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modbus: add DE/nRE gpios properties to samples and test

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Add DE/nRE gpios properties to samples and test.

Signed-off-by: Johann Fischer <johann.fischer@nordicsemi.no>
This commit is contained in:
Johann Fischer 2020-12-22 23:59:43 +01:00 • committed by Carles Cufí
commit d0ff35b88d
5 changed files with 18 additions and 8 deletions
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13
samples/subsys/modbus/rtu_client/README.rst
View file

@ -19,12 +19,15 @@ RTU client example is running on an evaluation board and communicates
with another board that has been prepared according to the description
`modbus-rtu-server-sample`.
In addition to the evaluation board, an USB to RS-485 bus adapter and
a RS-485 shield are required. Shield converts the UART TX, RX signals to
RS-485 and does not need a specific overlay, an Arduino header compatible
shield like `joy-it RS-485 shield for Arduino`_ can be used.
In addition to the evaluation board a RS-485 shield may be used.
The shield converts UART TX, RX signals to RS-485.
An Arduino header compatible shield like `joy-it RS-485 shield for Arduino`_
can be used. This example uses DE signal, which is controlled by pin D9
on the JOY-IT shield. For other shields, ``de-gpios`` property must be adapted
or removed in the application overlay file
:zephyr_file:`samples/subsys/modbus/rtu_client/app.overlay`
The A+, B- lines of the RS-485 shield should be connected together.
The A+, B- lines of the RS-485 shields should be connected together.
Alternatively UART RX,TX signals of two boards can be connected crosswise.

1
samples/subsys/modbus/rtu_client/app.overlay
View file

@ -11,5 +11,6 @@
compatible = "zephyr,modbus-serial";
label = "MODBUS";
status = "okay";
de-gpios = <&arduino_header 15 GPIO_ACTIVE_LOW>; /* D9 */
};
};

9
samples/subsys/modbus/rtu_server/README.rst
View file

@ -19,9 +19,12 @@ Additionally the board should have three LEDs.
RTU server example is running on an evaluation board. Client is running
on a PC or laptop.
In addition to the evaluation board, an USB to RS-485 bus adapter and
a RS-485 shield are required. Shield converts the UART TX, RX signals to
RS-485 and does not need a specific overlay, an Arduino header compatible
shield like `joy-it RS-485 shield for Arduino`_ can be used.
a RS-485 shield are required. The shield converts UART TX, RX signals to RS-485.
An Arduino header compatible shield like `joy-it RS-485 shield for Arduino`_
can be used. This example uses DE signal, which is controlled by pin D9
on the JOY-IT shield. For other shields, ``de-gpios`` property must be adapted
or removed in the application overlay file
:zephyr_file:`samples/subsys/modbus/rtu_server/app.overlay`
The USB to RS-485 adapter connects to the USB port of a computer.
The two A+, B- lines should be connected to the RS-485 shield.

1
samples/subsys/modbus/rtu_server/app.overlay
View file

@ -11,5 +11,6 @@
compatible = "zephyr,modbus-serial";
label = "MODBUS";
status = "okay";
de-gpios = <&arduino_header 15 GPIO_ACTIVE_LOW>; /* D9 */
};
};

2
tests/subsys/modbus_rtu/boards/frdm_k64f.overlay
View file

@ -11,6 +11,8 @@
compatible = "zephyr,modbus-serial";
label = "MODBUS";
status = "okay";
de-gpios = <&gpiob 22 GPIO_ACTIVE_LOW>; /* red LED */
re-gpios = <&gpioe 26 GPIO_ACTIVE_LOW>; /* green LED */
};
};