[参考译文] MSP430F5529：USBMSC 正在更新介质

您好 Jace、

我已根据程序员指南中的说明修改了程序。 不幸的是、更糟糕的是、它在第一次写入后被阻止-没有更新。 您能不能看一下相关代码、我不确定我对方向的理解是否正确。

        switch (USB_getConnectionState())
        {
            // This case is executed while your device is enumerated on the
            // USB host
            case ST_ENUM_ACTIVE:

                USBMSC_processMSCBuffer(); // Handle READ/WRITE cmds from the host

                // Every second, the Timer_A ISR sets this flag.  The
                // checking can't be done from within the timer ISR, because it
                // enables interrupts, and this is not a recommended
                // practice due to the risk of nested interrupts.
                if (bDetectCard){
                    USBMSC_checkMSCInsertionRemoval();

                    // Clear the flag, until the next timer ISR
                    bDetectCard = 0x00;
                }

                if (bCDCDataReceived_event){

                    // Clear flag early -- just in case execution breaks
                    // below because of an error
                    bCDCDataReceived_event = FALSE;

                    count = USBCDC_receiveDataInBuffer((uint8_t*)message, 32, CDC0_INTFNUM);

                    USBCDC_sendDataInBackground((uint8_t*)message, count, CDC0_INTFNUM, 1);

                    for( i = 0; i < count; i++) {
                        strcat((char *)command, (char *)&message[i]);
                        if ( message[i] == '\x0D' ) command_received = TRUE;
                        strcat((char *)command, (char *)"\x00");
                    }
                }


                if (command_received) {

                    command_received = FALSE;

                    f_mount(0, &FatFs);
                    fr = f_open( &fd, filename, FA_WRITE);
                    f_stat( filename, &fi );
                    f_lseek( &fd, fi.fsize );
                    if ( fr == FR_OK ) {
                        f_write( &fd, command, strlen((const char *)command), &nob_written );
                        f_sync( &fd );
                        fr = f_close( &fd );
                        }
                    f_mount(0, NULL);

                    *command='\x00';

                    mI.mediaPresent = USBMSC_MEDIA_PRESENT;
                    mI.mediaChanged = TRUE;
                    mI.writeProtected = 0x00;
                    disk_ioctl(0,GET_SECTOR_COUNT,&mI.lastBlockLba);
                    mI.bytesPerBlock = BYTES_PER_BLOCK;
                    USBMSC_updateMediaInformation( 0, &mI);
                }

                break;


            // These cases are executed while your device is disconnected from
            // the host (meaning, not enumerated); enumerated but suspended
            // by the host, or connected to a powered hub without a USB host
            // present.
            case ST_PHYS_DISCONNECTED:
            case ST_ENUM_SUSPENDED:
            case ST_PHYS_CONNECTED_NOENUM_SUSP:
//                __bis_SR_register(LPM3_bits + GIE);
                _NOP();
                break;

            // The default is executed for the momentary state
            // ST_ENUM_IN_PROGRESS.  Usually, this state only last a few
            // seconds.  Be sure not to enter LPM3 in this state; USB
            // communication is taking place here, and therefore the mode must
            // be LPM0 or active-CPU.
            case ST_ENUM_IN_PROGRESS:
            default:;
        }