+#if HAS_SERIAL_1
+struct ao_stm_usart ao_stm_usart1;
+void stm_usart1_isr(void) { ao_usart_isr(&ao_stm_usart1, USE_SERIAL_STDIN); }
+#endif
+#if HAS_SERIAL_2
+struct ao_stm_usart ao_stm_usart2;
+void stm_usart2_isr(void) { ao_usart_isr(&ao_stm_usart2, 0); }
+#endif
+#if HAS_SERIAL_3
+struct ao_stm_usart ao_stm_usart3;
+void stm_usart3_isr(void) { ao_usart_isr(&ao_stm_usart3, 0); }
+#endif
+