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USB CDC Help

 
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Zezem



Joined: 02 Mar 2017
Posts: 7

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USB CDC Help
PostPosted: Mon Mar 06, 2017 2:31 pm     Reply with quote
So I've been trying to get this pretty basic CDC project working but have ran out of ideas.

INFO:
PIC: 18F4550
Crystal 8 MHZ
Microchip Explorer 8 Dev Board

I think my fuses aren't set up right... I can't seem to get past usb_enumerated()

THANKS ALOT

Code:

#include <18f4550.h>
#include "globals.h"
#include<usb.h>
#include<usb_cdc.h>
#include <pic18_usb.h>
#include <stdlib.h>


#fuses HSPLL        //High Speed Crystal/Resonator with PLL enabled
#fuses NOPROTECT    //Code not protected from reading
#fuses NOLVP        //No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O
#fuses NODEBUG      //No Debug mode for ICD
#fuses USBDIV      //USB clock source comes from PLL divide by 2
#fuses CPUDIV1      //No System Clock Postscaler
#fuses PLL5         //PLL5 Divide By 5(20MHz oscillator input)



#use delay(clock = 48Mhz,USB_FULL)
//Set up UARTs.
#use rs232(UART1, baud=9600, errors)
//#use rs232(baud=9600, errors)
//#use rs232(baud=1000,FLOAT_HIGH,xmit=PIN_B0,rcv=PIN_B0)


void main(void) {
    usb_init();  //used to init usb port with a device that powers itself. same as usb_init otherwise.
    usb_cdc_init();  //
    int1 usb_cdc_oldconnected=FALSE;
    int i = 0;
    int new_connected;
    int new_enumerated;
    int new_cdc;


   
    while(TRUE)
    {     
        if(usb_attached())
        {
            usb_task();
            if(usb_enumerated())
            {
                if(usb_cdc_carrier.dte_present)
                {
                    if(usb_cdc_oldconnected == FALSE)
                    {
                        printf(usb_cdc_putc,"Hello World!\n\r");
                        usb_cdc_oldconnected = TRUE;
                    }
                    if(usb_cdc_kbhit())
                    {
                        usb_cdc_putc(toupper(usb_cdc_getc()));
                    }
                }
            }
        }else
        {
            usb_cdc_oldconnected = FALSE;
            usb_cdc_init();
        }

    }
    return;
}
Ttelmah



Joined: 11 Mar 2010
Posts: 19451

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PostPosted: Mon Mar 06, 2017 2:50 pm     Reply with quote
1) Fuses & clock should be above all the includes, except for the processor one.

The general layout in CCS C should always be:

Processor define or include
#DEVICE statements
#FUSE
#USE DELAY
#PIN SELECT's (if chip uses PPS)
#USE statements

Then includes

Then code.

Code included before clock statements, will often not function correctly...

2) Do you have a USB_ATTACHED connection?.
This is _required_ by USB, unless the device is powered from the USB cable. Usb_attached _wants_ this.

3) Generally keep to the original C standard, and declare variables at the start of code sections. Though CCS will accept them later, this can cause unexplained problems. It's a case of "keep to the standard, it's safer".

4) You have the code setup for a 20MHz crystal. It says this in the comments, yet you have an 8Mhz crystal. You need PLL2 for an 8MHz crystal.
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