Revision 1:a5ca446fb520, committed 2017-12-18

Comitter:

jaknaw

Date:

Mon Dec 18 17:33:47 2017 +0000

Parent:

0:92846b9895f1

Commit message:

Use FRDM-K64F board to simulate USB keyboard and print predefined text using interrupts when one of two buttons available on the board are pressed.

Changed in this revision

diff -r 92846b9895f1 -r a5ca446fb520 main.cpp
--- a/main.cpp	Thu Dec 31 17:24:55 2015 +0000
+++ b/main.cpp	Mon Dec 18 17:33:47 2017 +0000
@@ -1,21 +1,83 @@
+/*
+ * SiSK-FRDM-K64F-USB-Keyboard
+ *
+ * Application written for "Standardy i Systemy Komunikacyjne" (SiSK) laboratory
+ * classes conducted at AGH UST, Faculty of Computer Science, Electronics and
+ * Telecommunications.
+ *
+ * This software presents interrupts handling and USB Keyboard emulation using
+ * FRDM-K64F board.
+ * 
+ * User is encouradged to change "print_txt_sw2" and "print_txt_sw3" functions,
+ * in order to define one's own strings that are going to be printed when SW2
+ * or SW3 buttons are pressed on FRDM-K64F board.
+ *
+ * Important! After programming the FRDM-K64F board, remember to connect it to
+ * the PC using "K64 USB" port and not "SDA USB" port. 
+ *
+ * Author: Jakub Nawała <jakub.tadeusz.nawala@gmail.com>
+ */
+
 #include "mbed.h"
 #include "USBMouseKeyboard.h"
 
-DigitalOut led(LED1);
-USBMouseKeyboard key_mouse;
+/* Create interrupts for handling buttons press events */
+InterruptIn button_sw2(SW2);
+InterruptIn button_sw3(SW3);
+
+/* Create green LED object */
+DigitalOut green_led(LED_GREEN);
+
+/* Create USB keyboard object */
+USBKeyboard frdm_keyboard;
+
+/* Define global flags for control of prints connected with button presses */
+bool sw2_pressed = false;
+bool sw3_pressed = false;
 
+/* Interrupt handlers for buttons press events */
+void sw2_int_handler() {
+    sw2_pressed = true;
+    green_led = !green_led;
+}
+
+void sw3_int_handler() {
+    sw3_pressed = true;
+    green_led = !green_led;
+}
+
+/* Functions for printing a text bonded with each button */
+void print_txt_sw2() {
+    frdm_keyboard.printf("foo\n\r");
+}
+
+void print_txt_sw3() {
+    frdm_keyboard.printf("bar\n\r");
+}
+
+/* Main body of the application */
 int main(void) {
-    while (1) {
-        key_mouse.move(60, 0);
-        key_mouse.doubleClick();
-        key_mouse.keyCode(KEY_CAPS_LOCK);
-        key_mouse.printf("hello world from frdm-k64f. \n");
-        wait(2);
-        key_mouse.move(-60, 0);
-        key_mouse.doubleClick();
-        key_mouse.keyCode(KEY_CAPS_LOCK);
-        key_mouse.printf("hello world from frdm-k64f. \n");
-        led = ((key_mouse.lockStatus() & 0x2) >> 1); /* second bit is caps lock */
-        wait(2);
+    /* Initialize LED */
+    green_led = 0;
+    
+    /* Setup interrupts for falling edge detected on the buttons pins */
+    button_sw2.fall(&sw2_int_handler);
+    button_sw3.fall(&sw3_int_handler);
+    
+    /* Check what button was pressed and print appropriate text */
+    while (true) {
+        if(sw2_pressed) {
+            print_txt_sw2();
+            sw2_pressed = false;
+        }
+        if(sw3_pressed) {
+            print_txt_sw3();
+            sw3_pressed = false;
+        }
+        
+        /* Wait for interrupts */
+        wait(0.5f);
     }
+
+    /* This place shall never be reached! */
 }