USBSERVICE + serout2 problem

[Darrel Taylor]

> May I ask what drives the USBSERVICE interrupt?
The USB module itself generates many different interrupts.

> Also I would like to use DT_INTS-18.bas in the program as well
> but I don't understand how to use the interrupt hook handler,
> and could not find any example of it.
That is not possible with USB_ASM_Service.pbp.
All interrupts used with the "Hook" can only be ASM (assembly language) type interrupts.

> Or... is there a way to turn DT_HID260 into a DT_CDC260?
No, but I could write a DT_CDC program. If I ever get my computers and internet access at home.

[aberco]

Ok, that was my understanding of the interrupt hook handler. Hmmm that will make things more difficult. A DT_CDC would be extremely helpful in my case, but that is a lot to ask...

I will think about it, currently I have two different application, both that need to use the CDC profile (HID could work, but that would make programming more difficult on the computer side... also it is nice to use a terminal to drive the device without any dedicated software).
One application needs Timer1 to do precise timing sampling, the second needs your multiple software PWM routine to drive 3 LEDs.

[Darrel Taylor]

aberco,

Here's a little ditty that should get you going with servicing CDC and DT-INTS-18.
Hope it helps.

DEFINE OSC 48

INCLUDE "cdc_desc.bas"

;--- Setup Interrupts ------------------------------------------------------
INCLUDE "DT_INTS-18.bas"     ; Base Interrupt System
INCLUDE "ReEnterPBP-18.bas"     ; Include if using PBP interrupts

ASM
INT_LIST  macro     ; IntSource,          Label,  Type, ResetFlag?
        INT_Handler     USB_INT,  _DoUSBSERVICE,   ASM,  yes
        INT_Handler     INT_INT,    _Handle_INT,   PBP,  yes
    endm
    INT_CREATE             ; Creates the Low Priority interrupt processor

    INT_ENABLE  USB_INT
    INT_ENABLE  INT_INT
ENDASM


;----[Initialise USB and Interrupts]----------------------------------------
    PAUSE 100                    ; Allow VUSB to stabilize
    USBINIT                      ; initialize the USB driver
    USBSERVICE                   ; service it once
    UIE = $7F                    ; enable USB interrupts
    UEIE = $9F                   ; enable USB Error interrupts

;----[Main program loop]----------------------------------------------------
Main:
    ; some code here
GOTO Main

;----[Interrupt handler -- Service USB]-------------------------------------
DoUSBSERVICE:
      USBSERVICE                   ; Run the SERVICE routines
@ INT_RETURN

;----[Interrupt handler -- INT]
Handle_INT:
 ; something here
@ INT_RETURN

[aberco]

Thanks Darrel, I will play with this in a couple of days, it looks like this would do the trick.

What I really like in your DT_HID260 is that all USB dependent declaration are clearly listed within the program. I feel it is better and self-contained than digging cdc_desc.bas to modify the values, but maybe it works just the same at the end. I am now planning to use a bootloader as well, so I will have to check if two independent USB setup can be used one after the other without creating conflict.

[aberco]

Well I must say that I'm still banging my head against USB CDC... I've tried this, the led does blink for 1 1/2 cycles and everything hangs and the pic does not enumerate.
Now, is it because USB is serviced before the device is attached?

I changed the interrupt from "ASM" to "PBP" (USBSERVICE is a PBP instruction).

'*******************************************************
'Config fuses for PIC18LF14K50
'*******************************************************

ASM
CONFIG CPUDIV=NOCLKDIV ; CPU runing at full speed
CONFIG USBDIV=OFF ; Low speed USB clock diviser disabled, not used here
CONFIG FOSC=HS ; Use of High Speed crystal oscillator
CONFIG PLLEN=ON ; Enable PLL multiplier, 12Mhz oscilator x 4
CONFIG PCLKEN=ON ; Primary clock source is enabled
CONFIG FCMEN=OFF ; Failsafe clock off
CONFIG IESO=OFF ; Oscillator switchover mode disabled
CONFIG WDTEN=ON ; Watchdog timer on
CONFIG WDTPS=512 ; Watchdog divider is 512
CONFIG MCLRE=OFF ; Disable MCLR pin, enable RC3
CONFIG STVREN=ON ; Stack full/underflow will cause reset
CONFIG LVP=OFF ; Low voltage programming disabled
CONFIG BBSIZ=OFF ; 512kW block boot size
CONFIG XINST=OFF ; Extended instruction mode disabled
ENDASM


DEFINE OSC 48          
DEFINE LOADER_USED 1

'*******************************************************
'Init for PIC18LF14K50
'*******************************************************

'Set ADC pins to digital operation
ADCON0 = %00000000 'turn ADC OFF
CM1CON0 = %00000000 'disabling comparator module 1
CM2CON0 = %00000000 'disabling comparator module 2

'Define pin function
TRISA = %00000000 'PortA all digital output
TRISB = %00000000 'PortB all digital output
TRISC = %00000000 'PortC all digital output

ANSEL = %00000000 'Disable analog input all pins
ANSELH = %00000000 'Disable analog input all pins

RedLED VAR PORTC.3

INCLUDE "cdc_desc.bas"

;--- Setup Interrupts ------------------------------------------------------
INCLUDE "DT_INTS-18.bas"     ; Base Interrupt System
INCLUDE "ReEnterPBP-18.bas"     ; Include if using PBP interrupts

ASM
INT_LIST  macro     ; IntSource,          Label,  Type, ResetFlag?
        INT_Handler     USB_INT,  _DoUSBSERVICE,   PBP,  yes
    endm
    INT_CREATE             ; Creates the Low Priority interrupt processor

    INT_ENABLE  USB_INT
ENDASM

;----[Initialise USB and Interrupts]----------------------------------------
    PAUSE 100                    ; Allow VUSB to stabilize
    USBINIT                      ; initialize the USB driver
    USBSERVICE                   ; service it once
    UIE = $7F                    ; enable USB interrupts
    UEIE = $9F                   ; enable USB Error interrupts

;----[Main program loop]----------------------------------------------------
Main:
HIGH RedLED
PAUSE 200
LOW REDLED
PAUSE 200
GOTO MAIN

;----[Interrupt handler -- Service USB]-------------------------------------
DoUSBSERVICE:
      USBSERVICE                   ; Run the SERVICE routines
@ INT_RETURN

END

[Darrel Taylor]

Try moving the USB enable to after the initialization.

;    INT_ENABLE  USB_INT
ENDASM

;----[Initialise USB and Interrupts]----------------------------------------
    PAUSE 100                    ; Allow VUSB to stabilize
    USBINIT                      ; initialize the USB driver
    USBSERVICE                   ; service it once
    UIE = $7F                    ; enable USB interrupts
    UEIE = $9F                   ; enable USB Error interrupts
@ INT_ENABLE  USB_INT

Enabling before USBINIT probably wasn't a good idea on my part.

And while USBSERVICE is a PBP statement, the code is all ASM and does not use any of PBP's system variables. So change it back to ASM "type".

[aberco]

Hmm that make sense... I made the changes but that doesn't work any better though.

A little troubleshooting, if I plug the USB connector halfway (just Power) the LED blink, however it stops a couple 100's ms after D+/D- get connected.