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The return of the encoder test
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‎extras/encoder_test/encoder_test.ino

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// What input is associated with each control?
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#define CTRL_SEL A2 //main select button - must be equipped
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#define CTRL_UP A1 //main up/down buttons or rotary encoder - must be equipped
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#define CTRL_DN A0
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#define ROT_VEL_START 80 //if encoder step rate falls below this, kick into high velocity set (x10)
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#define ROT_VEL_STOP 500 //if encoder step rate rises above this, drop into low velocity set (x1)
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//This clock is 2x3 multiplexed: two tubes powered at a time.
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//The anode channel determines which two tubes are powered,
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//and the two SN74141 cathode driver chips determine which digits are lit.
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//4 pins out to each SN74141, representing a binary number with values [1,2,4,8]
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#define OUT_A1 2
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#define OUT_A2 3
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#define OUT_A3 4
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#define OUT_A4 5
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#define OUT_B1 6
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#define OUT_B2 7
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#define OUT_B3 8
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#define OUT_B4 9
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//3 pins out to anode channel switches
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#define ANODE_1 11
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#define ANODE_2 12
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#define ANODE_3 13
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#include <Wire.h>
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#include <Encoder.h>
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Encoder rot(CTRL_DN,CTRL_UP);
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byte theVal = 0;
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////////// Main code control //////////
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void setup(){
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Serial.begin(9600);
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Wire.begin();
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initInputs();
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initOutputs();
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updateDisplay();
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}
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void loop(){
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checkInputs(); //if inputs have changed, this will do things + updateDisplay as needed
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cycleDisplay(); //keeps the display hardware multiplexing cycle going
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//TODO why isn't the display working
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}
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////////// Control inputs //////////
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void initInputs(){
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//TODO are there no "loose" pins left floating after this? per https://electronics.stackexchange.com/q/37696/151805
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pinMode(CTRL_SEL, INPUT_PULLUP);
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pinMode(CTRL_UP, INPUT_PULLUP);
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pinMode(CTRL_DN, INPUT_PULLUP);
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}
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void checkInputs(){
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checkRot();
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}
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bool rotVel = 0; //high velocity setting (x10 rather than x1)
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unsigned long rotLastStep = 0; //timestamp of last completed step (detent)
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int rotLastVal = 0;
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void checkRot(){
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int rotCurVal = rot.read();
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if(rotCurVal!=rotLastVal){ //we've sensed a state change
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rotLastVal = rotCurVal;
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Serial.println(rotCurVal,DEC);
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if(rotCurVal>=4 || rotCurVal<=-4){ //we've completed a step of 4 states (this library doesn't seem to drop states much, so this is reasonably reliable)
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unsigned long now = millis();
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if((unsigned long)(now-rotLastStep)<=ROT_VEL_START) rotVel = 1; //kick into high velocity setting (x10)
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else if((unsigned long)(now-rotLastStep)>=ROT_VEL_STOP) rotVel = 0; //fall into low velocity setting (x1)
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rotLastStep = now;
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while(rotCurVal>=4) { rotCurVal-=4; theVal+=1; }
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while(rotCurVal<=-4) { rotCurVal+=4; theVal-=1; }
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rot.write(rotCurVal);
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updateDisplay();
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}
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}
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} //end checkRot()
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////////// Display data formatting //////////
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byte displayNext[6] = {15,15,15,15,15,15};
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byte displayLast[6] = {15,15,15,15,15,15};
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void updateDisplay(){
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Serial.print(F("---")); Serial.print(theVal,DEC); if(rotVel) Serial.print(F("!")); Serial.println();
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editDisplay(theVal,0,3,false,false);
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blankDisplay(4,5,false);
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}
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void editDisplay(word n, byte posStart, byte posEnd, bool leadingZeros, bool fade){
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//Splits n into digits, sets them into displayNext in places posSt-posEnd (inclusive), with or without leading zeros
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//If there are blank places (on the left of a non-leading-zero number), uses value 15 to blank tube
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//If number has more places than posEnd-posStart, the higher places are truncated off (e.g. 10015 on 4 tubes --> 0015)
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word place;
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for(byte i=0; i<=posEnd-posStart; i++){
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switch(i){ //because int(pow(10,1))==10 but int(pow(10,2))==99...
