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-rw-r--r--libmaple/stm32.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/libmaple/stm32.h b/libmaple/stm32.h
index 21c18df..985b941 100644
--- a/libmaple/stm32.h
+++ b/libmaple/stm32.h
@@ -5,8 +5,12 @@
#ifndef _STM32_H_
#define _STM32_H_
+#ifndef PCLK1
#define PCLK1 36000000U
+#endif
+#ifndef PCLK2
#define PCLK2 72000000U
+#endif
#ifdef STM32_MEDIUM_DENSITY
#define NR_INTERRUPTS 43