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Altera_Forum
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15 years ago

Help in semaphores

Hi Can anyone Plz Help me in Semaphores in MicroC os2 .Just Give me some Working Code of two task swithched on semaphores.Whether the task print hello word .it is fine.I have Used the the Functio...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Creating the Semaphore 

   
// create Semaphore 
   m_t_sem_access = OSSemCreate(0);
   if (m_t_sem_access == NULL) 
   {
       // just in case some error handling
   }
Accessing a semaphore protected area 


   OSSemPend(m_t_sem_access, 
                              L_SPI_ACCESS_TIMEOUT, 
                 &proc_i_error);   
   switch (proc_i_error)
      {
// error handling
....
}
Removing the Lock 


   proc_i_error = OSSemPost(m_t_sem_access);
   if (proc_i_error != OS_NO_ERR)
      {
....
      }
This code snippets are taken from my current project. The semaphore is used to protect access to a hardware device.

Karsten