{"id":180,"date":"2012-07-09T14:47:37","date_gmt":"2012-07-09T14:47:37","guid":{"rendered":"http:\/\/bitmap2lcd.com\/blog\/?p=180"},"modified":"2012-07-25T05:45:59","modified_gmt":"2012-07-25T05:45:59","slug":"grayscale-glcd-16-gray-levels-basics","status":"publish","type":"post","link":"https:\/\/bitmap2lcd.com\/blog\/grayscale-glcd-16-gray-levels-basics\/","title":{"rendered":"Grayscale GLCD >> 16 gray levels basics"},"content":{"rendered":"

Bitmap2LCD<\/strong> is a universal programming tool for converting bitmaps\/images to GLCD for most graphic LCD controllers.<\/p>\n

This software tool can be used for\u00a0programming\u00a0embedded systems\u00a0connected to a Grayscale Small Graphic LCD<\/strong> ( OLED ) with a built-in COG LCD controller\u00a0similar to\u00a0the\u00a0ST7528.<\/p>\n

For a start,\u00a0here’s a short article about 4bpp grayscale (4-bits per pixel ) for displaying 16 levels of gray.<\/p>\n

The values from 0\u00a0\u00a0through 15 decimal (00 to 0F hex)\u00a0correspond to lightest (white) through\u00a0darkest (black) as shown in the representation below.<\/p>\n

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A single byte in the DDRAM can be used to store 2 pixels of information.<\/p>\n

When\u00a0using\u00a0a module with an on glass\u00a0ST7528 LCD controller, in the source code data byte, the first pixel data comes after the second pixel data :\u00a0 22221111<\/p>\n

With bitmap2LCD [from v2.0 upwards<\/span>] you can set\u00a0ON the automatic\u00a0pixel data nibble swapping, for a correct ordering in the source code output.<\/p>\n

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