uint32_t osAtomicInc32(uint32_t *n)
{
uint32_t m;
//Enter critical section
osSuspendAllTasks();
//Increment the specified 32-bit integer
m = ++(*n);
//Leave critical section
osResumeAllTasks();
//Return the incremented value
return m;
}
void osFreeMem(void *p)
{
//Make sure the pointer is valid
if(p != NULL)
{
//Debug message
TRACE_DEBUG("Freeing memory at 0x%08" PRIXPTR "\r\n", (uintptr_t) p);
//Enter critical section
osSuspendAllTasks();
//Free memory block
free(p);
//Leave critical section
osResumeAllTasks();
}
}
void *osAllocMem(size_t size)
{
void *p;
//Enter critical section
osSuspendAllTasks();
//Allocate a memory block
p = malloc(size);
//Leave critical section
osResumeAllTasks();
//Debug message
TRACE_DEBUG("Allocating %" PRIuSIZE " bytes at 0x%08" PRIXPTR "\r\n", size, (uintptr_t) p);
//Return a pointer to the newly allocated memory block
return p;
}
OsTask *osCreateTask(const char_t *name, OsTaskCode taskCode,
void *params, size_t stackSize, int_t priority)
{
uint_t i;
OS_TASK *task;
void *stack;
//Enter critical section
osSuspendAllTasks();
//Loop through TCB table
for(i = 0; i < OS_PORT_MAX_TASKS; i++)
{
//Check whether the current entry is free
if(tcbTable[i] == NULL)
break;
}
//Any entry available in the table?
if(i < OS_PORT_MAX_TASKS)
{
//Allocate a memory block to hold the task's control block
task = osAllocMem(sizeof(OS_TASK));
//Successful memory allocation?
if(task != NULL)
{
//Allocate a memory block to hold the task's stack
stack = osAllocMem(stackSize * sizeof(uint_t));
//Successful memory allocation?
if(stack != NULL)
{
//Create a new task
OS_CreateTaskEx(task, name, priority, taskCode,
stack, stackSize * sizeof(uint_t), 1, params);
//Save TCB base address
tcbTable[i] = task;
//Save stack base address
stkTable[i] = stack;
}
else
{
osFreeMem(task);
//Memory allocation failed
task = NULL;
}
}
}
else
{
//Memory allocation failed
task = NULL;
}
//Leave critical section
osResumeAllTasks();
//Return task pointer
return task;
}
OsTask *osCreateTask(const char_t *name, OsTaskCode taskCode,
void *params, size_t stackSize, int_t priority)
{
OS_ERR err;
CPU_INT32U i;
CPU_STK stackLimit;
OS_TCB *task;
CPU_STK *stack;
//The watermark limit is used to monitor and ensure that the stack does not overflow
stackLimit = stackSize / 10;
//Enter critical section
osSuspendAllTasks();
//Loop through TCB table
for(i = 0; i < OS_PORT_MAX_TASKS; i++)
{
//Check whether the current entry is free
if(tcbTable[i] == NULL)
break;
}
//Any entry available in the table?
if(i < OS_PORT_MAX_TASKS)
{
//Allocate a memory block to hold the task's control block
task = osAllocMem(sizeof(OS_TCB));
//Successful memory allocation?
if(task != NULL)
{
//Allocate a memory block to hold the task's stack
stack = osAllocMem(stackSize * sizeof(CPU_STK));
//Successful memory allocation?
if(stack != NULL)
{
//Create a new task
OSTaskCreate(task, (CPU_CHAR *) name, taskCode, params,
priority, stack, stackLimit, stackSize, 0, 1, NULL,
OS_OPT_TASK_STK_CHK | OS_OPT_TASK_STK_CLR, &err);
//Check the return value
if(err == OS_ERR_NONE)
{
//Save TCB base address
tcbTable[i] = task;
//Save stack base address
stkTable[i] = stack;
}
else
{
//Clean up side effects
osFreeMem(task);
osFreeMem(stack);
}
}
else
{
//Memory allocation failed
err = OS_ERR_MEM_FULL;
//Clean up side effects
osFreeMem(task);
}
}
else
{
//Memory allocation failed
err = OS_ERR_MEM_FULL;
}
}
else
{
//No entry available in the table
err = OS_ERR_MEM_FULL;
}
//Leave critical section
osResumeAllTasks();
//Check whether the task was successfully created
if(err == OS_ERR_NONE)
return task;
else
return NULL;
}
