[display] Fix corruption in color lcd update.

target/dartuinoP0/memory_lcd.c

 /*
  * Copyright (c) 2015 Gurjant Kalsi <me@gurjantkalsi.com>
  *
  * Permission is hereby granted, free of charge, to any person obtaining
  * a copy of this software and associated documentation files
  * (the "Software"), to deal in the Software without restriction,
  * including without limitation the rights to use, copy, modify, merge,
  * publish, distribute, sublicense, and/or sell copies of the Software,
  * and to permit persons to whom the Software is furnished to do so,
  * subject to the following conditions:
@@ skipping 104 matching lines @@
 }
 
 
 
 static void mlcd_flush(uint starty, uint endy)
 {
     chip_select(true);
 
     static uint8_t localbuf[MLCD_BUF_SIZE];
     uint8_t *bufptr = localbuf;
+    uint8_t trailer = 0;
 
     // The first line is preceeded with a write command.
     *bufptr++ = MLCD_WR | vcom_state;
 
     vcom_state = vcom_state == VCOM_HI ? VCOM_LO : VCOM_HI;
 
     // Send the image data.
     for (uint j = starty; j <= endy; ++j) {
         *bufptr++ = (j + 1);
 
         bufptr += lcd_get_line(framebuffer, j, bufptr);
 
+        // 8 bit trailer per line
+        *bufptr++ = trailer;
+        if (j == endy) {
+            // 16 bit trailer on the last line
+            *bufptr++ = trailer;
+        }
+
         if (HAL_SPI_Transmit(&SpiHandle, localbuf, bufptr - localbuf, HAL_MAX_DELAY) != HAL_OK) {
             goto finish;
         }
 
         bufptr = localbuf;
-
-        *bufptr++ = (j + 1);
     }
 
-    uint8_t trailer = 0;
-    if (HAL_SPI_Transmit(&SpiHandle, &trailer, 1, HAL_MAX_DELAY) != HAL_OK) {
-        goto finish;
-    }
-
-
 finish:
     chip_select(false);
 }
 
 status_t display_get_info(struct display_info *info)
 {
     LTRACEF("display_info %p\n", info);
 
     info->framebuffer = (void *)framebuffer;
     info->format = FB_FORMAT;
     info->width = MLCD_WIDTH;
     info->height = MLCD_HEIGHT;
     info->stride = FB_STRIDE;
     info->flush = mlcd_flush;
 
     return NO_ERROR;
 }