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
Code Block |
---|
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
’.
...
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’sNetDev_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.
...