ser_test_protocol.inl

ecos为实时嵌入式操作系统

#endif
    }

#if 0
    // FIXME: This is needed to prevent sending data at the new baud rate
    // before the host is ready.... Need to fiddle this a bit more.
    // Loop counts for ARM and PII in host side source. Replace with
    // timed loops.
    {
        int i;
        for (i = 0; i < 100000; i++);
    }
#else
    cyg_thread_delay(80);               // this requires kernel
#endif

    return res;
}


//-----------------------------------------------------------------------------
// Host sends CRC in decimal ASCII, terminated with !
int
read_host_crc(cyg_io_handle_t handle)
{
    int crc, len;
    cyg_uint8 ch;

    crc = 0;
    while (1) {
        len = 1;
        Tcyg_io_read(handle, &ch, &len);
        if ('!' == ch)
            break;

#ifdef __DEVELOPER__
        if (!((ch >= '0' && ch <= '9'))){
            diag_printf("CHAR: %02x\n", ch);
        }
#endif

        CYG_TEST_CHECK((ch >= '0' && ch <= '9'),
                       "Illegal CRC format from host");

        crc = crc*10 + (ch - '0');
    }

    return crc;
}

//---------------------------------------------------------------------------
// Test binary data transmission.
// Format out:
//  "@BINARY:<byte size>:<mode>!"
// Format in:
//  <checksum>!<#size bytes data>
// For echo modes, also:
//     Format out:
//      <#size bytes data>
//     Format in:
//      OK/ER
// Format out:
//  DONE
//
//  The last DONE allows the host to eat bytes if target is sending too many.
//
// Mode:
//   MODE_NO_ECHO:  
//       Just receive data and verify CRC.
//   MODE_EOP_ECHO:
//       Receive data, verify CRC, resend data.
//       Expect OK/ER reply from host when done.
//   MODE_DUPLEX_ECHO:
//       Receive data, echo data, verify CRC.
//       Expect OK/ER reply from host when done.
//
// Note:
//   Using diag_printf while talking with the host may cause some funky
//   errors (bytes from the host side being lost!?!?)
//
// To Do:
//   MODE_DUPLEX_ECHO:
//     The current implementation is simple and may not stress the
//     driver enough. Also, it's command packet format doesn't match
//     that of the other modes.
cyg_test_return_t
test_binary(cyg_io_handle_t handle, int size, cyg_mode_t mode)
{
    const char cmd[] = "@BINARY:";
    int msglen;
    cyg_uint32 xcrc;
    int icrc, host_crc;
    cyg_uint8 *p1;
    cyg_int8 host_status = 'O';         // host is happy by default
    int spurious = 0;

    // Verify that the test can be run with available ressources.
    if (MODE_EOP_ECHO == mode && size > IN_BUFFER_SIZE)
        return TEST_RETURN_NA;

    // Prepare and send the command.
    p1 = &cmd_buffer[0];
    p1 = strcpy(p1, &cmd[0]);
    p1 = itoa(p1, size);
    *p1++ = ':';
    p1 = itoa(p1, mode);
    *p1++ = '!';
    *p1++ = 0;

    CYG_TEST_INFO(&cmd_buffer[1]);
  
    msglen = strlen(&cmd_buffer[0]);
    Tcyg_io_write(handle, &cmd_buffer[0], &msglen);

    // Get CRC back.
    host_crc = read_host_crc(handle);

    // Depending on mode, start reading data.
    xcrc = 0;
    switch (mode) {
    case MODE_NO_ECHO:
    {
        // Break transfers into chunks no larger than the buffer size.
        int tx_len, chunk_len, i;
        while (size > 0) {
            chunk_len = min(IN_BUFFER_SIZE, size);
            tx_len = chunk_len;
            size -= chunk_len;

            Tcyg_io_read(handle, &in_buffer[0], &chunk_len);

            for (i = 0; i < tx_len; i++) {
                ADD_CRC_BYTE(xcrc, in_buffer[i]);
            }
        }

        // Reply that we have completed the test.
        {
            const char msg_done[] = "DONE";

            chunk_len = strlen(&msg_done[0]);
            Tcyg_io_write(handle, &msg_done[0], &chunk_len);
        }

