Revision 0:5c5a623dc9e0, committed 2015-09-24

Comitter:

noutram

Date:

Thu Sep 24 12:31:08 2015 +0000

Commit message:

Initial version 24-09-2015

Changed in this revision

diff -r 000000000000 -r 5c5a623dc9e0 main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Sep 24 12:31:08 2015 +0000
@@ -0,0 +1,65 @@
+#include "mbed.h"
+
+//Function prototype
+void doSample1Hz();
+void printBinary12(unsigned short u16);
+
+//Global objects
+Serial pc(USBTX, USBRX);
+AnalogIn POT_ADC_In(A0);
+DigitalOut led(LED1);
+
+//Shared variables
+volatile static unsigned short sample16 = 0;
+
+//The ticker, used to sample data at a fixed rate
+Ticker t;
+
+//Main function
+int main()
+{
+    //Set baud rate to 115200
+    pc.baud(115200);
+
+    //Set up the ticker - 100Hz
+    t.attach(doSample1Hz, 1.0);
+
+    while(1) {
+
+        //Sleep
+        sleep();
+
+        //Displauy the sample in HEX
+        printBinary12(sample16);
+ 
+    } //end while(1)
+} //end main
+
+//ISR for the ticker - simply there to perform sampling
+void doSample1Hz()
+{
+    //Toggle on board led
+    led = !led;
+
+    //READ ADC as an unsigned integer.
+    //Shift right 4 bits (this is a 12bit ADC) & store in static global variable
+    sample16 = POT_ADC_In.read_u16() >> 4;
+}
+
+//Function to print a 12-bit number in the binary format
+//(I've kept this simple to avoid confusion)
+void printBinary12(unsigned short u16)
+{
+    unsigned int mask = 0x800; //Binary 1000000000000000
+    for (unsigned int n=0; n<12; n++) {
+        //Test to see if the bit is set
+        if (u16 & mask) {
+            pc.printf("1");
+        } else {
+            pc.printf("0");   
+        }
+        //Shift mask 1 bit right
+        mask >>= 1;
+    }
+    pc.printf("\n"); 
+}

diff -r 000000000000 -r 5c5a623dc9e0 mbed.bld
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Thu Sep 24 12:31:08 2015 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/4f6c30876dfa
\ No newline at end of file