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v4l2 Blackfin Capture Driver

The Blackfin Capture Driver is a v4l2 driver supporting several CMOS Camera and Video Decoders on multiple platforms.

VS6624:

ADV7183B:

ADV7842:

MT9M114:

Configure Kernel

You typically need to enable i2c support and the CMOS Camera or Video Decoder driver. The driver utilizes at least two buffers to store captured frames. All buffers are located in uncached memory area.

  • Config DMA region size:
    The size is dependent on image resolution, bytes per pixel and requested numbers of buffer
    Blackfin Processor Options  --->
    Uncached DMA region (Enable 4M DMA region)  --->
  • I2C support: 
    Device Drivers  --->
    <M> I2C support  --->
            I2C Hardware Bus support  --->
                <M> Blackfin TWI I2C support
                (100) Blackfin TWI I2C clock (kHz)
For BF561
            I2C Hardware Bus support  --->
                <M> GPIO-based bitbanging I2C
  • Enable v4l2 and capture driver: 
    Device Drivers  --->
    <M> Multimedia support  --->
        [*]   Cameras/video grabbers support
        [*]   Media Controller API (EXPERIMENTAL)
        [*]   V4L platform devices  --->
              <M>   Blackfin Video Capture Driver
        Encoders, decoders, sensors and other helper chips  --->
              <M> Analog Devices ADV7183 decoder
              <M> Analog Devices ADV7842 decoder
              <M> ST VS6624 sensor support
              <M> Aptina MT9M114 sensor support

Configure Userspace Application

  • In buildroot, enable V4L2 video test application to capture video file in BF609-EZKIT with ADV7842.
    Package Selection for the target  --->
    Miscellaneous  --->
        [*] V4L2 video test program

User application Interface

User space application should access the camera driver only via video4linux2 APIs.

  • The document of V4L2 can be found here.
  • An simple example can be found here.

Example usage

VS6624 Example

To setup a streaming video web camera to a specific IP address, you can use ffmpeg directly to perform this operation. You don't need to setup any additional software on the Blackfin Side. You can use broadcast addresses as well as direct udp IP connections. On the far side we use vlc to display the MPEG2 stream.

Board

modprobe i2c-bfin-twi
modprobe vs6624
modprobe bfin_video_capture

ffmpeg -f video4linux2 -s 320x240 -pix_fmt uyvy422 -r 25 -i /dev/video0 
-qscale 6 -vcodec mpeg2video -f mpeg2video udp://$PCIP:1234

PC

VLC->Media->Open Network Stream->udp://@$PCIP:1234
Note

When using VS6624 on BF609-ezkit, you need the expansion adapter card:http://docs.blackfin.uclinux.org/doku.php?id=hw:cards:609_adaptor. In this use case the 609 board boot mode should switch to Parallel Flash boot, due to hardware PIN conflict with SPI boot at this moment, this restriction will be removed soon after upgrading the expansion card hardware.

Set SW1 on the expansion card to 1 ON 2 OFF for VS6624 test.

ADV7183 Example

  1. Setup the bf561-ezkit or bf533-ezkit
  2. Enable ffmpeg

For the bf561-ezkit use the default configuration.

Connect a Composite Video Source to AVIN5

Board

modprobe i2c-gpio
modprobe adv7183
modprobe bfin_video_capture

ffmpeg -f video4linux2 -s ntsc -pix_fmt uyvy422 -r 5 -i /dev/video0 
-f mjpeg udp://$PCIP:1234

