 |
 |
| View previous topic :: View next topic |
| Author |
Message |
vortexe90
Joined: 26 Feb 2013
Posts: 30
Location: Algeria
|
| D+ and D- as standard output |
 Posted: Tue May 21, 2013 3:31 pm |
 |
|
I used a 18F4550 and I put LED connect to the USB port (D + and D-) and PIN_C4 PIN_C5 respectively, but both PIN not want to set as output.
is there a configuration that make these two PIN as standard output.
this is the configuration that i used....
| Code: | #include <18F4550.h>
#device adc=10
#FUSES NOWDT //No Watch Dog Timer
#FUSES WDT128 //Watch Dog Timer uses 1:128 Postscale
#FUSES PLL1 //No PLL PreScaler
#FUSES CPUDIV1 //No System Clock Postscaler
#FUSES USBDIV //USB clock source comes from PLL divide by 2
#FUSES HS //High speed Osc (> 4mhz for PCM/PCH) (>10mhz for PCD)
#FUSES NOFCMEN //Fail-safe clock monitor disabled
#FUSES NOIESO //Internal External Switch Over mode disabled
#FUSES NOPUT //No Power Up Timer
#FUSES NOBROWNOUT //No brownout reset
#FUSES BORV20 //Brownout reset at 2.0V
#FUSES NOVREGEN //USB voltage regulator disabled
#FUSES NOPBADEN //PORTB pins are configured as digital I/O on RESET
#FUSES NOLPT1OSC //Timer1 configured for higher power operation
#FUSES NOMCLR //Master Clear pin used for I/O
#FUSES NOSTVREN //Stack full/underflow will not cause reset
#FUSES NOLVP //No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O
#FUSES ICPRT //ICPRT enabled
#FUSES NOXINST //Extended set extension and Indexed Addressing mode disabled (Legacy mode)
#FUSES NODEBUG //No Debug mode for ICD
#FUSES NOPROTECT //Code not protected from reading
#FUSES NOCPB //No Boot Block code protection
#FUSES NOCPD //No EE protection
#FUSES NOWRT //Program memory not write protected
#FUSES NOWRTC //configuration not registers write protected
#FUSES NOWRTB //Boot block not write protected
#FUSES NOWRTD //Data EEPROM not write protected
#FUSES NOEBTR //Memory not protected from table reads
#FUSES NOEBTRB //Boot block not protected from table reads
#use delay(clock=20000000)
#use delay(crystal=20000000)
#use rs232(baud=19200,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8,stream=gsm)
#use RS232(baud=9600,parity=N,xmit=PIN_D1,bits=8,stream=xbee)
#use fixed_io(c_outputs=PIN_C4, PIN_C5) |
|
|
 |
PCM programmer
Joined: 06 Sep 2003
Posts: 21708
|
|
|
temtronic
Joined: 01 Jul 2010
Posts: 9243
Location: Greensville,Ontario
|
|
| Posted: Tue May 21, 2013 5:32 pm |
|
|
this is one of those 'you GOTTA read the manual/datasheet' themes...
as cut and pasted from the PIC18F4550 datasheet...
Page 15, Table 1-2
...
RC4/D-/VM
RC4
DVM
15
I
I/O
I
TTL
—
TTL
Digital input.
USB differential minus line (input/output).
External USB transceiver VM input.
RC5/D+/VP
RC5
D+
VP
16
I
I/O
O
TTL
—
TTL
Digital input.
USB differential plus line (input/output).
External USB transceiver VP input.
...clearly states what the pins can be used for.
NOT all PIC pins can be used for outputs and inputs !!
hth
jay |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
|
Powered by phpBB © 2001, 2005 phpBB Group
|
FAQ 
Search
Register
Profile 
Log in to check your private messages 
Log in
