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-rw-r--r--libmaple/include/libmaple/spi.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/libmaple/include/libmaple/spi.h b/libmaple/include/libmaple/spi.h
index 90e2036..45dc5a2 100644
--- a/libmaple/include/libmaple/spi.h
+++ b/libmaple/include/libmaple/spi.h
@@ -307,7 +307,7 @@ uint32 spi_tx(spi_dev *dev, const void *buf, uint32 len);
* @brief Call a function on each SPI port
* @param fn Function to call.
*/
-void spi_foreach(void (*fn)(spi_dev*));
+extern void spi_foreach(void (*fn)(spi_dev*));
void spi_peripheral_enable(spi_dev *dev);
void spi_peripheral_disable(spi_dev *dev);