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case 0: place=1; break;
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case 1: place=10; break;
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case 2: place=100; break;
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case 3: place=1000; break;
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case 4: place=10000; break;
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case 5: place=100000; break;
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default: break;
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}
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displayNext[posEnd-i] = (i==0&&n==0 ? 0 : (n>=place ? (n/place)%10 : (leadingZeros?0:15)));
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if(!fade) displayLast[posEnd-i] = displayNext[posEnd-i]; //cycleDisplay will be none the wiser
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}
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} //end editDisplay()
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void blankDisplay(byte posStart, byte posEnd, byte fade){
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for(byte i=posStart; i<=posEnd; i++) { displayNext[i]=15; if(!fade) displayLast[i]=15; }
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} //end blankDisplay();
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////////// Hardware outputs //////////
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byte binOutA[4] = {OUT_A1,OUT_A2,OUT_A3,OUT_A4};
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byte binOutB[4] = {OUT_B1,OUT_B2,OUT_B3,OUT_B4};
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byte anodes[3] = {ANODE_1,ANODE_2,ANODE_3};
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const int fadeLastDur = 5;
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const int fadeNextDur = 0;
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void initOutputs() {
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for(byte i=0; i<4; i++) { pinMode(binOutA[i],OUTPUT); pinMode(binOutB[i],OUTPUT); }
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for(byte i=0; i<3; i++) { pinMode(anodes[i],OUTPUT); }
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}
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void cycleDisplay(){
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//Anode channel 0: tubes #2 (min x10) and #5 (sec x1)
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setCathodes(displayLast[2],displayLast[5]); //Via d2b decoder chip, set cathodes to old digits
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digitalWrite(anodes[0], HIGH); //Turn on tubes
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delay(fadeLastDur); //Display for fade-out cycles
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setCathodes(displayNext[2],displayNext[5]); //Switch cathodes to new digits
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delay(fadeNextDur); //Display for fade-in cycles
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digitalWrite(anodes[0], LOW); //Turn off tubes
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//Anode channel 1: tubes #4 (sec x10) and #1 (hour x1)
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setCathodes(displayLast[4],displayLast[1]);
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digitalWrite(anodes[1], HIGH);
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delay(fadeLastDur);
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setCathodes(displayNext[4],displayNext[1]);
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delay(fadeNextDur);
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digitalWrite(anodes[1], LOW);
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//Anode channel 2: tubes #0 (hour x10) and #3 (min x1)
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setCathodes(displayLast[0],displayLast[3]);
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digitalWrite(anodes[2], HIGH);
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delay(fadeLastDur);
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setCathodes(displayNext[0],displayNext[3]);
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delay(fadeNextDur);
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digitalWrite(anodes[2], LOW);
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} //end cycleDisplay()
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void setCathodes(byte decValA, byte decValB){
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bool binVal[4]; //4-bit binary number with values [1,2,4,8]
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decToBin(binVal,decValA); //have binary value of decVal set into binVal
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for(byte i=0; i<4; i++) digitalWrite(binOutA[i],binVal[i]); //set bin inputs of SN74141
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decToBin(binVal,decValB);
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for(byte i=0; i<4; i++) digitalWrite(binOutB[i],binVal[i]); //set bin inputs of SN74141
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} //end setCathodes()
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void decToBin(bool binVal[], byte i){
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//binVal is a reference (modify in place) of a binary number bool[4] with values [1,2,4,8]
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if(i<0 || i>15) i=15; //default value, turns tubes off
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binVal[3] = int(i/8)%2;
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binVal[2] = int(i/4)%2;
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binVal[1] = int(i/2)%2;
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binVal[0] = i%2;
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} //end decToBin()

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