_SKU_DFR0420_Audio_Shield_for_DFRduino_M0 - jimaobian/DFRobotWikiCn GitHub Wiki

Audio Shield for DFRduino M0

简介

DFRduino M0专用音频扩展板,使用Wolfson新近推出WM8978全功能音频处理器,带有一个HI-FI级数字信号处理内核,支持增强3D硬件环绕音效,以及5频段的硬件均衡器,可以有效改善音质;并有一个可编程的陷波滤波器,用以去除屏幕开、切换等噪音。

归功于DFRduino M0丰富的硬件资源,我们终于可以把这款HiFi级codec芯片移植到Arduino平台上。无需串口MP3模块,就可以实现双声道放音,SD卡存储,单声道录音,双声道3W功放等功能。节省了串口资源,使用更加的灵活和方便,自由地掌控音频功能。

DFRduino M0 音频扩展板采用标准音频IIS接口,板载MIC,并预留麦克分接口,支持外部音源输入,预留左右声道接口,可以外接耳机或者喇叭。

产品参数

  • 工作电压:5V
  • 最大工作电流:2A
  • DFRduino M0 shield封�
  • 输入接口:Linein & MIC
  • 输出接口:Lineout & Speaker
  • 尺寸 55mm*53mm
  • 重量 26g

引脚说明

| | | | ------------------------------------------------------------------------------------- | | | Audio Shield for DFRduino M0 | |

标号 名称 功能描述
1 linein linein
2 lineout lineout
3 sdcard sd卡插槽
4 SPEAK_L 左声道功放输出
5 SPEAK_R 右声道功放输出

表名

使用教程

教程1——wav音频播放

准备

  • 硬件
    • DFRduino M0 Mainboard x1
    • Audio Shield for DFRduino M0 x1
    • 3.5mm接口耳机或者3W喇叭
    • 已经格式化为FAT格式的SD卡一张(当前不支持exFAT,请使用FAT16或者FAT32进行格式化)
  • 软件

样例代码

|


#include <SPI.h>
#include <Wire.h>
#include <SD.h>
#include <WAV.h>

// set up variables using the SD utility library functions:
Sd2Card card;

///< assign sd card chipselect pin
const int chipSelect = 30;
void setup()
{
    // Open serial communications and wait for port to open:
    Serial.begin(115200);
    while (!Serial) {
      ; // wait for serial port to connect. Needed for Leonardo only
    }

    while(1){
        Serial.print("\nInitializing SD card...");

        // we'll use the initialization code from the utility libraries
        // since we're just testing if the card is working!
        if (!card.init(SPI_HALF_SPEED, chipSelect)) {
            Serial.println("initialization failed. Things to check:");
            Serial.println("* is a card inserted?");
            Serial.println("* is your wiring correct?");
            Serial.println("* did you change the chipSelect pin to match your shield or module?");
            delay(2000);
            continue;
        } else {
            Serial.println("Wiring is correct and a card is present.");
            if (!SD.begin(chipSelect)) {
                Serial.println("Card failed, or not present");
                delay(2000);
                continue;
            }
            break;
        }
    }
}

void loop()
{
    int ret;
    //assign music file and trigger transport dma
    wav.play("test.wav");
    do{
        //We must continue to decode to provide data to the player
        ret = wav.decode();
       //user code

    }while(ret == WAV_DECODING);

    while(1);
}

|}

使用方法

  1. 将您的音频转化为wav格式(名称可自定义,样例代码使用test.wav),放入SD卡根目录下(文件夹内无法识别)
  2. 将SD卡插入SD卡槽中,注意:SD的存储格式必须为FAT
  3. 插上喇叭或者耳机
  4. 烧入样例代码后,打开串口助手自动放音

教程2——wav音频录制

准备

  • 硬件
    • DFRduino M0 Mainboard x1
    • Audio Shield for DFRduino M0 x1
    • 3.5mm接口耳机
    • 已经格式化为FAT格式的SD卡一张(当前不支持exFAT,请使用FAT16或者FAT32进行格式化)
  • 软件

样例代码

|

#include <SPI.h>
#include <Wire.h>
#include <SD.h>
#include <WAV.h>

// set up variables using the SD utility library functions:
Sd2Card card;

const int chipSelect = 30;  ///< assign sd card chipselect pin

void setup()
{
    // Open serial communications and wait for port to open:
    Serial.begin(115200);
    while (!Serial) {
        ; // wait for serial port to connect. Needed for Leonardo only
    }

    while(1){
        Serial.print("\nInitializing SD card...");

        // we'll use the initialization code from the utility libraries
        // since we're just testing if the card is working!
        if (!card.init(SPI_HALF_SPEED, chipSelect)) {
            Serial.println("initialization failed. Things to check:");
            Serial.println("* is a card inserted?");
            Serial.println("* is your wiring correct?");
            Serial.println("* did you change the chipSelect pin to match your shield or module?");
            delay(2000);
            continue;
        } else {
            Serial.println("Wiring is correct and a card is present.");
            if (!SD.begin(chipSelect)) {
                Serial.println("Card failed, or not present");
                delay(2000);
                continue;
            }
            break;
        }
    }
}

void loop()
{
    int ret;
    ret = wav.record("rec.wav");
    unsigned int start = millis();
    while(ret == WAV_ENCODING){
        ret = wav.encode();
        if(millis() - start > 5000){
            wav.stop();
            ret = WAV_ENCODE_END;
        }
    };
    while(1);
}

|}

结果

烧入样例代码后开始录音,5秒后停止录音,录音文件:REC.wav。

常见问题

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