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  1. #1
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    Default USB on 18F27J53. Closer but still struggling with this.

    I have an 18F27J53 with 48MHz crystal, HSPLL Div by 12 PLL. The PIC runs other functions as normal. The D+ and D- lines both have short pulses on so the hardware looks good. Tried pulling up D+ and D- (for low and high speed).

    Tried many other clock/divider combinations, this approach at least gets on the System Devices list.

    18F27J53 is not in the EasyHID Wizard, so I ran it for an 18F4550 and copied the USB line from the .BAS. None of the examples I can find use the newer J devices.

    Windows finds the client, but it doesn't like it and lists it as 'Unknown Device'.

    Any help or examples appreciated.

  2. #2
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    Default Re: USB on 18F27J53. Closer but still struggling with this.

    Give this a try, no guarantees.
    Code:
            CONFIG XINST = OFF
    	CONFIG WDTPS = 512
            CONFIG OSC = HS
    	CPUDIV = OSC1
            CONFIG ADCSEL = BIT12
    Being you are using a 48MHz crystal and USB requires 48MHz...
    CONFIG OSC = HS Will disable the PLL.
    CPUDIV = OSC1 No DIV.
    Dave
    Always wear safety glasses while programming.

  3. #3
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    Default Re: USB on 18F27J53. Closer but still struggling with this.

    Thanks for coming back.
    Tried this with same result. (Previously had HSPLL)
    Any more ideas?

    LIST
    LIST p = 18F27J53, r = dec, w = -311, f = inhx32
    INCLUDE "P18F27J53.INC" ; MPASM Header
    CONFIG XINST = OFF
    CONFIG WDTPS = 512
    CONFIG OSC = HS
    CPUDIV = OSC1
    CONFIG ADCSEL = BIT12
    NOLIST
    Last edited by kenif; - 8th August 2011 at 04:55.

  4. #4
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    Default Re: USB on 18F27J53. Closer but still struggling with this.

    Post the whole code and schematic. Maybe then...
    Dave
    Always wear safety glasses while programming.

  5. #5
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    Default Re: USB on 18F27J53. Closer but still struggling with this.

    According to table 3-5 (page 41) of the data sheet, with a 48 mhz crystal, only EC or ECPLL can be used.

  6. #6
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    Default Re: USB on 18F27J53. Closer but still struggling with this.

    I saw that, but then I looked at table 3-1 and figured HS would be the way to go...
    Maybe it will not work with a 48 MHz crystal?
    I am confused again
    Dave
    Always wear safety glasses while programming.

  7. #7
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    Default Re: USB on 18F27J53. Closer but still struggling with this.

    Microchip do not specify a range for HS clock BUT one thing i'm sure... EC/ECPLL will not work, those mode are when you're using external clock module, not crystal
    3.2.3 EXTERNAL CLOCK INPUT
    The EC and ECPLL Oscillator modes require an
    external clock source to be connected to the OSC1 pin.

    There is no oscillator start-up time required after a
    Power-on Reset (POR) or after an exit from Sleep
    mode.
    In the EC Oscillator mode, the oscillator frequency
    divided by 4, is available on the OSC2 pin. In the
    ECPLL Oscillator mode, the PLL output, divided by 4,
    is available on the OSC2 pin. This signal may be used
    for test purposes or to synchronize other logic.
    Figure 3-3 displays the pin connections for the EC
    Oscillator mode.
    HS mode, CPUDIV set to 1:1, no PLL thing...and away you go.

    If this is mounted on a solderless board... I would get rid of the ceramic capacitor around the crystal for testing purpose.

    However, there's no advantage to use a 48MHz clock.
    Last edited by mister_e; - 9th August 2011 at 09:49.
    Steve

    It's not a bug, it's a random feature.
    There's no problem, only learning opportunities.

  8. #8
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    Default Re: USB on 18F27J53. Closer but still struggling with this.

    Oops, thanks Steve and Dave.

    It looks to me that 4, 8, 12, and 16 mhz crystals can be used, but they show no examples of higher crystal operation. Unless I am wrong again, it looks to me like 16 mhz is max for this. I have a 47j53 running on a 12 mhz crystal, and I have never seen an example of them running higher than 16.

