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| − | |Регистр чтения показаний температуры: | + | |Регистр чтения показаний температуры: sign (0 = above zero; 1 = below zero) |
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| − | |style="padding-left:0.5em;"| | + | |style="padding-left:0.5em;"|the temperature measured by the sensor is above zero; |
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| − | |style="padding-left:0.5em;"| | + | |style="padding-left:0.5em;"|the temperature measured by the sensor is below zero. |
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| − | |valign="top" style="padding-left:0.5em;"|'' | + | |valign="top" style="padding-left:0.5em;"|''Note:'' |
| − | |valign="top" style="padding-left:0.5em;"|'' | + | |valign="top" style="padding-left:0.5em;"|''When receiving in DS18X20 mode, temperature sensor duty cycle, those send requests via Dallas transmission start register, should not be less than 750ms.'' |
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| − | + | Example of a functional diagram to work with temperature sensor DS18X20. | |
[[File:6_12_2_2.png|center]] | [[File:6_12_2_2.png|center]] | ||
| − | + | 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 == | == See also == | ||
Revision as of 05:20, 20 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.
Registers 1-Wire driver
Below is a description of the 1-Wire driver operation control registers.
Registers 1-Wire driver configuration.
To activate the 1-Wire driver, need to select the controller channel number connected to 1-Wire bus, in the appropriate driver register.
| Note: | At any given time, the driver can work with only one of the connected 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 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. |
Example of channel #5 configuration to use with a temperature sensor DS18X20.
1-Wire driver configuration registers.
| Адрес | Expected values | ||||||
|---|---|---|---|---|---|---|---|
| Dallas configuration register |
| ||||||
| Dallas channel number register |
|
The channel configuration for operation in this mode is set by the following named constants:
| Parameter | List of expected values |
|---|---|
| 1-Wire device type | DS18X20 temperature sensor, CP-Z reader in the DS1990A emulation mode, DS1990A reader |
1-Wire transmit registers.
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.
| Address | Expected values | ||||||
|---|---|---|---|---|---|---|---|
| Dallas start transmission register |
| ||||||
| The setup registers of Dallas 64-bit transmission destination ROM-code SN0:FC |
| ||||||
| The setup registers of Dallas 64-bit transmission destination ROM-code SN2:SN1 |
| ||||||
| The setup registers of Dallas 64-bit transmission destination ROM-code SN4:SN3 |
| ||||||
| The setup registers of Dallas 64-bit transmission destination ROM-code CRC:SN5 |
|
| Note: | 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. |
1-Wire driver receive registers .
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.
General reception registers.
| Address | Return values | ||||||
|---|---|---|---|---|---|---|---|
| Register the presence of the received data Dallas |
|
Reception in CZP / DS1990A mode.
| Address | Return values | |||
|---|---|---|---|---|
| Регистр чтения 64-битного ROM-кода устройства Dallas SN0:FC |
| |||
| Регистр чтения 64-битного ROM-кода устройства Dallas SN2:SN1 |
| |||
| Регистр чтения 64-битного ROM-кода устройства Dallas SN4:SN3 |
| |||
| Регистр чтения 64-битного ROM-кода устройства Dallas CRC:SN5 |
|
Прием в режиме DS18X20.
| Адрес | Возвращаемые значения | ||||||
|---|---|---|---|---|---|---|---|
| Регистр чтения показаний температуры: целые градусы Цельсия |
| ||||||
| Регистр чтения показаний температуры: десятитысячные доли градуса Цельсия |
| ||||||
| Регистр чтения показаний температуры: sign (0 = above zero; 1 = 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.
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.
