[参考译文] MSP430F5505：LPM3中的USB消耗太多电量

您好，Scott：

USB电源系统(3.3V LDO，1.8V LDO)和USBPLL的多个部分会影响总功耗。  USBPLL是迄今为止最大的，高达7mA。  那么您要做什么呢？  您正在尝试初始化USB，但不希望XT2运行？ 也许有关应用程序的更多详细信息可能会有所帮助。

你好，Dennis。

此应用程序适用于电池供电的BLE无线传感器，该传感器还具有USB端口，以防有人想通过USB电缆进行通信(并为电池充电)。  BLE处理器是CC2640。  MSP430 主要是USB到串行转换器，通过UART与CC2640通信。 有关  我们的无线传感器产品线，请参阅pasco.com。

我们以前使用NXP LPC11U14作为USB处理器，但由于NXP芯片短缺，我们正在使用MSP430进行重新设计。

我的USB通信正常工作，但不幸的是，闲置的USB处理器的1mA电流消耗(即没有插入USB电缆)对于我们的小电池来说有点过大。  NXP部件空闲时仅消耗数十uA。

MSP430规范规定LPM3只能绘制几个uA。  我只是想知道当USB端口断开时如何实现这一点。  您的文档说明  ，在移除VBus时调用USB_disconnect()和USB_disable()应该会在进入LPM3后将USB IP置于低功耗状态，但我看不到这一点。  我的示例代码只是复制问题的最简单的例子。

谢谢你

Scott Wild

您好，Scott：

明白了。  我以为这是一个电池供电的应用程序。

好的，请参阅SLAA457中的第16页“开始使用MSP430进行USB设计”，您将如何描述您的电源配置？

您显然是通过电池作为主要电源来工作的，所以我假设您拥有MSP430 DVCC的LDO，对吗？

仅当检测到与USB主机的连接时，才启用3.3V LDO和1.8V LDO，正确吗？

连接到主机时，您是否将电池的电源切换至MSP430 的VUSB (+3.3V)？

USB_DISABLE功能显示它确实禁用PLL。  因此，如果您调用此函数，您不会看到当前的大幅下降？

此外，请随时发布您的代码，我可以查看一下。

你好，Dennis。

您回答正确。  我有一个3.7V LiPO，驱动3.3V LDO，该LDO始终驱动AVCC/DVCC引脚。   即使我插入USB电缆(即 VBUS =+5V)--我不使用VUSB LDO输出。

在我的真实代码中，我在powerup调用usb_setup( false，true )，调用usb_init()，但不调用usb_enable()。  当我检测到VBUS时，我调用USB_enable()和USB_connect()开始通信。  当我检测到VBUS删除时，我调用USB_disconnect()和USB_disable()关闭USB核心。

插入USB电缆时，电流测量不是很有用，因为它会开始为电池充电，这会给我带来较大的负电流读数。  如果USB电缆未插入(VBUS = 0V)，则无论 是否调用了USB_disable()或USB_enable()，电流消耗都略低于1mA。

这是我的实际代码(正在进行的工作...)

#include <string.h>

#include "driverlib.h"

#include "USB_config/descriptors.h"
#include "USB_API/USB_Common/device.h"
#include "USB_API/USB_Common/usb.h"                 // USB-specific functions
#include "USB_API/USB_Common/defMSP430USB.h"
#include "PascoUSBSensor.h"
#include <msp430.h>

/*
 * NOTE: Modify hal.h to select a specific evaluation board and customize for
 * your own board.
 */
#include "hal.h"

// Global flags set by events
volatile uint8_t bCDCDataReceived_event = FALSE;  // Flag set by event handler to 
                                               // indicate data has been 
                                               // received into USB buffer

#define VERSION_MAJOR 2
#define VERSION_MINOR 0

//#define BUFFER_SIZE 256
//char dataBuffer[BUFFER_SIZE] = "";
//char nl[2] = "\n";
//uint16_t count;

#define EP0_BUF_SIZE 0x400
uint8_t usbEP0Buf[EP0_BUF_SIZE];

// Endpoint descriptors
extern __no_init tEDB __data16 tInputEndPointDescriptorBlock[];
extern __no_init tEDB __data16 tOutputEndPointDescriptorBlock[];
tEDB *ep2in = &tInputEndPointDescriptorBlock[1];
tEDB *ep3out = &tOutputEndPointDescriptorBlock[2];
uint8_t *ep2inBuf = (uint8_t *)START_OF_USB_BUFFER;
uint8_t *ep3outBuf = (uint8_t *)(START_OF_USB_BUFFER + MAX_PACKET_SIZE);

bool allowSync = false;
bool doVendorRequest = false;
int DoVendorRequest( );

