The TMAutoOverDrive API call sets TMEX to automatically switch to Overdrive communication speed if the 1-Wire device, 1-Wire network and driver support it. This is done by doing all serial ROM searches at normal 1-Wire speeds and switching to Overdrive speeds when the device is accessed with TMAccess. Automatic Overdrive is selected if the ‘Mode’ is 1 and not selected if ‘Mode’ is 0. Under the following conditions the TMEX driver will switch to Overdrive:
The following conditions will switch the TMEX driver out of Overdrive if communication is currently in Overdrive due to TMAutoOverDrive:
short far pascal TMAutoOverDrive(
For a description of the above types, see the TMEX Type Descriptions.
Specifies the session handle returned from the API function TMExtendedStartSession that specifies the desired 1-Wire network port. This parameter is required by most TMEX API functions.
Specifies a pointer to a memory location that TMEX keeps all of the state information for the 1-Wire networks. This parameter is required by most TMEX API functions.
Specifies Auto-Overdrive mode that is to be selected. A Mode of 1 will indicate that Overdrive speed should be attempted whenever possible. A Mode of 0 will indicate that only normal communication speed should be used.
1 => Auto-overdrive mode set
<0 => TMEX Network Error Return Code