diff --git a/main.c b/main.c
--- a/main.c
+++ b/main.c
@@ -49,7 +49,7 @@ int main(void)
     spi_init();
 
     // Init OLED over SPI
-    ssd1306_Init();
+    ssd1306_init();
     ssd1306_clearscreen();
    
     // Default settings 
@@ -76,8 +76,8 @@ int main(void)
       status.state = STATE_PREHEAT_BREW; 
 
     // Startup screen 
-    ssd1306_DrawString("therm v0.2", 1, 40);
-    ssd1306_DrawString("protofusion.org/therm", 3, 0);
+    ssd1306_drawstring("therm v0.2", 1, 40);
+    ssd1306_drawstring("protofusion.org/therm", 3, 0);
 
     HAL_Delay(1000);
 
@@ -145,7 +145,7 @@ int main(void)
             {
                 char tempstr[6];
                 itoa(ssr_output, tempstr, 10);
-                ssd1306_DrawString(tempstr, 0, 90);
+                ssd1306_drawstring(tempstr, 0, 90);
 
                 HAL_GPIO_WritePin(SSR_PIN, 1);
                 HAL_GPIO_WritePin(LED_POWER, 1);