#define UART_FIFO_SIZE                  0x100
#define MAX_UART_PACKET_SIZE            0x50
#define PACKET_HDR_REQUEST              0x6d
#define PACKET_HDR_ACK                  0x3e
#define PACKET_CMD_DATA                 0x01    // Send OUT packet to BLE module or recv IN data from BLE module
#define PACKET_CMD_SYNC                 0x02    // Send current USB frame to BLE module
#define PACKET_CMD_PRODUCT_ID           0x03    // Module tells us what its product ID is

unsigned char uartFifoBuf[UART_FIFO_SIZE];
unsigned char uartPacketBuf[MAX_UART_PACKET_SIZE + 10];
#define uartRecvCmd uartPacketBuf[1]
#define uartRecvSize uartPacketBuf[2]
uint8_t uartPacketCount = 0;
bool uartTxdAvailable = true;   // True if we can send a new packet to the BLE module
bool uartRxdAvailable = false;  // True if we have recvd a packet from the BLE module
uint8_t *uartFifoTail = uartFifoBuf;
uint8_t *uartFifoWrap = uartFifoBuf + UART_FIFO_SIZE;

bool doingBleBootloadRequest = false;
bool bleBootloadWaitForAck = false;
bool bleBootloadGotAck = false;
int bleBootloadResponseSize = 0;
int bleBootloadResponseSoFar = 0;
int bleBootloadChecksum = 0;
volatile uint32_t tickCountMS = 0;
uint32_t uartAckTimeout = 0;

bool isConnectedToPascoApp = false;
bool hasVBus = false;

uint8_t OnVendorOutDone(void);
void PollUsbInterrupt( );
void PollForTransfer( );
void PollForUartPackets( );
void ResetBLEModule( bool bootMode );

#define LED_PIN GPIO_PORT_P1, GPIO_PIN1
#define CONN_PIN GPIO_PORT_P6, GPIO_PIN3
#define BT_RESET_PIN GPIO_PORT_P1, GPIO_PIN7
#define FORCE_BOOT_PIN GPIO_PORT_P1, GPIO_PIN2
#define UART_TX_PIN GPIO_PORT_P4, GPIO_PIN4
#define UART_RX_PIN GPIO_PORT_P4, GPIO_PIN5
#define SetForceBootLoad( mode ) if( mode ) GPIO_setOutputHighOnPin( FORCE_BOOT_PIN ); else GPIO_setOutputLowOnPin( FORCE_BOOT_PIN )
#define DriveResetPin( drive ) if( drive ) GPIO_setAsOutputPin( BT_RESET_PIN ); else GPIO_setAsInputPinWithPullUpResistor( BT_RESET_PIN )
#define SetIsUsbConnected( connected ) if( connected ) GPIO_setOutputHighOnPin( CONN_PIN ); else GPIO_setOutputLowOnPin( CONN_PIN )
#define SetLED( on ) if( on ) GPIO_setAsOutputPin( LED_PIN ); else GPIO_setAsInputPin( LED_PIN )

#define CONN_PIN_OBSOLETE GPIO_PORT_P6, GPIO_PIN0
#define SetConnObsolete( mode ) if( mode ) GPIO_setOutputHighOnPin( CONN_PIN_OBSOLETE ); else GPIO_setOutputLowOnPin( CONN_PIN_OBSOLETE )

//**************************************************************************************
//
//**************************************************************************************
void main (void)
{
    WDT_A_hold(WDT_A_BASE); // Stop watchdog timer

    // Minimum Vcore setting required for the USB API is PMM_CORE_LEVEL_2 .
    PMM_setVCore(PMM_CORE_LEVEL_2);

    USBHAL_initPorts();           // Config GPIOS for low-power (output low)
    USBHAL_initClocks(8000000);   // Config clocks. MCLK=SMCLK=FLL=16MHz; ACLK=REFO=32kHz

    // Init USB & events, but don't connect until we detect Vbus
    USB_setup( false, true );

