AD7799的驱动程序，已在51单片机上实验通过，此驱动程序是针对自身带SPI接口的单片机，对于不带SPI接口的，可参考网上挂出的驱动。,AD7799 driver has been in MCS-51 on the test passed, this driver is for the self-SPI interface with a microcontroller, for non-SPI interface can be found online hung out the driver.

/* basic driver for ad7798 and ad7799, not all functions supported assumes a spi driver exists, and "spi_transfer" takes and returns a byte. */-/* basic driver for ad7798 and ad7799, not all functions supported assumes a spi driver exists,