功能：arm7平台的I2c驱动程序，硬件I2C软件包，利用中断方式操作。 * 说明：主程序要配置好I2C总线接口(gpio、总线时钟)-Function: arm7 platform I2C driver, hardware I2C software packages, the use of interrupt operation.* Descr iption: main program should be configured I2C bus interface (gpio, bus cloc