设为首页收藏本站
开启辅助访问 切换到宽版

 找回密码
 立即注册

QQ登录

只需一步，快速开始

热门： 51单片机 | 24小时必答区 | 单片机教程 | 单片机DIY制作 | STM32 | Cortex M3 | 模数电子 | 电子DIY制作 | 音响/功放 | 拆机乐园 | Arduino | 嵌入式OS | 程序设计

搜索
»论坛 › 嵌入式/单片机论坛 › 51单片机 › [转帖]用AT89C2051做的SD卡播放器
返回列表 发新帖
查看: 7590|回复: 6
收起左侧

[转帖]用AT89C2051做的SD卡播放器

[复制链接]
ID:3271 发表于 2011-1-18 13:47 | 显示全部楼层 |阅读模式

 

#include <reg52.h>
#include <INTRINS.H>
#include <MATH.H>
#include "LCD_3310.H"

#define uchar unsigned char
#define uint  unsigned int
#define ulong unsigned long

typedef unsigned char BYTE;
typedef unsigned short WORD;
typedef unsigned long DWORD;

typedef signed char CHAR;
typedef signed short SHORT;
typedef signed long LONG;

typedef unsigned char u8;
typedef unsigned short u16;
typedef unsigned long u32;
/************ 定义管脚 *************/
sbit DOUT = P3^0;  //SD卡数据输出
sbit CLK  = P3^1;  //SD卡时钟输入
sbit DIN  = P3^2;  //SD卡数据输入
sbit CS   = P3^3;  //SD卡片选使能


/************ 全局变量 ************/                                                                                                                       
uchar pbuf[64]; //数据缓冲区
pdata uchar pbuf2[64];
uchar p;        //播放缓冲区指针
uchar px;       //频谱显示的X坐标

code ulong Track[17] = 
{   //0x15000,0x58000   SD卡中各声音文件的首址，以后打算把这些数据放在SD卡的特定配置文件中再读入。
    0xd7800-0x8a00,0x76b800-0x8a00,0xedc000-0x8a00,0x1752800-0x8a00,0x1F08000-0x8a00,
    0x2569800-0x8a00,0x2EDB800-0x8a00,0x3480000-0x8a00,0x3BFA800-0x8a00,
    0x41EB000-0x8a00,0x48EF000-0x8a00,0x508A000-0x8a00,0x59AE800-0x8a00,
    0x60AF000-0x8a00,0x6878000-0x8a00,0x6DBE000-0x8a00,0x7525800-0x8a00,
};

/******* SD访问错误码的定义 *******/
#define INIT_CMD0_ERROR   0X01
#define INIT_CMD1_ERROR   0X02
#define READ_BLOCK_ERROR  0X03
#define WRITE_BLOCK_ERROR 0X04

/********* 通用延时函数 ***********/
void delay(uint i)
{
    while(i--);
}

/******** SD写入一个字节 **********/
void spi_write(uchar x)
{   //不采用循环结构是为了提高处理速度
    DIN = x & 0x80;
    CLK = 0;
    CLK = 1;
    DIN = x & 0x40;
    CLK = 0;
    CLK = 1;
    DIN = x & 0x20;
    CLK = 0;
    CLK = 1;
    DIN = x & 0x10;
    CLK = 0;
    CLK = 1;
    DIN = x & 0x08;
    CLK = 0;
    CLK = 1;
    DIN = x & 0x04;
    CLK = 0;
    CLK = 1;
    DIN = x & 0x02;
    CLK = 0;
    CLK = 1;
    DIN = x & 0x01;
    CLK = 0;
    CLK = 1;
}

/******* SD慢速写入一个字节 ********/
void spi_write_low_speed(uchar x)
{
    uchar i;
    for(i = 8; i; --i)
    {
        DIN = x & 0x80;
        x <<= 1;
        CLK = 0;
        delay(1);
        CLK = 1;
        delay(1);
    }
}

