Craig Evans
/
ELEC2645_TimeTriggeredInterrupt_2021
Ticker example
main.cpp
- Committer:
- eencae
- Date:
- 2020-12-09
- Revision:
- 0:8888b2ad5510
File content as of revision 0:8888b2ad5510:
/* 2645_Ticker Sample code from ELEC2645 Demonstrates how to use a ticker to generate a periodic timer interrupt (c) Craig A. Evans, University of Leeds, Jan 2016 */ #include "mbed.h" // Create objects for ticker and red LED Ticker ticker; DigitalOut led(LED1); // flag - must be volatile as changes within ISR // g_ prefix makes it easier to distinguish it as global volatile int g_timer_flag = 0; // function prototypes void timer_isr(); int main() { // set-up the ticker so that the ISR it is called every 0.5 seconds ticker.attach(&timer_isr,0.5); while (1) { // check if flag is set i.e. interrupt has occured if (g_timer_flag) { g_timer_flag = 0; // if it has, clear the flag printf("Tick \n"); // DO TASK HERE } // put the MCU to sleep until an interrupt wakes it up sleep(); } } // time-triggered interrupt void timer_isr() { g_timer_flag = 1; // set flag in ISR }