PC

VLC->Media->Open Network Stream->udp://@$PCIP:1234

ADV7842 Example

  • Put 720p output to ADV7842 HDMI port A, and use v4l2_video_capture to capture video file on BF609-EZKIT.
  • Generated yuv file can be played by raw sequence file player, for example pYUV. Or it can be as the input of ADV7511.
  • Bellow is the example:
    Linux version 3.3.0-ADI-2012R1-pre-dirty (test@linux87-bf609-std) (gcc version 4.3.5 (ADI-2012R1-RC2) ) #4 Thu Jul 19 00:19:39 CST 2012
register early platform devices
bootconsole [early_shadow0] enabled
ERROR: Not running on ADSP-BF609: unknown CPUID 0x0000 Rev 0.0
bootconsole [early_BFuart0] enabled
early printk enabled on early_BFuart0
Board Memory: 128MB
Kernel Managed Memory: 128MB
Memory map:
  fixedcode = 0x00000400-0x00000490
  text      = 0x00001000-0x001c9f50
  rodata    = 0x001c9f74-0x00267bac
  bss       = 0x00268000-0x0027b0e4
  data      = 0x0027b0e4-0x002a6000
    stack   = 0x002a4000-0x002a6000
  init      = 0x002a6000-0x0061f000
  available = 0x0061f000-0x06000000
  DMA Zone  = 0x06000000-0x08000000
Hardware Trace active and enabled
Blackfin support (C) 2004-2010 Analog Devices, Inc.
Compiled for ADSP-BF609 Rev 0.0
Blackfin Linux support by http://blackfin.uclinux.org/
Processor Speed: 500 MHz core clock, 125 MHz SCLk, 125 MHz SCLK0, 125 MHz SCLK1 and 250 MHz DCLK
NOMPU: setting up cplb tables
Instruction Cache Enabled for CPU0
  External memory: cacheable in instruction cache
  L2 SRAM        : uncacheable in instruction cache
Data Cache Enabled for CPU0
  External memory: cacheable (write-back) in data cache
  L2 SRAM        : uncacheable in data cache
Built 1 zonelists in Zone order, mobility grouping off.  Total pages: 24384
Kernel command line: root=/dev/mtdblock0 rw ip=10.100.4.50 earlyprintk=serial,uart0,57600 console=ttyBF0,57600 ip=10.100.4.50:10.100.4.174:10.100.4.174:255.255.255.0:bf609-ezkit:eth0:off
PID hash table entries: 512 (order: -1, 2048 bytes)
Dentry cache hash table entries: 16384 (order: 4, 65536 bytes)
Inode-cache hash table entries: 8192 (order: 3, 32768 bytes)
Memory available: 91124k/131072k RAM, (3556k init code, 1827k kernel code, 881k data, 32768k dma, 916k reserved)
NR_IRQS:299
Configuring Blackfin Priority Driven Interrupts
Console: colour dummy device 80x25~Mconsole [ttyBF0] enabled, bootconsole disabled
console [ttyBF0] enabled, bootconsole disabled
Calibrating delay loop... 995.32 BogoMIPS (lpj=1990656)
pid_max: default: 32768 minimum: 301
Mount-cache hash table entries: 512
Blackfin Scratchpad data SRAM: 4 KB
Blackfin L1 Data A SRAM: 16 KB (9 KB free)
Blackfin L1 Data B SRAM: 16 KB (16 KB free)
Blackfin L1 Instruction SRAM: 64 KB (50 KB free)
Blackfin L2 SRAM: 256 KB (256 KB free)
NET: Registered protocol family 16
gpiochip_add: registered GPIOs 0 to 111 on device: BFIN-GPIO
Blackfin DMA Controller
ezkit_init(): registering device resources
ezkit_init(): request emac pins failed
bio: create slab <bio-0> at 0
SCSI subsystem initialized
bfin-spi bfin-spi.0: bfin-spi probe success
bfin-spi bfin-spi.1: bfin-spi probe success
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
i2c-bfin-twi i2c-bfin-twi.0: Blackfin on-chip I2C TWI Contoller, regs_base@ffc01e00
i2c-bfin-twi i2c-bfin-twi.1: Blackfin on-chip I2C TWI Contoller, regs_base@ffc01f00
NET: Registered protocol family 23
Switching to clocksource bfin_cs_cycles
musb-hdrc: version 6.0, ?dma?, otg (peripheral+host)
NET: Registered protocol family 2
IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
TCP established hash table entries: 4096 (order: 3, 32768 bytes)
TCP bind hash table entries: 4096 (order: 2, 16384 bytes)
TCP: Hash tables configured (established 4096 bind 4096)
TCP reno registered
UDP hash table entries: 256 (order: 0, 4096 bytes)
UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
NET: Registered protocol family 1
msgmni has been set to 177
io scheduler noop registered (default)
