Matrix - Rotary Encoder

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1 Introduction

File:Matrix-Rotary Encoder.png

2 Features

• Pin Description:

Pin	Description

4 Applications

4.1 Connect to NanoPi M1

Refer to the following connection diagram to connect the module to the NanoPi M1:
Matrix-Rotary_Encoder_nanopi_m1

Connection Details:

Matrix-Rotary_Encoder	NanoPi M1
R	Pin7
G	Pin8
B	Pin10
V	Pin4
G	Pin6

4.2 Connect to NanoPi 2

Refer to the following connection diagram to connect the module to the NanoPi 2:
Matrix-Rotary_Encoder_nanopi_2

Connection Details:

Matrix-Rotary_Encoder	NanoPi 2
R	Pin7
G	Pin8
B	Pin10
V	Pin4
G	Pin6

4.3 Connect to NanoPi M2 / NanoPi 2 Fire

Refer to the following connection diagram to connect the module to the NanoPi M2/ NanoPi 2 Fire:
Matrix-Rotary_Encoder_nanopi_m2

Connection Details:

Matrix-Rotary_Encoder	NanoPi M2
R	Pin7
G	Pin8
B	Pin10
V	Pin4
G	Pin6

4.4 Connect to NanoPC-T2

Refer to the following connection diagram to connect the module to the NanoPC-T2:
Matrix-Rotary_Encoder_NanoPC-T2

Connection Details:

Matrix-Rotary_Encoder	NanoPC-T2
R	Pin15
G	Pin16
B	Pin17
V	Pin29
G	Pin30

5 Compile & Run Test Program

Boot your ARM board with Debian and copy the matrix code:

$ apt-get update && apt-get install git
$ git clone https://github.com/friendlyarm/matrix.git

If your cloning is done successfully a "matrix" directory will be generated.

Compile and install Matrix:

$ cd matrix
$ make && make install

Run test program:

$ matrix-rotary_encoder

Note: this module is not plug and play therefore before running the module please make sure it is connected to an ARM board.
Here is what you should observe:

Get sw=0 value=1
Get sw=0 value=2
Get sw=0 value=3
Get sw=0 value=4
Get sw=0 value=5

Rotating this module will trigger events and generate values.

6 Code Sample

This Matrix code sample can work with all the ARM boards mentioned in this module's wiki. The name of this code sample is "matrix-rotary_encoder". Here is its source code:

int main(int argc, char ** argv) 
{ 
    int i = 0;
    int encoderSw = 0;
    int encoderValue = 0;
    int board;
    int swPin = GPIO_PIN(7);
    int siaPin = GPIO_PIN(8);
    int sibPin = GPIO_PIN(10);
 
    if ((board = boardInit()) < 0) {
        printf("Fail to init board\n");
        return -1;
    }
    if (board == BOARD_NANOPI_T2) {
        swPin = GPIO_PIN(15);
        siaPin = GPIO_PIN(16);
        sibPin = GPIO_PIN(17);
    }
    system("modprobe "DRIVER_MODULE);
    if (rotaryEncoderInit(swPin, siaPin, sibPin)) {
        printf("Fail to init rotary encoder\n");
        goto err;
    }
    signal(SIGINT, encoderHandler);
    for (i=0; i<ENCODER_READ_TIMES; i++) {
        rotaryEncoderRead(ENCODER_SW, &encoderSw);
        rotaryEncoderRead(ENCODER_VALUE, &encoderValue);
        printf("Get sw=%d value=%d\n", encoderSw, encoderValue);
        sleep(1);
    }
    rotaryEncoderDeInit();
err:
    system("rmmod "DRIVER_MODULE);
    return 0;
}

For more details about this APIs called in this code sample refer to Matrix API reference manual

8 Update Log

8.1 June-24-2016

• Created English wiki