AD5242驱动程序，可分别控制两个通道递增。K1设定初始值，K2选择控制的通道，K3控制该通道增加，K4控制该通道减少。-AD5242 driver can control two-channel increments. Set the initial value K1, K2 control channel, K3 control of the channel increases, K4 controls the channel is reduced.