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How can I access I2C bus in VGA Port

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mohd_ind00

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why i2c at vga port

Hi All,

I am trying to test VGA Connector of PC, in that i can not find any method to directly access the I2C lines in VGA.

Is it possible to send some data on i2c lines using programming or not i don't. Please Help..

tnx

Imran
 

bilgekaan

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Hi,
you are trying to access DDC EEPROM through VGA connector.EEPROM contains information about the video timings,supported format (EDID data )....etc

Address of EEPROM is 0xA0 , most of them are write protected. Only reead operation is available. It ıs usually 128 byte but some devices has extended version of EDID data so data length is 256. But to access second 128 byte you must use 0xA2

First using these address above, try to get ACK from device. You may search internet for special EEPROMs for DDC like 24LC21
 

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