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Input and Output S16A User’s Guide
20 EDT, Inc. October, 1996
s16a_stop_buffers
Description
Stops DMA transfer after the current buffer has completed, whether DMA is occurring continuously or
noncontinuously. If DMA is continuous, also dismantles ring buffer mode and frees the resources it
consumed.
Syntax
int s16a_stop_buffers(S16aDev *s16a_p);
Arguments
s16a_p S16A device handle returned from s16a_open
Return
0 on success; –1 on error. If an error occurs, check the errno global variable for the error number.
s16a_wait_for_buffer
Description
Blocks until the specified buffer is returned from the driver.
Syntax
void *s16a_wait_buffers(S16aDev *s16a_p, int bufnum);
Arguments
s16a_p S16A device handle returned from s16a_open
bufnum buffer number for which to block. Completed buffers are numbered cumulatively starting
with 0 when the S16A is opened. (Thus, the allocated buffer number is the transferred
buffer number modulo the number of allocated buffers.)
NOTE: If you wait for all the buffers, the driver is left with none to use when this call
returns, and an overrun or underrun will occur.
Return
Address of last completed buffer on success; NULL on error. If an error occurs, check the errno global
variable for more information.