Load cell amplifier interface
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hx711.cpp
00001 /* mbed library for HX711 Load Cell Amplifier/24-bit A/D converter 00002 * Copyright (c) 2015 Jim Conner 00003 * 00004 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 00005 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 00006 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 00007 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 00008 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 00009 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 00010 * THE SOFTWARE. 00011 */ 00012 00013 #include "hx711.h" 00014 #include "mbed.h" 00015 00016 //#define BPP 16 // Bits per pixel 00017 00018 // Constructor 00019 HX711::HX711(PinName clk, PinName addo) : clk(clk), addo(addo) 00020 { 00021 00022 00023 } 00024 00025 // Destructor 00026 HX711::~HX711(void) {} 00027 00028 00029 // Reading data from the converter 00030 long HX711::readData(void) 00031 { 00032 unsigned char i; 00033 unsigned long Count; 00034 clk=0; 00035 Count=0; 00036 while(addo); 00037 for (i=0;i<24;i++) { 00038 clk=1; 00039 Count=Count<<1; 00040 clk=0; 00041 if(addo) Count++; 00042 } 00043 clk=1; 00044 Count=Count ^0x800000; 00045 clk=0; 00046 return(Count); 00047 } 00048
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