Revision 0:1ad0940e9494, committed 2019-01-16

Comitter:

jschilling22

Date:

Wed Jan 16 07:03:19 2019 +0000

Commit message:

Final Product;

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed Jan 16 07:03:19 2019 +0000
@@ -0,0 +1,105 @@
+/* Jason Schilling
+jschilling22@my.whitworth.edu
+1/15/18
+Mini Project 6
+This program senses one or two taps in sucession and turns on an led if it was one or two taps.
+*/
+#include <mbed.h>
+
+DigitalOut ss(p14);
+SPI acc(p11, p12, p13);  //MOSI, MISO, and SCK
+void tapsHappened(void);
+DigitalOut led1(LED1);
+DigitalOut led2(LED2);
+DigitalOut led4(LED4);
+InterruptIn tapInterrupt(p5);
+Timeout singleTimeout;
+Timeout doubleTimeout;
+void singleOff(void);
+void doubleOff(void);
+
+int main() {
+    ss = 1; // turns off the accelerometer(ADXL345) while setting format and frequency
+    acc.format(8,3); // 8 bit words, mode 3
+    acc.frequency(2000000); // 2 MHz clock
+    // the ADXL345 is turned on for each transmission (and off after each transmission) to adjust its settings
+    /* for all of the setting adjustments, the first line is the address of the register.
+    The second line adjusts the setting to the desired value */
+    ss = 0; 
+    acc.write(0x1D); // sets tap threshold to 5g
+    acc.write(80);
+    ss = 1;
+    
+    ss = 0;
+    acc.write(0x21); // sets tap duration to
+    acc.write(0x10);    // 10 ms
+    ss = 1;
+
+    ss = 0;
+    acc.write(0x22); // sets double tap gap to
+    acc.write(0x05);    // 6 ms
+    ss = 1;
+
+    ss = 0;
+    acc.write(0x23); // sets double tap window to 
+    acc.write(0xFF);    // 318.75 ms
+    ss = 1;
+
+    ss = 0;
+    acc.write(0x2A); // sets tap axes to enable the 
+    acc.write(0x07); // x, y, and z axes for tap detection
+    ss = 1;
+
+    ss = 0;
+    acc.write(0x2E); // sets interrupt enable just to
+    acc.write(0x60); // single/double taps
+    ss = 1;
+
+    ss = 0;
+    acc.write(0x2F); // sets interrupt map to set INT2 high if either a 
+    acc.write(0x60); // single or double tap interrupt is detected
+    ss = 1;
+
+    ss = 0;
+    acc.write(0x2D); // sets power control to
+    acc.write(0x08); // measure mode
+    ss = 1;
+
+    wait(0.5);
+    tapInterrupt.rise(&tapsHappened);
+    tapsHappened(); // the interrupt is high before getting to this line and will remain high before it is read again, 
+                    // this line reads it and sets it back to low allowing the program to continue working
+    while (true) {
+        led4 = !led4; // led4 flashes to show prgram is running
+        wait(0.3);
+    }
+}
+
+void tapsHappened(void) {
+    char tapByte;
+    ss = 0;
+    acc.write(0x30 | 0x80); // 0x30 is the address, 0x80 means we are reading it
+    tapByte = acc.write(0); // write zero to get a read response (could send anything). tapByte is set equal to this response
+    ss = 1;
+
+    if (tapByte & 0x40) { 
+        /* 0x40 converted to binary is a single tap. If there is a single tap, 
+        it turns on LED 1 and activates the singleOff function one second later */
+        led1 = 1;
+        singleTimeout.attach(&singleOff, 1.0);
+    }
+    if (tapByte & 0x20) { /* 0x20 converted to binary is a double tap. If there is a double tap, 
+        it turns on LED 2 and activates the doubleOff function one second later. 
+        This will turn on LED 1 and 2 because every double tap starts with a single tap */
+        led2 = 1;
+        doubleTimeout.attach(&doubleOff, 1.0);
+    }
+}
+void singleOff(void) {
+    // first LED off when this function is called by the timeout
+    led1 = 0;
+}
+void doubleOff(void) {
+    // first LED off when this function is called by the timeout
+    led2 = 0;
+}
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Wed Jan 16 07:03:19 2019 +0000
@@ -0,0 +1,1 @@
+https://os.mbed.com/users/mbed_official/code/mbed/builds/3a7713b1edbc
\ No newline at end of file