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-rw-r--r--src-avr/ao_timer.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/src-avr/ao_timer.c b/src-avr/ao_timer.c
index 9142a497..cc48dd2a 100644
--- a/src-avr/ao_timer.c
+++ b/src-avr/ao_timer.c
@@ -41,6 +41,9 @@ volatile __data uint8_t ao_adc_interval = 1;
volatile __data uint8_t ao_adc_count;
#endif
+void
+ao_debug_out(char c);
+
#ifdef AVR
ISR(TIMER1_COMPA_vect)
#else