    // Set up UART for 8N1 500KBaud
    #define BRG_PRE 2
    #define BRG_MOD1 0
    #define BRG_MOD2 0
    USCI_A_UART_initParam params = {USCI_A_UART_CLOCKSOURCE_SMCLK, BRG_PRE, BRG_MOD1, BRG_MOD2, USCI_A_UART_NO_PARITY, USCI_A_UART_LSB_FIRST,
                                    USCI_A_UART_ONE_STOP_BIT, USCI_A_UART_MODE, USCI_A_UART_OVERSAMPLING_BAUDRATE_GENERATION};
    USCI_A_UART_init( USCI_A1_BASE, &params );
    USCI_A_UART_enableInterrupt( USCI_A1_BASE, USCI_A_UART_RECEIVE_INTERRUPT );
    USCI_A_UART_enable( USCI_A1_BASE );
    GPIO_setAsPeripheralModuleFunctionOutputPin( UART_TX_PIN );
    GPIO_setAsPeripheralModuleFunctionInputPin( UART_RX_PIN );

    // Set up initial GPIO
    GPIO_setAsOutputPin( CONN_PIN );
    GPIO_setAsOutputPin( FORCE_BOOT_PIN );
    GPIO_setDriveStrength( LED_PIN, GPIO_FULL_OUTPUT_DRIVE_STRENGTH );
    GPIO_setOutputLowOnPin( BT_RESET_PIN ); // for simulating open-drain by switching port direction.
    GPIO_setOutputLowOnPin( LED_PIN );
    SetForceBootLoad( false );
    SetLED( false );
    SetIsUsbConnected( false );
    DriveResetPin( false );

    GPIO_setAsOutputPin( CONN_PIN_OBSOLETE );
    SetConnObsolete( true );

    // Set up DMA to continuously transfer recvd data into the uart recv fifo
    DMA1SAL = (uint16_t)&UCA1RXBUF; //__data16_write_addr( (unsigned short)&DMA1SA, (unsigned long)&UCA0RXBUF );   // DMA from the UART Rx register
    DMA1DAL = (uint16_t)uartFifoBuf; // __data16_write_addr( (unsigned short)&DMA1DA, (unsigned long)uartFifoBuf );  // DMA to the UART fifo buffer
    DMA1SZ = UART_FIFO_SIZE;
    DMACTL0 |= DMA1TSEL__USCIA1RX; // DMA channel 1 triggers on UART Receive
    DMA1CTL = DMAEN | DMADT2 | DMASRCBYTE | DMADSTBYTE | DMADSTINCR_3 | DMALEVEL; // Enable byte xfers with stationary src ptr and auto-incrementing dest ptr and level triggered

    // Set up Timer A to count up every ms
    TA0CTL = TASSEL__SMCLK | MC__UP | ID__8 | TAIE; // SMCLK, Count up to CCR0, div 8 (2MHz count),
    TA0CCTL0 = CCIE; // Compare interrupt
    TA0CCR0 = 2000; // 1ms interrupt @ 2 MHz count

    // Set up USB EP2IN and ep3OUT for USB to Serial
    ep2in->bEPCNF = EPCNF_UBME; // Enable EP2 single buffer
    ep3out->bEPCNF = EPCNF_UBME; // Enable EP2 single buffer

    __enable_interrupt();  // Enable interrupts globally

    while (1)
    {
        // Check the USB state and directly main loop accordingly
        int connState = USB_getConnectionState();
        switch (connState)
        {
            // This case is executed while your device is enumerated on the USB host
            case ST_ENUM_ACTIVE:
                PollForUartPackets( );
                PollForTransfer( );

                // Handle vendor requests in main loop context
                if( doVendorRequest )
                {
                    int result = DoVendorRequest( );

                    // Errors will stall the endpoint
                    if( result == -1 )
                        usbStallEndpoint0();
                    // If returning data on an IN endpoint, do it here
                    else if( result > 0 )
                        usbSendDataPacketOnEP0( usbEP0Buf );
                    // If processing an OUT transaction, return status IN packet when done
                    else if( !(tSetupPacket.bmRequestType & USB_REQ_TYPE_INPUT) )
                        usbSendZeroLengthPacketOnIEP0( );
                    doVendorRequest = false;
                }
                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:
                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:;
        }

        // If we connected or disconnected from USB cable, let BM10 know.
        if( connState == ST_PHYS_DISCONNECTED && hasVBus )
        {
            hasVBus = false;
            SetIsUsbConnected( false );
            USB_disconnect( );
            USB_disable( );
        }
        else if( connState != ST_PHYS_DISCONNECTED && !hasVBus )
        {
            hasVBus = true;
            USB_enable( );
            USB_reset( );
            USB_connect( );
            SetIsUsbConnected( true );
        }

