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by kondaveetiarungopal
Wed Feb 20, 2019 10:55 am
Forum: Camera board
Topic: camera unable to capture image and trouble shooting and code flow of kernel
Replies: 14
Views: 1048

Re: camera unable to capture image and trouble shooting and code flow of kernel

Hi 6by9, Thank you for your reply.yes i gone throught the link and i understand lots of inputs from above link, can you Please give some inputs to understand more in camera driver stack.i got /dev/video0 and /dev/i2c-0 for sensor driver.. 1)can you Please correct me if i did any wrong understanding....
by kondaveetiarungopal
Mon Feb 18, 2019 8:47 am
Forum: Camera board
Topic: camera unable to capture image and trouble shooting and code flow of kernel
Replies: 14
Views: 1048

Re: camera unable to capture image and trouble shooting and code flow of kernel

Hi Jamesh,

can you Please give some inputs understanding of camera driver from the Arm side.because my intention is to change run time attributes like fps and mode and colour ....with respect to the device tree..In device tree we are configured information about the irq and memory maps...
by kondaveetiarungopal
Mon Feb 18, 2019 8:44 am
Forum: Camera board
Topic: camera unable to capture image and trouble shooting and code flow of kernel
Replies: 14
Views: 1048

Re: camera unable to capture image and trouble shooting and code flow of kernel

Lets go back to first pinciples. WHat does `vgencmd get_camera` return? it will check in the camera sensor connected or not and supported information. Does Raspistill work? no by using the bcmunicam module it will not work. We need to ensure the camera is detected and works with the standard test a...
by kondaveetiarungopal
Mon Feb 18, 2019 6:05 am
Forum: Camera board
Topic: camera unable to capture image and trouble shooting and code flow of kernel
Replies: 14
Views: 1048

Re: camera unable to capture image and trouble shooting and code flow of kernel

Hi 6by9 . right now iam using officially raspberry pi kernel camera with 5MP.Please find attached link https://robu.in/product/raspberry-pi-camera-module/?gclid=EAIaIQobChMIgMDvlMjE4AIVlaqWCh1SBAjGEAQYASABEgKnafD_BwE you said two interfaces one is bcm2835-unicam(ARM Side with out VC) and bcm2835-v4l...
by kondaveetiarungopal
Fri Feb 15, 2019 12:22 pm
Forum: Camera board
Topic: camera unable to capture image and trouble shooting and code flow of kernel
Replies: 14
Views: 1048

Re: camera unable to capture image and trouble shooting and code flow of kernel

Hi 6by9, Thank you for excellent reply.Please give some inputs to understand the camera framework based upon your inputs i understand some thing.can you Please verify my clarification is corrrect or not. 1)bcm2835-v4l2 is module is the direct communication to GPU.from GPU we are getting the finalise...
by kondaveetiarungopal
Thu Feb 14, 2019 2:35 pm
Forum: Camera board
Topic: camera unable to capture image and trouble shooting and code flow of kernel
Replies: 14
Views: 1048

Re: camera unable to capture image and trouble shooting and code flow of kernel

Hi @Jamesh and 6by9 Thank you your reply.iam new to camera driver development.so now iam try to understand the camera driver flow in kernel. doubts Camera capturing:- 1) raspi-config and i select camera and reboot the device then iam using raspistill -o image.jpg . image was captured but when i see ...
by kondaveetiarungopal
Wed Feb 13, 2019 3:29 pm
Forum: Camera board
Topic: camera unable to capture image and trouble shooting and code flow of kernel
Replies: 14
Views: 1048

camera unable to capture image and trouble shooting and code flow of kernel

Hi, iam using raspberry pi camera.when i try to capture images using raspistill it is showing output like this mmal: Cannot read cameara info, keeping the defaults for OV5647 mmal: mmal_vc_component_create: failed to create component ‘vc.ril.camera’ (1:ENOMEM) mmal: Failed to create camera component...
by kondaveetiarungopal
Fri Feb 01, 2019 6:09 am
Forum: General discussion
Topic: understanding regulator frame work
Replies: 4
Views: 381

