关于函数参数void* argv的使用问题
函数CoCreate
函数原型：
OS_TID CoCreateTask (
FUNCPtr task,
void* argv,
U8 prio,
OS_STK* stk,
U16 stkSz,
)
功能描述：
创建一个任务并返回任务ID。
函数参数：
[IN] task
创建任务的函数体
[IN] argv
任务函数体的传入参数列表
[IN] prio
任务优先级
[IN] stk
任务堆栈起始地址
[IN] stkSz
任务堆栈大小（单位为字）
返回值：
任务ID， 创建任务成功
-1， 创建任务失败
这是CoOS操作系统中的一个函数,下面一个例子中用到它,但参数写的有些问题
/*---------------------------- Inlcude ---------------------------------------*/#include /*!< CoOS header file *//*---------------------------- Symbol Define -------------------------------*/#define STACK_SIZE_TASKA 128 /*!< Define "taskA" task size */#define STACK_SIZE_TASKB 128 /*!< Define "taskA" task size */#define STACK_SIZE_TASKC 128 /*!< Define "taskA" task size *//*---------------------------- Variable Define -------------------------------*/OS_STK taskA_stk[STACK_SIZE_TASKA]; /*!< Define "taskA" task stack */OS_STK taskB_stk[STACK_SIZE_TASKB]; /*!< Define "taskB" task stack */OS_STK taskC_stk[STACK_SIZE_TASKC]; /*!< Define "led" task stack */typedef struct { long m1; unsigned long m2; long m3; }test_t;const test_t par={345,20,130};/** ******************************************************************************* * @brief "taskA" task code * @param[in] None * @param[out] None * @retval None * @par Description * @details This task use to crate mutex and flags,print message "taskA running". * Indicate "taskA" had been executed. ******************************************************************************* */void taskA (unsigned int st){ unsigned int led_num; led_num=st; for (;;) { led_num++; CoTickDelay (50); }}/** ******************************************************************************* * @brief "taskB" task code * @param[in] None * @param[out] None * @retval None * @par Description * @details This task use to print message "taskB running". Indicate "taskB" * had been executed. ******************************************************************************* */void taskB (test_t* p){ unsigned int led_num; led_num=p->m3; for (;;) { led_num++; CoTickDelay (50); }}/** ******************************************************************************* * @brief "led" task code * @param[in] None * @param[out] None * @retval None * @par Description * @details This function use to blink led,and set flag for "taskA" and "taskB". ******************************************************************************* */void taskC (void* pdata){ unsigned int led_num; for (;;) { led_num++; CoTickDelay (50); }}/** ******************************************************************************* * @brief main function * @param[in] None * @param[out] None * @retval None ******************************************************************************* */int main (){ CoInitOS (); /*!< Initial CooCox CoOS */ /*!< Create three tasks */ CoCreateTask (taskA,123,0,&taskA_stk[STACK_SIZE_TASKA-1],STACK_SIZE_TASKA); CoCreateTask (taskB,&par,1,&taskB_stk[STACK_SIZE_TASKB-1],STACK_SIZE_TASKB); CoCreateTask (taskC,0,2,&taskC_stk[STACK_SIZE_TASKC-1],STACK_SIZE_TASKC); CoStartOS (); /*!< Start multitask */ while (1); /*!< The code don''t reach here */}
[cc] E:\WorkProject\CooCox\OSTest\example\CoOS_App_Framework.c:98:3: warning: passing argument 1 of 'CreateTask' from incompatible pointer type
[cc] E:\WorkProject\CooCox\OSTest\CoOS\kernel/CoOS.h:136:20: note: expected 'FUNCPtr' but argument is of type 'void (*)(unsigned int)'
[cc] E:\WorkProject\CooCox\OSTest\example\CoOS_App_Framework.c:98:3: warning: passing argument 2 of 'CreateTask' makes pointer from integer without a cast
[cc] E:\WorkProject\CooCox\OSTest\CoOS\kernel/CoOS.h:136:20: note: expected 'void *' but argument is of type 'int'
[cc] E:\WorkProject\CooCox\OSTest\example\CoOS_App_Framework.c:99:3: warning: passing argument 1 of 'CreateTask' from incompatible pointer type
[cc] E:\WorkProject\CooCox\OSTest\CoOS\kernel/CoOS.h:136:20: note: expected 'FUNCPtr' but argument is of type 'void (*)(struct test_t *)'
[cc] E:\WorkProject\CooCox\OSTest\example\CoOS_App_Framework.c:99:3: warning: passing argument 2 of 'CreateTask' discards qualifiers from pointer target type
[cc] E:\WorkProject\CooCox\OSTest\CoOS\kernel/CoOS.h:136:20: note: expected 'void *' but argument is of type 'const struct test_t *'
[解决办法]
加“”，变成字符串试试，本来我想先试试再给你说的，可是我没有你这个系统环境。是UCOS吧
[解决办法]
void* 的意思是你可以传进入任何类型的指针。
[解决办法]
是任何的指针类型。不是任意类型。
[解决办法]
unsigned int param1 = 123;
void * param3 = 0;
CoCreateTask (taskA,(void*)¶m1,0,&taskA_stk[STACK_SIZE_TASKA-1],STACK_SIZE_TASKA);
CoCreateTask (taskB,(void*)&par,1,&taskB_stk[STACK_SIZE_TASKB-1],STACK_SIZE_TASKB);
CoCreateTask (taskC,param3,2,&taskC_stk[STACK_SIZE_TASKC-1],STACK_SIZE_TASKC);
[解决办法]