Reorg, added more sources

Applications/Official/DEV_FW/source/grnch/lightmeter/lightmeter_helper.c

@@ -0,0 +1,43 @@
+#include "lightmeter_helper.h"
+#include "lightmeter_config.h"
+
+extern const float aperture_numbers[];
+extern const float speed_numbers[];
+
+float lux2ev(float lux) {
+    return log2(lux / 2.5);
+}
+
+float getMinDistance(float x, float v1, float v2) {
+    if(x - v1 > v2 - x) {
+        return v2;
+    }
+
+    return v1;
+}
+
+float normalizeAperture(float a) {
+    for(int i = 0; i < AP_NUM; i++) {
+        float a1 = aperture_numbers[i];
+        float a2 = aperture_numbers[i + 1];
+
+        if(a1 < a && a2 >= a) {
+            return getMinDistance(a, a1, a2);
+        }
+    }
+
+    return 0;
+}
+
+float normalizeTime(float a) {
+    for(int i = 0; i < SPEED_NUM; i++) {
+        float a1 = speed_numbers[i];
+        float a2 = speed_numbers[i + 1];
+
+        if(a1 < a && a2 >= a) {
+            return getMinDistance(a, a1, a2);
+        }
+    }
+
+    return 0;
+}