OS.h File Reference

Real Time Operating System for Labs 1, 2, 3, 4 and 5. More...

#include <stdint.h>

Go to the source code of this file.

Data Structures
struct	Sema4
	Semaphore structure. Feel free to change the type of semaphore, there are lots of good solutions. More...
struct	Program

Macros
#define	LAB1   0
	Set which lab is active so I can use the same OS.c for all Labs.
#define	LAB2   0
#define	LAB3   0
#define	LAB4   0
#define	LAB5   1
#define	LAB6   0
#define	TIME_1MS   80000
	Times assuming a 80 MHz.
#define	TIME_2MS   (2*TIME_1MS)
#define	TIME_500US   (TIME_1MS/2)
#define	TIME_250US   (TIME_1MS/4)

Typedefs
typedef struct Sema4	Sema4_t
typedef struct Program	Program_t

Functions
void	OS_Init (void)
	Initialize OS. More...
void	OS_InitSemaphore (Sema4_t *semaPt, int32_t value)
void	OS_Wait (Sema4_t *semaPt)
void	OS_Signal (Sema4_t *semaPt)
void	OS_bWait (Sema4_t *semaPt)
void	OS_bSignal (Sema4_t *semaPt)
int	OS_AddThread (void(*task)(void), uint32_t stackSize, uint32_t priority)
uint32_t	OS_Id (void)
int	OS_AddPeriodicThread (void(*task)(void), uint32_t period, uint32_t priority)
int	OS_AddS1Task (void(*task)(void), uint32_t priority)
int	OS_AddS2Task (void(*task)(void), uint32_t priority)
int	OS_AddPA28Task (void(*task)(void), uint32_t priority)
void	OS_Sleep (uint32_t sleepTime)
void	OS_Kill (void)
void	OS_Suspend (void)
uint32_t	OS_LockScheduler (void)
void	OS_UnLockScheduler (uint32_t previous)
void	OS_Fifo_Init (uint32_t size)
int	OS_Fifo_Put (uint32_t data)
uint32_t	OS_Fifo_Get (void)
int32_t	OS_Fifo_Size (void)
void	OS_MailBox_Init (void)
void	OS_MailBox_Send (uint32_t data)
uint32_t	OS_MailBox_Recv (void)
uint32_t	OS_Time (void)
uint32_t	OS_TimeDifference (uint32_t start, uint32_t stop)
void	OS_ClearMsTime (void)
uint32_t	OS_MsTime (void)
void	OS_Launch (uint32_t theTimeSlice)
int	OS_LoadProgram (char *name, uint32_t priority)

Detailed Description

Real Time Operating System for Labs 1, 2, 3, 4 and 5.

ECE445M

Version

V1.0

Author

Valvano

Copyright

Copyright 2026 by Jonathan W. Valvano, valva.nosp@m.no@m.nosp@m.ail.u.nosp@m.texa.nosp@m.s.edu,

Warning

AS-IS

Note

For more information see http://users.ece.utexas.edu/~valvano/

Date

January 10, 2026

Function Documentation

OS_Init()

void OS_Init

(

void

)

Initialize OS.

Initialize operating system, disable interrupts until OS_Launch. Initialize OS controlled I/O: serial, ADC, systick, LaunchPad I/O and timers. Interrupts not yet enabled.

Parameters

none

Returns

none