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-rw-r--r--src/stm32f1/internal.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/stm32f1/internal.h b/src/stm32f1/internal.h
index be9ea4d0..73aa179b 100644
--- a/src/stm32f1/internal.h
+++ b/src/stm32f1/internal.h
@@ -8,4 +8,6 @@
extern GPIO_TypeDef *const digital_regs[];
extern uint32_t const digital_pins[];
+void udelay(uint32_t usecs);
+
#endif // internal.h