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S16A User’s Guide Input and Output
EDT, Inc. October, 1996 7
7. The -ls16a option to the compiler, to link the library file libs16a.a with your program
See the makefile and example programs provided for examples of compiling code using the library
routines.
DMA Library Routines
The DMA library provides a set of consistent routines across many of the EDT products, with simple yet
powerful ring-buffered DMA capabilities. Table 1, DMA Library Routines lists the general DMA library
routines. In addition, if driver-specific library routines exist, they can be found in a table thereafter.
The sections that follow describe the DMA library routines in alphabetical order.
Routine Description
s16a_open Opens the S16A for application access.
s16a_close Terminates access to the S16A and releases resources.
s16a_read Single, application-level buffer read from the S16A.
s16a_write Single, application-level buffer write to the S16A.
s16a_set_defaults Restores the driver and hardware to factory-specified default state.
s16a_configure_ring_buffers Configures the ring buffers.
s16a_buffer_addresses Returns addresses of ring buffers.
s16a_wait_for_buffer Blocks until specified buffers have completed.
s16a_wait_for_next_buffer Blocks until the next buffer completes.
s16a_check_next_buffer Checks whether next buffer is complete.
s16a_start_buffers Begins transfer from or to specified number of buffers.
s16a_cancel Shuts down the device as soon as possible, optionally resets it.
s16a_cancel_current Cancels the current DMA, moves pointers to the next.
s16a_stop_buffers Stops the interface after all buffers have completed.
s16a_done_count Return absolute (cumulative) number of completed buffers.
foi_parity_error Checks for parity error since last call.
Table 1. General DMA Library Routines