From 2ac4843a974822a0b547b52a274d13ac39374b9e Mon Sep 17 00:00:00 2001
From: Erich Eckner <git@eckner.net>
Date: Thu, 4 Mar 2021 14:20:29 +0100
Subject: multiplexer.[ch]: make global variables "extern" to the .h and repeat
 in the .c

---
 multiplexer.c | 4 ++++
 multiplexer.h | 6 +++---
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/multiplexer.c b/multiplexer.c
index d0ae7c7..c893ca3 100644
--- a/multiplexer.c
+++ b/multiplexer.c
@@ -11,6 +11,10 @@
 
 #include "multiplexer.h"
 
+int  mem_fd;
+void *gpio_map;
+volatile unsigned *gpio;
+
 //
 // Set up a memory regions to access GPIO
 //
diff --git a/multiplexer.h b/multiplexer.h
index 3fb1f87..00c1113 100644
--- a/multiplexer.h
+++ b/multiplexer.h
@@ -52,8 +52,8 @@ static uint8_t gpioToPUDCLK [] =
 static int tpic_settle_time_iterator = 1000;
 #define wait_tpic_settle_time  for (int i=0; i<tpic_settle_time_iterator; i++) { asm volatile("" : : "r" (i)); }
 
-int  mem_fd;
-void *gpio_map;
+extern int  mem_fd;
+extern void *gpio_map;
 
 typedef struct {
   char buf[3][40];
@@ -75,7 +75,7 @@ typedef struct {
 } t_scroll_data;
 
 // I/O access
-volatile unsigned *gpio;
+extern volatile unsigned *gpio;
 
 // GPIO setup macros. Always use INP_GPIO(x) before using OUT_GPIO(x) or SET_GPIO_ALT(x,y)
 #define INP_GPIO(g) *(gpio+((g)/10)) &= ~(7<<(((g)%10)*3))
-- 
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