Texas Instruments SimpleLink CC3220-OV788 User manual
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SimpleLink™ CC3220-OV788 Audio/Video Streaming Reference
Application Report
SWRA599–March 2018
SimpleLink™ CC3220-OV788 Audio/Video Streaming
Reference
ABSTRACT
This document demonstrates the ability of the CC3220 to provide a full system solution for audio-video
streaming applications.
Contents
1 Introduction ................................................................................................................... 2
2 Hardware Setup.............................................................................................................. 3
3 Running the Setup ......................................................................................................... 10
List of Figures
1 System Block Diagram...................................................................................................... 2
2 CC3220 LaunchPad......................................................................................................... 4
3 Omnivision OV788 Reference Board ..................................................................................... 5
4 Cable Twist................................................................................................................... 6
5 OV788 Adapter Booster Pack Connection ............................................................................... 7
6 CC3220 LaunchPad Setup................................................................................................. 8
7 RS232 Debug Board Setup ................................................................................................ 9
8 Uniflash File System....................................................................................................... 10
9 Starting Provisioning....................................................................................................... 11
10 Successful Provisioning ................................................................................................... 12
11 Camera IP Address........................................................................................................ 12
12 mDNS Device Discovery.................................................................................................. 12
13 IP Address from mDNS ................................................................................................... 13
14 Open Network Stream..................................................................................................... 14
15 Enter Network URL ........................................................................................................ 14
16 Open Network Stream..................................................................................................... 15
17 Enter Network URL ........................................................................................................ 16
18 Choose Stream............................................................................................................. 17
19 Enter Network URL ........................................................................................................ 18
20 Final Setup.................................................................................................................. 19
List of Tables
1 Key System Specifications ................................................................................................. 2
Trademarks
SimpleLink is a trademark of Texas Instruments.
iOS is a trademark of Apple.
Android is a trademark of Google LLC.
Wi-Fi is a registered trademark of Wi-Fi Alliance.
All other trademarks are the property of their respective owners.
Introduction
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1 Introduction
1.1 System Description
This software reference combines TI wireless technology with OmniVision A/V technology to enable live
streaming of audio and video data over Wi-Fi®. This is an integrated solution demonstrating the ability of
the CC3220 to provide a full system solution for audio-video streaming applications.
1.2 System Block Diagram
Figure 1. System Block Diagram
1.3 System Operation
On boot-up, the CC3220 application initializes the OV788 by loading its firmware and sending commands
to configure the settings of the device. In parallel, the CC3220 begins connecting to an access point. After
the AP connection, the CC3220 then opens an RTSP server on the local network, and waits for RTSP
clients, such as media player applications, to connect and request live streams.
The CC3220 does not buffer video or audio data, but rather sends them out immediately over the network
when received by the OV788. Thus, any latency seen in the video stream is mostly due to buffering on the
part of the streaming client application. In a dedicated use case, this could be reduced by the system
developer by using a custom application instead of using open source.
1.4 Key System Specifications
Table 1. Key System Specifications
PARAMETER SPECIFICATION DETAILS
Streaming quality Video 720p, 30 fps, 2 Mbps
Audio PCM, 16 bps, 11025 Hz
Application protocols RTP/RTSP
Supported Wi-Fi networks 802.11 b/g/n
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2 Hardware Setup
The following pieces of hardware are required:
• CC3220S-LAUNCHXL or CC3220SF-LAUNCHXL
• BOOSTXL-OV788ADAPT
• Omnivision OV788 reference board V3
– Order from Arrow: https://www.arrow.com/en/products/ov09712-ecvf-aw1b/omnivision-technologies
• 802.11 b/g/n Wi-Fi Access Point
2.1 CC3220 Launchpad Setup
Set up the jumpers on the CC3220 LaunchPad as shown in Figure 2.
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2.2 Omnivision OV788 Reference Board
The OV788 reference board V3 contains an OV788 and connectors for a sensor and optics board. The
sensor board to be mounted should contain an OV9732, because the firmware loaded to the OV788 by
the CC3220 (dsif_slave_9732.bin) is specific to this sensor. Mount the sensor on the board as shown in
Figure 3.
