main.c

在MSP430单片机上用C操作MMC和SD卡的电路和参考代码。含PDF文档。

//*******************************************************************************
//  MSP-MMC Demo - Demo to show how to use the MMC library
//
//  Description; This example shows the correct setup and usage of the MMC
//  Library
//
//
//  S. Schauer
//  Texas Instruments, Inc
//  March 2008
//  V1.1: Updated for IAR Embedded Workbench Version: 5.10
//  V1.2: fixed fill of buffer (buffer size overrun)
//******************************************************************************

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#include <msp430x16x.h>
#include <hal_hardware_board.h>
#include <mmc.h>
#include <stdio.h>

unsigned long cardSize = 0;
unsigned char status = 1;
unsigned int timeout = 0;
int i = 0;

unsigned char buffer[512];

int main( void )
{
  WDTCTL = WDTPW + WDTHOLD;

  //Initialisation of the MMC/SD-card
  while (status != 0)                       // if return in not NULL an error did occur and the
                                            // MMC/SD-card will be initialized again 
  {
    status = mmcInit();
    timeout++;
    if (timeout == 150)                      // Try 50 times till error
    {
      //printf ("No MMC/SD-card found!! %x\n", status);
      break;
    }
  }

  while ((mmcPing() != MMC_SUCCESS));      // Wait till card is inserted

  // Read the Card Size from the CSD Register
  cardSize =  mmcReadCardSize();
    
// Clear Sectors on MMC
  for (i = 0; i < 512; i++) buffer[i] = 0;
  mmcWriteSector(0, buffer);                // write a 512 Byte big block beginning at the (aligned) adress

  for (i = 0; i < 512; i++) buffer[i] = 0;
  mmcWriteSector(1, buffer);                // write a 512 Byte big block beginning at the (aligned) adress

  mmcReadSector(0, buffer);                 // read a size Byte big block beginning at the address.
  for (i = 0; i < 512; i++) if(buffer[i] != 0) P1OUT |= 0x01;
  
  mmcReadSector(1, buffer);                 // read a size Byte big block beginning at the address.
  for (i = 0; i < 512; i++) if(buffer[i] != 0) P1OUT |= 0x02;


// Write Data to MMC  
  for (i = 0; i < 512; i++) buffer[i] = i;
  mmcWriteSector(0, buffer);                // write a 512 Byte big block beginning at the (aligned) adress

  for (i = 0; i < 512; i++) buffer[i] = i+64;
  mmcWriteSector(1, buffer);                // write a 512 Byte big block beginning at the (aligned) adress

  mmcReadSector(0, buffer);                 // read a size Byte big block beginning at the address.
  for (i = 0; i < 512; i++) if(buffer[i] != (unsigned char)i) P1OUT |= 0x04;

  mmcReadSector(1, buffer);                 // read a size Byte big block beginning at the address.
  for (i = 0; i < 512; i++) if(buffer[i] != (unsigned char)(i+64)) P1OUT |= 0x08;

  for (i = 0; i < 512; i++)
    mmcReadSector(i, buffer);               // read a size Byte big block beginning at the address.

  mmcGoIdle();                              // set MMC in Idle mode

  while (1);
}