  9. #9
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    Default Re: USB on 18F27J53. Closer but still struggling with this.

    aaaaaaaaaaaaaaaaahhhhhhhhhhhhhhhhhhhhhhhhaaaaaaaaa a (refer to this video for the real voice ) seems you're right! Datasheet pdf page 535, table 31-10, parameter 1A

    So 48MHz crystal will not work. End of the story
    Steve

    It's not a bug, it's a random feature.
    There's no problem, only learning opportunities.

  10. #10
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    Default Re: USB on 18F27J53. Closer but still struggling with this.

    It currently has a 48M crystal (as HS and HSPLL) and it's working great - driving LCD.
    Tried 4M and 20M.
    Don't have 8, 12, 16 ~ time to expand my clock selection.
    Schematic and code when I get a break.

  11. #11
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    Default Re: USB on 18F27J53. Closer but still struggling with this.

    Tried 4MHz again with same results: Everything else OK but no USB.

    Schematic ~ PIC is wired: 4M on OSC; VUSB cap to gnd; USB on D+, D-; R/C on MCLR.
    Plus LCD (forget which pins) which works great.
    Oh, plus debug on pin13, works too.

    Tried with and without VB GUI running.
    Code is untouched from EasyHID Wizard (because there is sign of a helpful 'Put something here'), although I have changed OSC speed:

    ' ************************************************** **********
    ' * Auto generated EasyHID file. PBP 2.60 and above *
    ' ************************************************** **********

    ' include the HID descriptor
    include "DESCUSBProject.bas"

    DEFINE OSC 4
    DEFINE LOADER_USED 1

    USBBufferSizeMax con 8 ' maximum buffer size
    USBBufferSizeTX con 8 ' input
    USBBufferSizeRX con 8 ' output

    ' the USB buffer...
    USBBuffer Var Byte[USBBufferSizeMax]
    USBBufferCount Var Byte

    ' ************************************************** **********
    ' * main program loop - remember, you must keep the USB *
    ' * connection alive with a call to USBService every couple *
    ' * of milliseconds or so... *
    ' ************************************************** **********
    usbinit ' initialise USB...
    ProgramStart:
    gosub DoUSBIn
    gosub DoUSBOut
    goto ProgramStart

    ' ************************************************** **********
    ' * receive data from the USB bus *
    ' ************************************************** **********
    DoUSBIn:
    USBBufferCount = USBBufferSizeRX ' RX buffer size
    USBService ' keep connection alive
    USBIn 1, USBBuffer, USBBufferCount, DoUSBIn ' read data, if available
    return

    ' ************************************************** **********
    ' * wait for USB interface to attach *
    ' ************************************************** **********
    DoUSBOut:
    USBBufferCount = USBBufferSizeTX ' TX buffer size
    USBService ' keep connection alive
    USBOut 1, USBBuffer, USBBufferCount, DoUSBOut ' if bus available, transmit data
    return

    Windows responds: 'No driver files required or have been loaded for this device'
    Last edited by kenif; - 10th August 2011 at 06:51.

  12. #12
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    Default Re: USB on 18F27J53. Closer but still struggling with this.

    A couple of problems here. USB can't run at 4 mhz. You'll need the PLL to pull it up to 48 mhz. If you are, then you define your OSC as 4 mhz, well, that's a problem too.

    The HID include file was made for the 4550 and such. I suspect that it can't be used for the 47J53. Better off with dt_hid260 I think, or CDC.


    If you are using PBP 2.60, what are your configs in the .inc files?

    Also, do you have the capacitors required in page 31 of the data sheet?

  13. #13
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    Default Re: USB on 18F27J53. Closer but still struggling with this.

