LCD Inversion refactoring

lib/u8g2/u8g2_buffer.c

@@ -37,6 +37,7 @@
 #include <string.h>
 
 /*============================================*/
+
 void u8g2_ClearBuffer(u8g2_t* u8g2) {
     size_t cnt;
     cnt = u8g2_GetU8x8(u8g2)->display_info->tile_width;
@@ -45,13 +46,6 @@ void u8g2_ClearBuffer(u8g2_t* u8g2) {
     memset(u8g2->tile_buf_ptr, 0, cnt);
 }
 
-void u8g2_FillBuffer(u8g2_t* u8g2) {
-    size_t cnt;
-    cnt = u8g2_GetU8x8(u8g2)->display_info->tile_width;
-    cnt *= u8g2->tile_buf_height;
-    cnt *= 8;
-    memset(u8g2->tile_buf_ptr, 255, cnt);
-}
 /*============================================*/
 
 static void u8g2_send_tile_row(u8g2_t* u8g2, uint8_t src_tile_row, uint8_t dest_tile_row) {

lib/u8g2/u8g2_glue.c

@@ -280,3 +280,17 @@ void u8g2_Setup_st756x_flipper(
     buf = u8g2_m_16_8_f(&tile_buf_height);
     u8g2_SetupBuffer(u8g2, buf, tile_buf_height, u8g2_ll_hvline_vertical_top_lsb, rotation);
 }
+
+void u8x8_d_st756x_set_inversion(u8x8_t* u8x8, bool arg) {
+    // if arg is true - set last bit to 1 (inversion ON)
+    if(arg) {
+        u8x8_cad_StartTransfer(u8x8);
+        u8x8_cad_SendCmd(u8x8, ST756X_CMD_INVERSE_DISPLAY | 0b01);
+        u8x8_cad_EndTransfer(u8x8);
+        // else use standart command with 0 in last bit
+    } else {
+        u8x8_cad_StartTransfer(u8x8);
+        u8x8_cad_SendCmd(u8x8, ST756X_CMD_INVERSE_DISPLAY);
+        u8x8_cad_EndTransfer(u8x8);
+    }
+}

lib/u8g2/u8g2_glue.h

@@ -16,3 +16,5 @@ void u8g2_Setup_st756x_flipper(
 void u8x8_d_st756x_init(u8x8_t* u8x8, uint8_t contrast, uint8_t regulation_ratio, bool bias);
 
 void u8x8_d_st756x_set_contrast(u8x8_t* u8x8, int8_t contrast_offset);
+
+void u8x8_d_st756x_set_inversion(u8x8_t* u8x8, bool arg);