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Interface a GSM Modem and 8051 and retrieve decoded SMS

Sambit Das

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 in reply to sapthagiri g

    what is wrong with this code plese

    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 in reply to sapthagiri g

    what is wrong with this code plese

    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; }

Children
  • 0 in reply to Arthur Neagus

    That it is a quite long line???

    Are you _really_ sure you didn't notice this problem in the preview?

  • 0 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;
}

  • 0 in reply to Arthur Neagus

    Author: jamil rafar
    Posted: 12-Jun-2007 04:54
    "what is wrong with this code plese"

    Apart from the formatting, It appears to have nothing whatsoever with the topic of this thread!

    Please start a new thread for a new topic!