Unit W1
From Ultibo.org
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Description
Ultibo 1-Wire Interface unit
1-Wire is a communications bus designed by Dallas Semiconductor Corp that combines low speed signalling, data and power over a single signal line. It is often used for small devices such as digital thermometers.
Devices can actually be powered over the 1-Wire interface allowing the use of just data and ground lines.
Note: Because FreePascal does not permit the use of functions or variables that begin with a numeric value such as 1WIRE we use the term W1 throughout this unit to refer to a 1-Wire device. This is the same terminology as used in Linux and other systems.
Constants
W1 specific constants
W1_* W1_NAME_PREFIX = '1WIRE';
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Name prefix for 1-Wire Devices |
W1 device types
W1_TYPE_* W1_TYPE_NONE = 0;
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W1 device states
W1_STATE_* W1_STATE_DISABLED = 0;
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W1_STATE_ENABLED = 1;
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W1 device flags
W1_FLAG_* W1_FLAG_NONE = $00000000;
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W1 logging
W1_LOG_* W1_LOG_LEVEL_DEBUG = LOG_LEVEL_DEBUG;
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W1 debugging messages |
W1_LOG_LEVEL_INFO = LOG_LEVEL_INFO;
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W1 informational messages, such as a device being attached or detached |
W1_LOG_LEVEL_WARN = LOG_LEVEL_WARN;
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W1 warning messages |
W1_LOG_LEVEL_ERROR = LOG_LEVEL_ERROR;
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W1 error messages |
W1_LOG_LEVEL_NONE = LOG_LEVEL_NONE;
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No W1 messages |
Type definitions
W1 properties
PW1Properties = ^TW1Properties;
TW1Properties = record
Flags:LongWord;
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Device flags (eg W1_FLAG_????) |
W1 enumeration callback
TW1Enumerate = function(W1:PW1Device; Data:Pointer):LongWord;
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W1 notification callback
TW1Notification = function(Device:PDevice; Data:Pointer; Notification:LongWord):LongWord;
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W1 device get properties
TW1DeviceGetProperties = function(W1:PW1Device; Properties:PW1Properties):LongWord;
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W1 device
PW1Device = ^TW1Device;
TW1Device = record
| Device Properties | |
Device:TDevice;
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The Device entry for this W1 |
| W1 Properties | |
W1Id:LongWord;
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Unique Id of this W1 in the W1 table |
W1State:LongWord;
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W1 state (eg W1_STATE_ENABLED) |
DeviceGetProperties:TW1DeviceGetProperties;
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A Device specific DeviceGetProperties method implementing the standard W1 device interface (Or nil if the default method is suitable) |
| Statistics Properties | |
| Driver Properties | |
Lock:TMutexHandle;
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Device lock |
Properties:TW1Properties;
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Device properties |
| Internal Properties | |
Prev:PW1Device;
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Previous entry in W1 table |
Next:PW1Device;
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Next entry in W1 table |
Public variables
W1 logging
W1_DEFAULT_LOG_LEVEL:LongWord = W1_LOG_LEVEL_DEBUG;
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Minimum level for W1 messages. Only messages with level greater than or equal to this will be printed. |
W1_LOG_ENABLED:Boolean;
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Function declarations
Initialization functions
procedure W1Init;
Description: Initialize the W1 unit and W1 device table
| Note | Called only during system startup |
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W1 functions
function W1DeviceGetProperties(W1:PW1Device; Properties:PW1Properties):LongWord;
Description: Get the properties for the specified W1 device
| W1 | The W1 device to get properties from |
|---|---|
| Properties | Pointer to a TW1Properties structure to fill in |
| Return | ERROR_SUCCESS if completed or another error code on failure |
function W1DeviceCreate:PW1Device;
Description: Create a new W1 entry
| Return | Pointer to new W1 entry or nil if W1 could not be created |
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function W1DeviceCreateEx(Size:LongWord):PW1Device;
Description: Create a new W1 entry
| Size | Size in bytes to allocate for new W1 (Including the W1 entry) |
|---|---|
| Return | Pointer to new W1 entry or nil if W1 could not be created |
function W1DeviceDestroy(W1:PW1Device):LongWord;
Description: Destroy an existing W1 entry
| Note | None documented |
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function W1DeviceRegister(W1:PW1Device):LongWord;
Description: Register a new W1 in the W1 table
| Note | None documented |
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function W1DeviceDeregister(W1:PW1Device):LongWord;
Description: Deregister a W1 from the W1 table
| Note | None documented |
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function W1DeviceFind(W1Id:LongWord):PW1Device;
Description: To be documented
| Note | None documented |
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function W1DeviceFindByName(const Name:String):PW1Device; inline;
Description: To be documented
| Note | None documented |
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function W1DeviceFindByDescription(const Description:String):PW1Device; inline;
Description: To be documented
| Note | None documented |
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function W1DeviceEnumerate(Callback:TW1Enumerate; Data:Pointer):LongWord;
Description: To be documented
| Note | None documented |
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function W1DeviceNotification(W1:PW1Device; Callback:TW1Notification; Data:Pointer; Notification,Flags:LongWord):LongWord;
Description: To be documented
| Note | None documented |
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W1 helper functions
function W1GetCount:LongWord;
Description: Get the current W1 count
| Note | None documented |
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function W1DeviceGetDefault:PW1Device;
Description: Get the current default W1 device
| Note | None documented |
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function W1DeviceSetDefault(W1:PW1Device):LongWord;
Description: Set the current default W1 device
| Note | None documented |
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function W1DeviceCheck(W1:PW1Device):PW1Device;
Description: Check if the supplied W1 is in the W1 table
| Note | None documented |
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procedure W1Log(Level:LongWord; W1:PW1Device; const AText:String);
Description: To be documented
| Note | None documented |
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procedure W1LogInfo(W1:PW1Device; const AText:String); inline;
Description: To be documented
| Note | None documented |
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procedure W1LogWarn(W1:PW1Device; const AText:String); inline;
Description: To be documented
| Note | None documented |
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procedure W1LogError(W1:PW1Device; const AText:String); inline;
Description: To be documented
| Note | None documented |
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procedure W1LogDebug(W1:PW1Device; const AText:String); inline;
Description: To be documented
| Note | None documented |
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