| With the development of the mobile communication and improvement of the chip technology, the traditional mobile phones with simple phone function can not satisfy with the increasing demands of the multimedia applications. These phone solutions provide too less hardware capability, while some complete new solutions use complex technology and need long developing periods. Therefore, developing multimedia phones based on the mature GSM technology and mature multimedia processors is a good solution and common practice. In this paper, a mobile phone development platform of the approach is studied with Samsung's S32440, which is an advanced 16/32-bit RISC microprocessor and designed to provide a cost-effective, low power and high performance. With a built-in ARM920T core, the S32440 provides very good hardware performance and is enough for various smart mobile phone applications. In order to reduce system cost and offer high reliability, we choose Redhat's eCos as the embedded RTOS in our design. It is an open source, configurable, portable, and royalty-free. To meet the multimedia requirements, this paper studies the key technologies of S32440 and eCos; then designs the key function blocks of the hardware platform. In PCB design, signal integrity and other related issues are very important for reliability; they are studied and tested carefully in our design. This paper discusses the RTOS porting procedure; and studies the platform abstract layer, the variant abstract layer, and the architecture abstract layer. The initialization procedure of eCos is simply introduced at last. The eCos is very suitable for mobile phone for its cost-free and low hardware requirements. The paper is mainly on the schematics design, PCB design of the mother board, setup of the debugging environment and OS porting. Part of driver design and coding are also included. Finally, our design meets the requirements well and offers a reliable mobile phone development platform for multimedia applications. |
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