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Difference between revisions of "CANNY 7, Dallas 1-Wire Driver"

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|valign="top" style="padding-left:0.5em;"|''Note:''
 
|valign="top" style="padding-left:0.5em;"|''Note:''
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|valign="top" style="padding-left:0.5em;"|''To avoid losing data when working with several Dallas buses, perform switching between them only after receiving responses from the slaves requested by the controller and processing or saving the data.''
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|valign="top" style="padding-left:0.5em;"|''To avoid data loss, when working with several Dallas buses, perform switching between them only after receiving responses from the slaves requested by the controller and processing or saving the data.''
 
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Example of channel #5 configuration to use with a temperature sensor DS18X20.
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Example of channel #5 configured to work with a temperature sensor DS18X20.
  
 
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The channel configuration for operation in this mode is set by the following named constants:
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Channel configuration to operate in this mode is set by the following named constants:
 
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1-Wire transmit registers.
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Dallas 1-Wire® Request Registers.
  
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With the help of 1-Wire driver transmission registers , the user can specify the address of the respondent slave node and send a request for data transfer.  
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With the help of Dallas 1-Wire® driver request registers , the user can specify the address of respondent slave node and send a request for data transfer.  
  
 
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!Expected values
 
!Expected values
 
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|Dallas start transmission register
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|Dallas 1-Wire® Request To Send Register
 
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|The setup registers of Dallas 64-bit transmission destination ROM-code SN0:FC
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|Dallas 1-Wire® Requested Device ID RAW Data Register SN0:FC
 
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|The setup registers of Dallas 64-bit transmission destination ROM-code SN2:SN1
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|Dallas 1-Wire® Requested Device ID RAW Data Register SN2:SN1
 
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|The setup registers of Dallas 64-bit transmission destination ROM-code SN4:SN3
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|Dallas 1-Wire® Requested Device ID RAW Data Register SN4:SN3
 
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|The setup registers of Dallas 64-bit transmission destination ROM-code CRC:SN5
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|Dallas 1-Wire® Requested Device ID RAW Data Register CRC:SN5
 
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|valign="top" style="padding-left:0.5em;"|''Note:''
 
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|valign="top" style="padding-left:0.5em;"|''The setup registers of Dallas 64-bit transmission destination ROM-code is only used to select a device on the 1-Wire bus by its unique number (ROM-code), in case of multiple devices connected to the same bus. During operation with a single device on the bus, when it ROM- code unknown, set "0" value into all registers of Dallas transmission destination ROM-code.''
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|valign="top" style="padding-left:0.5em;"|''The setup registers of Dallas 1-Wire® 64-bit transmission destination ROM-code is only used to select a device on the Dallas 1-Wire® bus by its unique number (ROM-code), in case of multiple devices connected to the same bus. During operation with a single device on the bus, when its ROM- code unknown, set "0" value into all registers of Dallas transmission destination ROM-code.''
 
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Dallas 1-Wire driver receive registers .
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Dallas 1-Wire® Receive Registers .
  
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In operation, upon receiption of responses from the slave devices to the controller requests, data, according to the 1-Wire driver configuration, stored in its corresponding receiving registers.
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During its operation, upon reception of responses from the slave devices to the controller data requests, according to Dallas 1-Wire® driver configuration, stored in its corresponding receiving registers.
  
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General reception registers.
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General receive registers.
  
 
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!Return values
 
!Return values
 
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|Register the presence of the received data  Dallas
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|Dallas 1-Wire® Data Set Ready Register
 
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|style="padding-left:0.5em;"|=
 
|style="padding-left:0.5em;"|=
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|style="padding-left:0.5em;"|successfully received data from the slave node and it is available in Dallas driver read registers;
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|style="padding-left:0.5em;"|successfully received data from the slave node and it is available in Dallas 1-Wire® driver read registers;
 
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|width="70px" style="padding-left:0.5em;"|0
 
|width="70px" style="padding-left:0.5em;"|0
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Reception in CZP / DS1990A mode.
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iButton® DS1990A Receive Mode Registers.
  
 
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!Return values
 
!Return values
 
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|Регистр чтения 64-битного ROM-кода устройства Dallas SN0:FC
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|Dallas 1-Wire® Received Raw Data Register D0:FC
 
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|Регистр чтения 64-битного ROM-кода устройства Dallas SN2:SN1
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|Dallas 1-Wire® Received Raw Data Register D2:D1
 
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|Регистр чтения 64-битного ROM-кода устройства Dallas SN4:SN3
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|Dallas 1-Wire® Received Raw Data Register D4:D3
 
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|Регистр чтения 64-битного ROM-кода устройства Dallas CRC:SN5
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|Dallas 1-Wire® Received Raw Data Register CRC:D5
 
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Прием в режиме DS18X20.
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DS18X20 Receive Mode Registers.
  
 
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!width="250px"|Адрес
 
!width="250px"|Адрес
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!Возвращаемые значения
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!Returning values
 
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|Регистр чтения показаний температуры: целые градусы Цельсия
 
|Регистр чтения показаний температуры: целые градусы Цельсия

Revision as of 03:42, 27 August 2016

General Description

Controller CANNY 7 can be used as a master node in a single-wire data network Dallas® 1-Wire®, while it has the ability to only send requests for data from slave devices.

Any of CANNY 7 input-output channels can be used to connect the controller to 1-Wire bus. At the same time, that channel must be externally pulled-up to 5V with resistor 3-7k Ohm. Consistently reassigning driver channels, it's possible to arrange up to 11 independent connections 1-Wire. Wherein device addressing and device handling by address is not available, therefore, in 1-Wire mode it is possible to connect only one SLAVE node at a time to controllers' channel.