    }
    break;
    case MODE_EOP_ECHO:
    {
        // We have already checked that the in buffer is large enough.
        int i, tx_len, chunk_len;
        chunk_len = tx_len = size;
        Tcyg_io_read(handle, &in_buffer[0], &chunk_len);

        for (i = 0; i < tx_len; i++) {
            ADD_CRC_BYTE(xcrc, in_buffer[i]);
        }
        
        // Echo data back.
        chunk_len = size;
        Tcyg_io_write(handle, &in_buffer[0], &chunk_len);
        
        // Now read host side's status
        chunk_len = 2;
        Tcyg_io_read(handle, &in_buffer[0], &chunk_len);
        host_status = in_buffer[0];

#if HANDLE_SPURIOUS
        // FIXME: This occassionally reads back a spurious character
        // from the transmission. It's not just noise, it's definitely
        // a byte from the previously transmitted data.
        if (in_buffer[0] != 'O' && in_buffer[1] == 'O') {
            spurious = in_buffer[0];
            chunk_len = 1;
            Tcyg_io_read(handle, &in_buffer[0], &chunk_len);
            if (in_buffer[0] == 'K') {
                host_status = 'O';
            }
        }
#endif

        // Reply that we have completed the test.
        {
            const char msg_done[] = "DONE";

            chunk_len = strlen(&msg_done[0]);
            Tcyg_io_write(handle, &msg_done[0], &chunk_len);
        }

#if HANDLE_SPURIOUS
        if (spurious) {
            diag_printf("******* Spurious byte 0x%02x *******\n", spurious);
        }
#endif

    }
    break;
    case MODE_DUPLEX_ECHO:
    {
        int chunk_len;
        int block_size = 64;

        // This is a simple implementation (maybe too simple).
        // Host sends 4 packets with the same size (64 bytes atm).
        // Target echoes in this way:
        //  packet1 -> packet1
        //  packet2 -> packet2, packet2
        //  packet3 -> packet3
        //  packet4 -> /dev/null
        //
        // The reads/writes are interleaved in a way that should ensure
        // the target out buffer to be full before the target starts to read
        // packet3. That is, the target should be both receiving (packet3)
        // and sending (packet2) at the same time.

        while (size--) {
            // block_size -> block_size
            chunk_len = block_size;
            Tcyg_io_read(handle, &in_buffer[0], &chunk_len);
            chunk_len = block_size;
            Tcyg_io_write(handle, &in_buffer[0], &chunk_len);

            // block_size -> 2 x block_size
            chunk_len = block_size;
            Tcyg_io_read(handle, &in_buffer[0], &chunk_len);
            chunk_len = block_size;
            Tcyg_io_write(handle, &in_buffer[0], &chunk_len);
            chunk_len = block_size;
            Tcyg_io_write(handle, &in_buffer[0], &chunk_len);

            // block_size -> block_size
            chunk_len = block_size;
            Tcyg_io_read(handle, &in_buffer[0], &chunk_len);
            chunk_len = block_size;
            Tcyg_io_write(handle, &in_buffer[0], &chunk_len);
        
            // block_size -> 0
            chunk_len = block_size;
            Tcyg_io_read(handle, &in_buffer[0], &chunk_len);
        }

        // Kill the CRC. Leave packet verification to the host for now.
        xcrc = host_crc = 0;

        // Now read host side's status
        chunk_len = 2;
        Tcyg_io_read(handle, &in_buffer[0], &chunk_len);
        host_status = in_buffer[0];

#if HANDLE_SPURIOUS
        // FIXME: This occassionally reads back a spurious character
        // from the transmission. It's not just noise, it's definitely
        // a byte from the previously transmitted data.
        if (in_buffer[0] != 'O' && in_buffer[1] == 'O') {
            spurious = in_buffer[0];
            chunk_len = 1;
            Tcyg_io_read(handle, &in_buffer[0], &chunk_len);
            if (in_buffer[0] == 'K') {
                host_status = 'O';
            }
        }
#endif

        // Reply that we have completed the test.
        {
            const char msg_done[] = "DONE";

            chunk_len = strlen(&msg_done[0]);
            Tcyg_io_write(handle, &msg_done[0], &chunk_len);
        }

#if HANDLE_SPURIOUS
        if (spurious) {
            diag_printf("******* Spurious byte 0x%02x *******\n", spurious);
        }
#endif
    }
    break;
    default:
        CYG_TEST_CHECK(0, "unknown mode");
    }


