Dave:
I found the color problem. There were some incorrect indices on pixel[].
I've alse changed the code a bit so Boris will render much faster. Rather
than sending one RGB pixel at a time I'm seen 768/3. I got the idea from
fillScreenBards(). Here's my displayimage().
void displayimage(){
char pixel[5], *data = header_data;
int i = width * height;
Transfer tbuffer[128*128*3+1];
void *buff_ptr = tbuffer;
LCDSendCommand(1, 0x2C);
int j = 0;
while(i-- > 0) {
HEADER_PIXEL(data,pixel);
tbuffer[j+0].data=(*pixel[2]* & 0xff);
tbuffer[j+0].type=1;
tbuffer[j+1].data=(*pixel[1]* & 0xff);
tbuffer[j+1].type=1;
tbuffer[j+2].data=(*pixel[0]* & 0xff);
tbuffer[j+2].type=1;
j +=3;
}
// SPIWriteChunk(buff_ptr, 128*128*3);
for(i=0;i<128;i++){
SPIWriteChunk(buff_ptr, 768);
buff_ptr += 768;
}
}
*Why do you only write 768 bytes at a time to the SPI?*
With only small changes the code here[1] drives the miniDisplay and sends a
bmp file to it.
--Mark
[1] https://github.com/jeidon/cfa_bmp_loader.git
On Wednesday, July 16, 2014 12:00:03 PM UTC-4, David Anders wrote:
>
> Mark,
>
>
> On Wednesday, July 16, 2014 8:42:31 AM UTC-5, Mark A. Yoder wrote:
>>
>> It works! Thanks. Though the background on Boris is greenish.
>>
>>
> that is odd! we've not had any reports of that issue during our testing.
> it is possible that the SPI timing could be off giving you a slightly
> shifted color spectrum, or possible the display is damaged. please email
> [email protected] <javascript:> and we'll get another minidisplay cape
> out to you to test...
>
>
>
>> There is a typo on the wiki. The tar command produces a directory called
>> Minidisplay-example with a capital M.
>>
>>
> sorry about that, the elinux.org wiki automatically makes the first
> letter of file uploads a capital. the original file was not capital....
>
>
>
>> I also had to run echo -10 > /sys/devices/bone_capemgr.*/slots
>> before echo BB-SPIDEV0 > /sys/devices/bone_capemgr.*/slots to disable a pwm
>> that was in conflict.
>>
>>
> had you previously loaded another device tree entry with PWM?
>
>
>
>> Thanks again...
>>
>>
> i did not get a chance yesterday to document it, but the header file for
> the boris image was generated using GIMP's export feature. it would be easy
> enough to add a parser to decode bmp or png files...
>
> Dave
>
>
--
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