/*********** SD读入一字节 ***********/
uchar spi_read(void)
{   //利用51串口的同步移位功能，以达了最高的读度2MHz CLK
    RI = 0;
    while(RI == 0);
    return SBUF;
}

/******** SD慢速读入一字节 **********/
uchar spi_read_low_speed(void)
{
    uchar temp,i;
    for(i = 8; i; --i)
    {
        CLK = 0;
        delay(1);
        temp <<= 1;
        if(DOUT) temp++;
        CLK = 1;
        delay(1);
    }
    return temp;
}

/******** 发送一组SD命令 ************/
uchar write_cmd(uchar data *pcmd)
{
    uchar temp,time=0,i;
    for(i = 0; i<6; i++) //一条命令都是6个字节，形参用指针，
    {                    //指向6个字节命令，
        spi_write(pcmd);
    }
    do                   //看看写进去没有,通过so管脚
    {
        temp = spi_read();
        time++;
    }                    //一直到读到的不是0xff或超时，退出去
    while(temp==0xff && time<100);
    return temp;
}

/****** 慢速发送一组SD命令 **********/
uchar write_cmd_low_speed(uchar *pcmd)
{
    uchar temp,time=0,i;
    for(i=0;i<6;i++)    //一条命令都是6个字节，形参用指针，
    {                   //指向6个字节命令，
        spi_write_low_speed(pcmd);
    }
    do                  //看看写进去没有,通过so管脚
    {
        temp = spi_read_low_speed();
        time++;
    }                   //一直到读到的不是0xff或超时，退出去
    while(temp==0xff && time<100);
    return temp;
}

/********* SD卡 激活，复位 *********/
uchar sd_reset(void)
{
    uchar time,temp,i;
    uchar pcmd[6]={0x40,0x00,0x00,0x00,0x00,0x95};
    CS = 1;
    for(i = 0; i < 0x0f; i++) //复位时，至少要72个时钟周期，
    {                         //现在是，15*8=120个clk
        spi_write_low_speed(0xff);
    }
    CS = 0;
    time=0;
    do
    {
        temp = write_cmd_low_speed(pcmd);
        time++;
        if(time > 100) return INIT_CMD0_ERROR;
    }
    while(temp != 0x01);      //校验码是0x01，表示写入成功
    CS = 1;
    spi_write_low_speed(0xff);//时序上要求补8个clk
    return 0;                 //返回0，写入成功
}

/************ SD卡初始化 ************/
uchar sd_init(void)
{
    uchar time, temp;
    uchar pcmd[6] = {0x41,0x00,0x00,0x00,0x00,0xff};
    CS = 0;
    time = 0;
    do
    {
        temp = write_cmd_low_speed(pcmd);
        time++;
        if(time > 100) return INIT_CMD1_ERROR;
    }             
    while(temp != 0x00);
    CS = 1;
    spi_write_low_speed(0xff);
    return 0;
}


/******* 读取一扇区的点阵图像 *********/
uchar sd_read_bmp(uchar data *ad)
{
    uchar temp, time, x, pcmd[6];
    uint j = 0;
    pcmd[0] = 0x51;
    pcmd[1] = *ad;
    pcmd[2] = *(++ad);
    pcmd[3] = *(++ad);
    pcmd[4] = 0;
    pcmd[5] = 0xff;

    CS = 0;
    time = 0;
    do
    {
        temp = write_cmd(pcmd);
        if(++time > 100)
        {
            CS = 1;
            return READ_BLOCK_ERROR;
        }
    }
    while(temp != 0);
                               //等待SD卡回应
    while(spi_read() != 0x7f); //0xfe,51的串口移位是LSB优先，所以结果高低位倒置
    for (j = 0; j < 504; j++)  //3310的分辨率为 84 * 48,总计用504字节
    {
        LCD3310_write_dat(spi_read());
    }
    for (x = 0; x < 10; x++) spi_read(); //略过8字节数据和2字节CRC
    spi_write(0xff);
    CS = 1;
    return 0;
}


