Description:
Writes MAC registers to Flash memory
If Wait input is true the function returns when MAC 
 motor is ready, or timeout after 5 seconds max.
If Wait input is false the function returns as soon 
 as the Write flash command has been sent to the MAC motor.


It will try 3 times before returning Timeout.

Author    : Rune Rafn (Quickwood Automation) 8/1-2004
Supported : Target from version 0.0.0.10 and later.

Parameters:
Input:
PORTID    : ID from MAC_com_open function
MOTORADDR : Address of the MAC motor (Use 255 to broadcast)
WAIT      : Flag for waiting for Write flash. See description.
Output: 
READY     : Returns true if Write flash was successful or motor ready. Depend on WAIT flag.
STATUS    : Status for function block. See Status explanation 


Status explanation:
0 Done Write flash. If ready true, Write flash done.
1 Sending message.
2 Retransmitting to motor.
Following values are errors. Write flash attempt aborted 
 when error occurs. Motor is left in unknown state.
-1 Timeout. 
-2 Unknown error.
-3 Transmit error
-4 Error reading response.
-5 Unable to set MAC motor to safemode