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Hi all,

I found that there is a missing byte found when receiving data from PIC18F4550 (in USB CDC).

Problem description:
When C# program is receiving data from 18F4550 in which firmware is wr ...

HI PCM programmer,

From my program, I wrote the USB function base on the example "ex_usb_serial.c". In its content, it just call the "usb_cdc.h",
is the USB function called by ...

I got lost about the problem....
Is there any other problem in my program?
Please help~
thx

I thought you needed a 24MHz oscillator for USB operation

Hi Andrew,

Can you tell me more about why should I need 24MHz oscillator for USB operation?
Thanks

#include <18F4550.h>
#device HIGH_INTS=TRUE
#fuses HS, NOWDT, NOPROTECT, NOLVP, VREGEN, USBDIV, PLL5, CPUDIV1, NODEBUG
#use delay (clock=20000000)

#priority INT_TIMER3, INT_ ...

Hi,

I am facing another problem now. The MCU will hang while
communicating with PC through USB, and I have tried to create a
watchdog counter by using timer interrupt for preventing the dead ...

Hi

Thank you for reference.
I have read thought the threads, but I still cannot make clear about the USB interrupt.

However, I have narrowed the area of the problem that the timer1 interrupt is ...

Hi all,

I am going to write a program with timer1 interrupt at highest priority, and use I2C and USB functions also.

I have set the priority as following:

#priority INT_TIMER1, INT_USB, INT_S ...

Thank you, the problem is solved Smile

Hi all,
I am going to use 18F4550 for controlling the two servo throught USB by enter command from PC.
In the beginning, I wrote the code for self controlling the servos, the result is ok.
Here is ...