mytask.c

一个ucos-ii2.51移植到gcc下的port.大概是一个韩国人做的。从UCOS网站上那个VC的port改进而来。使用和介绍请见RAR文件中的注释。

// MyTask.c

#include "includes.h"

#define	TASK_STK_SIZE	1024	// task stack size
#define	N_TASKS		2	// number of tasks

OS_STK	TaskStk[N_TASKS][TASK_STK_SIZE/sizeof(OS_STK)];	// Tasks stacks

// Prototypes
void	Task(void * pParam);
void	Sleep(INT16U uSec);
void	ClearScreen();
void	OnScreen(int x, int y, char * pszText, int nColor);

// Application entry point, invoked from Entry.obj assembled from entry.S
int main()
{
	int	LineNo10 = 10;
	int	LineNo11 = 11;

	// Set the top of stack.
	__asm__ __volatile__("movl	$0xa0000, %esp\n");

	// Display a banner.
	ClearScreen();
	OnScreen(0, 0, "Welcome to Micro-C/OS-II on x86 in protected mode!", 14);

	// Initialize uC/OS.
	OSCpuInit();
    OSInit();

	// Create two tasks.
    OSTaskCreate(Task, &LineNo10, &TaskStk[0][TASK_STK_SIZE], 0);
    OSTaskCreate(Task, &LineNo11, &TaskStk[1][TASK_STK_SIZE], 1);

	// Start multitasking.
    OSStart();

    return 0;

	/* NEVER EXECUTED */
}

// Display a line of characters at the line specified by the parameter,
// assuming a color 80x25 video adapter.
//
// This function never returns.

void Task(void * pParam)
{
	int		LineNo = *(int *) pParam;
	char *	LineAddr = (char *) 0xb8000 + LineNo * 160;
	char *	p;
	int		i;

    while (1) 
	{
		p = LineAddr;

		for (i = 0; i < 80; i++) 
		{
			*p++ = (char) LineNo;
			*p++ = 12;
		}

		Sleep(1);

		p = LineAddr;

		for (i = 0; i < 80; i++) 
		{
			*p++ = ' ';
			*p++ = 14;
		}

		Sleep(1);
    }
}

// Sleeps for the specified delay (in seconds).
// Since the 8254 is not set in this implementation,
// sleeping one second means sleeping 18 clock ticks.

void Sleep(INT16U uSec)
{
	OSTimeDly((INT16U) (18 * uSec));
}

// Clears the screen.

void ClearScreen()
{
	int		x,y;
	char *	pScreen = (char *) 0xb8000;

	for (y = 0; y < 25; y++)
		for (x = 0; x < 80; x++)
		{
			*pScreen++ = ' ';
			*pScreen++ = 7;
		}
}

// Displays a string on the screen, assuming a 80x25 color adapter.

void OnScreen(int x, int y, char * pszText, int nColor)
{
	char *	pScreen = (char *) (0xb8000 + y * 160 + x * 2);

	while (*pszText)
	{
		*pScreen++ = *pszText++;
		*pScreen++ = nColor;
	}
}