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 编译运行测试程序

启动开发板并运行Debian系统，进入系统后克隆Matrix代码仓库：

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

克隆完成后会得到一个名为matrix的目录。

编译并安装Matrix：

$ cd matrix
$ make && make install

运行测试程序：

$ matrix-rotary_encoder

注意：此模块并不支持热插拔，启动系统前需要确保硬件连接正确。
运行效果如下：

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

旋转模块时，能读到对应的值。

6 代码说明

所有的开发板都共用一套Matrix代码，本模块的测试示例代码为matrix-rotary_encoder，内容如下:

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;
}

API说明参考维基：Matrix API reference manual