NBoard / Mbed OS mbed-os-mutex

Purpose: Simple application example with 2 threads and mutual-exclusion (Mutex) to a shared ressource (a bargraph).

Dependencies:   IHM_V2

/media/uploads/jacquesolivierklein/mbed-os-mutex.png

Purpose: Simple application example with 2 threads and mutual-exclusion (Mutex) to a shared ressource (a bargraph).

Target: L432KC / Nboard (from IUT-Cachan) Tested: YES (2019-01-09) Author: Jacques-Olivier Klein - IUT de CACHAN Date: 2018-02-10 rev. 2019-01-09 OS_STACK_SIZE=4096 Libraries: mbed-os rev5345:c966348(03jan2019) + IHMV2 (from IUT-Cachan) rev6:ad91067

main.cpp@27:3780dd84a543, 2018-02-11 (annotated)

Committer:
jacquesolivierklein
Date:
Sun Feb 11 08:54:54 2018 +0000
Revision:
27:3780dd84a543
Parent:
22:af9dcf379926
Child:
29:8b329367eec8
initial

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jacquesolivierklein 27:3780dd84a543 1 // Title: mbed-os-mutex
jacquesolivierklein 27:3780dd84a543 2 // Author: Jacques-Olivier Klein - IUT de CACHAN
jacquesolivierklein 27:3780dd84a543 3 // Date: 2018-02-10
jacquesolivierklein 27:3780dd84a543 4
Jonathan Austin 0:2757d7abb7d9 5 #include "mbed.h"
jacquesolivierklein 27:3780dd84a543 6 #include "IHM.h"
jacquesolivierklein 27:3780dd84a543 7
jacquesolivierklein 27:3780dd84a543 8 IHM ihm;
Jonathan Austin 0:2757d7abb7d9 9
jacquesolivierklein 27:3780dd84a543 10 DigitalOut L0 (PB_3) ; // led L0
jacquesolivierklein 27:3780dd84a543 11 DigitalOut L1 (PA_7) ; // led L1
jacquesolivierklein 27:3780dd84a543 12 DigitalOut L2 (PA_6) ; // led L2
jacquesolivierklein 27:3780dd84a543 13
jacquesolivierklein 27:3780dd84a543 14 void bargraph_up_counter();
jacquesolivierklein 27:3780dd84a543 15 void bargraph_down_counter();
jacquesolivierklein 27:3780dd84a543 16
jacquesolivierklein 27:3780dd84a543 17 Mutex bargraph_mutex;
Jonathan Austin 0:2757d7abb7d9 18
jacquesolivierklein 27:3780dd84a543 19 Thread Thread_bargraph_up_counter;
jacquesolivierklein 27:3780dd84a543 20 Thread Thread_bargraph_down_counter;
jacquesolivierklein 27:3780dd84a543 21
jacquesolivierklein 27:3780dd84a543 22
jacquesolivierklein 27:3780dd84a543 23 int main(void)
jacquesolivierklein 27:3780dd84a543 24 { ihm.LCD_clear();
jacquesolivierklein 27:3780dd84a543 25 ihm.LCD_printf("Mutex-%s %s",__DATE__,__TIME__);
jacquesolivierklein 27:3780dd84a543 26 printf("\n\rmbed-os-mutex-%s %s\n\r",__DATE__,__TIME__);
jacquesolivierklein 27:3780dd84a543 27 printf(" DEFAULT_STACK_SIZE:%d\n\r", DEFAULT_STACK_SIZE);
jacquesolivierklein 27:3780dd84a543 28
jacquesolivierklein 27:3780dd84a543 29 Thread_bargraph_up_counter.start(bargraph_up_counter);
jacquesolivierklein 27:3780dd84a543 30 Thread_bargraph_down_counter.start(bargraph_down_counter);
jacquesolivierklein 27:3780dd84a543 31
jacquesolivierklein 27:3780dd84a543 32 while(1){
jacquesolivierklein 27:3780dd84a543 33 Thread::wait(4000);
jacquesolivierklein 27:3780dd84a543 34 L0=!L0;
jacquesolivierklein 27:3780dd84a543 35 printf(" [pid-%d]Main \n\r",Thread::gettid());
Jonathan Austin 0:2757d7abb7d9 36 }
Jonathan Austin 0:2757d7abb7d9 37 }
Jonathan Austin 1:846c97078558 38
jacquesolivierklein 27:3780dd84a543 39 void bargraph_up_counter(){
jacquesolivierklein 27:3780dd84a543 40 static int up_counter = 1;
jacquesolivierklein 27:3780dd84a543 41 while(1){
jacquesolivierklein 27:3780dd84a543 42 bargraph_mutex.lock();
jacquesolivierklein 27:3780dd84a543 43 L1=1;
jacquesolivierklein 27:3780dd84a543 44 for(up_counter = 1; up_counter != 0xFF; up_counter = (up_counter<<1)|1){
jacquesolivierklein 27:3780dd84a543 45 ihm.BAR_set(up_counter);
jacquesolivierklein 27:3780dd84a543 46 Thread::wait(200);
jacquesolivierklein 27:3780dd84a543 47 }
jacquesolivierklein 27:3780dd84a543 48 bargraph_mutex.unlock();
jacquesolivierklein 27:3780dd84a543 49 L1=0;
jacquesolivierklein 27:3780dd84a543 50 }
jacquesolivierklein 27:3780dd84a543 51 }
jacquesolivierklein 27:3780dd84a543 52
jacquesolivierklein 27:3780dd84a543 53 void bargraph_down_counter(){
jacquesolivierklein 27:3780dd84a543 54 static int down_counter = 1;
jacquesolivierklein 27:3780dd84a543 55 while(1){
jacquesolivierklein 27:3780dd84a543 56 bargraph_mutex.lock();
jacquesolivierklein 27:3780dd84a543 57 L2=1;
jacquesolivierklein 27:3780dd84a543 58 for(down_counter = 0x80; down_counter != 0xFF;
jacquesolivierklein 27:3780dd84a543 59 down_counter = (down_counter>>1)|0x80){
jacquesolivierklein 27:3780dd84a543 60 ihm.BAR_set(down_counter);
jacquesolivierklein 27:3780dd84a543 61 Thread::wait(200);
jacquesolivierklein 27:3780dd84a543 62 }
jacquesolivierklein 27:3780dd84a543 63 bargraph_mutex.unlock();
jacquesolivierklein 27:3780dd84a543 64 L2=0;
jacquesolivierklein 27:3780dd84a543 65 }
jacquesolivierklein 27:3780dd84a543 66 }