Diff: HX711.cpp

Revision:

0:f82840dd806a

Child:

1:9ba152cc4f67

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/HX711.cpp	Fri Jun 12 16:05:39 2015 +0000
@@ -0,0 +1,155 @@
+/*
+ * FILE: HX711.cpp
+ * 
+ * VERSION: 0.1
+ * PURPOSE: HX711 weight library for Nucleo STM32
+ * AUTHOR: Bertrand Bouvier
+ * LICENSE: GPL v3 (http://www.gnu.org/licenses/gpl.html)
+ *
+ * DATASHEET: http://www.dfrobot.com/image/data/SEN0160/hx711_english.pdf
+ * URL: 
+ *
+ * HISTORY:
+ * 24/05/2015 - Bertrand Bouvier - Original version
+ * see HX711.h
+ *
+ * SPECIAL THANKS:
+ *  Inspiré du travail de Weihong Guan (@aguegu)
+ *  https://github.com/aguegu/Arduino
+ *  http://aguegu.net
+ *  
+ *  Inspiré du travail de bodge
+ *  https://github.com/bogde/HX711
+ *
+ */
+ 
+#include "HX711.h"
+#include "mbed.h"
+
+#define SCALE_VALUE 259.79 //multiple propre à chaque hardware
+
+HX711::HX711(PinName pinData, PinName pinSck, uint8_t gain)
+{
+    _pinData = pinData;
+    _pinSck = pinSck;
+    
+    this->setGain(gain);
+    
+    DigitalOut sck(_pinSck);
+    DigitalIn data(_pinData);
+    
+    sck = 1;        //Initialisation HX711
+    wait_us(100);
+    sck = 0;
+    
+    this->setOffset(averageValue(10)); //TARE de la balance
+    this->setScale(SCALE_VALUE);        //Réglage du valeur du SCALE
+}
+
+HX711::~HX711()
+{
+
+}
+
+int HX711::averageValue(uint8_t times) //Calcule une moyenne sur plusieurs mesures 
+{
+    int sum = 0;
+    for (int i = 0; i < times; i++)
+    {
+        sum += getValue();
+    }
+
+    return sum / times;
+}
+
+int HX711::getValue() //Obtenir la valeur brut du controller
+{
+    int buffer; 
+    buffer = 0 ;
+    
+    DigitalOut sck(_pinSck);
+    DigitalIn data(_pinData);
+    
+    while (data.read()==1) //wait is ready
+    ;
+    
+    for (uint8_t i = 24; i--;) //read 24 bit 1 per 1 and save to buffer
+    {
+        sck=1;
+
+        buffer = buffer << 1 ;
+    
+        if (data.read())
+        {
+            buffer ++;
+        }
+        
+        sck=0;
+    }
+    
+    for (int i = 0; i < _gain; i++)
+    {
+        sck=1; 
+        sck=0;
+    }
+    
+    buffer = buffer ^ 0x800000;
+
+    return buffer;
+}
+
+void HX711::setOffset(int offset)
+{
+    _offset = offset;
+}
+
+void HX711::setScale(float scale)
+{
+    _scale = scale;
+}
+
+float HX711::getGram()
+{
+    long val = (averageValue(2) - _offset);
+    return (float) val / _scale;
+}
+
+void HX711::setGain(uint8_t  gain) 
+{
+    switch (gain) 
+    { 
+        case 128:       // channel A, gain factor 128 
+            _gain = 1; 
+            break; 
+            
+        case 64:        // channel A, gain factor 64 
+            _gain = 3; 
+            break; 
+            
+        case 32:        // channel B, gain factor 32 
+            _gain = 2; 
+            break; 
+    } 
+    DigitalOut sck(_pinSck);
+    sck = 0;
+    getValue();
+}
+
+void HX711::powerDown() 
+{
+    DigitalOut sck(_pinSck);
+    sck = 0;
+    sck = 1;
+}
+
+void HX711::powerUp() 
+{
+    DigitalOut sck(_pinSck);
+    sck = 0;
+}
+
+void HX711::tare(uint8_t times) 
+{
+    int sum = averageValue(times);
+    setOffset(sum);
+}
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