Resolve #4 by making gpio mem global explicitly extern in header.

tdicola · tdicola · commit 950f841474ac · 2016-06-22T05:08:25.000Z
diff --git a/source/Raspberry_Pi/pi_mmio.h b/source/Raspberry_Pi/pi_mmio.h
@@ -30,7 +30,7 @@
 #define MMIO_ERROR_DEVMEM -1
 #define MMIO_ERROR_MMAP -2
 
-volatile uint32_t* pi_mmio_gpio;
+extern volatile uint32_t* pi_mmio_gpio;
 
 int pi_mmio_init(void);
 
diff --git a/source/Raspberry_Pi_2/pi_2_mmio.h b/source/Raspberry_Pi_2/pi_2_mmio.h
@@ -31,7 +31,7 @@
 #define MMIO_ERROR_MMAP -2
 #define MMIO_ERROR_OFFSET -3
 
-volatile uint32_t* pi_2_mmio_gpio;
+extern volatile uint32_t* pi_2_mmio_gpio;
 
 int pi_2_mmio_init(void);
 
