MCP23009 is a general IO I2C chip . This lib provide higher level interface ( set pin value, set io modes etc ) without need to have knowledge of the I2C registers
History
added more functions , tested with hardware using n FRDM_KL05Z)
2016-06-03, by wbeaumont [Fri, 03 Jun 2016 16:01:45 +0000] rev 1
added more functions , tested with hardware using n FRDM_KL05Z)
initial version not tested with hw
2016-06-03, by wbeaumont [Fri, 03 Jun 2016 12:40:49 +0000] rev 0
initial version not tested with hw