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-rw-r--r--src/stm32f1/usbserial.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/stm32f1/usbserial.c b/src/stm32f1/usbserial.c
index 7eeb3421..3bdf86a8 100644
--- a/src/stm32f1/usbserial.c
+++ b/src/stm32f1/usbserial.c
@@ -6,6 +6,7 @@
#include <string.h> // NULL
#include "autoconf.h" // CONFIG_STM_FLASH_START_2000
+#include "board/armcm_timer.h" // udelay
#include "board/gpio.h" // gpio_out_setup
#include "board/io.h" // writeb
#include "board/irq.h" // irq_disable