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This function is called by a device driver to acquire the SPI lock and restrict the access to the SPI bus only to the wireless driver.

Files

net_bsp.c

Prototype

          static CPU_INT32U NetDev_WiFi_SPI_Lock (NET_IF  *p_if,
                                                  NET_ERR *p_err);

Note that since NetDev_WiFi_SPI_Lock() is accessed only by function pointer via a BSP interface structure, it doesn’t need to be globally available and should therefore be declared as ‘static’.

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• NetDev_WiFi_SPI_Lock must be implemented if more than one device’s hardware share the same SPI bus.
• Since each network device requires a unique NetDev_WiFi_SPI_Lock(), it is recommended that each device’s NetDev_WiFi_SPI_Lock() function be named using the following convention:

  NetDev_WiFi_[Device]SPI_Lock[Number]()
[Device]

  Network device name or type, e.g. RS9110 (optional if the development board does not support multiple devices)

[Number]

Network device number for each specific instance of device (optional if the development board does not support multiple instances of the specific device)

For example, the NetDev_WiFi_SPI_Lock() function for the #2 RS9110 wireless device on an Atmel AT91SAM9263-EK should be named NetDev_WiFi_RS9110_SPI_Lock2(), or NetDev_WiFi_RS9110_SPI_Lock_2() with additional underscore optional.

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