bfin-uart: Blackfin serial driver
bfin-uart.0: ttyBF0 at MMIO 0xffc02000 (irq = 96) is a BFIN-UART
physmap platform flash device: 01000000 at b0000000
physmap-flash.0: Found 1 x16 devices at 0x0 in 16-bit bank. Manufacturer ID 0x000089 Chip ID 0x008821
Intel/Sharp Extended Query Table at 0x010A
Intel/Sharp Extended Query Table at 0x010A
Intel/Sharp Extended Query Table at 0x010A
Intel/Sharp Extended Query Table at 0x010A
Intel/Sharp Extended Query Table at 0x010A
Using buffer write method
Using auto-unlock on power-up/resume
cfi_cmdset_0001: Erase suspend on write enabled
Creating 3 MTD partitions on "physmap-flash.0":
0x000000000000-0x000000080000 : "bootloader(nor)"
0x000000080000-0x000000480000 : "linux kernel(nor)"
0x000000480000-0x000001000000 : "file system(nor)"
m25p80 spi0.4: unrecognized JEDEC id ffffff
CAN device driver interface
bfin_can bfin_can.0: bfin_can device registered(&reg_base=ffc00a00, rx_irq=55, tx_irq=56, err_irq=57, sclk=125000000)
        DWMAC100
 No HW DMA feature register supported
 Enhanced/Alternate descriptors
Initializing USB Mass Storage driver...
usbcore: registered new interface driver usb-storage
USB Mass Storage support registered.
input: bfin-rotary as /devices/platform/bfin-rotary/input/input0
i2c /dev entries driver
Linux media interface: v0.10
lirc_dev: IR Remote Control driver registered, major 252
IR NEC protocol handler initialized
IR RC5(x) protocol handler initialized
IR RC6 protocol handler initialized
IR JVC protocol handler initialized
IR Sony protocol handler initialized
IR RC5 (streamzap) protocol handler initialized
IR SANYO protocol handler initialized
IR MCE Keyboard/mouse protocol handler initialized
IR LIRC bridge handler initialized
Linux video capture interface: v2.00
ppi probe success
bfin_capture bfin_capture.0: v4l2 device registered
bfin_capture bfin_capture.0: video device registered as: video0
adv7842 0-0020: error reading 20, ff
adv7842 0-0020: select_input: SDP todo
adv7842 0-0020: R 0, G 0, B 0
adv7842 0-0020: Y 10, U 80, V 80
adv7842 0-0020: adv7842 found @ 0x40 (i2c-bfin-twi)
bfin_capture bfin_capture.0: v4l2 sub device registered
adv7842 0-0020: select_input: SDP todo
bfin-wdt: initialized: timeout=20 sec (nowayout=0)
Blackfin hardware CRC crypto driver
dma_alloc_init: dma_page @ 0x04afe000 - 8192 pages at 0x06000000
bfin-hmac-crc bfin-hmac-crc.0: initialized
usbcore: registered new interface driver usbhid
usbhid: USB HID core driver
TCP cubic registered
NET: Registered protocol family 17
can: controller area network core (rev 20090105 abi 8)
NET: Registered protocol family 29
eth0: device MAC address 00:e0:22:fe:88:1d
stmmac: probed
eth0: PHY ID 20005c90 at 1 IRQ 0 (stmmac-0:01) active
 No MAC Management Counters available
IP-Config: Complete:
     device=eth0, addr=10.100.4.50, mask=255.255.255.0, gw=10.100.4.174,
     host=bf609-ezkit, domain=, nis-domain=(none),
     bootserver=10.100.4.174, rootserver=10.100.4.174, rootpath=
Freeing unused kernel memory: 3556k freed


BusyBox v1.17.4 (2012-07-17 15:53:29 CST) hush - the humble shell

root:/> v4l2_video_capture -I 4 -F /adv7842.yuv
enum inputs
input[0]: Composite
input[1]: S-Video
input[2]: Component
input[3]: VGA
input[4]: HDMI
adv7842 0-0020: select_input: HDMI todo
set input to 4: support dv_timings
dv_timings: progressive,width=1280,height=720
hfrontporch=110,hsync=40,hbackporch=220,vfrontporch=5,vsync=5,vbackporch=20
enum formats
format[0]: YCbCr 4:2:2 Interleaved UYVY
format[1]: YCbCr 4:2:2 Interleaved UYVY
negotiated formats: 1280x720
field order: progressive
size = 1843200
bytesperline = 2560
pixelformat: UYVY
frame rate setting is not supported
request 3 buffers
bufffer[0]: offset = 0, lengeth = 1843200
bufffer[1]: offset = 1843200, lengeth = 1843200
bufffer[2]: offset = 3686400, lengeth = 1843200
stream on success
open image file '/adv7842.yuv' success
processing frame 0
1 frames captured
root:/>