Fix indents and switch syntax

Fix indentions in `spi_byte()` and add missing space after `switch`
keywords.

firmware/src/main.c

@@ -165,6 +165,62 @@ static void lcd_write_symbol_page(const struct symbol* sym,
             lcd_write(sym->symbol[page * sym->length + i]);
 }
 
+static void lcd_write_digit_page(uint8_t digit, uint8_t page,
+                                 bool invert) {
+    switch (digit) {
+    case 0:
+        lcd_write_symbol_page(&sym_0, page, invert);
+        break;
+    case 1:
+        lcd_write_symbol_page(&sym_1, page, invert);
+        break;
+    case 2:
+        lcd_write_symbol_page(&sym_2, page, invert);
+        break;
+    case 3:
+        lcd_write_symbol_page(&sym_3, page, invert);
+        break;
+    case 4:
+        lcd_write_symbol_page(&sym_4, page, invert);
+        break;
+    case 5:
+        lcd_write_symbol_page(&sym_5, page, invert);
+        break;
+    case 6:
+        lcd_write_symbol_page(&sym_6, page, invert);
+        break;
+    case 7:
+        lcd_write_symbol_page(&sym_7, page, invert);
+        break;
+    case 8:
+        lcd_write_symbol_page(&sym_8, page, invert);
+        break;
+    case 9:
+        lcd_write_symbol_page(&sym_9, page, invert);
+        break;
+    }
+}
+
+static void lcd_write_integer_page(uint8_t integer, uint8_t digits,
+                                   uint8_t page, bool invert) {
+    if (digits != 0 || integer != 0) {
+        uint8_t input_digits = 0;
+        uint16_t comperator = 1;
+
+        for (; comperator <= integer; comperator *= 10, input_digits++);
+        for (int8_t i = digits - input_digits; i > 0; i--) {
+            lcd_write_kerning(2, invert);
+            lcd_write_digit_page(0, page, invert);
+        }
+
+        for (; comperator >= 10; comperator /= 10) {
+            lcd_write_kerning(2, invert);
+            lcd_write_digit_page((integer % comperator) / (comperator / 10),
+                                 page, invert);
+        }
+    }
+}
+
 void lcd_splash(void) {
     lcd_fill(0x00);
 
@@ -317,7 +373,8 @@ static void lcd_setup(void) {
         lcd_write_symbol_page(&sym_t, i, false);
         lcd_write_kerning(2, false);
         lcd_write_symbol_page(&sym_colon, i, false);
-        lcd_write_kerning(13, false);
+        lcd_write_kerning(11, false);
+        lcd_write_integer_page(123, 1, i, false);
     }
 
     for (uint8_t i = 0; i < 2; i++) {
@@ -346,7 +403,8 @@ static void lcd_setup(void) {
         lcd_write_symbol_page(&sym_t, i, false);
         lcd_write_kerning(2, false);
         lcd_write_symbol_page(&sym_colon, i, false);
-        lcd_write_kerning(9, false);
+        lcd_write_kerning(7, false);
+        lcd_write_integer_page(123, 3, i, false);
     }
 
     for (uint8_t i = 0; i < 2; i++) {