[参考译文] TMDSCNCD28379D：通过在应用程序代码中调用 USB_Boot ()来更新闪烁 LED 应用

https://e2e.ti.com/support/microcontrollers/c2000-microcontrollers-group/c2000/f/c2000-microcontrollers-forum/1249359/tmdscncd28379d-update-blink-led-application-by-calling-usb_boot-in-application-code

您好！

在我们的应用程序中、我们大部分时间将从闪存引导。 我们希望能够定期执行固件更新。 在本例中、我们似乎会使用默认 OTP 设置从闪存引导、因为我们希望大部分时间采用这种方式引导。 我不确定是否有方法可以在闪存和 USB 之间切换引导模式？

我猜不会有。

如果正确、我唯一能想到的就是将位于以下位置的引导 ROM 代码合并 到应用程序中：C：\ti\c2000\C2000Ware_4_03_00_00\libraries\boot_rom\f2837xd\revB。 为了对此进行测试、我首先介绍了在闪存外运行的 leed_ex1_blinky 应用程序。 我会执行以下操作：

1. 将 USB 引导 ROM 代码整合到  lead_ex1_blinky 应用程序中
2. 在进入 while (1)循环之前、检查是否连接了 USB
3. 如果不是、我继续执行并开始执行  led_ex1_blinky 应用
4. 如果它是我调用 USB_Boot ()

void main(void)
{
    //
    // Initialize device clock and peripherals
    //
    Device_init();

    //
    // Initialize GPIO and configure the GPIO pin as a push-pull output
    //
    Device_initGPIO();
    GPIO_setPadConfig(DEVICE_GPIO_PIN_LED1, GPIO_PIN_TYPE_STD);
    GPIO_setDirectionMode(DEVICE_GPIO_PIN_LED1, GPIO_DIR_MODE_OUT);

    //
    // Initialize PIE and clear PIE registers. Disables CPU interrupts.
    //
    Interrupt_initModule();

    //
    // Initialize the PIE vector table with pointers to the shell Interrupt
    // Service Routines (ISR).
    //
    Interrupt_initVectorTable();

    //
    // Enable Global Interrupt (INTM) and realtime interrupt (DBGM)
    //
    EINT;
    ERTM;


    uint32_t gpio46_value = GPIO_readPin(46);
    if(gpio46_value == 1) //Checking whether USB is connected or not.
    {
        DevCfgRegs.DC12.bit.USB_A = 1;
        Uint32 EntryAddr = USB_Boot(USB_BOOT); //Calling USB_Boot function.
        return EntryAddr;
    }

    //
    // Loop Forever
    //
    for(;;)
    {
        //
        // Turn on LED
        //
        GPIO_writePin(DEVICE_GPIO_PIN_LED1, 0);

        //
        // Delay for a bit.
        //
        DEVICE_DELAY_US(500000);

        //
        // Turn off LED
        //
        GPIO_writePin(DEVICE_GPIO_PIN_LED1, 1);

        //
        // Delay for a bit.
        //
        DEVICE_DELAY_US(500000);
    }
}

在 USB_Boot ()中,它卡在 USB_Boot_Init ()中,具体来说:    while (ClkCfgRegs.SYSPLLSTS.bit.lock！= 1)｛；｝   //等待 PLL 锁定

//Initialize the USB module
void USB_Boot_Init()
{
	uint32_t EntryAddr = 0xFFFFFFFF;

	//Soprano
	//Lock the main PLL< aux PLL and enable the USB module clock
	//
	//USBCLK = 120 MHz / 2, sourced from the external oscillator for precision
	//
	//SYSCLK must be greater than USBCLK / 2, according to Design. The PLL minimum
	//Fout is 110 MHz, so let's set the multiplier to give 120 MHz and keep the
	//output divider at 1.
	EALLOW;
	ClkCfgRegs.CLKSRCCTL1.bit.OSCCLKSRCSEL = 0x0;       //Use INTOSC2 (~10 MHz) as the main PLL clock source
    ClkCfgRegs.SYSPLLMULT.all = 12;                     //Set IMULT to 12, clear FMULT
	ClkCfgRegs.SYSPLLCTL1.bit.PLLEN = 1;                //Enable the main PLL
	ClkCfgRegs.SYSCLKDIVSEL.bit.PLLSYSCLKDIV = 0;       //Set PLLSYSCLKDIV to 1
    while (ClkCfgRegs.SYSPLLSTS.bit.LOCKS != 1) {;}     //Wait for the PLL to lock
    ClkCfgRegs.SYSPLLCTL1.bit.PLLCLKEN = 1;             //Turn off the main PLL bypass

