Originally Posted by
Darrel Taylor
To: Demon and mister_e,
Hey, did you guys ever figure out the USB with DT_INTs approach.
I was thinking about trying a USB project, and wondered if you 2 ever got it working?
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Well, i hate to say that Darrel but something goes bad when using instant interrupt and USB. Maybe some PBP variable need to be saved or something like that.
Bellow is a short and sweet working example using ON INTERRUPT to do the USBSERVICE each 100uSec.
OK it doesn't do anything else than sitting there and spin but, it keeps the connection alive without any Windows Warning. Once this solve, it should fix USBOUT and USBIN... or help to 
It use a PIC18F4550 and a 4MHZ crystal OSC.
Code:
asm
__CONFIG _CONFIG1L, _PLLDIV_1_1L & _CPUDIV_OSC1_PLL2_1L & _USBDIV_2_1L
; ; ; USB clock source comes from the 96 MHz PLL divided by 2
; ; [OSC1/OSC2 Src: /1][96 MHz PLL Src: /2]
; No prescale (4 MHz oscillator input drives PLL directly)
__CONFIG _CONFIG1H, _FOSC_XTPLL_XT_1H & _FCMEN_OFF_1H & _IESO_OFF_1H
; ; ; Oscillator Switchover mode disabled
; ; Fail-Safe Clock Monitor disabled
; XT oscillator, PLL enabled, XT used by USB
__CONFIG _CONFIG2L, _PWRT_ON_2L & _BOR_ON_2L & _BORV_2_2L & _VREGEN_ON_2L
__CONFIG _CONFIG2H, _WDT_OFF_2H
__CONFIG _CONFIG3H, _MCLRE_ON_3H & _LPT1OSC_OFF_3H & _PBADEN_OFF_3H & _CCP2MX_ON_3H
__CONFIG _CONFIG4L, _STVREN_ON_4L & _LVP_OFF_4L & _ICPRT_OFF_4L & _XINST_OFF_4L & _DEBUG_OFF_4L
endasm
DEFINE OSC 48
PORTB = 0
TRISB.0 = 0
LED0 VAR PORTB.0
TMR0IF VAR INTCON.2
TMR0ON VAR T0CON.7
INTCON = %10100000 ' Enable global and TMR0 interrupts
T0CON = %10000000 ' TMR0, CLK internal, prescaler 1:2, T0ON
UCFG var byte EXT ' include UCFG register... Yeah Melabs didn't :o(
Reload con 65000 ' ~100 uSec
ucfg = %00010100 ' enable internal USB pull-up, Full speed USB
goto SkipMacro
asm
Reload_TMR0 macro
BCF _TMR0ON ; stop timer
MOVE?CW _Reload,TMR0L ; reload
BCF _TMR0IF ; clear overflow flag
BSF _TMR0ON ; start timer
ENDM
endasm
SkipMacro:
pause 500 ' Settle delay
usbinit ' initialise USB...
@ Reload_TMR0 ; Reload timer0
ON INTERRUPT GOTO DoUSBService
Start:
goto start ' Spin 'till you die!
DISABLE
DoUSBService:
toggle LED0 ' toggle LED each time
usbservice ' keep connection alive
@ Reload_TMR0 ; reload timer
RESUME ' getout of here
ENABLE
So nothing complicated... just spinning and keep USB connection alive.
NOW, if i use the DT interrupt, IT SHOULD looks like this
Code:
asm
__CONFIG _CONFIG1L, _PLLDIV_1_1L & _CPUDIV_OSC1_PLL2_1L & _USBDIV_2_1L
; ; ; USB clock source comes from the 96 MHz PLL divided by 2
; ; [OSC1/OSC2 Src: /1][96 MHz PLL Src: /2]
; No prescale (4 MHz oscillator input drives PLL directly)
__CONFIG _CONFIG1H, _FOSC_XTPLL_XT_1H & _FCMEN_OFF_1H & _IESO_OFF_1H
; ; ; Oscillator Switchover mode disabled
; ; Fail-Safe Clock Monitor disabled
; XT oscillator, PLL enabled, XT used by USB
__CONFIG _CONFIG2L, _PWRT_ON_2L & _BOR_ON_2L & _BORV_2_2L & _VREGEN_ON_2L
__CONFIG _CONFIG2H, _WDT_OFF_2H
__CONFIG _CONFIG3H, _MCLRE_ON_3H & _LPT1OSC_OFF_3H & _PBADEN_OFF_3H & _CCP2MX_ON_3H
__CONFIG _CONFIG4L, _STVREN_ON_4L & _LVP_OFF_4L & _ICPRT_OFF_4L & _XINST_OFF_4L & _DEBUG_OFF_4L
endasm
DEFINE OSC 48
PORTB = 0
TRISB.0 = 0
LED0 VAR PORTB.0
TMR0IF VAR INTCON.2
TMR0ON VAR T0CON.7
INTCON = %10100000 ' Enable global and TMR0 interrupts
T0CON = %10000000 ' TMR0, CLK internal, prescaler 1:2, T0ON
UCFG var byte EXT ' include UCFG register... Yeah Melabs didn't :o(
Reload con 65000 ' ~100 uSec
ucfg = %00010100 ' enable internal USB pull-up, Full speed USB
INCLUDE "DT_INTS-18.bas" ' Base Interrupt System
INCLUDE "ReEnterPBP-18.bas" ' Include if using PBP interrupts
goto skipmacro
ASM
INT_LIST macro ; IntSource, Label, Type, ResetFlag?
INT_Handler TMR0_INT, _DoUSBService, PBP, no
endm
INT_CREATE ; Creates the interrupt processor
Reload_TMR0 macro
BCF _TMR0ON ; stop timer
MOVE?CW _Reload,TMR0L ; reload
BCF _TMR0IF ; clear overflow flag
BSF _TMR0ON ; start timer
ENDM
endasm
SkipMacro:
pause 500
usbinit ' initialise USB...
@ Reload_TMR0
@ INT_ENABLE TMR0_INT
Start:
goto start
DoUSBService:
toggle led0
usbservice
@ Reload_TMR0
@ INT_RETURN
Right or i screw something? Anyways ON both, the LED work as expected (so i shouldn't be too wrong) but, the second lost the USB connection really soon... and yeah you have to reboot or it will reboot for you if you disconnect
the USB plug. It's getting boring 
i attach everything i have in my C:\PBP_PROG\USBDemo folder, including a compiled VB utility to monitor if the device is Connected or Not when using EasyHID default VendorID and ProductID
<img SRC="http://www.picbasic.co.uk/forum/attachment.php?attachmentid=1300&stc=1&d=116748409 1">
So for now, i still use the On Interrupt... Before i read and understand the whole Jan Axelson book, and build my own USB macros, i may need much spare time... oh yeah it's more than a RS-232 and there's a lot of improvements and adds to do with PBP.
Now the weird stuff... Melabs didn't include the 'interesting' registers like UCFG, UIR,UIE,UEIR,UEIE and probably others... bah xxx VAR BYTE EXT fix it for now and if needed.
To be honest, i didn't search really hard to find the problem source... getting lazy i guess :-)
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