Very simple graph.

src/graph.c

@@ -9,6 +9,7 @@
 #define COLOUR_BG   HTML2COLOR(0x202020)
 #define COLOUR_1    GFX_BLUE
 #define COLOUR_2    GFX_RED
+#define COLOUR_3    GFX_FUCHSIA
 
 #define MIN_U       0
 #define MIN_I       0
@@ -37,7 +38,9 @@ void graph_Draw(uint32_t u_value, uint32_t i_value) {
     gdispDrawLine(pos_X, WINDOW_H, pos_X, WINDOW_Y, COLOUR_BG);
 
     // draw new values
-    if (u < i) {
+    if (u == i) {
+        gdispDrawLine(pos_X, WINDOW_H-1, pos_X, i, COLOUR_3);
+    } else if (u < i) {
         gdispDrawLine(pos_X, WINDOW_H-1, pos_X, i, COLOUR_2);
         gdispDrawLine(pos_X, i+1, pos_X, u, COLOUR_1);
     } else {