firmware: Move rand16() to utils.{c,h}

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>

firmware/main/led_ctrl.c

@@ -13,6 +13,7 @@
 
 #include "config.h"
 #include "pmu.h"
+#include "utils.h"
 
 
 /*
@@ -73,14 +74,6 @@ static struct {
 
 
 
-static uint32_t rng = 1234;
-static uint16_t rand16()
-{
-	rng = (rng * 22695477) + 1;
-	return rng >> 12;
-}
-
-
 static const uint16_t cie[] = {
 	 1156,  3468,  5703,  7651,  9253, 10628, 11843, 12938,
 	13938, 14863, 15724, 16533, 17295, 18018, 18705, 19362,

firmware/main/utils.c

@@ -44,3 +44,12 @@ hexval(char c)
 	else
 		return 0;
 }
+
+
+uint16_t
+rand16()
+{
+	static uint32_t rng = 1234;
+        rng = (rng * 22695477) + 1;
+        return rng >> 12;
+}

firmware/main/utils.h

@@ -11,3 +11,5 @@
 
 char *hexstr(void *d, int n, bool space);
 uint8_t hexval(char c);
+
+uint16_t rand16();