        // If VBus is removed, we can go to sleep
        if( !hasVBus )
        {
            __bis_SR_register(LPM3_bits + GIE);
            _NOP();
        }

    }  //while(1)
}

//**************************************************************************************
// 1ms Timer handler
//**************************************************************************************
#pragma vector=TIMER0_A0_VECTOR
__interrupt void HandleTimerAInterrupt( void )
{
    tickCountMS++;

    // Blink green LED to indicate running bootloader
//    if( (tickCountMS & 0xff) == 0 )
//        SetLED( false );
//    else if( (tickCountMS & 0xff) == 0x80 )
//        SetLED( true );

    TA0CTL &= ~TAIFG;
}

//***************************************************************************
// wait the requested number of ms
//***************************************************************************
void Delay_MS( int ms )
{
    uint32_t timeout = tickCountMS + ms;
    while( tickCountMS < timeout )
        continue;
}

//***************************************************************************
// Does a blocking write to the UART
//***************************************************************************
void UartWrite( const void *dataIn, int len )
{
    const uint8_t *data = (const uint8_t *)dataIn;
    while( len-- )
        USCI_A_UART_transmitData( USCI_A1_BASE, *data++ );
}

//***************************************************************************
// Called when EP0 OUT data transfer has completed
//***************************************************************************
uint8_t OnVendorOutDone(void)
{
    // We can now process the request since we have al of the data
    doVendorRequest = true;
    return true;
}

//***************************************************************************
// Handles the reception of a SETUP packet in interrupt context
//***************************************************************************
uint8_t HandleVendorSetupRequest( void )
{
    // If EP0 IN (read) request
    if( tSetupPacket.bmRequestType & USB_REQ_TYPE_INPUT )
    {
        // Zero-byte reads are invalid
        if( tSetupPacket.wLength == 0 )
            usbStallEndpoint0();
        else // Return the read data in the main loop context
            doVendorRequest = true;
    }
    // If zero-data EP0 OUT (write), we are ready to process it
    else if( tSetupPacket.wLength == 0 )
        doVendorRequest = true;
    // Make sure the write isn't too big
    else if( tSetupPacket.wLength > EP0_BUF_SIZE )
        usbStallEndpoint0();
    else // Fetch the data being written
        usbReceiveDataPacketOnEP0( usbEP0Buf );
    return true;
}

//**************************************************************************************
// UART packet parser
//**************************************************************************************
void PollForUartPackets( )
{
    uint8_t *uartFifoHead = (uint8_t *)DMA1DA + UART_FIFO_SIZE - DMA1SZ;
    int count = (uartFifoHead - uartFifoTail) & (UART_FIFO_SIZE - 1);

    // Safety check
    if( count > 0x100 || count < 0 )
        return;

    // If we got a recv data byte
    while( count-- )
    {
        uint8_t data = *uartFifoTail++;
        if( uartFifoTail >= uartFifoWrap )
            uartFifoTail = uartFifoBuf;

        // If we are processing CC26XX ROM bootloader responses
        if( doingBleBootloadRequest )
        {
            // If waiting for an ACK to the last packet we sent
            if( bleBootloadWaitForAck )
            {
                if( data == 0xcc || data == 0x33 )
                {
                    bleBootloadWaitForAck = false;
                    bleBootloadGotAck = (data == 0xcc);
                }
            }
            else // Looking for a response packet
            {
                // The first non-zero byte of the packet is its size
                if( bleBootloadResponseSize == 0 && data != 0 )
                    bleBootloadResponseSize = data;

                // If we are expecting more data in the packet, place it in the USB EP0 buffer
                if( bleBootloadResponseSize != 0 && bleBootloadResponseSoFar < bleBootloadResponseSize )
                {
                    if( bleBootloadResponseSoFar >= 2 )
                        bleBootloadChecksum += data;
                    usbEP0Buf[bleBootloadResponseSoFar++] = data;
                }
            }
        }
        else // This is a Pasco BLE/USB packet
        {
            // If we have not yet started a packet, look for the packet header signature byte
            if( uartPacketCount == 0 )
            {
                // If we got an ACK for the last packet we sent to the BLE module
                if( data == PACKET_HDR_ACK )
                {
                    uartTxdAvailable = true;
                    continue;
                }
                // Ignore everything until we get to the beginning of a packet
                else if( data != PACKET_HDR_REQUEST )
                    continue;
            }

            if( uartPacketCount < MAX_UART_PACKET_SIZE )
            {
                uartPacketBuf[uartPacketCount++] = data;

