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Interface a GSM Modem and 8051 and retrieve decoded SMS

Hi everyone,

Is there any way in which I can interface a GSM modem with a 8051 and retrieve the decoded SMS. The motivation behind this is that... even if i can get the encoded SMS from the GSM modeme using AT commands, the decoding complexity is very high for a 8051. And I think the GSM module should have some kind of decoding code (using this would be benificial and reduce code complexity for 8051)

Also please let me know exactly how to interface the GSM modem to 8051. I dont want a PC interface in between.

Please help me out..

Sambit
NIT ROURKELA

Parents

0 Arthur Neagus over 18 years ago in reply to Arthur Neagus

Appology please
here is bad code

unsigned char mmc_init(void)
{
  unsigned int i;
  unsigned char response;

        MMC_CS_TRIS=0;
        MMC_VCC_KEY_TRIS=0; //out
        MMC_VCC_KEY=0; //MMC power ON
        MMC_DOUT_TRIS=1; //input

        MMC_DOUT_TRIS = 1;      // dout as input.
        MMC_CS_TRIS = 0;        // CS as output.
        MMC_CLK_TRIS = 0;       // CLK as output.
        MMC_DI_TRIS = 0;   // DI as output
        MMC_CLK = 1;

  mmc_powerup();
  mmc_unselect();

  for(i = 0; i < 10; ++i)
    mmc_read_write(0xFF);

  /* address card */
  mmc_select();

  /* reset card */
  for(i = 0; ; ++i)
  {
    response = mmc_send_command_r1(CMD_GO_IDLE_STATE, 0);
    if(response == 1)
      break;

    if(i == 0x1ff)
    {
      mmc_unselect();
      return 0;
    }
  }

  /* wait for card to get ready */
  for(i = 0; ; ++i)
  {
    response = mmc_send_command_r1(CMD_SEND_OP_COND, 0);
    if(!(response & 1))
      break;

    if(i == 0x7fff)
    {
      mmc_unselect();
      return 0;
    }
  }

  /* set block size to 512 bytes */
  if(mmc_send_command_r1(CMD_SET_BLOCKLEN, 512))
  {
    mmc_unselect();
    return 0;
  }

  /* deaddress card */
  mmc_unselect();

  raw_block_address = 0xffffffff;

  if(!mmc_read(0))
    return 0;

  return 1;
}

Reply

0 Arthur Neagus over 18 years ago in reply to Arthur Neagus

Appology please
here is bad code

unsigned char mmc_init(void)
{
  unsigned int i;
  unsigned char response;

        MMC_CS_TRIS=0;
        MMC_VCC_KEY_TRIS=0; //out
        MMC_VCC_KEY=0; //MMC power ON
        MMC_DOUT_TRIS=1; //input

        MMC_DOUT_TRIS = 1;      // dout as input.
        MMC_CS_TRIS = 0;        // CS as output.
        MMC_CLK_TRIS = 0;       // CLK as output.
        MMC_DI_TRIS = 0;   // DI as output
        MMC_CLK = 1;

  mmc_powerup();
  mmc_unselect();

  for(i = 0; i < 10; ++i)
    mmc_read_write(0xFF);

  /* address card */
  mmc_select();

  /* reset card */
  for(i = 0; ; ++i)
  {
    response = mmc_send_command_r1(CMD_GO_IDLE_STATE, 0);
    if(response == 1)
      break;

    if(i == 0x1ff)
    {
      mmc_unselect();
      return 0;
    }
  }

  /* wait for card to get ready */
  for(i = 0; ; ++i)
  {
    response = mmc_send_command_r1(CMD_SEND_OP_COND, 0);
    if(!(response & 1))
      break;

    if(i == 0x7fff)
    {
      mmc_unselect();
      return 0;
    }
  }

  /* set block size to 512 bytes */
  if(mmc_send_command_r1(CMD_SET_BLOCKLEN, 512))
  {
    mmc_unselect();
    return 0;
  }

  /* deaddress card */
  mmc_unselect();

  raw_block_address = 0xffffffff;

  if(!mmc_read(0))
    return 0;

  return 1;
}

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