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PIC 18F4550 and WinXP
12-05-2013, 08:13 AM,
#1
PIC 18F4550 and WinXP
When connected to the PC there is no message stating that a new device has been recognized and requesting a driver.

Should the 20Mhz xtal be oscillating under these conditions? It is not.

This is a home built board. 5V is on the correct pins, and the USB cabling has been verified by connecting another device

I'm new to this so any suggestions would be most appreciated.

Thanks
Mercury
[/size][/font](This is my second attempt at posting this - don't know where the first one went).
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13-05-2013, 12:36 AM,
#2
RE: PIC 18F4550 and WinXP
(12-05-2013, 08:13 AM)Mercury Wrote: When connected to the PC there is no message stating that a new device has been recognized and requesting a driver.

Should the 20Mhz xtal be oscillating under these conditions? It is not.

This is a home built board. 5V is on the correct pins, and the USB cabling has been verified by connecting another device

I'm new to this so any suggestions would be most appreciated.

Thanks
Mercury
[/size][/font](This is my second attempt at posting this - don't know where the first one went).
Mercury,
i had this same problem a few years ago beating my head and think i had everything wired correctly. but i did not the biggest error i see which can be made is the wiring of the usb jack look at your pins 23 -D- & 24 - D+.


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13-05-2013, 01:39 AM,
#3
RE: PIC 18F4550 and WinXP
Many thanks for the suggestion but right now I'm trying to figure out if all is OK before I even connect the board to the pc via the usb cable. For example, with 5V supplied from a separate power supply should the 20Mhz xtal be oscillating? I have a suitable oscilloscope that I can connect to pins 13 and 14 of the pic and there is no signal. Is this normal when the board is not connected to the pc?

Mercury
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13-05-2013, 03:10 AM,
#4
RE: PIC 18F4550 and WinXP
(13-05-2013, 01:39 AM)Mercury Wrote: Many thanks for the suggestion but right now I'm trying to figure out if all is OK before I even connect the board to the pc via the usb cable. For example, with 5V supplied from a separate power supply should the 20Mhz xtal be oscillating? I have a suitable oscilloscope that I can connect to pins 13 and 14 of the pic and there is no signal. Is this normal when the board is not connected to the pc?

Mercury

i will check
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14-05-2013, 06:35 AM,
#5
RE: PIC 18F4550 and WinXP
I also posted the same question on the Microchip forum and was told that if this a new empty pic then I must install the bootloader before connecting to the pc, otherwise the pc will not communicate. If this is correct (?) then I must see about a programmer to install the bootloader hex code.

Mercury
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14-05-2013, 03:36 PM,
#6
RE: PIC 18F4550 and WinXP
(14-05-2013, 06:35 AM)Mercury Wrote: I also posted the same question on the Microchip forum and was told that if this a new empty pic then I must install the bootloader before connecting to the pc, otherwise the pc will not communicate. If this is correct (?) then I must see about a programmer to install the bootloader hex code.

Mercury

Yes this is correct I use the pickit 3 programmer very simple to upload a hex file( bootloader).
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16-05-2013, 05:51 PM,
#7
RE: PIC 18F4550 and WinXP
I put together a JDM type programmer, loaded the Pinguino bootloader hex code and now all is OK. Connecting to the pc via the USB port gives me the 'Found new hardware-Pinguino project' message followed by the Wizard.
Mercury 1
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16-05-2013, 06:41 PM,
#8
RE: PIC 18F4550 and WinXP
(16-05-2013, 05:51 PM)Mercury Wrote: I put together a JDM type programmer, loaded the Pinguino bootloader hex code and now all is OK. Connecting to the pc via the USB port gives me the 'Found new hardware-Pinguino project' message followed by the Wizard.
Mercury 1

have fun now
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