Diff: Hx711.cpp

Revision:

0:52c805a049c4

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Hx711.cpp	Sun Feb 21 11:01:00 2016 +0000
@@ -0,0 +1,102 @@
+#include "Hx711.h"
+
+HX711::HX711(PinName pin_dout, PinName pin_slk): _pin_dout(pin_dout), _pin_slk(pin_slk)
+{
+    _pin_slk = 1;
+    wait_ms(100);
+    _pin_slk = 0;
+    
+    set_gain(128);
+}
+
+HX711::~HX711()
+{
+
+}
+
+
+void HX711::set_gain(char 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;
+    }
+    _pin_slk = 0;
+    read();
+}
+
+long HX711::read()
+{
+    long value = 0;
+
+    while (_pin_dout)
+        ;
+
+    for (int i=0;i<24;i++)
+    { 
+        _pin_slk = 1;
+        value=value<<1; 
+        _pin_slk = 0;
+        if(_pin_dout) value++; 
+    } 
+
+    _pin_slk = 1;
+    _pin_slk = 0;
+
+    value=value^0x800000;
+
+    return value;
+}
+
+long HX711::read_average(char times)
+{
+    long sum = 0;
+    for (char i = 0; i < times; i++) {
+        sum += read();
+    }
+    return sum / times;
+}
+
+double HX711::get_value(char times)
+{
+    return read_average(times) - OFFSET;
+}
+
+float HX711::get_units(char times)
+{
+    return get_value(times) / SCALE;
+}
+
+void HX711::tare(char times)
+{
+    double sum = read_average(times);
+    set_offset(sum);
+}
+
+void HX711::set_scale(float scale)
+{
+    SCALE = scale;
+}
+
+void HX711::set_offset(long offset)
+{
+    OFFSET = offset;
+}
+
+void HX711::power_down()
+{
+  _pin_slk = 0;
+  _pin_slk = 1;
+}
+
+void HX711::power_up()
+{
+  _pin_slk = 0;
+}
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