Diff: MMA7660FC.cpp

Revision:

0:cc40c3196635

Child:

1:513c1fefeede

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/MMA7660FC.cpp	Fri Sep 05 23:14:35 2014 +0000
@@ -0,0 +1,129 @@
+/*
+ * MMA7760.h
+ * Library for accelerometer_MMA7760
+ *
+ * Copyright (c) 2013 seeed technology inc.
+ * Author        :   FrankieChu
+ * Create Time   :   Jan 2013
+ * Change Log    :
+ *
+ * The MIT License (MIT)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "MMA7660.h"
+
+I2C i2c(I2C_SDA,I2C_SCL);
+
+/*Function: Write a byte to the register of the MMA7660*/
+void MMA7660::write(uint8_t _register, uint8_t _data)
+{
+    char data[2] = {_register,_data};
+    int check;
+    //Wire.begin();
+    //Wire.beginTransmission(MMA7660_ADDR);
+    //Wire.write(_register);
+    //Wire.write(_data);
+    //Wire.endTransmission();
+    check = i2c.write(MMA7660_ADDR<<1,data,2);
+    if(check != 0)
+        printf("I2C Write Failure\n\r");
+}
+/*Function: Read a byte from the regitster of the MMA7660*/
+uint8_t MMA7660::read(uint8_t _register)
+{
+    char data_read[2] = {_register,0};
+    int check;
+    check = i2c.write(MMA7660_ADDR<<1,data_read,1); // write _register to set up read
+    check = i2c.read(MMA7660_ADDR<<1,data_read,2); // execute read
+    if(check != 0)
+        printf("I2C Read failure\n\r");
+    printf("read back data 0x%x, 0x%x from register 0x%x",data_read[0],data_read[1],_register);
+    //uint8_t data_read;
+    //Wire.begin();
+    //Wire.beginTransmission(MMA7660_ADDR);
+    //Wire.write(_register);
+    //Wire.endTransmission();
+    //Wire.beginTransmission(MMA7660_ADDR);
+    //Wire.requestFrom(MMA7660_ADDR,1);
+    //while(Wire.available())
+    //{
+    //  data_read = Wire.read();
+    //}
+    //Wire.endTransmission();
+    return data_read[1];
+}
+
+void MMA7660::init()
+{
+    i2c.frequency(400000);
+    setMode(MMA7660_STAND_BY);
+    setSampleRate(AUTO_SLEEP_32);
+    setMode(MMA7660_ACTIVE);
+}
+void MMA7660::setMode(uint8_t mode)
+{
+    write(MMA7660_MODE,mode);
+}
+void MMA7660::setSampleRate(uint8_t rate)
+{
+    write(MMA7660_SR,rate);
+}
+/*Function: Get the contents of the registers in the MMA7660*/
+/*          so as to calculate the acceleration.            */
+void MMA7660::getXYZ(int8_t *x,int8_t *y,int8_t *z)
+{
+    char val[3];
+    int count = 0;
+    bool done = false;
+    val[0] = val[1] = val[2] = 64;
+//    while(Wire.available() > 0)
+//        Wire.read();
+//    Wire.requestFrom(MMA7660_ADDR,3);
+//    while(Wire.available())
+//    {
+//        if(count < 3)
+//        {
+//            while ( val[count] > 63 )  // reload the damn thing it is bad
+//            {
+//              val[count] = Wire.read();
+//            }
+//        }
+//        count++;
+//    }
+    for(count = 0; count < 3 && done == false; count ++){
+        i2c.read(MMA7660_ADDR<<1, val,3);
+        if(val[0] < 63 && val[1]<63 && val[2]<63)
+            done = true;
+    }
+    
+    *x = ((char)(val[0]<<2))/4;
+    *y = ((char)(val[1]<<2))/4;
+    *z = ((char)(val[2]<<2))/4;
+}
+
+void MMA7660::getAcceleration(float *ax,float *ay,float *az)
+{
+    int8_t x,y,z;
+    getXYZ(&x,&y,&z);
+    *ax = x/21.00;
+    *ay = y/21.00;
+    *az = z/21.00;
+}