Pi byDreamy postedDec 27, 2016

SD Memory 카드 SPI 3.3V/5.0V 인터페이스 모듈 Atmega2560 제어 예제

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http://www.jkelec.co.kr/img/parts/sd_atmega2560.html

1. Atmega2560 Rabbit 개발보드와 연결 실험

(1) Atmega2560 Rabbit 개발보드와 SPI 인터페이스로 연결 합니다.

전원은 3.3V/5V 모두 사용가능 합니다.

(2) 제어 소스(ATMEGA2560 Avrstudio 4.14 Build589 프로젝트 소스 다운로드 )

FAT32형식의 SD메모리의 디렉토리와 파일을 읽어서 UART를 통해서 Display 해주는 예제 입니다.

SPI_SCK_PIN_NO --> PB1
SPI_MOSI_PIN_NO --> PB2
SPI_MISO_PIN_NO --> PB3
SPI_CS_PIN_NO --> PB0

#include "hw_config.h"
#include "led.h"
#include "uart.h"
#include "mmc_sd.h"
#include "diskio.h"
#include "ff.h"

static FATFS fs;            // Work area (file system object) for logical drive
static char path[20] = {""};
static DIR dirs;
static FILINFO finfo;

void sd_file_list(void)
{
  u32 sd_size;
  char tx_data[16];


  if( disk_initialize(0) == 0 )
    usart0_puts("\r\nsd initialize success.\r\n");
  else
    usart0_puts("\r\nsd initialize failed.\r\n");

#if 1


  f_mount(0,&fs);

  usart0_puts("\r\nf_mount()\r\n");

  if (f_opendir (&dirs, path) == FR_OK)
    {
      usart0_puts("\r\nf_opendir()\r\n");
        while (f_readdir (&dirs, &finfo) == FR_OK)
      {
        usart0_puts("\r\nf_readdir()\r\n");
      usart0_format_puts ("\r\n%s", finfo.fname);
          if (!(finfo.fattrib & AM_DIR))
          {

              if (!finfo.fname[0])
              {
                usart0_puts("\r\nfinfo.fname\r\n");
                  break;

        }
              usart0_format_puts ("\r\n%s", finfo.fname);
          }
        }



  }
#endif
  sd_size = SD_GetCapacity();

#ifdef USE_AVR_STUDIO
  ultoa( sd_size, tx_data, 10);
#else
  ultoa( tx_data, sd_size, 10);
#endif
  usart0_format_puts("\r\nCapacity=%s Bytes\r\n", tx_data);
}

void main(void)
{

  CLI();  // all interrupt disable

  bsp_led_gpio_init();

#if 1
  bsp_usart0_gpio_init();


  if( F_CPU == 8000000UL )
  {
    bsp_usart0_init(F_CPU, EBaud38400, EData8, EParNone, EStop1, FALSE );
  }
  else
  {
    bsp_usart0_init(F_CPU, EBaud115200, EData8, EParNone, EStop1, FALSE );
  }

  init_usart0_buffer();

  bsp_usart0_interrupt_enable();

  SEI();  // all interrupt enable

  bsp_led_core_on(ledUserCore);

  sd_file_list();
#endif

  //bsp_led_core_on(ledUserCore);

  while( 1 )
  {
    _delay_ms(10);
  }

  return;
}

Simple Audio Player 예제

https://www.arduino.cc/en/Tutorial/SimpleAudioPlayer

/*
  Simple Audio Player

 Demonstrates the use of the Audio library for the Arduino Due

 Hardware required :
 * Arduino shield with a SD card on CS4
 * A sound file named "test.wav" in the root directory of the SD card
 * An audio amplifier to connect to the DAC0 and ground
 * A speaker to connect to the audio amplifier

 Original by Massimo Banzi September 20, 2012
 Modified by Scott Fitzgerald October 19, 2012
 Modified by Arturo Guadalupi December 18, 2015

 This example code is in the public domain

 http://www.arduino.cc/en/Tutorial/SimpleAudioPlayer

*/

#include <SD.h>
#include <SPI.h>
#include <Audio.h>

void setup() {
  // debug output at 9600 baud
  Serial.begin(9600);

  // setup SD-card
  Serial.print("Initializing SD card...");
  if (!SD.begin(4)) {
    Serial.println(" failed!");
    while(true);
  }
  Serial.println(" done.");
  // hi-speed SPI transfers

  // 44100kHz stereo => 88200 sample rate
  // 100 mSec of prebuffering.
  Audio.begin(88200, 100);
}

void loop() {
  int count = 0;

  // open wave file from sdcard
  File myFile = SD.open("test.wav");
  if (!myFile) {
    // if the file didn't open, print an error and stop
    Serial.println("error opening test.wav");
    while (true);
  }

  const int S = 1024; // Number of samples to read in block
  short buffer[S];

  Serial.print("Playing");
  // until the file is not finished
  while (myFile.available()) {
    // read from the file into buffer
    myFile.read(buffer, sizeof(buffer));

    // Prepare samples
    int volume = 1024;
    Audio.prepare(buffer, S, volume);
    // Feed samples to audio
    Audio.write(buffer, S);

    // Every 100 block print a '.'
    count++;
    if (count == 100) {
      Serial.print(".");
      count = 0;
    }
  }
  myFile.close();

  Serial.println("End of file. Thank you for listening!");
  while (true) ;
}

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