CD74HC4067 library ported for mbed.
Diff: CD74HC4067.cpp
- Revision:
- 0:7f158d69af5e
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/CD74HC4067.cpp Sat Jan 20 10:52:09 2018 +0000 @@ -0,0 +1,61 @@ +//CD74HC4067 Library based on bildr code: "http://bildr.org/2011/02/cd74hc4067-arduino/" +//Ported to mbed by Scott M. O'Hair + +#include "CD74HC4067.h" +#include "mbed.h" + + +CD74HC4067::CD74HC4067(PinName S1, PinName S2, PinName S3, PinName S4, PinName SIG) : _S0(S1), _S1(S2), _S2(S3), _S3(S4), _SIG(SIG) +{ + //initialize port state to zero + for (uint8_t i = 0; i < 15; i++) { + portState[i] = 0.0; + } + + //pull all pins low + _S0 = 0; + _S1 = 0; + _S2 = 0; + _S3 = 0; + +} + +void CD74HC4067::saveState(uint8_t port, float state) +{ + this->portState[port] = state; +} + +float CD74HC4067::readMux(uint8_t channel) +{ + DigitalOut controlPin[] = {_S0, _S1, _S2, _S3}; + + uint8_t muxChannel[16][4]= { + {0,0,0,0}, //channel 0 + {1,0,0,0}, //channel 1 + {0,1,0,0}, //channel 2 + {1,1,0,0}, //channel 3 + {0,0,1,0}, //channel 4 + {1,0,1,0}, //channel 5 + {0,1,1,0}, //channel 6 + {1,1,1,0}, //channel 7 + {0,0,0,1}, //channel 8 + {1,0,0,1}, //channel 9 + {0,1,0,1}, //channel 10 + {1,1,0,1}, //channel 11 + {0,0,1,1}, //channel 12 + {1,0,1,1}, //channel 13 + {0,1,1,1}, //channel 14 + {1,1,1,1} //channel 15 + }; + + //loop through the 4 sig + for(uint8_t i = 0; i < 4; i++) { + controlPin[i] = muxChannel[channel][i]; + } + + //read the value at the SIG pin + float val = _SIG.read(); + + //return the value + return val; +}