Linux C_SDK_Normal Onboard serial port and 3-in-1 serial port usage tutorial

Applicable Model

WT61

WT61P

WT901

WT901B

WT931

Routine download

https://github.com/WITMOTION/WitStandardProtocol_JY901

Operation steps of onboard serial port

1. View serial port mapping

ls -l /dev/ttyserial*

If the following two situations occur: Step 2 configuration is required

case one：

case two：

1. Map ttyAMA0 to serial0

method one：

① Click on the raspberry logo in the upper left corner -> Preferences ->Raspberry Pi Configuration

② click “Interfaces”

③ After checking the Serial Port option, click “OK”

as follows：

④ Click “yes” to restart the Raspberry Pi

Method Two：

① Press and hold ctrl+Alt+T to open the terminal

② Command line input：

sudo raspi-config

The following interface appears, select Interface Options and press Enter

③Select I6 Serial Port and press Enter

④ Select <No>, press Enter

⑤ Select <Yes> and press Enter

⑥ After the following interface appears, select <Ok>, and then press the Esc key to exit the page

⑦ Reboot Raspberry Pi

reboot

1. Check whether the serial port is mapped successfully

ls -l /dev/serial*

As can be seen from the above figure, serial0 is mapped to ttyAMA0 after configuration, indicating that the configuration is successful.

1. hardware connection

2. Wiring problem (this example uses Raspberry Pi 3b+ as an example)

• Find the pinout diagram of the Raspberry Pi model you are using

② Wiring

Raspberry Pi 3b+ JY901S (Virt smart sensor supporting Normal protocol)

5V-DC Power <--------------------------> VCC

GPIO14(TXD0) <--------------------------> RXD

GPIO15(RXD0) <--------------------------> TXD

Ground <--------------------------> GND

1. Enter the specified folder to compile and run the program

cd ~/linux_sdk cd ./normal gcc ./*.c ./a.out /dev/ttyAMA0

1. Check the running results

• The prompt message and the number of sensor parameters returned

• Shake the sensor, the parameters of the sensor will be sent back and displayed in real time, indicating that the debugging is successful！

Operation steps of 3-in-1 serial port

1. Wiring

• Prepare a Wit-miotion sensor and 3-in-1 serial port that support the Normal protocol

JY901S 3-in-1

VCC <----------------------------------------> VCC

TX <----------------------------------------> RX

RX <----------------------------------------> TX

GND <----------------------------------------> GND

1. View the serial port file under the device file

ls -l /dev/ttyUSB*

Plug the 3-in-1 into the serial port of the Raspberry Pi, and enter the above command again: ls -l /dev/ttyUSB*

The extra serial port file is the serial port file we are looking for (ttyUSB0)

1. Enter the specified folder to compile and run the program

cd ~/linux_sdk cd ./normal gcc ./*.c ./a.out /dev/ttyUSB0

1. Check the running results

• Prompt information and returned sensor parameter data

• Shake the sensor, the parameters of the sensor will be sent back and displayed in real time, indicating that the debugging is successful!

More

For other operations, please refer to the sensor manual