CODirRdLong
Description
This function reads a 32bit value from the given object directory. The object entry is addressed with the given key and the value will be written to the given destination pointer.
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The following example reads the current value of the hypothetical application specific object entry "[1234:56]" within the object directory of the CANopen node AppNode.
| Code Block |
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CPU_INT16S err;
CPU_INT32U value;
:
err = CODirRdLong (&(AppNode.Dir), CO_DEV(0x1234, 0x56), &value);
if (err != CO_ERR_NONE) {
/* object [1234:56] is missing or error during reading */
} else {
/* value holds the content of object [1234:56] */
}
: |
Note: This function uses CODirFind() on each function call. To improve access performance for multiple accesses to a single object entry, the application may use CODirFind() once and COObjRdValue() multiple times.