                // If we got a complete packet
                if( uartPacketCount >= 3 && uartPacketCount >= uartRecvSize + 3 )
                {
                    uartPacketCount = 0;
                    uartRxdAvailable = true;
                }
            }
            else // Something is wrong, look for a new packet
                uartPacketCount = 0;
        }
    }
}

//***************************************************************************
// See if any packets need to be transferred between
//***************************************************************************
void PollForTransfer( )
{
    // If we have not received an ACK within 100ms of our last packet
    // sent to the BLE module, assume there is a problem and ignore it
    if( !uartTxdAvailable && tickCountMS > uartAckTimeout )
        uartTxdAvailable = true;

    // If we are able to send a new packet to the BLE module
    if( uartTxdAvailable )
    {
        // If we have a new USB packet to send to the BLE module
        if( ep3out->bEPBCTX & EPBCNT_NAK )
        {
            // Get the received USB packet size
            uint16_t actual = ep3out->bEPBCTX & EPBCNT_BYTECNT_MASK;
            if( actual > 0 )
            {
                if( actual > MAX_UART_PACKET_SIZE - 3 )
                    actual = MAX_UART_PACKET_SIZE - 3;

                // Forward the packet to the BLE module
                uartTxdAvailable = false;
                uint8_t hdr[3] = { PACKET_HDR_REQUEST, PACKET_CMD_DATA, actual };
                UartWrite( hdr, 3 );
                UartWrite( ep3outBuf, actual );
                ep3out->bEPBCTX = 0;

                // Wait up to 100ms for ACK
                uartAckTimeout = tickCountMS + 100;
            }

            // Prepare to read another USB packet from EP3OUT
            ep3out->bEPBCTX = 0;
        }
    }

    // If we have recvd a new packet from the BLE module
    if( uartRxdAvailable )
    {
        // If the BLE module is sending us packets, it can accept periodic sync packets
        allowSync = true;

        // Indicate that we've processed the packet from the BLE module
        uartRxdAvailable = false;

        // If we recvd a BLE packet that needs to be sent to the host via USB
        if( uartRecvCmd == PACKET_CMD_DATA )
        {
            // If the USB IN endpoint can accept new data
            if( ep2in->bEPBCTX & EPBCNT_NAK )
            {
                // Give data to the USB host
                memcpy( ep2inBuf, &uartPacketBuf[3], uartRecvSize );
                ep2in->bEPBCTX = uartRecvSize;
            }
            else // Cannot send data to host, so keep trying until we can
                uartRxdAvailable = true;
        }
        // Tell the BLE module that we've processed the packet and can now accept a new one
        if( !uartRxdAvailable )
        {
            uint8_t ack = PACKET_HDR_ACK;
            UartWrite( &ack, 1 );
        }
    }
}

//***************************************************************************
//
//***************************************************************************
void ResetBLEModule( bool bootMode )
{
    // Setting these pins high will force the BM10 into its ROM bootloader so we can upgrade firmware.
    SetForceBootLoad( bootMode );

    // Toggle reset to BM10 by driving the reset pin and then tri-stating it
    DriveResetPin( true );
    Delay_MS( 10 );
    DriveResetPin( false );
    Delay_MS( 500 );

    // Clear the force-bootloader pins
    SetForceBootLoad( false );
}

//***************************************************************************
//
//***************************************************************************
static void SetUsbIsConnected( bool isConnected )
{
    // Set the signal telling the BM10 whether we are communicating via USB
    SetIsUsbConnected( isConnected );

    // Give the BM10 a little time to prepare for USB communications and send a
    // no-op over to flush out any left over UART chars.
    if( isConnected )
    {
        uint8_t zero[10];
        memset( zero, 0, sizeof( zero ) );
        Delay_MS( 10 );
        UartWrite( zero, sizeof( zero ) );
        Delay_MS( 10 );
    }
}

