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A device’s input/output control/IO_Ctrl() function is used to implement miscellaneous functionality such as setting and getting the link state. An optional void pointer to a data variable is passed into the function and may be used to get device parameters from the caller, or to return device parameters to the caller.

Files

Every Wireless Manager layer net_wifi_mgr.c

Prototype



          static void NetWiFiMgr_IO_Ctrl (NET_IF     *p_if,
                                          CPU_INT08U  opt,
                                          void       *p_data,
                                          NET_ERR    *p_err);


Note that since every Wireless Manager’s IO_Ctrl() function is accessed only by function pointer via the Wireless Manager’s API structure, it doesn’t need to be globally available and should therefore be declared as ‘static’.

Arguments

p_if

Pointer to the interface to handle network device I/O operations.

opt

I/O operation to perform.

p_data

A pointer to a variable containing the data necessary to perform the operation or a pointer to a variable to store data associated with the result of the operation.

p_err

Pointer to variable that will receive the return error code from this function.

Returned Values

None.

Required Configuration

None.

Notes/Warnings

μC/TCP-IP defines the following default options:

  • NET_DEV_LINK_STATE_GET_INFO
  • NET_DEV_LINK_STATE_UPDATE

The NET_DEV_LINK_STATE_GET_INFO option expects p_data to point to a variable of type NET_DEV_LINK_WIFI for the case of an Ethernet driver. This variable has one field, link state, which are filled in by the device driver API. μC/TCP-IP internally uses this option code in order to periodically poll the driver for linkstate.

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