Page Comparison

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usbd_phdc_os.h / usbd_phdc_os.c

Prototype

void  USBD_PHDC_OS_WrBulkLock (CPU_INT08U   class_nbr,
                               CPU_INT08U   prio,
                               CPU_INT16U   timeout,
                               USBD_ERR    *p_err);

Arguments

class_nbr

PHDC instance number.

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1. Two typical implementations will be possible here. The first one consists in pending on a semaphore that locks the write bulk pipe, just as we saw previously.
2. But since different QoS data can travel using a single bulk IN endpoint, you might want to prioritize them in function of the QoS. See PHDC RTOS QoS-based scheduler for more details on how a priority manager can be implemented.
3. p_err argument should be assigned as described in Table - Error Code Assignment in Function of Lock Operation Result.