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-rw-r--r--include/libopencm3/stm32/f1/memorymap.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/libopencm3/stm32/f1/memorymap.h b/include/libopencm3/stm32/f1/memorymap.h
index d2c3651..f8528d4 100644
--- a/include/libopencm3/stm32/f1/memorymap.h
+++ b/include/libopencm3/stm32/f1/memorymap.h
@@ -25,7 +25,7 @@
/* --- STM32 specific peripheral definitions ------------------------------- */
/* Memory map for all busses */
-#define PERIPH_BASE 0x40000000
+#define PERIPH_BASE ((u32)0x40000000)
#define PERIPH_BASE_APB1 (PERIPH_BASE + 0x00000)
#define PERIPH_BASE_APB2 (PERIPH_BASE + 0x10000)
#define PERIPH_BASE_AHB (PERIPH_BASE + 0x18000)