Forums

FX2LP I/O port issue... need help

Started by sylvain.azarian March 20, 2010
Good evening all.
My design has a chip connected to a FX2LP ( 100 pins). The firmware,
written and compiled with SDCC, works except access to the E port...


I've tried several stuffs, like putting my "toggling code" into existing
code and came to the conclusion that something is missing in my
initialization code. In clear : I am not able to read or write to port E.
An oscilloscope connected to any of the 8 pins doesn't show anyhting, pin
stay "silent". 

The code below is what remains after removing everything not related to the
issue... and doesn't work :-(

If any of you has the "good eye" and can tell me what I've missed... that
would help ;-)

===============================================================

#define ALLOCATE_EXTERN
#include "include/fx2regs.h"


#define SYNCDELAY _asm \
		   nop; \
		   nop; \
		   nop; \
		   nop; \
		   nop; \
		   nop; \
		   nop; \
		  _endasm;
static void Initialize(void)
{
    CPUCS=0x12;                  // 48 MHz, CLKOUT output enabled.
    IFCONFIG=0xc0;   SYNCDELAY;  // Internal IFCLK, 48MHz; A,B as normal
ports.
    CKCON &= ~7;
    EXIF &= ~16;
    REVCTL=0x03;     SYNCDELAY;  // See TRM...

    OEA = OEB = OED = 0xff; SYNCDELAY;
    IOA = IOB = IOD = 0xff; SYNCDELAY;
    OEA = OEB = OED = 0xff; SYNCDELAY;
    IOA = IOB = IOD = 0x00; SYNCDELAY;

    EP6CFG=0xe2;     SYNCDELAY;  // 1110 0010 (bulk IN, 512 bytes,
double-buffered)
    FIFORESET=0x80;  SYNCDELAY;  // NAK all requests from host.
    FIFORESET=0x82;  SYNCDELAY;  // Reset individual EP (2,4,6,8)
    FIFORESET=0x84;  SYNCDELAY;
    FIFORESET=0x86;  SYNCDELAY;
    FIFORESET=0x88;  SYNCDELAY;
    FIFORESET=0x00;  SYNCDELAY;  // Resume normal operation.
}



void main(void)
{
    Initialize();

    PORTACFG = 0 ;
    PORTCCFG = 0 ;
    PORTECFG = 0 ; // disable all alternate functions on port E
    SYNCDELAY; 
    IOE = 0x00 ; // 
    OEE = 0xff ; // all pins are outputs
    SYNCDELAY;

    while( 1 ) {
        SYNCDELAY;
	IOE = 0xff ; // all pins should be 1
	SYNCDELAY
	IOE = 0x00 ; // all pins should be 0
    }
}

==== 
Can't see anything on port E... 
thanks

	   
					
---------------------------------------		
Posted through http://www.EmbeddedRelated.com