Diff: acc.cpp

Revision:

0:1abea3982908

Child:

1:ba0f395e8c11

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/acc.cpp	Wed Jan 25 00:07:44 2017 +0000
@@ -0,0 +1,69 @@
+#include "acc.h"
+#include "mbed.h"
+
+extern I2C connection;
+//extern DigitalOut led1;
+//extern DigitalOut led2;
+//extern Serial pc;
+
+void acc_init(float duration, float threshold, float gap, float window){
+    //acc = &connection;
+    char durationByte, thresholdByte, gapByte, windowByte; 
+    
+    //convert the function parameters from their respective units to the appropriate byte values
+    durationByte = duration / 0.625;
+    thresholdByte = threshold / 0.00625;
+    gapByte = gap / 1.25;
+    windowByte = window / 1.25;
+    
+    //set the config constants
+    char acc_config_dataFormat[2] = {0x31,0x0b}; //measurement range
+    char acc_config_powerControl[2] = {0x2d,0x08};
+    char acc_config_tapThreshold[2] = {0x1d,thresholdByte};
+    char acc_config_tapDuration[2] = {0x21,durationByte};
+    char acc_config_latentGap[2] = {0x22,gapByte};
+    char acc_config_window[2] = {0x23,windowByte};
+    char acc_config_enableAxis[2] = {0x2a,0x07};
+    char acc_config_intEnable[2] = {0x2e,0x60};
+    char acc_config_intMap[2] = {0x2f,0x60};
+    
+    //set the configuration
+    connection.write(addr_acc, acc_config_dataFormat, 2); //full measurement range
+    wait(.05);
+    connection.write(addr_acc, acc_config_tapDuration, 2);
+    wait(.05);
+    connection.write(addr_acc, acc_config_tapThreshold, 2);
+    wait(.05);
+    connection.write(addr_acc, acc_config_latentGap, 2);
+    wait(.05);
+    connection.write(addr_acc, acc_config_window, 2);
+    wait(.05);
+    connection.write(addr_acc, acc_config_enableAxis, 2);
+    wait(.05); 
+    connection.write(addr_acc, acc_config_intEnable, 2);
+    wait(.05);
+    connection.write(addr_acc, acc_config_intMap, 2);
+    wait(.05);
+     connection.write(addr_acc, acc_config_powerControl, 2); // measure mode
+    wait(.05);
+    //flash some LEDs as a debug tool confirming that init has been run
+    /*led1 = 1;
+    led2 = 1;
+    wait(0.2);
+    led1 = 0;
+    led2 = 0;*/
+}
+
+char get_int_type(){
+    char int_source_arr[2] = {0x30|0x80, 0x00};
+    connection.write(addr_acc, int_source_arr, 1); //set up the connection for reading from int_source
+    char acc_data[1];
+    connection.read(addr_acc, acc_data, 1); //read the int_source byte
+    //pc.printf("%x\t",acc_data[0]&0x60); //this was used for debugging
+    if(acc_data[0] & 0x20) //if a double tap, return 2
+        return 2;
+    else if (acc_data[0] & 0x40) //if a single tap, return 1
+        return 1;
+    //this code should never be reached, but is included so that there is an appropriate exit path   
+    return 0;
+}
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