Steven Kay / Mbed 2 deprecated Embedded_Software_Assignment_3

Example software of using the mbed-rtos to control a simple vehicle's on board computer

Dependencies:   MCP23017 WattBob_TextLCD mbed-rtos mbed

main.cpp@0:f7d6ed1dfe3e, 2016-03-21 (annotated)

Committer:
sk398
Date:
Mon Mar 21 13:57:22 2016 +0000
Revision:
0:f7d6ed1dfe3e
Child:
1:cdf851858518
Initial commit. 2 threads running correctly. Think the Mutex works well but not sure how to text

Who changed what in which revision?

UserRevisionLine numberNew contents of line
sk398 0:f7d6ed1dfe3e 1 #include "mbed.h"
sk398 0:f7d6ed1dfe3e 2 #include "rtos.h"
sk398 0:f7d6ed1dfe3e 3
sk398 0:f7d6ed1dfe3e 4 DigitalOut myled(LED1);
sk398 0:f7d6ed1dfe3e 5 AnalogIn Accelerometer(p20);
sk398 0:f7d6ed1dfe3e 6
sk398 0:f7d6ed1dfe3e 7 Mutex readvalues;
sk398 0:f7d6ed1dfe3e 8 Semaphore read_s(1);
sk398 0:f7d6ed1dfe3e 9
sk398 0:f7d6ed1dfe3e 10
sk398 0:f7d6ed1dfe3e 11 float readValue = 1.0;
sk398 0:f7d6ed1dfe3e 12
sk398 0:f7d6ed1dfe3e 13 typedef struct
sk398 0:f7d6ed1dfe3e 14 {
sk398 0:f7d6ed1dfe3e 15 float value;
sk398 0:f7d6ed1dfe3e 16 } value_t;
sk398 0:f7d6ed1dfe3e 17
sk398 0:f7d6ed1dfe3e 18 void thread1(void const *args)
sk398 0:f7d6ed1dfe3e 19 {
sk398 0:f7d6ed1dfe3e 20 while(1)
sk398 0:f7d6ed1dfe3e 21 {
sk398 0:f7d6ed1dfe3e 22 // read_s.wait();
sk398 0:f7d6ed1dfe3e 23 value_t *mail = mail_box.alloc();
sk398 0:f7d6ed1dfe3e 24
sk398 0:f7d6ed1dfe3e 25 readvalues.lock();
sk398 0:f7d6ed1dfe3e 26 value_t -> value = Accelerometer.read();
sk398 0:f7d6ed1dfe3e 27 readvalues.unlock();
sk398 0:f7d6ed1dfe3e 28 // read_s.release();
sk398 0:f7d6ed1dfe3e 29 // printf("hello-1 = %1.3f\r\n",readValue);
sk398 0:f7d6ed1dfe3e 30 Thread::wait(1000);
sk398 0:f7d6ed1dfe3e 31 }
sk398 0:f7d6ed1dfe3e 32
sk398 0:f7d6ed1dfe3e 33 }
sk398 0:f7d6ed1dfe3e 34
sk398 0:f7d6ed1dfe3e 35 void thread2(void const *args)
sk398 0:f7d6ed1dfe3e 36 {
sk398 0:f7d6ed1dfe3e 37 while(1)
sk398 0:f7d6ed1dfe3e 38 {
sk398 0:f7d6ed1dfe3e 39 readvalues.lock();
sk398 0:f7d6ed1dfe3e 40 // read_s.wait();
sk398 0:f7d6ed1dfe3e 41 printf("readValue = %s\r\n",(const char*)args);
sk398 0:f7d6ed1dfe3e 42 // read_s.release();
sk398 0:f7d6ed1dfe3e 43 readvalues.unlock();
sk398 0:f7d6ed1dfe3e 44 Thread::wait(500);
sk398 0:f7d6ed1dfe3e 45 }
sk398 0:f7d6ed1dfe3e 46
sk398 0:f7d6ed1dfe3e 47 }
sk398 0:f7d6ed1dfe3e 48
sk398 0:f7d6ed1dfe3e 49 int main() {
sk398 0:f7d6ed1dfe3e 50 char array[10];
sk398 0:f7d6ed1dfe3e 51
sk398 0:f7d6ed1dfe3e 52 Thread thread_1(thread1);
sk398 0:f7d6ed1dfe3e 53 Thread thread_2(thread2,(void *)array);
sk398 0:f7d6ed1dfe3e 54
sk398 0:f7d6ed1dfe3e 55 while(1) {
sk398 0:f7d6ed1dfe3e 56
sk398 0:f7d6ed1dfe3e 57 readvalues.lock();
sk398 0:f7d6ed1dfe3e 58 int var = sprintf(array,"%1.3f",readValue);
sk398 0:f7d6ed1dfe3e 59 printf("%s\r\n",array);
sk398 0:f7d6ed1dfe3e 60 readvalues.unlock();
sk398 0:f7d6ed1dfe3e 61
sk398 0:f7d6ed1dfe3e 62 myled = 1;
sk398 0:f7d6ed1dfe3e 63 wait(0.2);
sk398 0:f7d6ed1dfe3e 64 myled = 0;
sk398 0:f7d6ed1dfe3e 65 wait(0.2);
sk398 0:f7d6ed1dfe3e 66 }
sk398 0:f7d6ed1dfe3e 67 }