    Here's one that enumerates, and doesn't need a crystal. I can't get it to work with 2.60 and I don't know why. But it does work on PBP 3.0. This is for a 18F47J53, and I only quickly changed the registers to match, so it may need some work for your 27J53, but hopefully it will get you started. You will need Darrel's DT_HID260 from here: http://www.picbasic.co.uk/forum/show...0434#post80434

    And you will need DT_INTS-18.bas which you can get from here: http://darreltaylor.com/DT_INTS-18/home.html

    And you will need the executable or the Visual Basic interface: http://www.picbasic.co.uk/forum/show...0334#post30334

    Code:
    '***************************************************************************
    '*  Name    : USBdemo_DTHID.pbp                                            *
    '*  Author  : Steve Monfette/Darrel Taylor                                 *
    '*  Date    : 11/9/2009                                                    *
    '*  Version : 2.0                                                          *
    '*  Notes   : This is a re-creation of mister-e's USBdemo for DT_HID       *
    '*          : Meant to work with mister-e's GUI                            *
    '***************************************************************************
    
    ; 18F47J53, no crystal - 8 mhz internal
    #CONFIG
        config WDTEN = OFF          ;//WDT disabled (enabled by SWDTEN bit)
        CONFIG PLLDIV = 2           ;//Divide by 2 (8 MHz internal oscillator input)
        config STVREN = ON          ;  //stack overflow/underflow reset enabled
        config XINST = OFF          ;//Extended instruction set disabled
        config CPUDIV = OSC1        ;//No CPU system clock divide
        config CFGPLLEN = ON    ;        //turn on PLL config   
        config CP0 = OFF        ;    //Program memory is not code-protected
        config OSC = INTOSCPLL;HSPLL      ;    //HS oscillator, PLL enabled, HSPLL used by USB
        config FCMEN = OFF      ;    //Fail-Safe Clock Monitor disabled
        config IESO = OFF       ;    //Two-Speed Start-up disabled
        config WDTPS = 32768    ;    //1:32768
        config DSWDTOSC = INTOSCREF ;//DSWDT uses INTOSC/INTRC as clock
        config RTCOSC = T1OSCREF    ;//RTCC uses T1OSC/T1CKI as clock
        config DSBOREN = OFF        ;//Zero-Power BOR disabled in Deep Sleep
        config DSWDTEN = OFF        ;//Disabled
        config DSWDTPS = 8192       ;//1:8,192 (8.5 seconds)
        config IOL1WAY = OFF        ;//IOLOCK bit can be set and cleared
        config MSSP7B_EN = MSK7     ;//7 Bit address masking
        config WPFP = PAGE_1        ;//Write Protect Program Flash Page 0
        config WPEND = PAGE_0       ;//Start protection at page 0
        config WPCFG = OFF          ;//Write/Erase last page protect Disabled
        config WPDIS = OFF          ;//WPFP[5:0], WPEND, and WPCFG bits ignored 
    #ENDCONFIG
    
    DEFINE OSC 48
    CLEAR
    
    ;--- Setup Interrupts ------------------------------------------------------
    INCLUDE "DT_INTS-18.bas"     ; Base Interrupt System
    
    ASM
    INT_LIST  macro    ; IntSource,          Label,  Type, ResetFlag?
            INT_Handler   USB_Handler
        endm
        INT_CREATE               ; Creates the interrupt processor
    endasm
    
    ;--- Setup USB -------------------------------------------------------------
    INCLUDE "DT_HID260.pbp"
    
    DEFINE USB_VENDORID    6017
    DEFINE USB_PRODUCTID   2000
    DEFINE USB_VERSION     1
    DEFINE USB_VENDORNAME  "Mister E/DT"
    DEFINE USB_PRODUCTNAME "USBDemo"
    DEFINE USB_SERIAL      "001"
    DEFINE USB_INSIZE      8    ;  IN report is PIC to PC (8,16,32,64)
    DEFINE USB_OUTSIZE     8    ; OUT report is PC to PIC
    DEFINE USB_POLLIN      10   ; Polling times in mS, MIN=1 MAX=10
    DEFINE USB_POLLOUT     10
    
    ; --- Each USB status LED is optional, comment them if not used ------------
    ; --- They can be assigned to any pin, and no further action is required --- 
    DEFINE USB_LEDPOLARITY 1       ; LED ON State [0 or 1]  (default = 1)
    ;DEFINE USB_PLUGGEDLED  PORTB,7 ; LED indicates if USB is connected
    ;DEFINE USB_TXLED       PORTB,6 ;  "      "     data being sent to PC
    ;DEFINE USB_RXLED       PORTB,5 ;  "      "     data being received from PC
    
