pointer to struct argument

[nhutchin]

Can anyone please explain what's wrong with the following:

In header file control.h I have prototype:-
/* Toggle relay */
int toggle_relay(relays *);

In source file tsc_ctrl.c I have:-
typedef struct {
int addr; /* Base Address for I/O */
int offset; /* Base offset */
int num; /* Relay number */
int state; /* ON/OFF */
int type; /* Valve; Switch; . . .*/
char label[20]; /* Device name e.g. LP_PUMP */
} relays;

relays relay[20];

When I compile this program I get the error message:-
In file included from tsc_ctrl.c:23:
control.h:34: error: parse error before '*' token

What is wrong with the prototype?
How do I pass a pointer to the type 'relays' to a function??

[darkrose0510]

looks like you're trying to use the type relays before declaring it.

[nhutchin]

looks like you're trying to use the type relays before declaring it.

looks like you're right, you clever person you!!! Thank you for that, much appreciated.
Can I propose you venture into re-writing compiler error messages?