//**************************************************************************************
//
//**************************************************************************************
int DoVendorRequest( )
{
    // Get actual product ID
    if( tSetupPacket.bRequest == PASCO_USB_SENSOR_GET_FAUX_USB_PRODUCT_ID )
    {
        *(uint16_t *)usbEP0Buf = 1029; // *DEBUG* Wireless Smart Cart
        return 2;
    }

    // Get USB Bridge firmware version
    else if( tSetupPacket.bRequest == PASCO_USB_SENSOR_GET_FIRMWARE_VERSION )
    {
        strcpy( (char *)usbEP0Buf, "  FUsbBridge2 " __DATE__ " " __TIME__ );
        usbEP0Buf[0] = VERSION_MAJOR;
        usbEP0Buf[1] = VERSION_MINOR;
        return strlen( (const char *)&usbEP0Buf[2] ) + 2;
    }

    // Read/Write memory
    else if( tSetupPacket.bRequest == PASCO_USB_SENSOR_LOAD_FIRMWARE )
    {
        unsigned long addr = tSetupPacket.wValue | ((unsigned long)tSetupPacket.wIndex << 16);

        // If reading memory
        if( tSetupPacket.bmRequestType & USB_REQ_TYPE_INPUT )
        {
            // Prepare a packet of data to be sent to the host
            memcpy( usbEP0Buf, (const void *)addr, tSetupPacket.wLength );
            return tSetupPacket.wLength;
        }
        else // Writing memory
        {
            // Get the data that was sent by the host
            memcpy( (void *)addr, usbEP0Buf, tSetupPacket.wLength );
            return 0;
        }
    }

    // Miscellaneous requests
    else if( tSetupPacket.bRequest == PASCO_USB_SENSOR_ACCESS_HARDWARE )
    {
        int subRequest = tSetupPacket.wIndex >> 8;

        // Allow app to tell BM10 whether it wants to communicate via USB
        if( subRequest == PASPORT_HW_SET_USB_BLE_ENABLE )
        {
            SetUsbIsConnected( tSetupPacket.wValue == 0 );
            return 0;
        }

        // Complete a USB IN request to unblock any readers
        else if( subRequest == PASPORT_HW_COMPLETE_USB_IN )
        {
            ep2in->bEPBCTX = 0;
            ep2in->bEPBCTY = 0;
            return 0;
        }

        // Go into the bootloader
        else if( subRequest == PASPORT_HW_GO_BOOT_LOADER )
        {
            allowSync = false;

            // Go into our own bootloader
            if( tSetupPacket.wValue == 0 )
            {
// todo: figure this out
//                #define RAM_BASE_ADDR 0x10000000
//                *(uint32_t *)RAM_BASE_ADDR = FORCE_BOOT_SIG;
//                UsbDisconnect( );
//                NVIC_SystemReset( );
//                result = 0;
            }

            // Try forcing the BLE module into CC26xx ROM bootloader mode as force boot mode
            else if( tSetupPacket.wValue == 2 )
            {
                ResetBLEModule( true );
                return 0;
            }
        }

        // Reset the BLE module to run its main firmware
        else if( subRequest == PASPORT_HW_RESET_BOARD )
        {
            ResetBLEModule( false );
            return 0;
        }

        // Read/write the CC26XX ROM bootlader via the UART to write firmware to the CC26XX
        else if( subRequest == PASPORT_HW_RW_TI_BOOTLOADER )
        {
            allowSync = false;

            // Reading response from CC26xx ROM bootloader
            if( tSetupPacket.bmRequestType & USB_REQ_TYPE_INPUT )
            {
                if( tSetupPacket.wLength > bleBootloadResponseSize )
                    tSetupPacket.wLength = bleBootloadResponseSize;
                return tSetupPacket.wLength;
            }
            else
            {
                //todo: Need to find a way to stall the endpoint upon failure
                bool success = true;

                // Prep for request and response
                bleBootloadResponseSize = 0;
                bleBootloadResponseSoFar = 0;
                doingBleBootloadRequest = true;
                bleBootloadWaitForAck = true;
                bleBootloadGotAck = false;
                bleBootloadChecksum = 0;

                // Send the request to the CC26xx ROM bootloader
                UartWrite( usbEP0Buf, tSetupPacket.wLength );

                // Wait up to 0.5 second for an ack
                uint32_t timeout = tickCountMS + 500;
                while( tickCountMS < timeout )
                    if( !bleBootloadWaitForAck )
                        break;

                // If we didn't get an ACK, indicate an error occurred
                if( bleBootloadWaitForAck || !bleBootloadGotAck )
                    success = false;

