stm32f051 ucos 官方代码求教

只看该作者 · 2016-3-9 10:38

看到 ucos 的节拍控制它的设定函数是这样的#define OS_TICKS_PER_SEC 1000

OS_CPU_SysTickInit(OS_TICKS_PER_SEC);

函数代码如下
#define  OS_CPU_CM0_NVIC_ST_RELOAD  (*((volatile INT32U *)0xE000E014uL)) /* SysTick Reload  Value Reg. */

void  OS_CPU_SysTickInit (INT32U  cnts)
{
INT32U  prio;

OS_CPU_CM0_NVIC_ST_RELOAD = cnts - 1u;

prio  = OS_CPU_CM0_NVIC_PRIO_ST;
prio &= ~(OS_CPU_CM0_NVIC_PRIO_MIN);
prio |= OS_CPU_CM0_NVIC_PRIO_MIN;
                                             /* Set prio of SysTick handler to min prio.          */
OS_CPU_CM0_NVIC_PRIO_ST = prio;
                                             /* Enable timer.                                     */
OS_CPU_CM0_NVIC_ST_CTRL  |= OS_CPU_CM0_NVIC_ST_CTRL_CLK_SRC | OS_CPU_CM0_NVIC_ST_CTRL_ENABLE;
                                             /* Enable timer interrupt.                         */
OS_CPU_CM0_NVIC_ST_CTRL  |= OS_CPU_CM0_NVIC_ST_CTRL_INTEN;
}

感觉这样设置不对的样子,感觉应该是
OS_CPU_CM0_NVIC_ST_RELOAD = 时钟源/cnts-1;
对stm32f051 不熟悉求教

只看该作者 · 2016-3-9 11:19

cnts = 时钟源/OS_TICKS_PER_SEC

只看该作者 · 2016-3-9 11:43

本帖最后由 qbasicljx 于 2016-3-9 11:45 编辑

草代码只看了一半原来
static  void  AppTaskStart (void *p_arg)
{
CPU_INT32U  cpu_clk_freq;
CPU_INT32U  cnts;

(void)p_arg;                                              /* Note #1                                           */

OS_CPU_SysTickInit(OS_TICKS_PER_SEC);                      /* Initialize tick counter                            */

BSP_Init();                                              /* Initialize BSP functions                            */
CPU_Init();                                              /* Initialize the uC/CPU services                      */

cpu_clk_freq = BSP_CPU_ClkFreq();                         /* Determine SysTick reference freq.                   */
cnts       = cpu_clk_freq                               /* Determine nbr SysTick increments                   */
               / (CPU_INT32U)OS_TICKS_PER_SEC;

OS_CPU_SysTickInit(cnts);                                 /* Init uC/OS periodic time src (SysTick).             */

为什么要定义两次系统时钟呢
还有那个 cpu_init() 是做什么的我觉得旧版的 ucos2 好像没有这个东西

stm32f051 ucos 官方代码 求教

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stm32f051 ucos 官方代码求教