Maxim-integrated 73M1822/73M1922 Hardware Module for SMDK412 Bedienungsanleitung PDF herunterladen (Seite 8)

73M1822/73M1922 Hardware Module for SMDK412 User Guide UG_1x22_054

8 Rev. 1.1

3.3 close

Description

A file descriptor obtained with an open() command must be subsequently released with a corresponding

close..

Prototype

int close (int fd);

Parameters

Data Type Name Description

int

File descriptor to close.

Return Values

Data Type Description

int

0 = Success.

-1 = Failure.

3.4 read

Description

A file descriptor obtained with an open() command can be called with the standard Linux read command

to obtain MAFE audio samples. The read command reads as many 16 bit samples into the user supplied

buffer as possible and return the amount of data that was copied.

Prototype

size_t read (int fd, void * buf, size_t buf_size);

Parameters

Data Type Name Description

int

File descriptor.

void *

buf

Buffer to read samples into.

size_t

buf_size

Maximum size of data that can be copied.

Return Values

Data Type Description

size_t

Amount of data that was actually copied.

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Maxim-integrated 73M1822/73M1922 Hardware Module for SMDK412 Bedienungsanleitung Seite 8