/******* 读取一扇区的声音数据 *********/
uchar sd_read_sector(uchar data *ad)
{
    uchar temp, time, pcmd[6];
    uint j = 0;
    pcmd[0] = 0x51;
    pcmd[1] = *ad;
    pcmd[2] = *(++ad);
    pcmd[3] = *(++ad);
    pcmd[4] = 0;
    pcmd[5] = 0xff;

    CS = 0;
    time = 0;
    do
    {
        temp = write_cmd(pcmd);
        if(++time > 100)
        {
            CS = 1;
            return READ_BLOCK_ERROR;
        }
    }
    while(temp != 0);
    //等待SD回应的时间有点长，所以在这里插入显示模拟的频谱图
    temp = pbuf[16];         //随便挑一个数据显示
    LCD3310_set_XY(px,5);    //设定显示位置
    px += 6;
    if (px >= 39) px = 0;
    if (temp & 0x80) temp ^= 0x80; //求得声音振幅
    else temp = 0x80 - temp;
    temp = Level[temp>>4];         //不同幅度对应不同的谱线图案
    LCD3310_write_dat(temp);
    LCD3310_write_dat(temp);
    LCD3310_write_dat(temp);

    while(spi_read() != 0x7f);//0xfe,51的串口移位是LSB优先，所以结果高低位倒置

    while(1)     //读取512字节数据
    {
        RI = 0;_nop_(); pbuf[j++ & 63] = SBUF; //为求快速，不用函数调用
        RI = 0;_nop_(); pbuf[j++ & 63] = SBUF; //直接启动串口移入
        RI = 0;_nop_(); pbuf[j++ & 63] = SBUF; //连续读四字节
        RI = 0;_nop_(); pbuf[j++ & 63] = SBUF;
        if(j >= 512) break;
        while((((uchar)j - p) & 63) > 55);     //检测播放进度，
    }                                          //如果缓冲区接近溢出，先暂停等待
    spi_read();//略过 crc
    spi_read();//略过 crc
    spi_write(0xff);//SD 时序要求补8个脉冲
    CS = 1;
    return 0;
}


 

回复

使用道具 举报

ID:3271 发表于 2011-1-18 13:47 | 显示全部楼层
/**************************** 主程序 *******************************/
int main(void)
{
    uchar key,n,Count,Min,Sec;
    ulong addr;  // SD 的扇区地址

    P1   = 0x80; // DAC 输出中点电压
    RI   = 1;
    REN  = 1;
    TMOD = 0x02;
    TH0  = 256 - 62.5;  //定时器设定约为 32KHz，和WAV文件取样率对应
    ET0  = 1;
    EA   = 1;
    px   = 0;
    n    = 64;
    do pbuf[--n] = 0x80; while(n); //填充播放缓冲区
    delay(65535);

    LCD3310_init();
    LCD3310_set_XY(0,0);
    LCD3310_write_cmd(0x22);       //设定LCD扫描顺序
    sd_reset();
    sd_init();
    addr = 0x4f400;
    sd_read_bmp((uchar) &addr);    //显示欢迎画面
    while (D_C == 1) ;
    while (D_C == 0) ;             //等待按键
    delay(65535);
    
    //==============  main loop ==================
    while(1)  //循环播放所有曲目
    {
        TR0 = 0;
        LCD3310_write_cmd(0x22);
        LCD3310_set_XY(0,0);
        addr = 0x4f600 + ((uint)n<<9);
        sd_read_bmp((uchar) &addr); //显示歌名、歌手
        LCD3310_write_cmd(0x20);
        TR0  = 1;
        p    = 0xd0;
        Min  = 0;
        Sec  = 0;
        Count= 0;
        for (addr = Track[n]; addr < Track[n+1];)//播放第n曲
        {
            //============ 按键处理 ===============
            key = (key >> 2) | (P3 & 0x30); //仅一句的扫键函数，包括扫描和消抖
            if (key == 0x03)                //键码为03是播放/暂停键
            {
                LCD3310_set_XY(78,5);
                TCON ^= 0x10;               //TR0 取反
                if (TR0) LCD3310_print(11); //显示播放符号
                else     LCD3310_print(12); //显示暂停符号
            }       
            else if (key == 0x2b)           //键码为2b是前一曲
            {
                if ((Min || (Sec & 0xf0))) n--;//10秒后跳本曲开始
                else n -= 2;                   //10秒内跳前一曲
                break;
            }
            else if (key == 0x17)           //键码为17是后一曲
                break;

