add ohm char font, change face of zero "0"

Font5x7.c

@@ -586,19 +586,19 @@ const uint16_t x5x7_bits [] =
      bbw=5, bbh=7, bbx=0, bby=-1, width=5
      +----------------+
      |                |
-     |  **            |
+     | ***            |
-     | *              |
+     |*   *           |
-     |***             |
+     |*   *           |
-     | *              |
+     | * *            |
-     |* **            |
+     |** **           |
      |                |
      +----------------+ */
   0x0000,
-  0x3000,
+  0x7000,
-  0x4000,
+  0x8800,
-  0xe000,
+  0x8800,
-  0x4000,
+  0x5000,
-  0xb000,
+  0xb800,
   0x0000,
 
   /* Character (0x1f):
@@ -927,20 +927,20 @@ const uint16_t x5x7_bits [] =
   /* Character (0x30):
      bbw=5, bbh=7, bbx=0, bby=-1, width=5
      +----------------+
-     | *              |
+     | **             |
-     |* *             |
+     |*  *            |
-     |* *             |
+     |*  *            |
-     |* *             |
+     |*  *            |
-     |* *             |
+     |*  *            |
-     | *              |
+     | **             |
      |                |
      +----------------+ */
-  0x4000,
+  0x6000,
-  0xa000,
+  0x9000,
-  0xa000,
+  0x9000,
-  0xa000,
+  0x9000,
-  0xa000,
+  0x9000,
-  0x4000,
+  0x6000,
   0x0000,
 
   /* Character (0x31):

ili9431.c

@@ -175,6 +175,12 @@ const uint8_t ili9341_init_seq[] = {
 		0xB7, 1, 0x06,
 		// display function control
 		0xB6, 4, 0x0A, 0x82, 0x27, 0x00,
+
+		// control display
+		//0x53, 1, 0x0c,
+		// diaplay brightness
+		//0x51, 1, 0xff,
+
 		// sleep out
 		0x11, 0,
 		0 // sentinel

main.c

@@ -852,11 +852,20 @@ static void cmd_marker(BaseSequentialStream *chp, int argc, char *argv[])
     }
     return;
   } 
+  if (strcmp(argv[0], "off") == 0) {
+    active_marker = -1;
+    for (t = 0; t < 4; t++)
+      markers[t].enabled = FALSE;
+    return;
+  }
+
   t = atoi(argv[0])-1;
   if (t < 0 || t >= 4)
     goto usage;
   if (argc == 1) {
     chprintf(chp, "%d %d\r\n", t+1, markers[t].index);
+    active_marker = t;
+    markers[t].enabled = TRUE;
     return;
   }
   if (argc > 1) {

nanovna.h

@@ -122,6 +122,8 @@ void draw_cell_all(void);
 extern const uint16_t x5x7_bits [];
 extern const uint32_t numfont20x24[][24];
 
+#define CHAR_OHM  '\0x1e'
+
 int caldata_save(void);
 int caldata_recall(void);