PIC32MX270F256D USB故障，干扰Timer5中断

嘿，人们。我用的是PIC32 MX27 0F256D Rev A2，带有8MHz晶体。CPU和外围总线在40MHz。我的测试代码只包括USB设备通用HID和time5设置为溢出每1ms，并切换RA4每个溢出。PC USB和集线器不知道它是连接的。如果我在USB上评论与USB相关的3行，禁用USB，RA4引脚上观察到的波形是正确的，反相RA4电平每1ms。当使用USB时，RA4呈现一种奇怪的行为，在D+PIN从1到0的同时开始。D+PIN总是在1，短脉冲到0。图片附上。定时器4 IP＝7，IS＝3i在修订版A2（矿）有USB问题的32 MX27 0F256D的勘误表上，但目前我不知道如何根据勘误表进行必要的更改。关于USB库，它是从2010左右的一个旧版本的Microchip应用程序库中提取的。首先在MPLAB 8上开发了32 MX795F512L，后来导入了MPLAB X用于同一MCU，直到这里USB设备和USB代码工作。然后，（现在）我希望相同的代码MX27 0F256D，因为它们的USB模块是相同的，包括寄存器名和位。我只需要改变中断寄存器号以匹配32 MX70F256D、USB IPC7BITS、U1IP＝4、IPC7BITS U1IS＝0在UBJHALLIPPIC32上。HI下载了最后的Microchip库应用程序，在文件夹中没有找到32 MX。有人对此有想法吗？当做。



      以下为原文

    Hey people.
I'm using a PIC32MX270F256D rev A2 with 8MHz crystal. Cpu and peripheral bus at 40Mhz. Supplied with Pickit3.
My test code includes only USB device generic HID and Timer5 set to overflow each 1ms, and toggle RA4 each overflow. PC USB and HUB are not recognizing it as connected.

If I comment the 3 lines related to USB on main, disabling USB, the wave observed on RA4 pins is correct, inverting RA4 level each 1ms. When USB is used, RA4 presents a strange behavior that starts at the same time that D+ pin goes from 1 to 0. D+ pin is constantly in 1 with short pulses to 0. Pictures attached. Timer 4 IP = 7, IS = 3

I saw on errata of 32MX270F256D that revision A2 (mine) has USB issue, but currently I don't know how to make correctly the necessary changes according to errata.

About the USB library, it's extracted from an old version of Microchip application libraries from around 2010. It was firstly developed on MPLAB 8 for 32MX795F512L, later imported to MPLAB X for the same MCU, and until here USB device and USB code was working. Then (now) I would like the same code for MX270F256D, since their USB modules are identical, including register names and bits. I only had to change the interrupt register number to match 32MX270F256D, USB IPC7bits.U1IP = 4, IPC7bits.U1IS = 0 on u***_hal_pic32.h.

I did download of last Microchip libraries for applications and found nothing for 32MX on folders.
Someone have idea about that?
Regards.

// DEVCFG3
// USERID = No Setting
#pragma config PMDL1WAY = ON // Peripheral Module Disable Configuration (Allow only one reconfiguration)
#pragma config IOL1WAY = ON // Peripheral Pin Select Configuration (Allow only one reconfiguration)
#pragma config FUSBIDIO = OFF // USB USID Selection (Controlled by Port Function)
#pragma config FVBUSONIO = OFF // USB VBUS ON Selection (Controlled by USB Module)

// DEVCFG2
#pragma config FPLLIDIV = DIV_2 // PLL Input Divider (2x Divider)
#pragma config FPLLMUL = MUL_20 // PLL Multiplier (20x Multiplier)
#pragma config UPLLIDIV = DIV_2 // USB PLL Input Divider (2x Divider)
#pragma config UPLLEN = ON // USB PLL Enable (Enabled)
#pragma config FPLLODIV = DIV_2 // System PLL Output Clock Divider (PLL Divide by 2)