            //======== 读一扇区数据或暂停 =========
            if (TR0 == 0) {delay(2000); continue;}
            sd_read_sector((uchar) &addr);
            addr += 512;

            //=========== 播放时间计数 ============
            Count += 2;
            if (Count >= 125)
            {
                Count -= 125;
                Sec++;
                if ((Sec & 0x0f) > 9)
                {
                    Sec += 6;
                    if (Sec >= 0x60)
                    {
                        Sec = 0;
                        Min++;
                        if ((Min & 0x0f) > 9)
                        {
                            Min += 6;
                            if (Min > 0x60) Min = 0;
                        }
                    }
                 }
             }

             //======= 分时间片显示时间/标志 ========
             switch (Count & 14)
             {
                 case 2: 
                 LCD3310_set_XY(44,5);
                 LCD3310_print(Min>>4);//分钟十位
                 break;

                 case 4: 
                 LCD3310_set_XY(50,5);
                 LCD3310_print(Min&15);//分钟个位
                 break;

                 case 6: 
                 LCD3310_set_XY(56,5);
                 LCD3310_print(10);    //分隔符
                 break;

                 case 8: 
                 LCD3310_set_XY(62,5);
                 LCD3310_print(Sec>>4);//秒十位
                 break;

                 case 10: 
                 LCD3310_set_XY(68,5);
                 LCD3310_print(Sec&15);//秒个位
                 break;

                 case 12:
                 LCD3310_set_XY(78,5);
                 if (Count & 0x40) LCD3310_print(13); //闪动播放符号
                 else LCD3310_print(11); 
             }
        }
        n++;       //下一曲
        n &= 15;   //这个SD卡只有16首歌
    }//while(1);
}//main()
 
void timer0 (void) interrupt 1 using 1
{
    if (TL0 & 1) _nop_(); //消除中断响应时间不一致，造成的频率抖动
    P1  = pbuf[++p & 63]; //输出一个声音数据
}

回复

使用道具 举报

ID:3271 发表于 2011-1-18 13:47 | 显示全部楼层

//lcd.h

#include <reg52.h>
#include <INTRINS.H>

sbit SDIN = P3^2; //P3^2
sbit SCLK = P3^4;
sbit D_C  = P3^5;
sbit SCE  = P3^7;

code unsigned char Font[70] = 
{
   0x3E, 0x51, 0x49, 0x45, 0x3E ,  // 0
   0x00, 0x42, 0x7F, 0x40, 0x00 ,  // 1
   0x42, 0x61, 0x51, 0x49, 0x46 ,  // 2
   0x21, 0x41, 0x45, 0x4B, 0x31 ,  // 3
   0x18, 0x14, 0x12, 0x7F, 0x10 ,  // 4
   0x27, 0x45, 0x45, 0x45, 0x39 ,  // 5
   0x3C, 0x4A, 0x49, 0x49, 0x30 ,  // 6
   0x01, 0x71, 0x09, 0x05, 0x03 ,  // 7
   0x36, 0x49, 0x49, 0x49, 0x36 ,  // 8
   0x06, 0x49, 0x49, 0x29, 0x1E ,  // 9
   0x00, 0x00, 0x36, 0x36, 0x00 ,  // :
   0x7f, 0x3e, 0x1c, 0x08, 0x00 ,  // >
   0x3e, 0x3e, 0x00, 0x3e, 0x3e ,  // ||
   0x00, 0x00, 0x00, 0x00, 0x00 ,  //" "
};    

