micro2440上挂接 AD7799的底层spi驱动代码，能够正确读出ad7799的转换值-AD7799 articulated micro2440 the bottom of the spi-driven code, can read out the correct conversion value ad7799

AD7799应用代码KeilC写的ADI的24位AD7799使用SPI接口程序(AD7799 application code KeilC ADI 24 bit AD7799 using SPI interface program)

AD7799 AD转换芯片，电压采集驱动程序。(AD7799 AD conversion chip, voltage acquisition driver.)