ATSHA204 加密码IC驱动程序

张衍波

ATSHA204 加密码ILz用这个芯片多久了呢
最近发现密码有时校验不过去，连续多次都不行，然后断电后再试就可以了

IIC用的模拟的，下面是测试代码，官方给的。



void evaluate_ret_code(uint8_t ret_code)
{
  if ((ret_code == SHA204_PARSE_ERROR)
        || (ret_code == SHA204_CMD_FAIL)
        || (ret_code == SHA204_RX_FAIL))
    // We got some kind of response. Return codes of
    // SHA204_PARSE_ERROR and SHA204_CMD_FAIL indicate
    // a consistent response whereas SHA204_RX_FAIL
    // just indicates that we received some bytes,
    // possibly garbled. In all these cases we put
    // the device to sleep.
    (void) sha204p_sleep();
}


/** \brief This function serves as an example for
*         the SHA204 MAC command.
*
*         In an infinite loop, it issues the same command
*         sequence using the Command Marshaling layer of
*         the SHA204 library.
* \return exit status of application
*/
int main()
{
  volatile unsigned int i;
  volatile unsigned no_exit = 1;
  unsigned int loop_counter = 0;

  // declared as "volatile" for easier debugging
  volatile uint8_t ret_code;

  // Make the command buffer the size of the MAC command.
  static uint8_t command[MAC_COUNT_LONG];

  // Make the response buffer the size of a MAC response.
  static uint8_t response[MAC_RSP_SIZE];

   // expected MAC response in mode 0
  static const uint8_t mac_mode0_response_expected[MAC_RSP_SIZE] =
  {
    MAC_RSP_SIZE,                                   // count
    0x06, 0x67, 0x00, 0x4F, 0x28, 0x4D, 0x6E, 0x98,
    0x62, 0x04, 0xF4, 0x60, 0xA3, 0xE8, 0x75, 0x8A,
    0x59, 0x85, 0xA6, 0x79, 0x96, 0xC4, 0x8A, 0x88,
    0x46, 0x43, 0x4E, 0xB3, 0xDB, 0x58, 0xA4, 0xFB,
    0xE5, 0x73                                       // CRC
  };

  // data for challenge in MAC mode 0 command
  const uint8_t challenge[MAC_CHALLENGE_SIZE] =
  {
    0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
    0x88, 0x99, 0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xFF,
    0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
    0x88, 0x99, 0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xFF
  };


  TRACE_CONFIGURE(DBGU_STANDARD, 115200, BOARD_MCK);
  printf("-- SHA204 Library Example Derived from Basic TWI EEPROM Project %s --\n\r", SOFTPACK_VERSION);
  printf("-- %s\n\r", BOARD_NAME);
  printf("-- Compiled: %s %s --\n\r", __DATE__, __TIME__);

  // Initialize the hardware interface.
  sha204p_init();

  while (no_exit)
  {
    // The following code sequence wakes up the device,
    // issues a MAC command in mode 0
    // using the Command Marshaling layer, and puts
    // the device to sleep.

    for (i = 0; i < sizeof(response); i++)
      response[i] = 0;

    // Wake up the device.
    printf("\nLoop counter: %u\nWakeup\n", loop_counter++);
    ret_code = sha204c_wakeup(&response[0]);
    if (ret_code != SHA204_SUCCESS)
    {
      fputs("No response\n", stdout);
      continue;
    }
    fputs("Response: ", stdout);
    TRACE_DumpFrame(&response[0], response[SHA204_COUNT_IDX]);

    // Mac command with mode = 0.
    ret_code = sha204m_execute(SHA204_MAC, 0, 0, MAC_CHALLENGE_SIZE, (uint8_t *) challenge,
          0, NULL, 0, NULL, sizeof(command), &command[0], sizeof(response), &response[0]);

    fputs("Command: ", stdout);
    TRACE_DumpFrame(&command[0], command[SHA204_COUNT_IDX]);
    fputs("Response ", stdout);

    if (ret_code != SHA204_SUCCESS)
    {
      fputs(" error: ", stdout);
      if (response[SHA204_COUNT_IDX] > 0)
        TRACE_DumpFrame(&response[0], response[SHA204_COUNT_IDX]);
      else
        fputs("\n", stdout);
      evaluate_ret_code(ret_code);
      continue;
    }
    fputs(": ", stdout);
    TRACE_DumpFrame(&response[0], response[SHA204_COUNT_IDX]);

    // Put device to sleep.
    ret_code = sha204p_sleep();
    fputs("Sleep\n", stdout);

    // Compare returned MAC with expected one.
    ret_code = SHA204_SUCCESS;
    for (i = 0; i < SHA204_RSP_SIZE_MAX; i++)
    {
      if (response[i] != mac_mode0_response_expected[i])
      {
        fputs("Response does not match expected response: ", stdout);
        TRACE_DumpFrame((uint8_t *) &mac_mode0_response_expected[0], mac_mode0_response_expected[SHA204_COUNT_IDX]);
        ret_code = SHA204_GEN_FAIL;
      }
    }

    // Wait for some time so trace data are not just flying by.
    for (i = 0; i < 4; i++)
      delay_ms(250);
  }
  return (int) ret_code;
}

复制代码转载C驱动程序转载