code unsigned char Level[8] = {0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff,};

extern void delay(unsigned int i);

void LCD3310_write_cmd(unsigned char cmd)
{
    D_C  = 0;
    SCLK = 0;
    SCE  = 0;
    delay(3);
        SDIN = cmd & 0x80;
        SCLK = 1;
        SDIN = cmd & 0x40;
        SCLK = 0;
        SCLK = 1;
        SDIN = cmd & 0x20;
        SCLK = 0;
        SCLK = 1;
        SDIN = cmd & 0x10;
        SCLK = 0;
        SCLK = 1;
        SDIN = cmd & 0x08;
        SCLK = 0;
        SCLK = 1;
        SDIN = cmd & 0x04;
        SCLK = 0;
        SCLK = 1;
        SDIN = cmd & 0x02;
        SCLK = 0;
        SCLK = 1;
        SDIN = cmd & 0x01;
        SCLK = 0;
        SCLK = 1;
    D_C  = 1;
    SDIN = 1;
    SCE  = 1;
}

void LCD3310_write_dat(unsigned char dat)
{
//    D_C  = 1;
    SCLK = 0;
    SCE  = 0;
    delay(3);
        SDIN = dat & 0x80;
        SCLK = 1;
        SDIN = dat & 0x40;
        SCLK = 0;
        SCLK = 1;
        SDIN = dat & 0x20;
        SCLK = 0;
        SCLK = 1;
        SDIN = dat & 0x10;
        SCLK = 0;
        SCLK = 1;
        SDIN = dat & 0x08;
        SCLK = 0;
        SCLK = 1;
        SDIN = dat & 0x04;
        SCLK = 0;
        SCLK = 1;
        SDIN = dat & 0x02;
        SCLK = 0;
        SCLK = 1;
        SDIN = dat & 0x01;
        SCLK = 0;
        SCLK = 1;
    D_C  = 1;
    SDIN = 1;
    SCE  = 1;
}

void LCD3310_init(void)
{
    LCD3310_write_cmd(0x21);
    LCD3310_write_cmd(0xd7);
    LCD3310_write_cmd(0x06);
    LCD3310_write_cmd(0x20);
    LCD3310_write_cmd(0x0c);
}

void LCD3310_set_XY(unsigned char x,unsigned char y)
{
    if (x >= 84) return;
    if (y >= 6)  return;
    LCD3310_write_cmd(0x80 | x);
    LCD3310_write_cmd(0x40 | y);
}

void LCD3310_print(unsigned char n)
{
    n = (n << 2) + n;
    LCD3310_write_dat(Font[n]);
    LCD3310_write_dat(Font[++n]);
    LCD3310_write_dat(Font[++n]);
    LCD3310_write_dat(Font[++n]);
    LCD3310_write_dat(Font[++n]);
}

回复

使用道具 举报

ID:2508 发表于 2011-2-25 08:18 | 显示全部楼层
cowboy？
回复

使用道具 举报

ID:70371 发表于 2014-12-12 16:10 | 显示全部楼层
要能让所有TF卡都通用就好了
回复

使用道具 举报

ID:70769 发表于 2014-12-21 04:37 | 显示全部楼层
很好，正需要
回复

使用道具 举报

ID:75720 发表于 2015-4-20 20:25 | 显示全部楼层
好东西  不错
回复

使用道具 举报

返回列表 发新帖
高级模式
B Color Image Link Quote Code Smilies
您需要登录后才可以回帖 登录 | 立即注册

本版积分规则

手机版|小黑屋|51黑电子论坛 |51黑电子论坛6群 QQ 管理员QQ:125739409;技术交流QQ群281945664

Powered by 单片机教程网

快速回复 返回顶部 返回列表