wait for UART Tx completion before switching baud rate at PTS
diff --git a/firmware/src_simtrace/card_emu.h b/firmware/src_simtrace/card_emu.h
index 2b2d3f1..df23ce4 100644
--- a/firmware/src_simtrace/card_emu.h
+++ b/firmware/src_simtrace/card_emu.h
@@ -35,3 +35,4 @@
int card_emu_uart_update_fidi(uint8_t uart_chan, unsigned int fidi);
int card_emu_uart_tx(uint8_t uart_chan, uint8_t byte);
void card_emu_uart_enable(uint8_t uart_chan, uint8_t rxtx);
+void card_emu_uart_wait_tx_idle(uint8_t uart_chan);