Figure 3. Omnivision OV788 Reference Board
Some ECOs may need to be performed on the OV788 reference board to ensure the correct boot mode is
employed, and that reset lines are connected. Verify the following, and make ECOs if necessary:
• Remove R121
• Remove R30
• Populate R136 with 0 Ω
• Populate R29 with 0 Ω
• Populate R31 with 100 Ω
• Populate R32 with 100 Ω
Hardware Setup
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If the onboard regulator for the 3_6V line does not supply 3.6 V, additional changes must be made. The
voltage from the 3_6V regulator can be measured from header J2, pin 12. If the measured voltage is not
3.6 V, make the following changes:
• Change R46 to 200 kΩ
• Change R47 to 40 kΩ
If using the Omnivision PIR and LED board, this enables the OV788 to sample sound from the onboard
microphone. The sound is sampled directly by the OV788 for this reference. The audio data is sent to the
CC3220 over the SPI interface with the video data. Currently the microphone is the only functional
component on this board.
There are some hardware considerations when using this:
• Mount a microphone on MIC2
• To reduce interference and get the best audio quality, twist the cable to the Omnivision reference
board tightly, as shown in Figure 4.
Figure 4. Cable Twist
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2.3 BOOSTXL-OV788ADAPT
The OV788 adapter booster pack is used to connect the CC3220-LAUNCHXL to the OV788 reference
board. This board provides voltage-level translation between the Launchpad, which operates at 3.3 V, and
the OV788, which operates at 1.85 V. The OV788 reference board is mounted on the camera adapter
board using the 12-pin 1.27-mm pitch headers. Connect the boards together as shown in Figure 5.
Figure 5. OV788 Adapter Booster Pack Connection
Hardware Setup
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2.4 Hardware Setup With LaunchPad Only
NOTE: For this setup, a wire must be connected to the 5-V supply on the CC3220 LaunchPad and
soldered to TP3 on the OV788 reference board to correctly supply power to it.
The adapter board does not supply 5-V power, as the connectors on the Omnivision board do not have a
line for 5 V.
Mount the adapter on the CC3220 LaunchPad, ensuring the VCC and GND pins are aligned, then mount
the OV788 board on the adapter, aligning the GND and power pins.
Set up the demo as shown in Figure 6.
Figure 6. CC3220 LaunchPad Setup
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2.5 Hardware Setup With RS232 Debug Board
Omnivision’s RS232 debug board is an optional board containing a UART to USB converter, used to get
UART debug information from the OV788. Connecting the RS232 debug board supplies 5 V power to the
Omnivision reference board. Mount the adapter on the CC3220 LaunchPad, ensuring the VCC and GND
pins are aligned, then mount the OV788 board on the adapter, aligning the GND and power pins. For this
setup, do not connect a wire for 5-V power from the CC3220 LaunchPad to the OV788 reference board,
as doing do may damage the components.
Set up the demo as shown in Figure 7.
Figure 7. RS232 Debug Board Setup
For this setup, ensure the ribbon cable orientation is correct. The Omnivision debug port has the following
settings:
• Bits per second: 115200
• Data bits: 8
• Parity: None
• Stop bits: 1
• Flow control: None
Running the Setup
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3 Running the Setup
Prerequisites:
• CC3220 SDK: http://www.ti.com/tool/SIMPLELINK-CC3220-SDK
• CC3220-OV788 Video Camera Application software: http://www.ti.com/wireless-connectivity/simplelink-
solutions/wi-fi/applications.html
• Uniflash 4.2 or greater: http://www.ti.com/tool/UNIFLASH
• RTP streaming client application, one of:
– VLC for Android, Ver. 3.0.0
– VLC for iOS, Ver. 2.8.7
– VLC for Windows, Ver. 2.2.8
• Wi-Fi Starter Pro application for iOS/Android
3.1 Programming the CC3220 LaunchPad
For the software to run correctly, the CC3220-LAUNCHXL must be programmed with a firmware binary file
for the OV788 and the latest service pack for the CC3220. Directions for programming are:
1. Under File, select Service Pack, and browse to the service pack in the most recent CC3220 SDK:
<CC3220 SDK>\tools\CC3220_tools\servicepack-cc3x20\
2. Add a new folder named user.
3. In the new user folder, add the file dsif_slave_9732.bin located in the folder <CC3220
SDK>\source\third_party\ov788\. Name this file ovt_firmware.bin, as shown in Figure 8.