    
    ;--- Variables -------------------------------------------------------------
    Value0      VAR  WORD
    Value1      VAR  WORD
    X           VAR  WORD
    DUTY1       VAR  WORD
    DUTY2       VAR  WORD
    Old_PORTA   VAR  BYTE
    New_PORTA   VAR  BYTE
    
    ;--- Setup ADC -------------------------------------------------------------
    DEFINE ADC_BITS 8  ; Number of bits in ADCIN result
    
    ;--- Initialize ------------------------------------------------------------
    CCPR1L = 0
    CCPR2L = 0
    CCP1CON =   %00001100       ' CCP1, PWM mode
    CCP2CON =   %00001100       ' CCP2, PWM mode
    PR2     =   249             ' 0-1000 duty range
    T2CON   =   %00000101       ' TMR2 on, prescaler 1:4
    TRISA = %00000011
    TRISB = 0
    OUTPUT PORTC.1
    OUTPUT PORTC.2
        
    ADCON1.7 = 0       ; left justify    (Change this if ADFM in diff register)
    ADCON0 = %0001     ; AN0/AN1 Analog
    
    ;--- The Main Loop ---------------------------------------------------------
    Main:
        FOR X = 0 to 1000           ; Check for incomming USB data while waiting
    @       ON_USBRX_GOSUB  _HandleRX
            PAUSE 1
        
            New_PORTA = PORTA                ; Check PORTA pins
            IF New_PORTA != Old_PORTA THEN
                Old_PORTA = New_PORTA
                ARRAYWRITE USBTXBuffer, ["USB Demo"]
                GOSUB WaitToSend
                ARRAYWRITE USBTXBuffer, [Value0, Value1, PORTA.2, _
                                         PORTA.3, PORTA.4, PORTA.5,0,0]
                GOSUB WaitToSend
            ENDIF
        NEXT X
        
        ADCIN 0, Value0            ; Send A/D about once/sec
        ADCIN 1, Value1
        ARRAYWRITE USBTXBuffer, [Value0, Value1, PORTA.2, _
                                 PORTA.3, PORTA.4, PORTA.5,0,0]
        GOSUB SendIfReady
    GOTO Main
    
    ;--- Send Data if Plugged and ready, otherwise discard ---------------------
    SendIfReady:
        IF Plugged AND TX_READY THEN DoUSBOut
    RETURN
    
    ;--- Wait till Ready to send of until unplugged ----------------------------
    WaitToSend:
        WHILE Plugged and !TX_READY : WEND
        IF TX_READY THEN GOSUB DoUSBOut
    RETURN
    
    ;---- Receive incoming data PORTB LEDS and CCP PWM dutycycle ---------------
    HandleRX:
        ARRAYREAD  USBRXBuffer,[PORTB, DUTY1.LowByte, DUTY1.HighByte, _
                                        DUTY2.LowByte, DUTY2.HighByte]
        CCP1CON.5=DUTY1.1       ' load CCP1 duty value            
        CCP1CON.4=DUTY1.0       '      with Duty1 
        CCPR1L=DUTY1>>2         '
        
        CCP2CON.5=DUTY2.1       ' load CCP2 duty value            
        CCP2CON.4=DUTY2.0       '      with Duty2
        CCPR2L=DUTY2>>2         '
    return
    Last edited by ScaleRobotics; - 10th August 2011 at 15:29.

  14. #14
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    Default Re: USB on 18F27J53. Closer but still struggling with this.

    Magic, thank you. Upgraded to PBP3 and it all works on 18F27J53.
    CCP1/2 had to go to CCP4/5/6, and now we have three PWMs over USB (which was the object of using this device).

    As getting USB working on 18F27J53 involves collecting various files and then some tweaking I'll convert the USB demo for this PIC and put them in one place.
    (One day soon... )

    Thanks again for all your help.

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