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Darrel
I'm going to be moving a project from a 16F88 to an 18F1320. The reason for the move is the 18F1320 has 3 external interrupts, 2 of which I will be using. Currently I'm using instant interrupts and INT_INT on the 16F88. The question is will instant interrupts work with multiple external interrupts? I see in the datasheet that the external interrupts have numbered flags.
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See http://darreltaylor.com/DT_INTS-18/home.html. Darrel has done a good job documenting the Instant Interrupts, and it shows on the right side of the page that multiple external interrupts are implemented.Originally Posted by DynamoBen
Steve
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Thanks Steve, I forgot that he was using a separate version for the 18Fs.
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Its now 7:34 am, I just read this thread from start to finish, I would like to say it went completely over my head but some must have aimed a bit lower as I now have one hell of an headache........
I read it as I have just got a shiny new programmer and a 18f2550, I was looking for ways to port some old f88 stuff I wrote that used serial comunication, I want to it to use usb...
I found that they are some examples to make the 2550 emulate a serial port, and I may go that way, seems easier to port that way.
Then I read more and got more ambitious, and was wondering if I can port it over with the 2550 running fake serial over usb, but drop a bootloader in it before my old f88 code and use the bootloader over usb, then I wont need to use my pc serial port at all?
To summise, can I re-burn the chip via usb with a boot loader to debug my ported f88 code?
If I can, am I right in thinking all I need is to give up one i/o line to a switch to trigger the bootloader?
And like most things come in three's (especially questions), how to edit/burn to usb? with the f88 I usually create a hex file, quit basic, load the programmer software (winpic/whatever) and burn chip, remove from programmer, get a pin stuck in thumb and lose blood, stick in proto board, bend a pin etc...
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Lez, you might want to check the USB forum for that information.
Robert
My Creality Ender 3 S1 Plus is a giant paperweight that can't even be used as a boat anchor, cause I'd be fined for polluting our waterways with electronic devices.
Not as dumb as yesterday, but stupider than tomorrow!
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Either I'm really dumb today (I blame last night) or their is no usb sub forum etc on here!Lez, you might want to check the USB forum for that information.
Robert
found a few threads, gave me some stuff to read and I'm about ready to try and knock up a pcb to test the chip with, then i'll have a go with the mouse circle hid to test wiring, then throw in the serial demo and expand on that, thanks.
Last edited by Demon; - 4th October 2016 at 19:42.
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Here's the USB forum
http://www.picbasic.co.uk/forum/forumdisplay.php?f=18
Must have been a Good Night
<br>
DT
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Maybe assigning high & low priorities might help you:
http://darreltaylor.com/DT_INTS-18/LowPriority.html
One problem I am having now is that an internal interrupt (USB Service) seems to lose connection after I use an external interrupt (incoming USART data). Assigning a priority to each is just what I'm about to test and see how things go.
Robert
Last edited by Demon; - 15th August 2006 at 05:22.
My Creality Ender 3 S1 Plus is a giant paperweight that can't even be used as a boat anchor, cause I'd be fined for polluting our waterways with electronic devices.
Not as dumb as yesterday, but stupider than tomorrow!
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Sounds like a good idea.
Since an HSERIN can take up to several hundred milliseconds (depending on baud rate and data size), it's best to have HSERIN in a Low Priority handler.
And things that "must" go without fail, in the High Priorities.
DT
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Yup, that's what I was thinking, having the USB SERVICE come first, and have the USART interrupt 'whenever'.
Edit: WEEE !!!
Robert
Last edited by Demon; - 15th August 2006 at 05:22.
My Creality Ender 3 S1 Plus is a giant paperweight that can't even be used as a boat anchor, cause I'd be fined for polluting our waterways with electronic devices.
Not as dumb as yesterday, but stupider than tomorrow!
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Darrel,
How about this one? I have one interrupt to generate a USB Service, that part works fine. I'd like to add another interrupt for USB reception, is that what USB_INT is for?
Here is a snip of code:
Does that make sense? Or can I leave the USB Service interrupt enabled throughout the USB Reception interrupt?Code:;----[High Priority Interrupts]----------------------------------------------- ASM INT_LIST macro ; IntSource, Label, Type, ResetFlag? INT_Handler TMR1_INT, _ServiceUSB, PBP, yes INT_Handler USB_INT, _ReceiveUSB, PBP, yes endm INT_CREATE ; Creates the High priority interrupt processor ENDASM '---[USB - interrupt handler]------------------------------------------------ ReceiveUSB: @ INT_DISABLE TMR1_INT ; disable USB service interrupt USBBufferCount = USBBufferSizeRX DoUSBIn: USBservice ; Generate USB Service manually USBIn 1, USBBuffer, USBBufferCount, DoUSBIn varUsbIn = conByteHigh ' Set flag data has arrived @ INT_ENABLE TMR1_INT ; enable USB Service interrupts @ INT_RETURN '---[TMR1 - interrupt handler]-------------------------------------------------- ServiceUSB: USBservice @ INT_RETURN
Robert
Last edited by Darrel Taylor; - 15th August 2006 at 08:45. Reason: added [code][/code] tags
My Creality Ender 3 S1 Plus is a giant paperweight that can't even be used as a boat anchor, cause I'd be fined for polluting our waterways with electronic devices.
Not as dumb as yesterday, but stupider than tomorrow!
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almost 3 Am here.. it sounds good to me BUT i'll suggest to remove the USBSERVICE in the INT handler... m i'm sure i miss something anyway...
Last edited by mister_e; - 15th August 2006 at 09:04.
Steve
It's not a bug, it's a random feature.
There's no problem, only learning opportunities.
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See there, you're always ahead of me. Was only midnight here.
DT
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Well, I don't really know.
But, the datasheet for the 18F4550 shows 12 different interrupts from the USB module that all funnel into the single USB_INT. So I doubt it's that easy.
But if I were going to try it, I might set the ...
TRNIE: Transaction Complete Interrupt Enable bit
and see what happens.
DT
Added: and then all the others just to be sure.
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Well, I don't really know.
But, the datasheet for the 18F4550 shows 12 different interrupts from the USB module that all funnel into the single USB_INT. So I doubt it's that easy.
But if I were going to try it, I might set the ...
TRNIE: Transaction Complete Interrupt Enable bit
and see what happens.
DT
Added: and then all the others just to be sure.
WHAT DO YOU MEAN "You don't know?"
Hmmm, I would tend to believe that flag does not distinguish between upload and download transactions; I really need a PC-to-PIC complete flag.
Well, since I have an interrupt controlling user input on the PIC, I can just loop the PC-to-PIC USB routine. This will make things much easier to manage, I'm not very fond of using that all-encompassing USB_INT interrupt.
Now if I can only find out why Windows won't recognize the device, things would be peachy:
http://www.picbasic.co.uk/forum/show...8&postcount=55
Robert
My Creality Ender 3 S1 Plus is a giant paperweight that can't even be used as a boat anchor, cause I'd be fined for polluting our waterways with electronic devices.
Not as dumb as yesterday, but stupider than tomorrow!
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