main.cpp

00001 #include "mbed.h"
00002 #include "greentea-client/test_env.h"
00003 #include "rtos.h"
00004 
00005 #if defined(MBED_RTOS_SINGLE_THREAD)
00006   #error [NOT_SUPPORTED] test not supported
00007 #endif
00008 
00009 #define THREAD_DELAY     50
00010 #define SIGNALS_TO_EMIT  100
00011 
00012 /*
00013  * The stack size is defined in cmsis_os.h mainly dependent on the underlying toolchain and
00014  * the C standard library. For GCC, ARM_STD and IAR it is defined with a size of 2048 bytes
00015  * and for ARM_MICRO 512. Because of reduce RAM size some targets need a reduced stacksize.
00016  */
00017 #if defined(TARGET_STM32F334R8) && defined(TOOLCHAIN_IAR)
00018     #define STACK_SIZE DEFAULT_STACK_SIZE/4
00019 #elif defined(TARGET_STM32F070RB)
00020     #define STACK_SIZE DEFAULT_STACK_SIZE/2 
00021 #elif defined(TARGET_STM32F072RB)
00022     #define STACK_SIZE DEFAULT_STACK_SIZE/2 
00023 #elif defined(TARGET_STM32F302R8) && defined(TOOLCHAIN_IAR)
00024     #define STACK_SIZE DEFAULT_STACK_SIZE/2     
00025 #elif defined(TARGET_STM32F303K8) && defined(TOOLCHAIN_IAR)
00026     #define STACK_SIZE DEFAULT_STACK_SIZE/2
00027 #elif defined(TARGET_STM32L073RZ)
00028     #define STACK_SIZE DEFAULT_STACK_SIZE/2
00029 #elif (defined(TARGET_EFM32HG_STK3400)) && !defined(TOOLCHAIN_ARM_MICRO)
00030     #define STACK_SIZE 512
00031 #elif (defined(TARGET_EFM32LG_STK3600) || defined(TARGET_EFM32WG_STK3800) || defined(TARGET_EFM32PG_STK3401)) && !defined(TOOLCHAIN_ARM_MICRO)
00032     #define STACK_SIZE 768
00033 #elif (defined(TARGET_EFM32GG_STK3700)) && !defined(TOOLCHAIN_ARM_MICRO)
00034     #define STACK_SIZE 1536
00035 #elif defined(TARGET_MCU_NRF51822) || defined(TARGET_MCU_NRF52832)
00036     #define STACK_SIZE 1024
00037 #elif defined(TARGET_XDOT_L151CC)
00038     #define STACK_SIZE 1024
00039 #else
00040     #define STACK_SIZE DEFAULT_STACK_SIZE
00041 #endif
00042 
00043 void print_char(char c = '*') {
00044     printf("%c", c);
00045     fflush(stdout);
00046 }
00047 
00048 Mutex stdio_mutex;
00049 DigitalOut led(LED1);
00050 
00051 volatile int change_counter = 0;
00052 volatile bool changing_counter = false;
00053 volatile bool mutex_defect = false;
00054 
00055 bool manipulate_protected_zone(const int thread_delay) {
00056     bool result = true;
00057 
00058     stdio_mutex.lock(); // LOCK
00059     if (changing_counter == true) {
00060         // 'e' stands for error. If changing_counter is true access is not exclusively
00061         print_char('e');
00062         result = false;
00063         mutex_defect = true;
00064     }
00065     changing_counter = true;
00066 
00067     // Some action on protected
00068     led = !led;
00069     change_counter++;
00070     print_char('.');
00071     Thread::wait(thread_delay);
00072 
00073     changing_counter = false;
00074     stdio_mutex.unlock();   // UNLOCK
00075     return result;
00076 }
00077 
00078 void test_thread(void const *args) {
00079     const int thread_delay = int(args);
00080     while (true) {
00081         manipulate_protected_zone(thread_delay);
00082     }
00083 }
00084 
00085 int main() {
00086     GREENTEA_SETUP(20, "default_auto");
00087 
00088     const int t1_delay = THREAD_DELAY * 1;
00089     const int t2_delay = THREAD_DELAY * 2;
00090     const int t3_delay = THREAD_DELAY * 3;
00091     Thread t2(test_thread, (void *)t2_delay, osPriorityNormal, STACK_SIZE);
00092     Thread t3(test_thread, (void *)t3_delay, osPriorityNormal, STACK_SIZE);
00093 
00094     while (true) {
00095         // Thread 1 action
00096         Thread::wait(t1_delay);
00097         manipulate_protected_zone(t1_delay);
00098         if (change_counter >= SIGNALS_TO_EMIT or mutex_defect == true) {
00099             t2.terminate();
00100             t3.terminate();
00101             break;
00102         }
00103     }
00104 
00105     fflush(stdout);
00106     GREENTEA_TESTSUITE_RESULT(!mutex_defect);
00107     return 0;
00108 }