added analog() function to support AD7998 8-channel 12-bit A/D converter
added analog() function to support AD7998 8-channel 12-bit A/D converter



git-svn-id: 1b2893900746d3474b20c0dea7456040123c3b26@226 21eae674-98b7-11dd-bd71-f92a316d2d60

jpoirier/picoc