Stopping a Network Device

NetDev_Stop() is called once each time an interface is stopped.

NetDev_Stop() must perform the following operations:

1. Disable the receiver and transmitter.
2. Disable all local MAC interrupt sources.
3. Clear all local MAC interrupt status flags.
4. For DMA devices, re-initialize all receive descriptors.
5. For DMA devices, free all transmit descriptors by calling NetOS_IF_DeallocTaskPost() with the address of the transmit descriptor data areas.
6. For DMA devices, re-initialize all transmit descriptors.
7. Set perr to NET_DEV_ERR_NONE if no error occurs. Otherwise, set perr to an appropriate network device error code.