diff --git a/firmware/src/main.c b/firmware/src/main.c
index d51eb62..6c4379d 100644
--- a/firmware/src/main.c
+++ b/firmware/src/main.c
@@ -335,21 +335,24 @@ static void lcd_splash(void) {
     }
 }
 
-static void twi_error(void) {
-    lcd_fill(0xFF);
+static void twi_error(bool inverted) {
+    if (inverted)
+        lcd_fill(0xFF);
+    else
+        lcd_fill(0x00);
 
     for (uint8_t i = 0; i < 2; i++) {
         lcd_move_cursor(0, i);
-        lcd_write_string_page("TW_STATUS:\0", i, true);
-        lcd_write_kerning(2, true);
-        lcd_write_integer_page(TW_STATUS, 3, i, true);
+        lcd_write_string_page("TW_STATUS:\0", i, inverted);
+        lcd_write_kerning(2, inverted);
+        lcd_write_integer_page(TW_STATUS, 3, i, inverted);
     }
 
     for (uint8_t i = 0; i < 2; i++) {
         lcd_move_cursor(0, i + 2);
-        lcd_write_string_page("TW_DATA:\0", i, true);
-        lcd_write_kerning(16, true);
-        lcd_write_integer_page(TWDR, 3, i, true);
+        lcd_write_string_page("TW_DATA:\0", i, inverted);
+        lcd_write_kerning(16, inverted);
+        lcd_write_integer_page(TWDR, 3, i, inverted);
     }
 
     for (;;);
@@ -360,7 +363,7 @@ static void twi_start(void) {
     while (!(TWCR & (1 << TWINT))); // Wait until start is transmitted
 
     if (TW_STATUS != TW_START) // Check status
-        twi_error();
+        twi_error(true);
 }
 
 static uint8_t twi_transmit(const uint8_t data) {
@@ -386,11 +389,11 @@ static uint8_t twi_read_register(const uint8_t address,
                                  const uint8_t reg) {
     twi_start();
 
-        twi_error();
     if (twi_transmit(address << 1) != TW_MT_SLA_ACK)
+        twi_error(true);
 
     if (twi_transmit(reg) != TW_MT_DATA_ACK)
-        twi_error();
+        twi_error(true);
 
     twi_stop();
 
@@ -398,11 +401,11 @@ static uint8_t twi_read_register(const uint8_t address,
 
     twi_start();
 
-        twi_error();
     if (twi_transmit((address << 1) + 1) != TW_MR_SLA_ACK)
+        twi_error(true);
 
     if (twi_receive() != TW_MR_DATA_NACK)
-        twi_error();
+        twi_error(true);
 
     twi_stop();
 
@@ -414,14 +417,14 @@ static void twi_write_register(const uint8_t address,
                                const uint8_t data) {
     twi_start();
 
-        twi_error();
     if (twi_transmit(address << 1) != TW_MT_SLA_ACK)
+        twi_error(true);
 
     if (twi_transmit(reg) != TW_MT_DATA_ACK)
-        twi_error();
+        twi_error(true);
 
     if (twi_transmit(data) != TW_MT_DATA_ACK)
-        twi_error();
+        twi_error(true);
 
     twi_stop();
 }