59 lines
1.9 KiB
C
59 lines
1.9 KiB
C
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// os.h
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// Runs on MSPM0
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// A very simple real time operating system with minimal features.
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// Jonathan Valvano
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// June 8, 2025
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/*
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Copyright 2025 by Jonathan W. Valvano, valvano@mail.utexas.edu
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You may use, edit, run or distribute this file
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as long as the above copyright notice remains
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THIS SOFTWARE IS PROVIDED "AS IS". NO WARRANTIES, WHETHER EXPRESS, IMPLIED
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OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE.
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VALVANO SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL,
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OR CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
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For more information about my classes, my research, and my books, see
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http://users.ece.utexas.edu/~valvano/
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*/
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#ifndef __OS_H
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#define __OS_H 1
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// fill these depending on your clock
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#define TIME_1MS 80000
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#define TIME_2MS 2*TIME_1MS
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#define TIME_5MS 5*TIME_1MS
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// function definitions in osasmSimple.s
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void OS_DisableInterrupts(void); // Disable interrupts
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void OS_EnableInterrupts(void); // Enable interrupts
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void StartOS(void);
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// ******** OS_Init ************
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// initialize operating system, disable interrupts until OS_Launch
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// initialize OS controlled I/O: systick, 50 MHz PLL
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// input: none
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// output: none
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void OS_Init(void);
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//******** OS_AddThread ***************
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// add three foregound threads to the scheduler
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// Inputs: three pointers to a void/void foreground tasks
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// Outputs: 1 if successful, 0 if this thread can not be added
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void OS_AddThreads(void(*task0)(void),
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void(*task1)(void),
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void(*task2)(void),void(*task3)(void));
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//******** OS_Launch ***************
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// start the scheduler, enable interrupts
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// Inputs: number of 20ns clock cycles for each time slice
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// (maximum of 24 bits)
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// Outputs: none (does not return)
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void OS_Launch(uint32_t theTimeSlice);
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#endif
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