Figure 8. Uniflash File System
4. To program the CC3220 binary:
a. Add the file <CC3220 SDK>\tools\CC3220_tools\certificate-playground\dummy-root-ca-cert. Note
use of "dummy" certificates is for development only.
b. Select Action, and Select MCU image as the CC3220 binary file located in <CC3220
SDK>\examples\rtos\CC3220S_LAUNCHXL\demos\video_streaming_ov788\freertos\iar\Debug\Exe
.
c. Use dummy-root-ca-cert as the certification file, and <CC3220
SDK>\tools\CC3220_tools\certificate-playground\dummy-root-ca-cert-key as the private key.
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5. Connect the CC3220 LaunchPad to the PC, and press Connect.
6. Press Generate Image , then Program Image.
3.2 Connecting the CC3220-OV788 Setup to the AP
The camera must first be provisioned an access point to enable streaming over a local network. Directions
for provisioning are:
1. Connect the CC3220 LaunchPad USB to the PC.
2. (Optional) Open the serial terminal to the COM port for the CC3220. The Omnivision debug port has
the following settings:
• Bits per second: 115200
• Data bits: 8
• Parity: None
• Stop bits: 1
• Flow control: None
Reset the CC3220 LaunchPad and Figure 9 shows in the terminal if the CC3220 is not able to connect
to an AP after 10 seconds:
Figure 9. Starting Provisioning
Running the Setup
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3. Start the Wi-Fi starter Pro application, and begin provisioning. See the Wi-Fi starter Pro manual for
details. Figure 10 illustrates the result of successful provisioning.
Figure 10. Successful Provisioning
4. If using the serial terminal, reset the board and note the IP address assigned to the camera after it
connects to the access point, as shown in Figure 11.
Figure 11. Camera IP Address
5. Alternatively, Bonjour for iOS™ or Bonjour Browser for Android™ can be used to discover the IP
address through MDNS device discovery, as shown in Figure 12 and Figure 13.
Figure 12. mDNS Device Discovery
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3.3 Streaming From the Client Application
3.3.1 VLC for Windows
1. Connect the PC to the same access point as the CC3220-OV788 setup.
2. Run VLC and choose Open Network Stream from the Media menu, as shown in Figure 14.
Figure 14. Open Network Stream
3. For the Network URL, enter ”rtsp://<local IP address>:8554/Video.264” and press Play, as shown in
Figure 15.
Figure 15. Enter Network URL
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3.3.2 VLC for iOS
1. Connect the iOS device to the same access point as the CC3220-OV788 setup.
2. Run VLC, and Choose Open Network Stream, as shown in Figure 16.
Figure 16. Open Network Stream
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3. For the Network URL, enter ”rtsp://<local IP address>:8554", as shown in Figure 17.
Figure 17. Enter Network URL
4. Press Open Network Stream.
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3.3.3 VLC for Android
NOTE: Having other audio applications open may prevent the audio from playing.
1. Connect the Android device to the same access point as the CC3220-OV788 setup.
2. Run VLC, and Choose Stream, as shown in Figure 18.
Figure 18. Choose Stream
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3. For the Network URL, enter ”RTSP://<local IP address>:8554", and press the yellow arrow, as shown
in Figure 19.
Figure 19. Enter Network URL
3.4 Results
The setup should now be streaming H.264 video from the camera setup to the streaming client. Adjust the
lens attached to the camera (by twisting) to get the best quality picture. The latency settings in the
streaming client can also be adjusted to reduce delay seen in the video stream. This setup serves as
starting point in software and hardware for developing many different types of end equipment which
stream video and audio over IP networks.
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