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HDMI to VGA

Question asked by Sudh33r on Sep 26, 2017
Latest reply on Sep 27, 2017 by JeyasudhaMuthuPerumal

Hi All,

 

We are using ADV7611 IC for HDMI to VGA conversion on our custom board based on imx6 Dual core.
Our issue is, no Hotplug Detect signal after configuring ADV7611 IC with EDID data from monitor.
We followed the steps provided in main.c file from CN0282-DesignSupport.rar

 

1. switch to ADV7611 VGA I2C
2. read EDID data from monitor -> We are able to receive 128 bytes EDID data
3. Prepare EDID -> which is 256 bytes (referred edid.c file )
4. Switch to ADV7611 HDMI I2C
5. Program ADV7611 with below configuration script

 

    0x98, 0xF4, 0x80,    //IO map
    0x98, 0xF5, 0x7C,
    0x98, 0xF8, 0x4C,
    0x98, 0xF9, 0x64,
    0x98, 0xFA, 0x6C,
    0x98, 0xFB, 0x68,
    0x98, 0xFD, 0x44,    
    0x98, 0x01, 0x06,    
    0x98, 0x02, 0xF7,    
    0x98, 0x03, 0x40,
    0x98, 0x04, 0x42,
    0x98, 0x05, 0x28,    
    0x98, 0x06, 0xA6,                    
    0x98, 0x0B, 0x44,
    0x98, 0x0C, 0x42,                
    0x98, 0x15, 0x80,
    0x98, 0x19, 0x8A,
    0x98, 0x14, 0x7F,
    0x98, 0x33, 0x40,            
    0x44, 0xBA, 0x01,    // CP map
    0x64, 0x40, 0x81,    // KSV Map            
    0x68, 0x9B, 0x03,    // HDMI map
    0x68, 0xC1, 0x01,
    0x68, 0xC2, 0x01,
    0x68, 0xC3, 0x01,
    0x68, 0xC4, 0x01,
    0x68, 0xC5, 0x01,
    0x68, 0xC6, 0x01,
    0x68, 0xC7, 0x01,
    0x68, 0xC8, 0x01,
    0x68, 0xC9, 0x01,
    0x68, 0xCA, 0x01,
    0x68, 0xCB, 0x01,
    0x68, 0xCC, 0x01,
    0x68, 0x00, 0x00,
    0x68, 0x83, 0xFE,
    0x68, 0x6F, 0x08,
    0x68, 0x85, 0x1F,
    0x68, 0x87, 0x70,
    0x68, 0x8D, 0x04,
    0x68, 0x8E, 0x1E,
    0x68, 0x1A, 0x8A,
    0x68, 0x57, 0xDA,
    0x68, 0x58, 0x01,
    0x68, 0x75, 0x10,
6. Program EDID configuration script
    0x68, 0x6C, 0xA3,    // enable manual HPA
    0x98, 0x20, 0x70,    // HPD low
    0x64, 0x74, 0x00,    // disable internal EDID
    0x6C, 0x00, ----,    // 256 bytes EDID data
    0x6C, 0x01, ----,
    .....
    0x6C, 0xFF, ----,  
    0x64, 0x74, 0x01,    // enable internal EDID
    0x98, 0x20, 0xF0,    // HPD high
    0x68, 0x6C, 0xA3,    // disable manual HPA

 

Attached is the reference file used for coding.

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