Re: understanding regulator frame work

Your post doesn't make much sense. No model of RPi has any means of measuring the current it or any part of it is drawing. The 5 volt and 3.3 volt regulators are set to those fixed voltages. What exactly are you trying to achieve? HI Thank you for giving valuable reply.i try to understand the regul...
by kondaveetiarungopal
Thu Jan 31, 2019 2:41 pm
Forum: General discussion
Topic: understanding regulator frame work
Replies: 4
Views: 381

understanding regulator frame work

Hi can you Please tell me the how to read the how much voltage and current drawn by the kernel module by using the regulator frame work API, can you Please send sample example for this one.i found some information in the device tree. vdd_5v0_reg: fixedregulator_5v0 { compatible = "regulator-fixed"; ...
by kondaveetiarungopal
Mon Jan 21, 2019 7:24 am
Forum: Bare metal, Assembly language
Topic: isr in fiq mode and changing dynamicle mode in arm
Replies: 0
Views: 650

isr in fiq mode and changing dynamicle mode in arm

1)can you Please send any practical examples on the how to run isr in the fiq mode and is it possible to run the gpio isr in the fiq mode. 2)how the debugging the softirq and tasklets and workqueues in the rapsberry pi.suppose i got softlockup in the raspbery pi.can you Please tell me the how to deb...
by kondaveetiarungopal
Sat Jan 19, 2019 8:50 am
Forum: Advanced users
Topic: config.txt file kernel reading procedure
Replies: 9
Views: 1053

Re: config.txt file kernel reading procedure

2) No. and 3) No. That stuff is proprietary, it's undocumented. You won't get any details beyond what's discussed on https://www.raspberrypi.org/forums/viewforum.php?f=72 Hi DougieLawson, Thank you for giving quick responce.Please give your valuable reply. 1)can you Please send any practical exampl...
by kondaveetiarungopal
Mon Jan 14, 2019 5:53 am
Forum: Advanced users
Topic: config.txt file kernel reading procedure
Replies: 9
Views: 1053

Re: config.txt file kernel reading procedure

1. The booting process is documented at: https://www.raspberrypi.org/documentation/configuration/boot_folder.md 2. The source code for bootcode.bin and start*.elf is propietary and not published. Those things read config.txt, configure the hardware and pass cmdline.txt to the kernel. 3. Is unanswer...
by kondaveetiarungopal
Mon Jan 14, 2019 5:31 am
Forum: Advanced users
Topic: vcgencmd source code
Replies: 4
Views: 814

Re: vcgencmd source code

https://github.com/raspberrypi/userland/blob/master/host_applications/linux/apps/gencmd/gencmd.c https://github.com/raspberrypi/firmware/wiki/Mailboxes may also be of interest Hi, Thank you for your reply. i think it is haveing the some libraries source code because in c application they are called...
by kondaveetiarungopal
Sat Jan 12, 2019 7:29 pm
Forum: Advanced users
Topic: vcgencmd source code
Replies: 4
Views: 814

vcgencmd source code

Hi,

can you Please send a source code for the vcgencmd commands .how temparature is reading from the kernel level by using the vcgencmd.

how to communicate from cpu to gpu and any example..
by kondaveetiarungopal
Sat Jan 12, 2019 6:59 pm
Forum: Advanced users
Topic: config.txt file kernel reading procedure
Replies: 9
Views: 1053

