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PIC单片机 读/写 MMC/SD 卡的简单小程序

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ID:406093 发表于 2018-10-26 09:11 | 只看该作者 |只看大图 回帖奖励 |倒序浏览 |阅读模式
这里介绍一个简单的PIC单片机 读/写 MMC/SD 卡的小程序，希望大家能够喜欢。
  1. // MMC module connections
  2. sbit Mmc_Chip_Select           at LATC0_bit;  // for writing to output pin always use latch (PIC18 family)
  3. sbit Mmc_Chip_Select_Direction at TRISC0_bit;
  4. // eof MMC module connections

  6. const LINE_LEN = 43;
  7. char err_txt[20]       = "FAT16 not found";
  8. char file_contents[LINE_LEN] = "XX MMC/SD FAT16 library by Anton Rieckertn";
  9. char           filename[14] = "MIKRO00x.TXT";          // File names
  10. unsigned short loop, loop2;
  11. unsigned long  i, size;
  12. char           Buffer[512];

  14. // UART1 write text and new line (carriage return + line feed)
  15. void UART1_Write_Line(char *uart_text) {
  16.   UART1_Write_Text(uart_text);
  17.   UART1_Write(13);
  18.   UART1_Write(10);
  19. }

  21. // Creates new file and writes some data to it
  22. void M_Create_New_File() {
  23.   filename[7] = 'A';
  24.   Mmc_Fat_Set_File_Date(2010, 4, 19, 9, 0, 0); // Set file date & time info
  25.   Mmc_Fat_Assign(&filename, 0xA0);          // Find existing file or create a new one
  26.   Mmc_Fat_Rewrite();                        // To clear file and start with new data
  27.   for(loop = 1; loop <= 99; loop++) {
  28.     UART1_Write('.');
  29.     file_contents[0] = loop / 10 + 48;
  30.     file_contents[1] = loop % 10 + 48;
  31.     Mmc_Fat_Write(file_contents, LINE_LEN-1);   // write data to the assigned file
  32.   }
  33. }

  35. // Creates many new files and writes data to them
  36. void M_Create_Multiple_Files() {
  37.   for(loop2 = 'B'; loop2 <= 'Z'; loop2++) {
  38.     UART1_Write(loop2);                  // signal the progress
  39.     filename[7] = loop2;                 // set filename
  40.     Mmc_Fat_Set_File_Date(2010, 4, 19, 9, 0, 0); // Set file date & time info
  41.     Mmc_Fat_Assign(&filename, 0xA0);     // find existing file or create a new one
  42.     Mmc_Fat_Rewrite();                   // To clear file and start with new data
  43.     for(loop = 1; loop <= 44; loop++) {
  44.       file_contents[0] = loop / 10 + 48;
  45.       file_contents[1] = loop % 10 + 48;
  46.       Mmc_Fat_Write(file_contents, LINE_LEN-1);  // write data to the assigned file
  47.     }
  48.   }
  49. }

  51. // Opens an existing file and rewrites it
  52. void M_Open_File_Rewrite() {
  53.   filename[7] = 'C';
  54.   Mmc_Fat_Assign(&filename, 0);
  55.   Mmc_Fat_Rewrite();
  56.   for(loop = 1; loop <= 55; loop++) {
  57.     file_contents[0] = loop / 10 + 48;
  58.     file_contents[1] = loop % 10 + 48;
  59.     Mmc_Fat_Write(file_contents, LINE_LEN-1);    // write data to the assigned file
  60.   }
  61. }

  63. // Opens an existing file and appends data to it
  64. //               (and alters the date/time stamp)
  65. void M_Open_File_Append() {
  66.    filename[7] = 'B';
  67.    Mmc_Fat_Assign(&filename, 0);
  68.    Mmc_Fat_Set_File_Date(2010, 4, 19, 9, 20, 0);
  69.    Mmc_Fat_Append();                                    // Prepare file for append
  70.    Mmc_Fat_Write(" for mikroElektronika 2010n", 27);   // Write data to assigned file
  71. }

  73. // Opens an existing file, reads data from it and puts it to UART
  74. void M_Open_File_Read() {
  75.   char character;
  76.   
  77.   filename[7] = 'B';
  78.   Mmc_Fat_Assign(&filename, 0);
  79.   Mmc_Fat_Reset(&size);            // To read file, procedure returns size of file
  80.   for (i = 1; i <= size; i++) {
  81.     Mmc_Fat_Read(&character);
  82.     UART1_Write(character);        // Write data to UART
  83.   }
  84. }

  86. // Deletes a file. If file doesn't exist, it will first be created
  87. // and then deleted.
  88. void M_Delete_File() {
  89.   filename[7] = 'F';
  90.   Mmc_Fat_Assign(filename, 0);
  91.   Mmc_Fat_Delete();
  92. }

  94. // Tests whether file exists, and if so sends its creation date
  95. // and file size via UART
  96. void M_Test_File_Exist() {
  97.   unsigned long  fsize;
  98.   unsigned int   year;
  99.   unsigned short month, day, hour, minute;
  100.   unsigned char  outstr[12];

