lcd_offsets
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| - | ====== MIOS LCD Offsets ====== | ||
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| - | Some words by TK in response to [[http:// | ||
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| - | The display offsets are handled by MIOS in a way which allows to use the same cursor positions on any kind of LCD. With MIOS_LCD_YAddressSet the LCD specific cursor offsets are mapped to the MIOS specific cursor offsets.\\ | ||
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| - | **64 characters (0x40) are reserved for each line**, up to 4 lines are (natively) supported: | ||
| - | 1st line begins at 0x00\\ | ||
| - | 2nd line begins at 0x40\\ | ||
| - | 3rd line begins at 0x80\\ | ||
| - | 4th line begins at 0xc0\\ | ||
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| - | And these lines have to be mapped to the real address offsets of your LCD - this can normaly be found in the datasheet, the most common cases are documented in the functional description of MIOS_LCD_YAddressSet: | ||
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| - | For a 2x40 following settings are working:\\ | ||
| - | Y0: 0x00\\ | ||
| - | Y1: 0x40\\ | ||
| - | Y2: doesn' | ||
| - | Y3: doesn' | ||
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| - | (*) note: if a value between 0x80...0xff is specified here, it is assumed that the 3rd and 4th line is mapped to a second LCD\\ | ||
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| - | Centering the screen just means to add additional offsets to these addresses, e.g. let's say you've a 2x40 display, but only 16 columns are used, this means that you need to add 12 to each offset:\\ | ||
| - | Y0: 0x00 + (40-16)/2\\ | ||
| - | Y1: 0x40 + (40-16)/2\\ | ||
| - | Y2: doesn' | ||
| - | Y3: doesn' | ||
| - | \\ | ||
| - | Thats how MIOS supports LCDs. \\ | ||
lcd_offsets.1160904901.txt.gz · Last modified: 2008/07/20 12:43 (external edit)