Re: config.txt file kernel reading procedure

The Linux kernel doesn't read config.txt. The bootloader running on the Videocore GPU reads the config.txt file and builds the kernel command line based on config.txt and cmdline.txt. HI Thank you for your reply. 1)can you Please send a booting process for the raspberry pi? 2)can you please send a ...
by kondaveetiarungopal
Thu Dec 27, 2018 10:34 am
Forum: Advanced users
Topic: config.txt file kernel reading procedure
Replies: 9
Views: 1053

config.txt file kernel reading procedure

HI, I am working on the raspberry pi 3.so dynamically we are changing the parameters for kernels like memory and frequency and i2c/spi .... can you Please tell me the how the kernel is reading config.txt file during kernel initialization. suppose if i change the CPU frequency how frequency was chang...
by kondaveetiarungopal
Fri Dec 21, 2018 5:09 am
Forum: Graphics, sound and multimedia
Topic: config.txt file kernel reading procedure and DCVS
Replies: 0
Views: 541

config.txt file kernel reading procedure and DCVS

HI, I am working on the raspberry pi 3.so dynamically we are changing the parameters for kernels like memory and frequency and i2c/spi .... can you Please tell me the how the kernel is reading config.txt file during kernel initialization. suppose if i change the CPU frequency how frequency was chang...
by kondaveetiarungopal
Sat Nov 24, 2018 1:54 pm
Forum: Official Foundation Display
Topic: official display with dsi interface for bought
Replies: 6
Views: 3655

Re: official display with dsi interface for bought

what are the kernel changes i have to do for bring up of that display?
by kondaveetiarungopal
Sat Nov 24, 2018 1:53 pm
Forum: Graphics, sound and multimedia
Topic: audio drivers understanding
Replies: 4
Views: 2583

Re: audio drivers understanding

HI,

Can you Please give any inputs for understanding the audio drivers.
by kondaveetiarungopal
Thu Nov 15, 2018 5:59 am
Forum: Graphics, sound and multimedia
Topic: audio drivers understanding
Replies: 4
Views: 2583

Re: audio drivers understanding

Hi,

Can you Please tell me the how to understand the onboard audo drivers in linux kernel for raspberry pi.
by kondaveetiarungopal
Tue Nov 13, 2018 7:11 am
Forum: Official Foundation Display
Topic: official display with dsi interface for bought
Replies: 6
Views: 3655

Re: official display with dsi interface for bought

HI, Thank you for your reply. The DSI interface is usually run from the GPU, so the source code is unavailable can you Please elaborate above statement.from above Statement DSI Host in GPU or CPU? we are connecting lCD so directly it is connecting to GPU or CPU? 2)if i bought that display how to und...
by kondaveetiarungopal
Tue Nov 13, 2018 7:05 am
Forum: Graphics, sound and multimedia
Topic: audio drivers understanding
Replies: 4
Views: 2583

Re: audio drivers understanding

1)how to understand the jack output from pi?
2)can you Please tell me the what are the driver files it is using in Linux kernel for audio?
can you Please tell me the answers to the above questions.
by kondaveetiarungopal
Mon Nov 12, 2018 10:56 am
Forum: Official Foundation Display
Topic: official display with dsi interface for bought
Replies: 6
Views: 3655

official display with dsi interface for bought

Hi, can you Please tell me how to interface display using dsi Interface.can you Please send a link for official display with dsi interface can you Please share a any docucment related to the dsi interface layer..what are the driver files it is containing in the linux kernel.how to enable the dsi rel...
by kondaveetiarungopal
Mon Nov 12, 2018 10:50 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: timers in raspberry pi understanding
Replies: 3
Views: 2023

Re: timers in raspberry pi understanding

Can you Please clarify my doubts
by kondaveetiarungopal
Mon Nov 12, 2018 10:50 am
Forum: Graphics, sound and multimedia
Topic: audio drivers understanding
Replies: 4
Views: 2583

audio drivers understanding

Hi,
Iam new to audio drivers.can you Please tell me how to understand the audio drivers in raspberry pi?
1)how to understand the jack output from pi?
2)can you Please tell me the what are the driver files it is using in linux kernel?
3)how the pwm works in audio sound?

Reg,

K.Arungopal

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