    ClkCfgRegs.CLKSRCCTL2.bit.AUXOSCCLKSRCSEL = 0x1;    //Use XTAL (20 MHz) as the aux PLL clock source
    ClkCfgRegs.AUXPLLMULT.all = 6;                      //Set IMULT to 6, clear FMULT - 120MHz
    ClkCfgRegs.AUXPLLCTL1.bit.PLLEN = 1;                //Enable the aux PLL
    ClkCfgRegs.AUXCLKDIVSEL.bit.AUXPLLDIV = 2/2;        //Set AUXPLLDIV to 2
    while (ClkCfgRegs.AUXPLLSTS.bit.LOCKS != 1) {;}     //Wait for the PLL to lock
    ClkCfgRegs.AUXPLLCTL1.bit.PLLCLKEN = 1;             //Turn off aux PLL bypass
	CpuSysRegs.PCLKCR11.bit.USB_A = 1;                  //Enable the clock to the USB module

    EntryAddr = TI_OTP_C1BROM_ESCAPE_POINT_13;
    if((EntryAddr != 0xFFFFFFFF) &&
            (EntryAddr != 0x00000000))
    {
        /*if OTP is programmed, then call OTP function*/
        ((void (*)(void))EntryAddr)();
    }


    //Connect the PHY to the GPIO pins by setting the GPBAMSEL
    //bits for GPIOs 42 and 43. VBUS and ID are now de-spec'd
    //due to the lack of a 5V fail-safe ESD structure, so
    //GPIOs 46 and 47 are not muxed out.
    GpioCtrlRegs.GPBAMSEL.bit.GPIO42 = 1;
    GpioCtrlRegs.GPBAMSEL.bit.GPIO43 = 1;
	EDIS;


	//Register the USB interrupt handler and enable CPU interrupts
	c1brom_enable_pie_in_boot(0);
	EALLOW;
	PieVectTable.USBA_INT = &UsbIntHandler;
	PieCtrlRegs.PIEIER9.bit.INTx15 = 1;
	EDIS;
	IER |= M_INT9;
	EINT;

    EntryAddr = TI_OTP_C1BROM_ESCAPE_POINT_13;
    if((EntryAddr != 0xFFFFFFFF) &&
            (EntryAddr != 0x00000000))
    {
        /*if OTP is programmed, then call OTP function*/
        ((void (*)(void))EntryAddr)();
    }

    //Reset the USB driver's global variables
    ResetUsbDriver();

    //Force USB device mode by setting DEVMODOTG and DEVMOD
	USBREG32(USB_O_GPCS) = 0x3;

	//Clear active interrupts
	USBREG16(USB_O_TXIS);
	USBREG16(USB_O_RXIS);
	USBREG8(USB_O_IS);

	//Set up endpoint 1 for bulk transfers with a 64-byte FIFO
	USBREG8(USB_O_EPIDX) = 1;
	USBREG8(USB_O_RXFIFOSZ) = 0x03;
	USBREG16(USB_O_RXFIFOADD) = 0x100;
	USBREG8(USB_O_RXCSRH1) = 0x40;

	//Enable USB interrupts for EP0 transmit/receive, EP1 receive, disconnection, and reset
	USBREG16(USB_O_TXIE) = 0x0001;
	USBREG16(USB_O_RXIE) = 0x0002;
	USBREG8(USB_O_IE) = (USB_IE_DISCON | USB_IE_RESET);

	//Attach the USB PHY to the bus
	USBREG8(USB_O_POWER) |= USB_POWER_SOFTCONN;
}

对我做错了什么有什么想法吗？

为什么它要等待 PLL 锁定？

感谢您的任何帮助！

布伦特