Darrel Weng / MMA8451Q

My version of the library for this accelerometer. It works on 800Hz data rate.

Fork of MMA8451Q by Antonio Quevedo

Files at this revision

API Documentation at this revision

Revision 1:9c229882cd2b, committed 2017-07-18

Comitter:
DWeng
Date:
Tue Jul 18 18:34:24 2017 +0000
Parent:
0:7c9ab58f6af3
Commit message:
initial commit.

Changed in this revision

MMA8451Q.cpp Show annotated file Show diff for this revision Revisions of this file 
--- a/MMA8451Q.cpp	Wed Jun 04 19:16:47 2014 +0000
+++ b/MMA8451Q.cpp	Tue Jul 18 18:34:24 2017 +0000
@@ -36,9 +36,10 @@
     uint8_t data[2] = {REG_CTRL_REG1, 0x00}; // Puts acc in standby for configuring
     writeRegs(data, 2);
     data[0] = REG_XYZ_DATA_CFG; // Writing 00 turns off high-pass filter and sets full scale range to 2g
-    // data[1] = 0x01; for 4g
-    // data[1] = 0x02; for 8g
-    writeRegs(data, 2);
+                                // data[1] = 0x01; for 4g
+                                // data[1] = 0x02; for 8g
+    data[1] = 0x00;
+    writeRegs(data, 2); 
     data[0] = REG_CTRL_REG2;
     data[1] = 0x00; // Disable self-test, software reset and auto-sleep; operates in normal mode
     writeRegs(data, 2);
@@ -50,7 +51,7 @@
     data[0] = REG_CTRL_REG5;
     writeRegs(data, 2); // Routes Data Ready interrupt to INT1
     data[0] = REG_CTRL_REG1; 
-    data[1] = 0x09; // Data rate is 800Hz
+    data[1] = 0x09; // Data rate is 400Hz
     writeRegs(data, 2);
 }
 
@@ -59,9 +60,9 @@
 void MMA8451Q::getAccAllAxis(int16_t * res) {
     uint8_t temp[6];
     readRegs(REG_OUT_X_MSB, temp, 6);
-    res[0] = (temp[0] * 256) + temp[1];
-    res[1] = (temp[2] * 256) + temp[3];
-    res[2] = (temp[4] * 256) + temp[5];
+    res[0] = ((temp[0] << 8) + temp[1]);
+    res[1] = ((temp[2] << 8) + temp[3]);
+    res[2] = ((temp[4] << 8) + temp[5]);
 }
 
 void MMA8451Q::readRegs(int addr, uint8_t * data, int len) {