The CALL statement is used to invoke a subroutine from another procedure. The called routine must be defined before it can be called.
The driver executes all statements of the called procedure and then resumes
Examples
The example below, taken from the Tandberg-Alteia device driver, shows a common application of a subroutine. The subroutine getAck is called every time the driver sent a command to the IRD to check if the unit accepted the command.
// called after sending a command to the IRD. checks the ACK response which is
// expected.
//
PROC SUBROUTINE getAck
INPUT "=" TRM "_" internal.ack
IF internal.ack = "ACK" GOTO endif
SET faults.commstat = "ACK expected"
SET faults.99 = "true"
:endif