Diff: main.cpp

Revision:

0:57171dc76fb5

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri Feb 07 20:21:19 2020 +0000
@@ -0,0 +1,142 @@
+#include "mbed.h"
+Timer timer1; // define timer object
+DigitalOut output1(p5); // digital output
+
+void task1(void); // task function prototype
+
+int main()
+{
+    timer1.start(); // start timer counting
+    while(1) {
+        if (timer1.read_ms()>=200) { // read time in ms
+            task1(); // call task function
+            timer1.reset(); // reset timer
+        }
+    }
+}
+void task1(void)  // task function
+{
+    output1=!output1; // toggle output
+}
+
+/*
+Using multiple timers
+*/
+//*** main code
+int main()
+{
+    timer1.start(); // start timer1 counting
+    timer2.start(); // start timer2 counting
+    while(1) {
+        if (timer1.read_ms()>=200) { // read time
+            task1(); // call task1 function
+            timer1.reset(); // reset timer
+        }
+        if (timer2.read_ms()>=1000) { // read time
+            task2(); // call task2 function
+            timer2.reset(); // reset timer
+        }
+    }
+}
+// continued...
+// ...continued
+//*** task functions
+void task1(void)
+{
+    output1=!output1; // toggle output1
+}
+void task2(void)
+{
+    output2=!output2; // toggle output2
+}
+
+/*
+Using the mbed Ticker object
+Exercise:
+Use two tickers to create square wave outputs.
+Use an LED or an oscilloscope on the
+mbed pins to check that the two tickers
+are executing correctly.
+*/
+
+#include "mbed.h"
+Ticker flipper1;
+Ticker flipper2;
+DigitalOut led1(p5);
+DigitalOut led2(p6);
+
+void flip1()   // flip 1 function
+{
+    led1 = !led1;
+}
+
+void flip2()   // flip 2 function
+{
+    led2 = !led2;
+}
+
+int main()
+{
+    led1 = 0;
+    led2 = 0;
+
+    flipper1.attach(&flip1, 0.2); // the address of the
+// function to be attached
+// and the interval (sec)
+    flipper2.attach(&flip2, 1.0);
+// spin in a main loop
+// flipper will interrupt it to call flip
+
+    while(1) {
+        wait(0.2);
+    }
+}
+
+/*
+External interrupts on the mbed
+*/
+
+
+#include "mbed.h"
+InterruptIn button(p18); // Interrupt on digital pushbutton input p18
+DigitalOut led1(p5); // digital out to p5
+
+void toggle(void); // function prototype
+
+int main()
+{
+    button.rise(&toggle); // attach the address of the toggle
+} // function to the rising edge
+
+void toggle()
+{
+    led1=!led1;
+}
+
+/*
+Switch debouncing for interrupt control
+*/
+
+#include "mbed.h"
+InterruptIn button(p18); // Interrupt on digital pushbutton input p18
+DigitalOut led1(p5); // digital out to p5
+Timer debounce; // define debounce timer
+
+void toggle(void); // function prototype
+
+int main()
+{
+    debounce.start();
+    button.rise(&toggle); // attach the address of the toggle
+} // function to the rising edge
+
+void toggle()
+{
+    if (debounce.read_ms()>200) // only allow toggle if debounce timer
+        led1=!led1; // has passed 200 ms
+    debounce.reset(); // restart timer when the toggle is performed
+}
+
+
+
+