Petka 85 86 88 Activation Thread Requirement Work -

expand_key(read_register(0x2A)); write_register(0x2B, computed_checksum); volatile("mb" ::: "memory"); petka_86_done = 1;

Some legacy systems lack an RTOS. In that case, you must emulate threading using a state machine in a single loop : petka 85 86 88 activation thread requirement work

enum WAIT_85, WAIT_86, WAIT_88 state = WAIT_85; while(1) switch(state) case WAIT_85: if(activate_85()) state = WAIT_86; break; case WAIT_86: if(activate_86()) state = WAIT_88; break; case WAIT_88: if(activate_88()) // all done return; volatile("mb" ::: "memory")

// Thread 86 (Medium priority) void thread_petka_86(void) while(!petka_85_ready) thread_yield(); petka_86_done = 1

// Shared flags (volatile to prevent reordering) volatile uint8_t petka_85_ready = 0; volatile uint8_t petka_86_done = 0; // Thread 85 (Highest priority) void thread_petka_85(void) write_register(0x2A, get_seed_from_rtc()); volatile("mb" ::: "memory"); // memory barrier petka_85_ready = 1; while(1) kick_watchdog(); sleep(10);