    // Verify that the CRC matches the one from the host.
    FIX_CRC(xcrc, icrc);
#ifdef __DEVELOPER__
    if (host_crc != icrc)
        diag_printf("%d != %d\n", icrc, host_crc);
#endif
    CYG_TEST_CHECK(host_crc == icrc, "CRC failed!");

    // Verify that the host is happy with the data we echoed.
    CYG_TEST_CHECK('O' == host_status, "Host failed checksum on echoed data");

    CYG_TEST_PASS("Binary test completed");
    return TEST_RETURN_OK;
}

//---------------------------------------------------------------------------
// Test transformations on text transmissions
// Format out:
//  "@TEXT:<mode>!<4 bytes binary checksum><C string>"
// Format in:
//  "<C string>"
//  OK/ER
//
// Mode:
//   MODE_EOP_ECHO:
//       Receive data, verify CRC, resend data.
//       Expect OK/ER reply from host when done.
//   MODE_DUPLEX_ECHO:
//       Receive data, echo data, verify CRC.
//       Expect OK/ER reply from host when done.
//
cyg_test_return_t
test_text(cyg_io_handle_t handle, cyg_mode_t mode, const char* s_base,
           const char* s_out, const char* s_in)
{
    return TEST_RETURN_NA;
}

//---------------------------------------------------------------------------
// Send PING to host, verifying the filter's presence.
// Format out:
//  "@PING!"
// Format in:
//  "OK"
// or
//  No response if directly connected to GDB.
//
// This call only returns if the ser_filter is listening. Otherwise it
// sends N/A and hangs.
void
test_ping(cyg_io_handle_t handle)
{
    char msg[] = "@PING:!";
    char msg2[] = "\n";
    int msglen = strlen(msg);
    int res;

    msglen = strlen(msg);
    Tcyg_io_write(handle, msg, &msglen);

    // Now read host side's status
    msglen = 2;
    Tcyg_io_read_timeout(handle, &in_buffer[0], &msglen, 100, &res);
    if (ENOERR == res && 'O' == in_buffer[0] && 'K' == in_buffer[1])
        return;

    msglen = strlen(msg2);
    Tcyg_io_write(handle, msg2, &msglen);

    CYG_TEST_NA("No host side testing harness detected.");
}

//---------------------------------------------------------------------------
// Some helper functions to get a test started.
void
test_open_ser( cyg_io_handle_t* handle )
{
#ifndef SER_NOP_TEST
    Cyg_ErrNo res;

    if (cyg_test_is_simulator)
        CYG_TEST_NA("Cannot run from simulator");

#if defined(HAL_VSR_SET_TO_ECOS_HANDLER)
# if defined(SER_OVERRIDE_INT_1)
    HAL_VSR_SET_TO_ECOS_HANDLER(SER_OVERRIDE_INT_1, NULL);
# endif
# if defined(SER_OVERRIDE_INT_2)
    HAL_VSR_SET_TO_ECOS_HANDLER(SER_OVERRIDE_INT_2, NULL);
# endif
#endif

    res = cyg_io_lookup(TEST_SER_DEV, handle);
    if (res != ENOERR) {
        CYG_TEST_FAIL_FINISH("Can't lookup " TEST_SER_DEV);
    }
#else
    CYG_TEST_NA("No test device specified");
#endif
}

void
test_open_tty( cyg_io_handle_t* handle )
{
#ifndef TTY_NOP_TEST
    Cyg_ErrNo res;

    if (cyg_test_is_simulator)
        CYG_TEST_NA("Cannot run from simulator");

#if defined(HAL_VSR_SET_TO_ECOS_HANDLER)
# if defined(SER_OVERRIDE_INT_1)
    HAL_VSR_SET_TO_ECOS_HANDLER(SER_OVERRIDE_INT_1, NULL);
# endif
# if defined(SER_OVERRIDE_INT_2)
    HAL_VSR_SET_TO_ECOS_HANDLER(SER_OVERRIDE_INT_2, NULL);
# endif
#endif

    res = cyg_io_lookup(TEST_TTY_DEV, handle);
    if (res != ENOERR) {
        CYG_TEST_FAIL_FINISH("Can't lookup " TEST_TTY_DEV);
    }
#else
    CYG_TEST_NA("No test device specified");
#endif
}

//---------------------------------------------------------------------------
// end of ser_test_protocol.inl