// DEVCFG1
#pragma config FNOSC = PRIPLL // Oscillator Selection Bits (Primary Osc w/PLL (XT+,HS+,EC+PLL))
#pragma config FSOSCEN = OFF // Secondary Oscillator Enable (Disabled)
#pragma config IESO = OFF // Internal/External Switch Over (Disabled)
#pragma config POSCMOD = XT // Primary Oscillator Configuration (Primary osc enabled)
#pragma config OSCIOFNC = OFF // CLKO Output Signal Active on the OSCO Pin (Disabled)
#pragma config FPBDIV = DIV_1 // Peripheral Clock Divisor (Pb_Clk is Sys_Clk/q)
#pragma config FCKSM = CSDCMD // Clock Switching and Monitor Selection (Clock Switch Disable, FSCM Disabled)
#pragma config WDTPS = PS1048576 // Watchdog Timer Postscaler (1:1048576)
#pragma config WINDIS = OFF // Watchdog Timer Window Enable (Watchdog Timer is in Non-Window Mode)
#pragma config FWDTEN = OFF // Watchdog Timer Enable (WDT Disabled (SWDTEN Bit Controls))
#pragma config FWDTWINSZ = WINSZ_25 // Watchdog Timer Window Size (Window Size is 25%)

// DEVCFG0
#pragma config JTAGEN = OFF // JTAG Enable (JTAG Disabled)
#pragma config ICESEL = ICS_PGx1 // ICE/ICD Comm Channel Select (Communicate on PGEC1/PGED1)
#pragma config PWP = OFF // Program Flash Write Protect (Disable)
#pragma config BWP = OFF // Boot Flash Write Protect bit (Protection Disabled)
#pragma config CP = OFF // Code Protect (Protection Disabled)


void main (void) {
   
    IoInit();
    MyClockInit(PB_CLOCK);
   
    //USB Init
    //OSCCONbits.UFRCEN = 0;
    //while (!OSCCONbits.ULOCK) {}
    InitializeUSBSystem();
    USBDeviceAttach();
   
    //Interrupts
    INTConfigureSystem( INT_SYSTEM_CONFIG_MULT_VECTOR );
    INTEnableInterrupts();
   
    while (TRUE) {

        ProcessUSB();
    }
}

UINT32 myClockCount = 0;

BOOL MyClockInit( UINT pbClk )
{
   
    UINT32 counts;
    UINT32 div;

    if( pbClk >= 1000 )
    {
        pbClk /= 1000;
        div = 1;

        do
        {
            counts = MY_CLOCK_PERIOD * pbClk / div;
            div <<= 1;
        }while( counts > 0xFFFF );

        div >>= 1;

        if( div == 1 ) div = 0;
        else if( div == 2 ) div = 1;
        else if( div == 4 ) div = 2;
        else if( div == 8 ) div = 3;
        else if( div == 16 ) div = 4;
        else if( div == 32 ) div = 5;
        else if( div == 64 ) div = 6;
        else if( div == 256 ) div = 7;
        else
            return FALSE;

        T5CON = 0;
        Nop();

        T5CONbits.TCKPS = div;
        TMR5 = 0;
        PR5 = counts - 1;

        IEC0bits.T5IE = 0;
        IFS0bits.T5IF = 0;
        IPC5bits.T5IP = 7;
        IPC5bits.T5IS = 3;
        IEC0bits.T5IE = 1;

        myClockCount = 0;
        T5CONbits.ON = 1;

        return TRUE;
    }

    return FALSE;
}



UINT32 MyClock(void)
{
    return myClockCount;
}


void __ISR( _TIMER_5_VECTOR, IPL7SOFT ) Timer5Handler(void)
{
    IFS0bits.T5IF = 0;
    myClockCount++;
   
    if( myClockCount == 0 )
        SoftReset();

    PIN_LED = !PIN_LED; //RA4

    return;
}
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