Add support for fs and ps to sr_parse_period.

[libsigrok.git] / backend.c

diff --git a/backend.c b/backend.c
index 840b1723df9fea38ee755e2ee4ada1a2a258d48d..4823044efce580dbc9d7a116f1eb46e63a84a389 100644 (file)
--- a/backend.c
+++ b/backend.c
@@ -19,6 +19,7 @@
  */
 
 #include <glib.h>
+#include "config.h" /* Needed for HAVE_LIBUSB_1_0 and others. */
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
@@ -39,10 +40,14 @@
  * <a href="http://sigrok.org/wiki/Input_output_formats">input/output
  * file formats</a>.
  *
- * @section sec_error_handling Error handling
+ * @section sec_api API reference
  *
- * libsigrok functions usually return @ref SR_OK upon success, or a negative
- * error code on failure.
+ * See the "Modules" page for an introduction to various libsigrok
+ * related topics and the detailed API documentation of the respective
+ * functions.
+ *
+ * You can also browse the API documentation by file, or review all
+ * data structures.
  *
  * @section sec_mailinglists Mailing lists
  *
@@ -59,11 +64,53 @@
  * <a href="http://sigrok.org/wiki/Libsigrok">sigrok.org/wiki/Libsigrok</a>
  */
 
+/**
+ * @file
+ *
+ * Initializing and shutting down libsigrok.
+ */
+
 /**
  * @defgroup grp_init Initialization
  *
  * Initializing and shutting down libsigrok.
  *
+ * Before using any of the libsigrok functionality, sr_init() must
+ * be called to initialize the library, which will return a struct sr_context
+ * when the initialization was successful.
+ *
+ * When libsigrok functionality is no longer needed, sr_exit() should be
+ * called, which will (among other things) free the struct sr_context.
+ *
+ * Example for a minimal program using libsigrok:
+ *
+ * @code{.c}
+ *   #include <stdio.h>
+ *   #include <libsigrok/libsigrok.h>
+ *
+ *   int main(int argc, char **argv)
+ *   {
+ *     int ret;
+ *     struct sr_context *sr_ctx;
+ *
+ *     if ((ret = sr_init(&sr_ctx)) != SR_OK) {
+ *             printf("Error initializing libsigrok (%s): %s.",
+ *                    sr_strerror_name(ret), sr_strerror(ret));
+ *             return 1;
+ *     }
+ *
+ *     // Use libsigrok functions here...
+ *
+ *     if ((ret = sr_exit(sr_ctx)) != SR_OK) {
+ *             printf("Error shutting down libsigrok (%s): %s.",
+ *                    sr_strerror_name(ret), sr_strerror(ret));
+ *             return 1;
+ *     }
+ *
+ *     return 0;
+ *   }
+ * @endcode
+ *
  * @{
  */