HI Nimesh,
The code that transfers the data to the output buffer
is in
linux-2.6.x/drivers/video/bfin_ad7171fb_main.c
Here is the code that updates the frame buffer
void bfin_framebuffer_update(struct ycrcb_t *ycrcb_buffer, struct rgb_t
*rgb_buffer)
{
unsigned char *rgb_base = (unsigned char *)rgb_buffer;
unsigned char *ycrcb_base = (unsigned char *)ycrcb_buffer;
unsigned char *odd_yuv;
unsigned char *even_yuv;
unsigned char *rgb_ptr;
int oddline, evenline,rgbline;
for (oddline = FIELD1_AV_START, evenline = FIELD2_AV_START, rgbline = 0;
oddline <= FIELD1_AV_END; oddline ++, evenline ++) {
odd_yuv= (unsigned char *)((ycrcb_base + (oddline *
YCBCR_WIDTH))+HB_LENGTH+8);
rgb_ptr = (unsigned char *)(rgb_base + (rgbline++)*RGB_WIDTH*3);
fb_memcpy((u32 *)rgb_l1,(u32 *)rgb_ptr,RGB_WIDTH*3/4);
rgb2yuv(rgb_l1,yuv_l1,RGB_WIDTH);
fb_memcpy((u32 *)odd_yuv, (u32 *)yuv_l1, RGB_WIDTH/2);
even_yuv = (unsigned char *)((ycrcb_base + (evenline *
YCBCR_WIDTH))+HB_LENGTH+8);
rgb_ptr = (unsigned char *)(rgb_base + (rgbline++)*RGB_WIDTH*3);
fb_memcpy((u32 *)rgb_l1,(u32 *)rgb_ptr,RGB_WIDTH*3/4);
rgb2yuv(rgb_l1,yuv_l1,RGB_WIDTH);
fb_memcpy((u32 *)even_yuv, (u32 *)yuv_l1, RGB_WIDTH/2);
}
}
The rgb2yuv code is in
linux-2.6.x/drivers/video/rgb2ycbcr.S
Here is its function
* Author: Aubrey.Li <[EMAIL PROTECTED]>
*
* Created:
* Description: In this function the range of R, G and B is 0 to 255
and the
* output range of Y, Cb and Cr is also 0 to 250.
* Input format: RGBRGB..., Output format: CbYCrYCbYCrY...
* The formula implemented is as below:
* Y = (0.299R + 0.587G + 0.114B)*250/255
* Cb = (-0.169R - 0.331G + 0.500B + 128)*250/255
* Cr = (0.500R - 0.419G - 0.081B + 128)*250/255
* 128 is added to Cb and Cr to get the output in the
range 0 to
* 250.
* Prototype: void rgb2yuv(unsigned char rgb[], unsigned char yuv[],
int n);
This is some neat assembly code to use the DSP stuff to run the
conversion as a fixed point function.
The key to getting your application running is knowing what the
AD7179 needs for a data format and detecting any difference between that
device and the default 7171 device
In taking a quick look at then data sheets for both devices I cannot
immediately see any magic bit that needs to be set to get you what you want.
Take a look at the set up of the 7171 system we see this in
the function adv7171_detect_client
}
#ifdef CONFIG_NTSC
i = adv7171_write_block(client, init_NTSC, sizeof(init_NTSC));
#else /* CONFIG_PAL */
i = adv7171_write_block(client, init_PAL, sizeof(init_PAL));
#endif
if (i >= 0) {
i = adv7171_write(client, 0x07, TR0MODE | TR0RST);
i = adv7171_write(client, 0x07, TR0MODE);
i = adv7171_read(client, 0x12);
printk(KERN_INFO "%s_attach: rev. %d at 0x%02x\n",
I2C_NAME(client), i & 1, client->addr << 1);
}
if (i < 0) {
printk(KERN_ERR "%s_attach: init error 0x%x\n",
I2C_NAME(client), i);
}
This is where the 7171 is set up.
Make sure that the 7179 is set up properly.
All this may still not get you here but at least you can see how the
7171 unit is set up.
Contact me directly if you need any more help.
[EMAIL PROTECTED]
Regards
Phil Wilshire
nimesh kanoth wrote:
Dear sir,
We are doing one project in BF561, We are facing some problem in
framebuffer device
we have an encoder AD7179 . We wriiten the driver part as like AD7171 ..
with minor change in DMA and i2c . Can you help us regarding this..
If so I will send the code and details....
we are getting picture on screen but not color is not correct .. instead
of one picture we are
gettin three more picture. We feel the function rgbtoyuv have some
problem or we are not able to make out..
Please help us to sort out this..
Rgds
nimesh
*/Phil Wilshire <[EMAIL PROTECTED]>/* wrote:
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