Hieu Vo / Mbed 2 deprecated NUCLEO_BTN_LED_DEMO

Simple firmware to test the I/O capabilities of a Nucleo 64 board

Dependencies:   mbed

main.cpp@1:69c43e344369, 2016-03-15 (annotated)

Committer:
hieuvt6
Date:
Tue Mar 15 21:55:12 2016 +0000
Revision:
1:69c43e344369
Parent:
0:43a77ff47221 
Move interrupt work to main to avoid heavy workload in interrupt handler.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
hieuvt6 0:43a77ff47221 1 #include "mbed.h"
hieuvt6 0:43a77ff47221 2
hieuvt6 0:43a77ff47221 3 #define DEBUG_0_PRINT_OUT_ENABLE 1
hieuvt6 0:43a77ff47221 4 #if DEBUG_0_PRINT_OUT_ENABLE
hieuvt6 0:43a77ff47221 5 #define DEBUG_0(...) { printf(__VA_ARGS__); }
hieuvt6 0:43a77ff47221 6 #else
hieuvt6 0:43a77ff47221 7 #define DEBUG_0(...) /* nothing */
hieuvt6 0:43a77ff47221 8 #endif /* #if DEBUG_0_PRINT_OUT_ENABLE */
hieuvt6 0:43a77ff47221 9
hieuvt6 0:43a77ff47221 10 #define LED_ON 1 // LED is ACTIVE HIGH. It turns ON when the control pin is HIGH
hieuvt6 0:43a77ff47221 11 #define LED_OFF 0 // LED is ACTIVE HIGH. It turns OFF when the control pin is LOW
hieuvt6 0:43a77ff47221 12 #define BUTTON_PRESSED_LED_STATE LED_ON
hieuvt6 0:43a77ff47221 13 #define BUTTON_RELEASED_LED_STATE LED_OFF
hieuvt6 0:43a77ff47221 14
hieuvt6 0:43a77ff47221 15 DigitalOut led1(LED1);
hieuvt6 0:43a77ff47221 16 InterruptIn userButton(USER_BUTTON);
hieuvt6 0:43a77ff47221 17
hieuvt6 1:69c43e344369 18 bool buttonPressedInterrupt = false;
hieuvt6 1:69c43e344369 19 bool buttonReleasedInterrupt = false;
hieuvt6 1:69c43e344369 20
hieuvt6 0:43a77ff47221 21 void
hieuvt6 0:43a77ff47221 22 buttonPressedCallback(void)
hieuvt6 0:43a77ff47221 23 {
hieuvt6 1:69c43e344369 24 // Flag main to handle heavy work. Heavy work should not be handle in interrupt handler
hieuvt6 1:69c43e344369 25 buttonPressedInterrupt = true;
hieuvt6 0:43a77ff47221 26 }
hieuvt6 0:43a77ff47221 27
hieuvt6 0:43a77ff47221 28 void
hieuvt6 0:43a77ff47221 29 buttonReleasedCallback(void)
hieuvt6 0:43a77ff47221 30 {
hieuvt6 1:69c43e344369 31 // Flag main to handle heavy work. Heavy work should not be handle in interrupt handler
hieuvt6 1:69c43e344369 32 buttonReleasedInterrupt = true;
hieuvt6 0:43a77ff47221 33 }
hieuvt6 0:43a77ff47221 34
hieuvt6 0:43a77ff47221 35 void
hieuvt6 0:43a77ff47221 36 initBoard(void)
hieuvt6 0:43a77ff47221 37 {
hieuvt6 0:43a77ff47221 38 // Init LED to turn ON by default
hieuvt6 0:43a77ff47221 39 led1 = BUTTON_RELEASED_LED_STATE;
hieuvt6 0:43a77ff47221 40 // Init button pressed and released behavior
hieuvt6 0:43a77ff47221 41 userButton.rise(buttonReleasedCallback); // Button is ACTIVE LOW. Released the button pull input pin HIGH, triggering the Rising Edge interrupt.
hieuvt6 0:43a77ff47221 42 userButton.fall(buttonPressedCallback); // Button is ACTIVE LOW. Pressed the button pull input pin LOW, triggering the Falling Edge interrupt.
hieuvt6 0:43a77ff47221 43 userButton.enable_irq();
hieuvt6 0:43a77ff47221 44 }
hieuvt6 0:43a77ff47221 45
hieuvt6 0:43a77ff47221 46 int
hieuvt6 0:43a77ff47221 47 main()
hieuvt6 0:43a77ff47221 48 {
hieuvt6 0:43a77ff47221 49 initBoard();
hieuvt6 1:69c43e344369 50
hieuvt6 1:69c43e344369 51 DEBUG_0("NUCLEO_BTN_LED_DEMO started\n");
hieuvt6 1:69c43e344369 52
hieuvt6 0:43a77ff47221 53 led1 = LED_ON;
hieuvt6 0:43a77ff47221 54 wait_ms(1000);
hieuvt6 0:43a77ff47221 55 led1 = LED_OFF;
hieuvt6 0:43a77ff47221 56 wait_ms(1000);
hieuvt6 0:43a77ff47221 57 while(1) {
hieuvt6 1:69c43e344369 58 if (buttonReleasedInterrupt)
hieuvt6 1:69c43e344369 59 {
hieuvt6 1:69c43e344369 60 led1 = BUTTON_RELEASED_LED_STATE;
hieuvt6 1:69c43e344369 61 DEBUG_0("button released\n");
hieuvt6 1:69c43e344369 62
hieuvt6 1:69c43e344369 63 buttonReleasedInterrupt = false;
hieuvt6 1:69c43e344369 64 }
hieuvt6 1:69c43e344369 65
hieuvt6 1:69c43e344369 66 if (buttonPressedInterrupt)
hieuvt6 1:69c43e344369 67 {
hieuvt6 1:69c43e344369 68 led1 = BUTTON_PRESSED_LED_STATE;
hieuvt6 1:69c43e344369 69 DEBUG_0("button pressed\n");
hieuvt6 1:69c43e344369 70
hieuvt6 1:69c43e344369 71 buttonPressedInterrupt = false;
hieuvt6 1:69c43e344369 72 }
hieuvt6 0:43a77ff47221 73 }
hieuvt6 0:43a77ff47221 74 }