S3C2416裸机开发系列十五_GCC下uCOS的移植(2)

4. uCOS配置

uCOS是可裁减实时操作系统，可以根据实际的应用对内核未使用到的功能进行裁减，以进一步节省系统宝贵的硬件资源，通常可用的uCOS-II内核代码在6K~26K，这在uCOS-II配置文件os_cfg.h中进行配置，这个配置文件在源码目录为os_cfg_r.h，从目录中拷贝添加到uCOS/uCOS-II/Cfg目录中，并重命名为os_cfg.h。

#ifndef OS_CFG_H

#define OS_CFG_H

/* ---------------------------- MISCELLANEOUS -------------------------- */

#define OS_CFG_APP_HOOKS_EN 1u /* Enable/Disable application specific hooks*/

#define OS_CFG_ARG_CHK_EN 1u /*Enable/Disable argument checking*/

#define OS_CFG_CALLED_FROM_ISR_CHK_EN 1u /* check for called from ISR*/

#define OS_CFG_DBG_EN1u /* Enable (1) debugcode/variables */

#define OS_CFG_ISR_POST_DEFERRED_EN0u /* Enable/Disable DeferredISR posts */

#define OS_CFG_OBJ_TYPE_CHK_EN 1u /* Enable/Disable object typechecking*/

#define OS_CFG_TS_EN 1u /* Enable/Disable timestamping*/

#define OS_CFG_PEND_MULTI_EN 1u /* code generation formulti-pend feature */

#define OS_CFG_PRIO_MAX 32u /* maximum number of taskpriorities */

#define OS_CFG_SCHED_LOCK_TIME_MEAS_EN1u /* code to measure schedulerlock time */