  102.   filename[7] = 'B';       //uncomment this line to search for file that DOES exists
  103. //  filename[7] = 'F';       //uncomment this line to search for file that DOES NOT exist
  104.   if (Mmc_Fat_Assign(filename, 0)) {
  105.     //--- file has been found - get its create date
  106.     Mmc_Fat_Get_File_Date(&year, &month, &day, &hour, &minute);
  107.     UART1_Write_Text(" created: ");
  108.     WordToStr(year, outstr);
  109.     UART1_Write_Text(outstr);
  110.     ByteToStr(month, outstr);
  111.     UART1_Write_Text(outstr);
  112.     WordToStr(day, outstr);
  113.     UART1_Write_Text(outstr);
  114.     WordToStr(hour, outstr);
  115.     UART1_Write_Text(outstr);
  116.     WordToStr(minute, outstr);
  117.     UART1_Write_Text(outstr);
  118.    
  119.     //--- file has been found - get its modified date
  120.     Mmc_Fat_Get_File_Date_Modified(&year, &month, &day, &hour, &minute);
  121.     UART1_Write_Text(" modified: ");
  122.     WordToStr(year, outstr);
  123.     UART1_Write_Text(outstr);
  124.     ByteToStr(month, outstr);
  125.     UART1_Write_Text(outstr);
  126.     WordToStr(day, outstr);
  127.     UART1_Write_Text(outstr);
  128.     WordToStr(hour, outstr);
  129.     UART1_Write_Text(outstr);
  130.     WordToStr(minute, outstr);
  131.     UART1_Write_Text(outstr);
  132.    
  133.     //--- get file size
  134.     fsize = Mmc_Fat_Get_File_Size();
  135.     LongToStr((signed long)fsize, outstr);
  136.     UART1_Write_Line(outstr);
  137.   }
  138.   else {
  139.     //--- file was not found - signal it
  140.     UART1_Write(0x55);
  141.     Delay_ms(1000);
  142.     UART1_Write(0x55);
  143.   }
  144. }


  147. // Tries to create a swap file, whose size will be at least 100
  148. // sectors (see Help for details)
  149. void M_Create_Swap_File() {
  150.   unsigned int i;

  152.   for(i=0; i<512; i++)
  153.     Buffer[i] = i;

  155.   size = Mmc_Fat_Get_Swap_File(5000, "mikroE.txt", 0x20);   // see help on this function for details

  157.   if (size) {
  158.     LongToStr((signed long)size, err_txt);
  159.     UART1_Write_Line(err_txt);

  161.     for(i=0; i<5000; i++) {
  162.       Mmc_Write_Sector(size++, Buffer);
  163.       UART1_Write('.');
  164.     }
  165.   }
  166. }

  168. // Main. Uncomment the function(s) to test the desired operation(s)
  169. void main() {
  170.   #define COMPLETE_EXAMPLE         // comment this line to make simpler/smaller example
  171.   ADCON1 |= 0x0F;                  // Configure AN pins as digital
  172.   CMCON  |= 7;                     // Turn off comparators
  173.   
  174.   // Initialize UART1 module
  175.   UART1_Init(19200);
  176.   Delay_ms(10);

  178.   UART1_Write_Line("PIC-Started"); // PIC present report

  180.   // Initialize SPI1 module
  181.   SPI1_Init_Advanced(_SPI_MASTER_OSC_DIV64, _SPI_DATA_SAMPLE_MIDDLE, _SPI_CLK_IDLE_LOW, _SPI_LOW_2_HIGH);
  182.   
  183.   // use fat16 quick format instead of init routine if a formatting is needed
  184.   if (Mmc_Fat_Init() == 0) {
  185.     // reinitialize spi at higher speed
  186.     SPI1_Init_Advanced(_SPI_MASTER_OSC_DIV4, _SPI_DATA_SAMPLE_MIDDLE, _SPI_CLK_IDLE_LOW, _SPI_LOW_2_HIGH);
  187.     //--- Test start
  188.     UART1_Write_Line("Test Start.");
  189.     //--- Test routines. Uncomment them one-by-one to test certain features
  190.     M_Create_New_File();
  191.     #ifdef COMPLETE_EXAMPLE
  192.       M_Create_Multiple_Files();
  193.       M_Open_File_Rewrite();
  194.       M_Open_File_Append();
  195.       M_Open_File_Read();
  196.       M_Delete_File();
  197.       M_Test_File_Exist();
  198.       M_Create_Swap_File();
  199.     #endif
  200.     UART1_Write_Line("Test End.");

  202.   }
  203.   else {
  204.     UART1_Write_Line(err_txt); // Note: Mmc_Fat_Init tries to initialize a card more than once.
  205.                                //       If card is not present, initialization may last longer (depending on clock speed)
  206.   }

  208. }

复制代码
详细内容，请参考：http://www.51hei.com/bbs/dpj-138111-1.html



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沙发
ID:386789 发表于 2018-10-27 11:16 | 只看该作者
这是自带库还是自己写的sd卡通信
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板凳
ID:406093 发表于 2018-10-27 21:35 | 只看该作者
这是编译软件自带库的MMC/sd 测试小程序。
详细内容，请参考：http://www.51hei.com/bbs/dpj-138111-1.html
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