                // If we got an ACK and we are expecting a response, wait for the response
                else if( tSetupPacket.wValue != 0 )
                {
                    // Wait up to 0.5 second for a response
                    uint32_t timeout = tickCountMS + 500;
                    while( tickCountMS < timeout )
                        if( bleBootloadResponseSize && bleBootloadResponseSoFar == bleBootloadResponseSize )
                            break;

                    bool timedOut = tickCountMS >= timeout;
                    bool checksumValid = bleBootloadResponseSize > 2 && (bleBootloadChecksum & 0xff) == usbEP0Buf[1];

                    // If we got a response, ack/nack it based on checksum validity
                    if( !timedOut )
                    {
                        unsigned char ack = checksumValid ? 0xcc : 0x33;
                        UartWrite( &ack, 1 );
                    }

                    // Indicate error if we timed out waiting for a response
                    success = (!timedOut && checksumValid);
                }
                else // No response requested, so we're good to go
                    success = true;

                doingBleBootloadRequest = false;

                return success ? 0 : -1;
            }
        }
    }

    return -1;
}

//**************************************************************************************
//
//**************************************************************************************
uint8_t HandleEP2InInterrupt( void )
{
    return FALSE;
}

//**************************************************************************************
//
//**************************************************************************************
uint8_t HandleEP3OutInterrupt( void )
{
    return FALSE;
}

//**************************************************************************************
// NMI handler
//**************************************************************************************
#if defined(__TI_COMPILER_VERSION__) || (__IAR_SYSTEMS_ICC__)
#pragma vector = UNMI_VECTOR
__interrupt void UNMI_ISR (void)
#elif defined(__GNUC__) && (__MSP430__)
void __attribute__ ((interrupt(UNMI_VECTOR))) UNMI_ISR (void)
#else
#error Compiler not found!
#endif
{
    switch (__even_in_range(SYSUNIV, SYSUNIV_BUSIFG ))
    {
        case SYSUNIV_NONE:
            __no_operation();
            break;
        case SYSUNIV_NMIIFG:
            __no_operation();
            break;
        case SYSUNIV_OFIFG:
            UCS_clearFaultFlag(UCS_XT2OFFG);
            UCS_clearFaultFlag(UCS_DCOFFG);
            SFR_clearInterrupt(SFR_OSCILLATOR_FAULT_INTERRUPT);
            break;
        case SYSUNIV_ACCVIFG:
            __no_operation();
            break;
        case SYSUNIV_BUSIFG:
            // If the CPU accesses USB memory while the USB module is
            // suspended, a "bus error" can occur.  This generates an NMI.  If
            // USB is automatically disconnecting in your software, set a
            // breakpoint here and see if execution hits it.  See the
            // Programmer's Guide for more information.
            SYSBERRIV = 0; // clear bus error flag
            USB_disable(); // Disable
    }
}

//Released_Version_5_20_06_02

谢谢你

Scott

又你好

作为一个附加数据点，当我在MSP-TS430RGC64USB评估板上执行相同的实验时，我看到了相同的东西。  当USB已初始化但未启用(USB_init()，USB_disable())时，我看到LPM3中的~700uA电流消耗。  当我不调用USB_init()时，我只在LPM3中看到170uA。

谢谢你

Scott

再次您好

另外一个数据点：

如果我在USB_init()之后尝试关闭USB LDO和XT2振荡器，电流会稍有下降(~500uA)，但当我根本不调用USB_Init()时，不会返回到我看到的~170uA。

    USB_init();                    // Init USB & events; if a host is present, connect

    // Disable USB LDOs
    USBKEYPID  = 0x9628;
    USBPWRCTL  = 0;
    USBKEYPID  = 0x9600;

    // Turn of XT2
    HWREG16(UCS_BASE + OFS_UCSCTL6) |= XT2OFF;

此外，看起来对于LPM3来说，170uA仍然相当高，因为数据表显示它应该< 10uA。  有什么想法，我可能做错了什么？

谢谢你

Scott

您好，Scott：

如果您在调试模式下运行代码，您将看到大约170-180uA贡献。 如果我不调用USB_init()直接进入LPM3，我测量5uA。  当我禁用3.3 模块(LDO_PL=OFF和LDO_PLL 1.8 = OFF)，XT2关闭和关闭时，我看到没有调试器的500uA。  我正在研究这个问题。