#define OS_CFG_SCHED_ROUND_ROBIN_EN 1u /* code for Round-Robinscheduling */

#define OS_CFG_STK_SIZE_MIN 64u /* Minimum allowable taskstack size */

/* ----------------------------- EVENT FLAGS --------------------------- */

#define OS_CFG_FLAG_EN 1u /* Enable/Disable code forEVENT FLAGS*/

#define OS_CFG_FLAG_DEL_EN 0u /* Include code forOSFlagDel()*/

#define OS_CFG_FLAG_MODE_CLR_EN 0u /* code for Wait on ClearEVENT FLAGS*/

#define OS_CFG_FLAG_PEND_ABORT_EN 0u /* Include code forOSFlagPendAbort()*/

/* -------------------------- MEMORY MANAGEMENT ------------------------ */

#define OS_CFG_MEM_EN1u /* code generation for MEMORYMANAGER */

/* --------------------- MUTUAL EXCLUSION SEMAPHORES ------------------- */

#define OS_CFG_MUTEX_EN 1u /* code generation for MUTEX*/

#define OS_CFG_MUTEX_DEL_EN 0u /* code for OSMutexDel()*/

#define OS_CFG_MUTEX_PEND_ABORT_EN0u /* code for OSMutexPendAbort()*/

/* --------------------------- MESSAGE QUEUES -------------------------- */

#define OS_CFG_Q_EN 1u /* code generation for QUEUES*/

#define OS_CFG_Q_DEL_EN 0u /* Include code forOSQDel()*/

#define OS_CFG_Q_FLUSH_EN 0u /* Include code forOSQFlush()*/

#define OS_CFG_Q_PEND_ABORT_EN1u /* Include code forOSQPendAbort()*/

/* ----------------------------- SEMAPHORES ---------------------------- */

#define OS_CFG_SEM_EN 1u/* code generation for SEMAPHORES */

#define OS_CFG_SEM_DEL_EN 0u /* Include code forOSSemDel()*/

#define OS_CFG_SEM_PEND_ABORT_EN1u /* Include code forOSSemPendAbort()*/

#define OS_CFG_SEM_SET_EN 1u /* Include code forOSSemSet()*/

/* -------------------------- TASK MANAGEMENT -------------------------- */

#define OS_CFG_STAT_TASK_EN 1u /* Enable/Disable thestatistics task*/

#define OS_CFG_STAT_TASK_STK_CHK_EN1u /* Check task stacks fromstatistic task*/

#define OS_CFG_TASK_CHANGE_PRIO_EN 1u /* Include code forOSTaskChangePrio()*/

#define OS_CFG_TASK_DEL_EN 0u /* Include code forOSTaskDel()*/

#define OS_CFG_TASK_Q_EN 1u /* Include code forOSTaskQXXXX()*/

#define OS_CFG_TASK_Q_PEND_ABORT_EN0u /* Include code forOSTaskQPendAbort()*/

#define OS_CFG_TASK_PROFILE_EN 1u /* variables in OS_TCB forprofiling */

#define OS_CFG_TASK_REG_TBL_SIZE 1u /* Number of task specificregisters*/

#define OS_CFG_TASK_SEM_PEND_ABORT_EN1u /* Include code forOSTaskSemPendAbort()*/

#define OS_CFG_TASK_SUSPEND_EN 1u /* OSTaskSuspend() and OSTaskResume()*/

/* -------------------------- TIME MANAGEMENT -------------------------- */

#define OS_CFG_TIME_DLY_HMSM_EN 1u /* Include code forOSTimeDlyHMSM()*/

#define OS_CFG_TIME_DLY_RESUME_EN0u /* Include code forOSTimeDlyResume()*/

/* ------------------- TASK LOCAL STORAGE MANAGEMENT ------------------- */

#define OS_CFG_TLS_TBL_SIZE 0u /* code for Task LocalStorage (TLS) registers */

/* ------------------------- TIMER MANAGEMENT -------------------------- */

#define OS_CFG_TMR_EN 1u /*Enable/Disablecode generation for TIMERS */

#define OS_CFG_TMR_DEL_EN 0u /*Enable/Disable code generation for OSTmrDel()*/

#endif

用户需要提供一个周期性定时中断作为uCOS-II的运行Tick，每个Tick需调用OSTimeTick()来让内核管理时钟节拍，在s3c2416用定时器4产生这个系统Tick。在main()函数中需调用OSInit()初始化内核，创建任务后，再调用OSStart()把cpu管理权交给内核。内核即可正确地管理用户的任务。

#include "s3c2416.h"

#include "Exception.h"

#include "ucos_ii.h"

// IO port for controling LEDs

#define LED2 (13) // GPE13 LED2

#define LED3 (11) // GPE11 LED3

#define LED4 (13) // GPL13 LED4

#define LED5 (12) // GPE12 LED5

#define LED6 (2) // GPG2 LED6

OS_STKTaskStartStk[TASK_START_STK_SIZE];

OS_STK Task1Stk[TASK1_STK_SIZE];

OS_STK Task2Stk[TASK2_STK_SIZE];

OS_STK Task3Stk[TASK3_STK_SIZE];

static void Timer4_IRQ(void)

{

OSTimeTick(); // uCOS时钟节拍管理

rSRCPND1 |= (0x01 <

rINTPND1 |= (0x01 <

}

void Timer4_Start()

{

rTCON |= (0x1 << 20); // 定时器开启

}

void Timer4_Stop()

{

rTCON &= ~(0x1 << 20);// 定时器停止

}

void Timer4_Init()

{

// 定时器4时钟频率为PCLK(66.66666M)/(0+1)/16=4.166MHZ

rTCFG1 &= ~(0xf << 16);

rTCFG1 |= (0x3 << 16); // Timer4 16分频

rTCFG0 &= ~(0xff << 8);

rTCFG0 |= (0 << 8); // PCLK预分频为1

rTCNTB4 = 4166; // System Tick设1ms

rTCON |= (0x1 << 21); // 更新计数值

rTCON &= ~(0x1 << 21);// 清除

rTCON |= (0x1 << 22); // 自动重装载

IRQ_Register(INT_TIMER4,Timer4_IRQ); // 注册Timer4中断函数

rINTMOD1 &= ~(1 <

rINTMSK1 &= ~(1 <

}

void Gpio_LED2(unsigned char On)

{

if (!On) {

rGPEDAT &=~(1<

} else {

rGPEDAT |= (1<

}

}

void Gpio_LED3(unsigned char On)

{

if (!On) {

rGPEDAT &=~(1<

} else {

rGPEDAT |= (1<

}

}

void Gpi