Jakub Nawała / Mbed 2 deprecated SiSK-FRDM-K64F-USB-Keyboard

Application using FRDM-K64F board to emulate USB keyboard. When one of two buttons (present on the board) are pressed, predefined text is printed (as if it was input with a keyboard).

Dependencies:   USBDevice mbed

Fork of frdm_USB-HID-Mouse-Keyboard_auto by FRDM-K64F Code Share

main.cpp@1:a5ca446fb520, 2017-12-18 (annotated)

Committer:
jaknaw
Date:
Mon Dec 18 17:33:47 2017 +0000
Revision:
1:a5ca446fb520
Parent:
0:92846b9895f1 
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.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jaknaw 1:a5ca446fb520 1 /*
jaknaw 1:a5ca446fb520 2 * SiSK-FRDM-K64F-USB-Keyboard
jaknaw 1:a5ca446fb520 3 *
jaknaw 1:a5ca446fb520 4 * Application written for "Standardy i Systemy Komunikacyjne" (SiSK) laboratory
jaknaw 1:a5ca446fb520 5 * classes conducted at AGH UST, Faculty of Computer Science, Electronics and
jaknaw 1:a5ca446fb520 6 * Telecommunications.
jaknaw 1:a5ca446fb520 7 *
jaknaw 1:a5ca446fb520 8 * This software presents interrupts handling and USB Keyboard emulation using
jaknaw 1:a5ca446fb520 9 * FRDM-K64F board.
jaknaw 1:a5ca446fb520 10 *
jaknaw 1:a5ca446fb520 11 * User is encouradged to change "print_txt_sw2" and "print_txt_sw3" functions,
jaknaw 1:a5ca446fb520 12 * in order to define one's own strings that are going to be printed when SW2
jaknaw 1:a5ca446fb520 13 * or SW3 buttons are pressed on FRDM-K64F board.
jaknaw 1:a5ca446fb520 14 *
jaknaw 1:a5ca446fb520 15 * Important! After programming the FRDM-K64F board, remember to connect it to
jaknaw 1:a5ca446fb520 16 * the PC using "K64 USB" port and not "SDA USB" port.
jaknaw 1:a5ca446fb520 17 *
jaknaw 1:a5ca446fb520 18 * Author: Jakub Nawała <jakub.tadeusz.nawala@gmail.com>
jaknaw 1:a5ca446fb520 19 */
jaknaw 1:a5ca446fb520 20
GregC 0:92846b9895f1 21 #include "mbed.h"
GregC 0:92846b9895f1 22 #include "USBMouseKeyboard.h"
GregC 0:92846b9895f1 23
jaknaw 1:a5ca446fb520 24 /* Create interrupts for handling buttons press events */
jaknaw 1:a5ca446fb520 25 InterruptIn button_sw2(SW2);
jaknaw 1:a5ca446fb520 26 InterruptIn button_sw3(SW3);
jaknaw 1:a5ca446fb520 27
jaknaw 1:a5ca446fb520 28 /* Create green LED object */
jaknaw 1:a5ca446fb520 29 DigitalOut green_led(LED_GREEN);
jaknaw 1:a5ca446fb520 30
jaknaw 1:a5ca446fb520 31 /* Create USB keyboard object */
jaknaw 1:a5ca446fb520 32 USBKeyboard frdm_keyboard;
jaknaw 1:a5ca446fb520 33
jaknaw 1:a5ca446fb520 34 /* Define global flags for control of prints connected with button presses */
jaknaw 1:a5ca446fb520 35 bool sw2_pressed = false;
jaknaw 1:a5ca446fb520 36 bool sw3_pressed = false;
GregC 0:92846b9895f1 37
jaknaw 1:a5ca446fb520 38 /* Interrupt handlers for buttons press events */
jaknaw 1:a5ca446fb520 39 void sw2_int_handler() {
jaknaw 1:a5ca446fb520 40 sw2_pressed = true;
jaknaw 1:a5ca446fb520 41 green_led = !green_led;
jaknaw 1:a5ca446fb520 42 }
jaknaw 1:a5ca446fb520 43
jaknaw 1:a5ca446fb520 44 void sw3_int_handler() {
jaknaw 1:a5ca446fb520 45 sw3_pressed = true;
jaknaw 1:a5ca446fb520 46 green_led = !green_led;
jaknaw 1:a5ca446fb520 47 }
jaknaw 1:a5ca446fb520 48
jaknaw 1:a5ca446fb520 49 /* Functions for printing a text bonded with each button */
jaknaw 1:a5ca446fb520 50 void print_txt_sw2() {
jaknaw 1:a5ca446fb520 51 frdm_keyboard.printf("foo\n\r");
jaknaw 1:a5ca446fb520 52 }
jaknaw 1:a5ca446fb520 53
jaknaw 1:a5ca446fb520 54 void print_txt_sw3() {
jaknaw 1:a5ca446fb520 55 frdm_keyboard.printf("bar\n\r");
jaknaw 1:a5ca446fb520 56 }
jaknaw 1:a5ca446fb520 57
jaknaw 1:a5ca446fb520 58 /* Main body of the application */
GregC 0:92846b9895f1 59 int main(void) {
jaknaw 1:a5ca446fb520 60 /* Initialize LED */
jaknaw 1:a5ca446fb520 61 green_led = 0;
jaknaw 1:a5ca446fb520 62
jaknaw 1:a5ca446fb520 63 /* Setup interrupts for falling edge detected on the buttons pins */
jaknaw 1:a5ca446fb520 64 button_sw2.fall(&sw2_int_handler);
jaknaw 1:a5ca446fb520 65 button_sw3.fall(&sw3_int_handler);
jaknaw 1:a5ca446fb520 66
jaknaw 1:a5ca446fb520 67 /* Check what button was pressed and print appropriate text */
jaknaw 1:a5ca446fb520 68 while (true) {
jaknaw 1:a5ca446fb520 69 if(sw2_pressed) {
jaknaw 1:a5ca446fb520 70 print_txt_sw2();
jaknaw 1:a5ca446fb520 71 sw2_pressed = false;
jaknaw 1:a5ca446fb520 72 }
jaknaw 1:a5ca446fb520 73 if(sw3_pressed) {
jaknaw 1:a5ca446fb520 74 print_txt_sw3();
jaknaw 1:a5ca446fb520 75 sw3_pressed = false;
jaknaw 1:a5ca446fb520 76 }
jaknaw 1:a5ca446fb520 77
jaknaw 1:a5ca446fb520 78 /* Wait for interrupts */
jaknaw 1:a5ca446fb520 79 wait(0.5f);
GregC 0:92846b9895f1 80 }
jaknaw 1:a5ca446fb520 81
jaknaw 1:a5ca446fb520 82 /* This place shall never be reached! */
GregC 0:92846b9895f1 83 }