[参考译文] MSP430F5527：修改 MPS430键盘项目：将消费类控制报告使用 ID 从8位改为16位

您如何将使用 ID 发送到计算机？ 您发送两个字节吗？ 计算机需要2个字节吗？

有一个2字节的输出缓冲区、第一个字节未使用、第二个字节进行"或"运算为位图。 defines 的顺序与描述符列出的顺序相同。

#define CONSREP_DATA_OFFSET     (1)

#define hidUsageVolumeUp            0x1101  //bit 0 of Consumer Control Input Report
#define hidUsageVolumeDown          0x1102  //bit 1 of Consumer Control Input Report
#define hidUsageConsumerMute        0x1104  //bit 2 of Consumer Control Input Report
#define hidUsageApp1                0x1108  //bit 3 of Consumer Control Input Report
#define hidUsageApp2                0x1110  //bit 4 of Consumer Control Input Report
#define hidUsagePlay                0x1120  //bit 5 of Consumer Control Input Report
#define hidUsageBrightnessUp        0x1140  //bit 6 of Consumer Control Input Report
#define hidUsageBrightnessDown      0x1180  //bit 7 of Consumer Control Input Report


//in KBD320_Keyboard.c
if ((keycode & 0xFF00) == CONSUMER_KEY(0))
{
    #ifdef USE_CONSUMER_REPORT
    // Add key to Consumer Report
    KBD430_ConsReport_Addkey((keycode & 0x00FF));
    #endif
}

//in KBD430_report.c
/******************************************************************************
 * @brief  Adds key to the consumer report
 *   Note that the consumer report is bit-based, so it sets/clears bits when
 *   a key is pressed
 *
 * @param key   Bits being set in the report (value will be ORed with the report)
 *
 * @return  true 
 *****************************************************************************/
#ifdef USE_CONSUMER_REPORT
bool KBD430_ConsReport_Addkey( uint8_t key )
{
    ConsReport_buff.Buff[CONSREP_DATA_OFFSET] |= key;
    ConsReport_buff.Update = true;
    return true;
}
#endif

然后将该缓冲器传递给发送 该缓冲器的函数

#ifdef USE_CONSUMER_REPORT    
    if (ConsReport_buff.Update == true)
    {
        if (KBD430_ReportSend((uint8_t *)&ConsReport_buff.Buff[0], HID_Consumer) == true)
        {
            // Clear flag if the report was sent correctly
            ConsReport_buff.Update = false;
        }
    }
#endif

bool KBD430_ReportSend(uint8_t * reportData, uint8_t intfNum)
{
    if (USBHID_sendReport(reportData, intfNum) == kUSBHID_sendComplete)
    {
        return true;
    }
    else
    {
        return false;
    }
}

uint8_t USBHID_sendReport (const uint8_t * reportData, uint8_t intfNum)
{
    uint8_t byte_count;
    uint8_t * pEP1;
    uint8_t * pCT1;

    uint8_t edbIndex;

    edbIndex = stUsbHandle[intfNum].edb_Index;

    //do not access USB memory if suspended (PLL off). It may produce BUS_ERROR
    if ((bFunctionSuspended) ||
        (bEnumerationStatus != ENUMERATION_COMPLETE)){
        return (kUSBHID_busNotAvailable);
    }

    if (HidWriteCtrl[INTFNUM_OFFSET(intfNum)].bCurrentBufferXY == X_BUFFER){
        //this is the active EP buffer
        pEP1 = (uint8_t*)stUsbHandle[intfNum].iep_X_Buffer;
        pCT1 = &tInputEndPointDescriptorBlock[edbIndex].bEPBCTX;
    } else {
        //this is the active EP buffer
        pEP1 = (uint8_t*)stUsbHandle[intfNum].iep_Y_Buffer;
        pCT1 = &tInputEndPointDescriptorBlock[edbIndex].bEPBCTY;
    }

    byte_count = report_len_input[INTFNUM_OFFSET(intfNum)];

    if (*pCT1 & EPBCNT_NAK){                                                        //if this EP is empty
        USB_TX_memcpy(pEP1, reportData, byte_count);                                //copy data into IEP X or Y buffer
        uint8_t au8HIDReportDebug[10] = {0};
        memcpy(au8HIDReportDebug, reportData, byte_count);                                //copy data into IEP X or Y buffer
        *pCT1 = byte_count;                                                         //Set counter for usb In-Transaction
        HidWriteCtrl[INTFNUM_OFFSET(intfNum)].bCurrentBufferXY =
            (HidWriteCtrl[INTFNUM_OFFSET(intfNum)].bCurrentBufferXY + 1) & 0x01;    //switch buffer
        return (kUSBHID_sendComplete);
    }
    return (kUSBHID_intfBusyError);
}

我想它一直在发送一个8位位位图、在创建描述符期间定义了这些用途。 此用法的大小不应影响代码。