introduction
In-vehicle infotainment consumers may think that in-vehicle network access is an emerging feature that only means Internet access. Our concept is also rapidly updated. Few people think that CAN communication is a high-tech term, but in infotainment systems, CAN and other internal connection protocols (such as MOST, Ethernet, and USB) form an important backbone network that makes many of today's key vehicles The function is achieved. Bluetooth technology was once defined as a vehicle "wireless" connection technology. Now, people have expanded its definition to include smart phone network sharing, in-vehicle Wi-Fi® access points, shop floor communications, near field communication (NFC), and more.
Over the past 10 years, TI and QNX Software Systems have worked closely together to bring us many innovative in-vehicle infotainment connectivity solutions. Even though it was replaced by some of the systems used in today's car, many of these systems were groundbreaking at the time. This article will delve into the improvements and innovations that drive the development of these systems and look ahead to their future development. Innovation can be achieved not only through the use of new in-vehicle systems and in-vehicle electronic components, but also through some “less eye-catching†but crucial methods (eg reducing system cost, size and power consumption). Achieve innovation. In addition, we will discuss access technologies from both in-vehicle and external devices.
The picture shows the specially modified Jeep Wrangler inside the QNX benchmark car console
OMAP1 processor Bluetooth technology and compressed audio
After the launch of the OMAP1 processor in 2002, TI announced a single-chip automotive device family that delivers a rich multimedia experience (CD-DA and CD-ROM/DVD-ROM/USB/SD, supporting MP3, WMA and AAC audio decoding) Device). These devices also provide connectivity for phones that use early Bluetooth technology for hands-free calling in the car. These solutions are still in volume shipments until 2012, when they are providing consumers with a feature-rich entry-level infotainment experience. Together with QNX Software Systems, Texas Instruments brings a number of key innovations to the OMAP1 processor, including the integration of multimedia capabilities and an application-based processor into a single on-chip system (SOC). This solution leverages TI's C55x digital signal processor (DSP) to speed up the audio codec and processing, while using ARM's ARM926 general purpose processor and the DSP's simple API to coordinate communications.
Figure 1: Simplified OMAP1 processor block diagram
Jacinto 1-DDR Enhanced Multimedia and Software Defined Radio
After the introduction of five OMAP1 processor versions, TI released the Jacinto 1 family of devices in 2006. This new family of devices brings a major leap to infotainment integration. Compared to the OMAP1 series, the Jacinto 1 series has a lower cost point for more features such as: playing compressed video from DVD or local USB/SD storage, Bluetooth A2DP audio streaming support for Apple iPod®, and digital radio baseband Demodulation (DAB in Europe and HD RadioTM in the US). In addition, the Jacinto 1-DDR device can drive two HD color displays for user interface or video playback, giving OEMs greater flexibility in displaying on-screen information. The Jacinto 1 device also replaces the C55x DSP with a powerful TI C64x+ fixed-point DSP. The high performance of the C64x+ DSP supports simultaneous graphics acceleration, compressed audio decoding, speech recognition and radio demodulation. This parallel operation feature greatly expands the functionality of a single isolated ARM CPU.
Another important innovation realized by TI and QNX Software Systems in the Jacinto 1 device is the DSP Link Interprocessor Communication (IPC) component. This link connects the ARM CPU to the DSP and uses DSP to accelerate zero-overhead control of the application and peripherals. The DSP Link IPC software is a significant development of the OMAP 1 processor for the brother product of the Jacinto 1 processor. The range of software mechanisms for DSP links has been extended to support several completely different information transmission technologies. In addition, it allows some very different functions to be implemented simultaneously on the DSP, such as audio codec, graphics acceleration and radio demodulation, while allowing ARM software to seamlessly and low-latency these functions through user applications. control.
The Jacinto 1 processor also allows hardware to schedule and process video from external sources, such as cameras and DVDs, for direct output to the display. Some previous architectures can only arrange or multiplex video resources through a user interface through software algorithms or using separate hardware devices. Using software to display the user interface with the camera or video overlay, set transparency, or perform color space operations can greatly increase software processing overhead and increase bill of materials (BOM) costs for individual hardware devices. The Jacinto 1 device eliminates the need for both solutions by implementing graphics processing through hardware functions such as color space conversion or transparent blending. This advantage frees the ARM CPU from heavy graphics processing and allows it to be used to implement more software functions for OEM differentiation.
QNX Software Systems contributed the software infrastructure components to the Jacinto 1 system, supporting the many features of the device. For example, use a multimedia framework for DSP codecs linked via DSP, and integrate DSP-accelerated graphics capabilities from third-party companies into the QNX software system OpenGL® ES drive.
Figure 2: TI Jacinto 1-DDR processor diagram
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