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-rw-r--r--src/core/ao.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/core/ao.h b/src/core/ao.h
index 494993f1..8c5335c4 100644
--- a/src/core/ao.h
+++ b/src/core/ao.h
@@ -943,6 +943,10 @@ ao_serial_init(void);
#endif
#if HAS_SERIAL_0
+
+extern volatile __xdata struct ao_fifo ao_usart0_rx_fifo;
+extern volatile __xdata struct ao_fifo ao_usart0_tx_fifo;
+
void
ao_serial0_rx0_isr(void) ao_arch_interrupt(2);