| Exaos Lee wrote: | The definition of mvme_read_value is as the following:unsigned int EXPRT mvme_read_value(MVME_INTERFACE * vme, mvme_addr_t vme_addr);
Read single data from VME bus. Useful for register access. See example in
mvme_open()
Parameters:
*vme VME structure
vme_addr source address (VME location).
Returns:
MVME_SUCCESS
Question: How to distinguish the status and value returned? Should the definition be something likeint EXPRT mvme_read_value(MVME_INTERFACE *mvme, mvme_addr_t vme_addr, unsigned int *var); |
This function is a shortcut when you want something like
printf("%d\n", mvme_read_value(...));
and you know that the status is ok. Without this function, you would need to define a variable
unsigned long d;
mvme_read_value(..., &d);
printf("%d\n", d);
so the above function is just a handy shortcut. If you want to see the status however, you can call the "normal" function mvme_read:
status = mvme_read(..., &d, adr, 4); |