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Update documentation.

This commit is contained in:
Martin Ling 2013-11-03 22:30:46 +00:00 committed by Uwe Hermann
parent e3b2f7a4e3
commit 0161932884
1 changed files with 28 additions and 7 deletions
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35
README
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@ -67,7 +67,7 @@ port. This structure is obtained from the array returned by sp_list_ports().
All functions can return only three possible error values. SP_ERR_ARG indicates
the function was called with invalid arguments. SP_ERR_FAIL indicates that the
OS reported a failure. SP_ERR_MEM indicates that a memory allocation failed.
Aoth these error values are negative.
All of these error values are negative.
When SP_ERR_FAIL is returned, an error code or string description of the error
can be obtained by calling sp_last_error_code() or sp_last_error_message(). The
@ -82,15 +82,36 @@ The available functions are as follows:
Enumeration
-----------
struct sp_port **sp_list_ports();
int sp_get_port_by_name(const char *portname, struct sp_port **port_ptr);
Lists the serial ports available on the system. The value returned is an array
of pointers to sp_port structures, terminated by a NULL. It should be freed after
use by calling sp_free_port_list().
Obtains a pointer to a new sp_port structure representing the named port. The
user should allocate a variable of type "struct sp_port *" and pass a pointer
to this to receive the result.
Returns: SP_OK on success, SP_ERR_FAIL on failure, SP_ERR_MEM on allocation failure,
or SP_ERR_ARG if an invalid pointer is passed. If any error is returned,
the value pointed to by port_ptr will be set to NULL.
void sp_free_port(struct sp_port *port);
Frees a port structure obtained from sp_get_port_by_name().
int sp_list_ports(struct sp_port ***list_ptr);
Lists the serial ports available on the system. The result obtained is an
array of pointers to sp_port structures, terminated by a NULL. The user should
allocate a variable of type "struct sp_port **" and pass a pointer to this to
receive the result.
The result should be freed after use by calling sp_free_port_list().
Returns: SP_OK on success, SP_ERR_FAIL on failure, SP_ERR_MEM on allocation failure,
or SP_ERR_ARG if an invalid pointer is passed. If any error is returned,
the value pointed to by list_ptr will be set to NULL.
void sp_free_port_list(struct sp_port **list);
Frees the data structure returned by sp_list_ports().
Frees a port list obtained from sp_list_ports().
Opening and closing ports
-------------------------
@ -106,7 +127,7 @@ int sp_open(struct sp_port *port, int flags);
flags are: SP_MODE_RDWR, SP_MODE_RDONLY, and SP_MODE_NONBLOCK.
Returns: SP_OK on success, SP_ERR_FAIL on failure, or SP_ERR_ARG
if an invalid port or name is passed.
if an invalid port is passed.
int sp_close(struct sp_port *port);