Lock() / Unlock() - SPI BSP

Owned by Former user (Deleted)
Last updated: Mar 13, 2014 by Former user (Deleted)
1 min read
void  FSDev_BSP_SPI_Lock   (FS_QTY unit_nbr);
void  FSDev_BSP_SPI_Unlock (FS_QTY unit_nbr);

File

Called from

Code enabled by

fs_dev_<dev_name>_bsp.c

Device driver

N/A

Acquire/release SPI bus lock.

Arguments

unit_nbr

Unit number of device.

Returned Value

None.

Notes/Warnings

  1. Lock() will be called before the driver begins to access the SPI. The application should not use the same bus to access another device until the matching call to Unlock() has been made.
  2. The clock frequency set by the SetClkFreq() function is a parameter of the device, not the bus. If multiple devices are located on the same bus, those parameters must be saved (in memory) when set and restored by Lock(). The same should be done for initialization parameters such as transfer unit size and shift direction that vary from device to device.