Driver Dallas 1-Wire in its operation uses controller channels' resources, but has a higher priority than discrete input-output driver.Thus, upon activation Dallas 1-Wire driver, for channels involved in to its operation, change values in associated registers of discrete input-output driver will be ignored.

The slave must have a permanent, rather than parasitic power.

Dallas 1-Wire® driver

Below is a description of the Dallas 1-Wire® driver registers.

Dallas 1-Wire® driver configuration registers.

To activate Dallas 1-Wire® driver, you need to select the controller channel number connected to Dallas 1-Wire® bus, in the appropriate driver register.

Note: At any given time, the driver can work with only one of the connected Dallas 1-Wire® bus, when it is allowed to dynamically switch between buses in the implementation of the functional diagram.

Sent requests management to get information from the slaves and control receiving of their responses (sensors poll) is performed by appropriate registers of 1-Wire driver.

Note: To avoid data loss, when working with several Dallas buses, perform switching between them only after receiving responses from the slaves requested by the controller and processing or saving the data.

Example of channel #5 configured to work with a temperature sensor DS18X20.

6 12 2 1.png

Dallas 1-Wire® Setup Registers.

Address Expected values
Dallas 1-Wire® configuration register
1...65535 = driver activation and setting the device type (defined by a special constant of the constants directory);
0 = disconnect the channel from 1-Wire driver, return channel control to IO channels driver and allow status changing from the functional diagram.
Dallas 1-Wire® IO Channel Select register
0...10 = set the channel number used by the controller to work with Dallas 1-Wire® bus .


Channel configuration to operate in this mode is set by the following named constants:

Parameter List of expected values
Dallas 1-Wire® device type DS18X20 temperature sensor, CP-Z reader in the DS1990A emulation mode, DS1990A reader


Dallas 1-Wire® Request Registers.

With the help of Dallas 1-Wire® driver request registers , the user can specify the address of respondent slave node and send a request for data transfer.

Address Expected values
Dallas 1-Wire® Request To Send Register
1 = send a request for data to the slave;
0 = do not send a request for data to the slave.
Dallas 1-Wire® Requested Device ID RAW Data Register SN0:FC
0...65535 = register value: the lower part represent a device family identifier (FC), the upper part contains the first byte of the unique device address (SN0).
Dallas 1-Wire® Requested Device ID RAW Data Register SN2:SN1
0...65535 = register value: the lower part contains the 2nd byte of the unique device address (SN1), the upper part contains the 3rd byte of the unique device address (SN2).
Dallas 1-Wire® Requested Device ID RAW Data Register SN4:SN3
0...65535 = register value: the lower part contains the 4th byte of the unique device address (SN3), the upper part contains the 5th byte of the unique device address (SN4).
Dallas 1-Wire® Requested Device ID RAW Data Register CRC:SN5
0...65535 = register value: the lower part contains the 6th byte of the unique device address (SN5), the upper part contains ROM-code addressee checksum (CRC).
Note: The setup registers of Dallas 1-Wire® 64-bit transmission destination ROM-code is only used to select a device on the Dallas 1-Wire® bus by its unique number (ROM-code), in case of multiple devices connected to the same bus. During operation with a single device on the bus, when its ROM- code unknown, set "0" value into all registers of Dallas transmission destination ROM-code.


Dallas 1-Wire® Receive Registers .

During its operation, upon reception of responses from the slave devices to the controller data requests, according to Dallas 1-Wire® driver configuration, stored in its corresponding receiving registers.

General receive registers.

Address Return values
Dallas 1-Wire® Data Set Ready Register
1 = successfully received data from the slave node and it is available in Dallas 1-Wire® driver read registers;
0 = there is no actual data in the driver receive buffer.


iButton® DS1990A Receive Mode Registers.

Address Return values
Dallas 1-Wire® Received Raw Data Register D0:FC
0...65535 = значение регистра: младшая часть содержит идентификатор семейства ключа (FC), старшая часть содержит первый байт уникального адреса ключа (SN0).
Dallas 1-Wire® Received Raw Data Register D2:D1
0...65535 = значение регистра: младшая часть содержит второй байт уникального адреса ключа (SN1), старшая часть содержит третий байт уникального адреса ключа (SN2).
Dallas 1-Wire® Received Raw Data Register D4:D3
0...65535 = значение регистра: младшая часть содержит четвертый байт уникального адреса ключа (SN3), старшая часть содержит пятый байт уникального адреса ключа (SN4).
Dallas 1-Wire® Received Raw Data Register CRC:D5
0...65535 = значение регистра: младшая часть содержит шестой байт уникального адреса ключа (SN5), старшая часть содержит контрольную сумму ROM-кода ключа (CRC).


DS18X20 Receive Mode Registers.

Адрес Returning values
Регистр чтения показаний температуры: целые градусы Цельсия
0...125 = модуль целой части значения измеренной датчиком температуры.
Регистр чтения показаний температуры: десятитысячные доли градуса Цельсия
0...9999 = модуль десятичной части значения измеренной датчиком температуры.
Регистр чтения показаний температуры: sign (0 = above zero; 1 = below zero)
0 = the temperature measured by the sensor is above zero;
1 = the temperature measured by the sensor is below zero.
Note: When receiving in DS18X20 mode, temperature sensor duty cycle, those send requests via Dallas transmission start register, should not be less than 750ms.

Example of a functional diagram to work with temperature sensor DS18X20.

6 12 2 2.png

temperature sensor poll, connected to the channel #5, carried out 1 time per second. При получении данных от DS18X20, в регистре наличия принятых данных драйвера Dallas появляется значение «1» и данные из регистров чтения показаний температуры, с помощью D-триггеров, сохраняются в соответствующие именованные сети для дальнейшей обработки.

See also

CANNY 7

CANNY 7, I²C Driver

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