Posted on January 13, 2005 at 05:51 Dear bugaloo,
I tried this program yesterday. Thanks for the hint!
There are many ''assertion failed'', because it checks, if the parameters are useful. But this prevents entering the parameters, if you have to change many at the same time.
I tried to boost Mode 2,3,7 to 1024x7.
It is not possible to simply change only parameter over the full scale, because the snapshot in between will not show a picture.
You habe to move syncs, and front/back porches a little bit, then correct witdth etc. to come around the assertions.
You need serveral small steps to reach the destination.
Sometimes increase the clock rate, to prevent your CRT from loosing sync. e.g. 25 -> 40 -> 65 MHz.
I could not enter the TFT parameters, too.
But it was possible to write to the BIOS Register Position 0h...0Ch like in the Bios with an other menu selection.
After inserting the correct timings via the back door, it was possibe to access syncs etc. via the tool, to move the picture.
Unfortunately the tft.c has a different order compared to the bios:
unsigned short HWT..... [] =
{
0x00, 0x0400, /* Input scan line active pixel count */
0x01, 0x002E, /* Input scan line back porch delay -1 */
0x02, 0x0008, /* Flat panel hsync width */
0x03, 0x009D, /* Flat panel horizontal back porch -2 */
0x04, 0x0400, /* Flat panel active pixel count */
0x05, 0x000A, /* Flat panel minimum front porch -1 */
0x06, 0x0005 /* Flat panel vsync width */
0x07, 0x0029, /* Flat panel vertical back porch */
0x08, 0x0300 /* Flat panel active line count */
0x09, 0x0000, /* Set Flat panel interlace control */
0x0a, 0x08FF, /* Set 10 KHz 50% duty cycle PWM (BIOS Position 0Ch) */
0x0c, 0x0, /* Set blank pixel red/green/blue values (BIOS 0A Low Byte) */
0x0d, 0x0 , /* Set blank pixel red/green/blue values BIOS 0A High Byte, but used for Clock-Index in BIOS!!! ), */
0x0e, 0x0, /* Set blank pixel red/green/blue values BIOS 0xB Low Byte */
0x0f, 0x99, /* set SYNC polarity control for LVDS (0x084CC014 bits 31:24) */
0xff /* END */
};
Don't forget to set the clock rate in the real VGA Bios (e.g. 0x0F for 65 MHz)
Attached is my first result for LVDS Display LTD104EA5S. Snycs might be weird for other displays, because this is a DE-Only display, but the picture is stable. The refresh rate is too low, but it works.
Best regards
Flipflop
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Attachments : XGAAtlas.rom :
https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006HttD&d=%2Fa%2F0X0000000aYN%2FUkqkBXBLcmD.edz4haZrgp27qPQCmmdLR0jBCSXeH_A&asPdf=false
