is suggested
in the compiler docs, as this requires additional changes not accounted
for.

Martín A Molina

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