Detecting Colour and Monochrome Monitors: Difference between revisions
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m (Update function to ISO and better coding convention) |
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== The Function == |
== The Function == |
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<source lang="c"> |
<source lang="c"> |
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#include <stdint.h> |
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/* |
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Video card mono/colour detection. |
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enum video_type |
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Return values: false=colour |
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true=monochrome |
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*/ |
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_Bool detectVideoType(void) |
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{ |
{ |
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VIDEO_TYPE_NONE = 0x00, |
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char c=(*(volatile USHORT*)0x410)&0x30; |
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VIDEO_TYPE_COLOUR = 0x20, |
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VIDEO_TYPE_MONOCHROME = 0x30, |
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}; |
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uint16_t detect_bios_area_hardware(void) |
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//c can be 0x00 or 0x20 for colour, 0x30 for mono. |
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{ |
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return (c==0x30); |
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const uint16_t* bda_detected_hardware_ptr = (const uint16_t*) 0x410; |
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return *bda_detected_hardware_ptr; |
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} |
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enum video_type get_bios_area_video_type(void) |
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{ |
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return (enum video_type) (detect_bios_area_hardware() & 0x30); |
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} |
} |
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</source> |
</source> |
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Revision as of 00:45, 20 December 2013
Detecting whether a user has a colour or monochrome video card is a trivial task. The BIOS data segment has a value in it for this information. Below is a function (in ISO C) to retrieve this:
The Function
#include <stdint.h>
enum video_type
{
VIDEO_TYPE_NONE = 0x00,
VIDEO_TYPE_COLOUR = 0x20,
VIDEO_TYPE_MONOCHROME = 0x30,
};
uint16_t detect_bios_area_hardware(void)
{
const uint16_t* bda_detected_hardware_ptr = (const uint16_t*) 0x410;
return *bda_detected_hardware_ptr;
}
enum video_type get_bios_area_video_type(void)
{
return (enum video_type) (detect_bios_area_hardware() & 0x30);
}