158 lines
4.4 KiB
C++
158 lines
4.4 KiB
C++
/* ### description ###
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Library file for using a DS1803 dual digital potentiometer with an arduino.
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please see 'README.txt' for more information
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Copyright (C) <2020> <Chris Nichols. github/return5>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef DS1803_H //guard against including the file more than once
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#define DS1803_H
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//-------------------------------------------- headers --------------------------------------------
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#include "Arduino.h" //give access to the arduino
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#include <Wire.h> //allow library to use the arduino's I2C functions
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//-------------------------------------------- define ---------------------------------------------
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#define WIPER_0 0xA9 //write to wiper one
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#define WIPER_1 0xAA //write to wiper two
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#define WIPER_BOTH 0xAF //write to both wipers at once
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//---------------------------------------------- enums ---------------------------------------------------
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//address of DS1803 based on the address lines A2,A1,A0.
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//A_000 == address of DS1803 when A2,A1,A0 are all 0.
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//A_101 is address of DS1803 when A2 = 1, A1 = 0, and A0 = 1.
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enum ADDRESS_LIST {A_000 = 0x28, A_001, A_010, A_011, A_100, A_101,A_110,A_111};
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//---------------------------------------------- typedefs ------------------------------------------------
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typedef enum ADDRESS_LIST ADDRESS;
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//-------------------------------------------- prototypes -----------------------------------------
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//function to set value of wiper. takes in address of device, which wiper to write to and the value to write to it.
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void setWiper(const ADDRESS address, const int wiper, const int value);
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//function which reads the current value for both wipers at given address and prints them to the serial monitor of the arduino
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void readWipers(const ADDRESS address, int *vals);//int vals[2]
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//function which starts serial communications and starts i2c communication with potentiometer
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void initDS1803();
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class PotenciometroI2C
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{
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float corte;
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ADDRESS id;
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public:
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PotenciometroI2C()
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{
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corte=20;
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id=A_000;
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}
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void Configura(int _addres, float _corte=20)
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{
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corte=20;
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switch (_addres)
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{
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case 0:
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id=A_000;
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break;
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case 1:
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id=A_001;
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break;
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case 2:
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id=A_010;
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break;
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case 3:
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id=A_011;
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break;
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case 4:
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id=A_100;
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break;
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case 5:
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id=A_101;
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break;
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case 6:
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id=A_110;
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break;
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case 7:
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id=A_111;
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break;
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default:
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id=A_000;
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break;
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}
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}
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int getvi()
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{
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int vals[2];
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readWipers(id, vals);
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int vmax = vals[0];
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int valor = (int)((vmax)*100. / 255 + 0.5);
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valor = (int)getEscala(valor);
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return valor;
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}
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void setv(int vol)
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{
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vol = setEscala(vol);
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//vol=101-vol;//se invierte
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vol = vol;
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vol = (2.55 * (vol));
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if (vol > 255)
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vol = 255;
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setWiper(id, WIPER_0, vol);
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setWiper(id, WIPER_1, vol);
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}
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private:
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float setEscala(float i) {
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float corte_max = 100 - corte;
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Serial.print("setEscala to ");
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Serial.print(i);
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float res = i;
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if (i < corte) {
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res = i * (corte_max + 1) / corte;
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} else {
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res = corte_max + 1 + ((i - corte) * corte / (corte_max));
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}
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Serial.print(" set escala out: ");
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Serial.println(res);
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Serial.print(" get: ");
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Serial.println(getEscala(res));
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return res;
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}
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float getEscala(float i) {
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float corte_max = 100 - corte;
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float res = i;
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if (i < corte_max) {
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res = i * (corte) / corte_max;
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} else {
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res = corte + ((i - corte_max) * corte_max / corte);
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}
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return res;
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}
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};
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#endif
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