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Ttelmah
Joined: 11 Mar 2010
Posts: 20061
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 Posted: Wed Aug 19, 2015 3:34 am |
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Take a step back.
Try running one of the example programs like the ex_usb_serial.c
Try sending this data from a terminal package, and verify it echo's back. Try typing for a minute or two, and see if it stops.
If it does, there is a hardware problem. A spike or something. If however it keeps working, then you have narrowed the problem down to being something in the software. |
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art
Joined: 21 May 2015
Posts: 181
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| Posted: Wed Aug 19, 2015 10:15 pm |
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Hi Ttelmah,
Thank you very much for ex_usb_serial.c idea. It works perfectly!!!.
I've modified the example and it also works without any com disconnecting problem. However i need to add command below to make it works:
| Code: |
If(usb_cdc_kbhit())
{
c=usb_cdc_getc();
if (c=='\n') {putc('\r'); putc('\n');}
if (c=='\r') {putc('\r'); putc('\n');}
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What is this command purpose? Hope you explain to me. My code as shown below:
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#include <18F4550.h>
#fuses HSPLL,NOPROTECT,NOLVP,NODEBUG,USBDIV,PLL5,CPUDIV1,VREGEN
#use delay(clock=48000000)
#use rs232(baud=9600,xmit=PIN_C6,rcv=PIN_C7)
#include <string.h>
#include <input.c>
#include <stdio.h>
#include <stdlib.h>
#include <usb_cdc.h>
void main(void)
{
int8 binary_string[10];
char c;
usb_init_cs();
while(TRUE)
{
usb_task();
If(usb_cdc_kbhit())
{
c=usb_cdc_getc();
if (c=='\n') {putc('\r'); putc('\n');}
if (c=='\r') {putc('\r'); putc('\n');}
while(true)
{
printf(usb_cdc_putc,"Enter 8 binary number : \n");
get_string_usb(binary_string,9);
output_D((int8)strtoul(binary_string,0,2));
}
}
}
} |
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Ttelmah
Joined: 11 Mar 2010
Posts: 20061
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| Posted: Thu Aug 20, 2015 2:39 am |
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kbhit, is exactly like the normal RS232 kbhit. It returns 'true' if a character has arrived on the link.
Adding this means the code won't go into your numeric 'wait' loop, till data has actually been seen arriving. Means that usb_task will be continuously called, _until_ this has happened.
As I've said before, usb_task does some USB housekeeping, and it looks as if stopping this housekeeping before data has arrived, leads to a problem. |
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art
Joined: 21 May 2015
Posts: 181
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| Posted: Thu Aug 20, 2015 4:08 am |
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Hai Ttelmah,
Thank you very much once again for your explanation.
Problem solve  |
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