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by vchristo
Tue Oct 29, 2013 8:44 pm
Forum: Bare metal, Assembly language
Topic: Video memory map
Replies: 4
Views: 2468

Re: Video memory map

thank you very much, it is a beginning.
I'm working on the code when I get it, I'll share :D
by vchristo
Sun Oct 27, 2013 2:48 am
Forum: Bare metal, Assembly language
Topic: Video memory map
Replies: 4
Views: 2468

Re: Video memory map

Dear DexOS, thanks for your quick replay, but I am developing a little system in C to acquire data from a CCD, and write it into the sd-card, this part of project are working, and at now I am trying to show the images acquired from ccd to the framebuffer. I found some things about mail box, but I fo...
by vchristo
Sat Oct 26, 2013 3:03 am
Forum: Bare metal, Assembly language
Topic: Video memory map
Replies: 4
Views: 2468

Video memory map

Hi, friends, we know the RPI has a video memory, and the HDMI or composite video, out put to screen, the content of this memory area. My question are, can I write a pixel directly into of this memory? What is the physical address of this memory? please remember I am not using any framebuffer driver,...
by vchristo
Sat Oct 26, 2013 2:34 am
Forum: Bare metal, Assembly language
Topic: SD card access
Replies: 8
Views: 5307

Re: SD card access

Hi, I modified the code from https://github.com/vanvught/OpenILDA/tree/master/sdcard-mmcbb to works with chibios-rpi, and it works fine using fat file system. It is work without spi driver, it is not so fast, but works very fine. if you want I can share my changes. the original lines are commented. ...
by vchristo
Thu Oct 17, 2013 9:02 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: External SDCARD with FatFs module
Replies: 12
Views: 9349

Re: External SDCARD with FatFs module

Hi friend. First time thank you for this simple and functional solution. I have tested and it works very fine, when it works alone (nothing more device on SPI bus) but I found a trouble when I connect the ADC (mcp3004) on SPI bus as CS0. if I execute the readout or write to sd card before initialize...
by vchristo
Sun Oct 06, 2013 3:25 am
Forum: C/C++
Topic: Hacking spi_bcm2708
Replies: 0
Views: 889

Hacking spi_bcm2708

Hi friends, Anyone know any place where, I can find the flowchart or the manual of the spi_bcm2708, I'm a beginner about linux module, but I'm interested to make some changes in it, but I don't know the exact place on the code I will made the changes, I just needed to put the driver to read several ...
by vchristo
Mon Sep 23, 2013 1:55 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: SPI driver latency and a possible solution
Replies: 241
Views: 137307

Re: SPI driver latency and a possible solution

Dear friends, I need your help about spi-bcm2708 driver, I'm trying to read the mcp3008, synchronized with my hardware developed to download 4Mpixel from a CCD. I was trying chibios-rpi, it's works fine but are so hard to develop another functionalities likes disk i/o, and display interface. At now ...

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