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MiniMe
Joined: 17 Nov 2009
Posts: 50
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 Posted: Fri Jan 07, 2011 8:30 am |
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matheuslps, Thank You !
You reply helped me much, now I've got virtual PC running on my main Win7 laptop and I managed to fix some issues with Proteus (you might want to re-install Proteus USB driver every time you start the program).
Also thank you for this minimized examples for 18F4550 USB.
Later I will build PCB and will do a reply on my progress. |
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gmua
Joined: 07 Feb 2011
Posts: 11
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| Posted: Mon Feb 07, 2011 11:28 am |
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| matheuslps wrote: | A small program to test the hardware:
| Code: | #include <18F4550.h>
#fuses HSPLL,NOWDT,NOPROTECT,NOLVP,NODEBUG,USBDIV,PLL1,CPUDIV1,VREGEN //For 4Mhz cristal
#use delay(clock=48000000)
#include <usb_cdc.h>
void main()
{
usb_cdc_init(); // Start cdc
usb_init(); // Start USB
for(;;) //Forever
{
usb_task(); // Test usb
if (usb_enumerated())
{
printf(usb_cdc_putc,"Testando Conexao USB->Serial!\n\r");
delay_ms (100);
}
}
} |
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Greetings matheuslps, what version of CCS are you using to compile the code?
I am getting the following warnings when I compile it, and when I try to simulate it in Proteus, it doesn't work (the USB analizer shows nothing).
| Quote: | >>> Warning 203 "C:\Archivos de programa\PICC\drivers\pic18_usb.c" Line 531(1,1): Condition always TRUE
>>> Warning 216 "USBPROJ.c" Line 24(0,1): Interrupts disabled during call to prevent re-entrancy: (usb_token_reset)
>>> Warning 216 "USBPROJ.c" Line 24(0,1): Interrupts disabled during call to prevent re-entrancy: (usb_tbe)
>>> Warning 216 "USBPROJ.c" Line 24(0,1): Interrupts disabled during call to prevent re-entrancy: (usb_cdc_flush_out_buffer)
Memory usage: ROM=14% RAM=20% - 23%
0 Errors, 4 Warnings. |
I have some sample HEX files from other sites that do work, so I'm guessing the problem is with my version of the compiler (I'm using v4.106).
Thanks in advance. |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19328
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| Posted: Mon Feb 07, 2011 3:37 pm |
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No.
These are _warnings_ only.
They are just pointing out some things that _might_ be potential problems. They are not.
The 'condition always TRUE', comes from the infinite loop to keep the code from dropping off the end. Normal.
The warnings about interrupts being disabled, are because a couple of things in the library call code inside and outside interrupts. Perfectly OK, since the routines involved are short.
Best Wishes |
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gmua
Joined: 07 Feb 2011
Posts: 11
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| Posted: Mon Feb 07, 2011 7:16 pm |
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| Ttelmah wrote: | No.
These are _warnings_ only.
They are just pointing out some things that _might_ be potential problems. They are not.
The 'condition always TRUE', comes from the infinite loop to keep the code from dropping off the end. Normal.
The warnings about interrupts being disabled, are because a couple of things in the library call code inside and outside interrupts. Perfectly OK, since the routines involved are short.
Best Wishes |
Thanks for the reply Ttelmah, I compiled the program using version 3.249 and it didn't show any of the warnings, but still doesn't work with Proteus.
The included USB samples in Proteus 7.5 SP3 do work, so I must be connecting something wrong. |
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geolover
Joined: 08 Feb 2011
Posts: 18
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| Posted: Tue Feb 08, 2011 6:24 pm |
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Thank you matheuslps!
Noob question:
I'm currently trying to implement 18F4550 on Explorer 16 to transmit data to PC with Matlab. It was connected to a 20MHz crystal. How should I reconfigure the code in order to get it working? |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19328
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| Posted: Wed Feb 09, 2011 3:10 am |
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The USB support with 3.249, differs from that on 4.106, taking less space, but creating the last couple of warnings to do so. The USB libraries for V4, won't work with 3.249. You can turn which warnings are given on/off.
With the standard libraries, these warnings are _normal_.
USB, in Proteus is poor. You _can_ get an occasional small program to work, but more fail than do. I have not got a single 'full scale' program that works in the real world, to work in Proteus. As far as I'm concerned, the USB simulation in Proteus, is not worth wasting time on.
Best Wishes |
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geolover
Joined: 08 Feb 2011
Posts: 18
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| Posted: Wed Feb 09, 2011 8:40 am |
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Hello! I used the same code but while I'm trying to install the driver I got error code 10. Do you have any idea why?
To be a little bit more specific:
Sometimes the USB CDC could be successfully installed, but however when I try to access it with putty I got unable to configure COM port message, any idea on why this is happening? |
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neohimura
Joined: 08 Feb 2011
Posts: 14
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| Posted: Thu Feb 10, 2011 3:24 am |
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Hi,
I was able to install the PIC18F4550 USB CDC driver and it works on my laptop with Windows 7 X64. I'm using Visual Basic 2010 to display the data. My problem is the data will freeze after running for ~1 minute. I tried the same codes on a Windows 7 X32 and had the same problem. But it works fine in Windows XP. I tried different value of capacitor for VUSB but no luck. Anyone had this problem? |
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gmua
Joined: 07 Feb 2011
Posts: 11
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| Posted: Fri Feb 11, 2011 1:20 pm |
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| Ttelmah wrote: | The USB support with 3.249, differs from that on 4.106, taking less space, but creating the last couple of warnings to do so. The USB libraries for V4, won't work with 3.249. You can turn which warnings are given on/off.
With the standard libraries, these warnings are _normal_.
USB, in Proteus is poor. You _can_ get an occasional small program to work, but more fail than do. I have not got a single 'full scale' program that works in the real world, to work in Proteus. As far as I'm concerned, the USB simulation in Proteus, is not worth wasting time on.
Best Wishes |
Thanks a lot Ttelmah, I guess it was too good to be true about PROTEUS being able to simulate the USB port a 100%, I will have to do it the old fashion way. |
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gmua
Joined: 07 Feb 2011
Posts: 11
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| Posted: Wed Feb 16, 2011 7:29 pm |
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| Ttelmah wrote: | | USB, in Proteus is poor. You _can_ get an occasional small program to work, but more fail than do. I have not got a single 'full scale' program that works in the real world, to work in Proteus. As far as I'm concerned, the USB simulation in Proteus, is not worth wasting time on. |
Proteus 7.4 SP3 works much better than Proteus 7.5 SP3, I modified and recompiled a C source file (made with CCS version 3.227) with version 4.114 and it worked perfectly (I still got the same normal warnings), the Windows application made with Visual C# 2005 turned the LEDs ON and OFF inside the ISIS simulation like it was supposed to.
The project is a slightly modified version of the PicUSB project found at: http://www.hobbypic.com/
Again, thanks a lot Ttelmah |
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Bilal
Joined: 24 Apr 2010
Posts: 75
Location: Islamabad
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| Posted: Sat Mar 12, 2011 8:36 am |
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its OK to have a .33nF Capacitance at PIN18 instead of 47uF????
_________________
... |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19328
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| Posted: Sat Mar 12, 2011 3:33 pm |
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The recommended value, is _not_ 47uF. 0.47uF. Factor of 100 different.
The data sheet requires a minimum of 0.22uF.
_But_ historically quite a few people have found the USB to be unreliable, with the minimum value, so have doubled it, and used 0.47uF, but 0.33, if a good quality capacitor, is well in spec.
So 0.33uF _ought_ the be OK.
Best Wishes |
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