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149 lines
4.1 KiB
C++
149 lines
4.1 KiB
C++
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/*
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*
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* Author: Rafael da Mata Neri <rafael.neri@gmail.com>
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* Copyright (c) 2015 Intel Corporation.
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*
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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* the Software, and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <iostream>
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#include <fstream>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include "hx711.h"
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using namespace upm;
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using namespace std;
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struct HX711Exception : public std::exception {
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std::string message;
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HX711Exception (std::string msg) : message (msg) { }
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~HX711Exception () throw () { }
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const char* what() const throw () { return message.c_str(); }
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};
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HX711::HX711(uint8_t data, uint8_t sck, uint8_t gain) {
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mraa_result_t error = MRAA_SUCCESS;
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this->m_dataPinCtx = mraa_gpio_init(data);
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if (this->m_dataPinCtx == NULL) {
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throw HX711Exception ("Couldn't initilize DATA pin.");
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}
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this->m_sckPinCtx = mraa_gpio_init(sck);
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if (this->m_sckPinCtx == NULL) {
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throw HX711Exception ("Couldn't initilize CLOCK pin.");
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}
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error = mraa_gpio_dir (this->m_dataPinCtx, MRAA_GPIO_IN);
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if (error != MRAA_SUCCESS) {
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throw HX711Exception ("Couldn't set direction for DATA pin.");
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}
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error = mraa_gpio_dir (this->m_sckPinCtx, MRAA_GPIO_OUT);
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if (error != MRAA_SUCCESS) {
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throw HX711Exception ("Couldn't set direction for CLOCK pin.");
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}
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this->setGain(gain);
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}
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HX711::~HX711() {
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mraa_result_t error = MRAA_SUCCESS;
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error = mraa_gpio_close (this->m_dataPinCtx);
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if (error != MRAA_SUCCESS) {
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mraa_result_print(error);
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}
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error = mraa_gpio_close (this->m_sckPinCtx);
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if (error != MRAA_SUCCESS) {
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mraa_result_print(error);
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}
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}
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unsigned long HX711::read() {
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unsigned long Count = 0;
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while (mraa_gpio_read(this->m_dataPinCtx));
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for (int i=0; i<GAIN; i++)
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{
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mraa_gpio_write(this->m_sckPinCtx, 1);
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Count = Count << 1;
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mraa_gpio_write(this->m_sckPinCtx, 0);
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if(mraa_gpio_read(this->m_dataPinCtx))
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{
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Count++;
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}
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}
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mraa_gpio_write(this->m_sckPinCtx, 1);
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Count = Count ^ 0x800000;
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mraa_gpio_write(this->m_sckPinCtx, 0);
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return (Count);
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}
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void HX711::setGain(uint8_t gain){
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switch (gain) {
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case 128: // channel A, gain factor 128
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GAIN = 24;
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break;
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case 64: // channel A, gain factor 64
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GAIN = 26;
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break;
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case 32: // channel B, gain factor 32
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GAIN = 25;
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break;
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}
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mraa_gpio_write(this->m_sckPinCtx, 0);
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read();
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}
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unsigned long HX711::readAverage(uint8_t times){
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unsigned long sum = 0;
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for (uint8_t i = 0; i < times; i++) {
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sum += read();
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}
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return sum / times;
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}
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double HX711::getValue(uint8_t times){
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return readAverage(times) - OFFSET;
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}
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float HX711::getUnits(uint8_t times){
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return getValue(times) / SCALE;
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}
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void HX711::tare(uint8_t times){
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double sum = readAverage(times);
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setOffset(sum);
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}
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void HX711::setScale(float scale){
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SCALE = scale;
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}
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void HX711::setOffset(long offset){
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OFFSET = offset;
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}
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