S3C2416裸机开发系列十五_GCC下uCOS的移植(2)
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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
5. 用户代码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
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