Research Of Digital Audio Decoding System Based On ARM7

As rapid development of the embedded technology and the of digital audio technology,MP3 audio player in the embedded system implementation techniques have been widely used. The main task of this paper is to design a system for degital audio decoding based on ARM7.In the hardware,The paper take the low-power audio decoder RK2706B chip which based on ARM7 architecture as the system processor,to decode various audio files;With 1GB Nand Flash storage code and user documentation;Peripherals include a power management module,the MCU 18Bit 3.0-inch screen,backlight control IC,Power on-off / Lock key and other six ADC keys,TP (touch screen),power amplifier and headphone management IC,microphone,FM and RTC so. The processor and other chips communicate with I2C,SPI and other protocols.The software is based on embedded real-time operating system(RTOS) ucos-II core, supporting semaphores and message queues communication;supporting multi-tasking,multi-threading mechanism;supporting the FAT32 file system. The design focuses on the GUI of the implementation principle,Including the window system management mechanism,message and mission-driven mechanisms,different priority scheduling between tasks,the interface used in image and character resource management technology.Based on the structures of hardware architecture,software drivers,and GUI support,the software was debugded by ADS compiler tools,and then the final firmware generated was imported into to machine to achieve the digital audio decoder functionality with good user interface.