I'll probably get fried for this, but what the heck, whats life without some risk to pride.

Here is some code that works for me on a SILABS C8051F040, using digital IO to run a noritake GUI140X32F-7000 (3.3V version). This is the test program I used. In the real application, the display is the least critical element. Memory is pretty cheap, so I had (actually have, as this project is temporarily on hold) to minimize the time spent handling the display.

This will definitley not compile for you as is, so don't try. I do have functions set up for writing sigle character to display, polling for completion of write (I hate using delays), clearing the display (this is the only one that actually waits to be done, haven't had time to fix this yet), and a really long funtion that sets up screen formatting (but it runs faster and with less code than using sprintf)

Hope I got the HTML tags right, this is my first time posting code, but will not know until I post it, so here goes.........................

Andy


pre

#include "C:KEILAMSC_C_SOFTAMSC_SRCC8051F04xc8051f040.h"
#include "C:KEILAMSC_C_SOFTAMSC_SRCC8051F04xtiming_1.0.h"
#include "C:KEILAMSC_C_SOFTAMSC_SRCC8051F04xdigital_1.0.h"
#include "C:KEILAMSC_C_SOFTAMSC_SRCC8051F04xana_func_1.0.h"
#include <string.h>
#define VREF 2.5 //voltage reference
sbit PBUSY=P5 ^7;
sbit WRITE=P4 ^6;
sbit READ=P4 ^ 7;
sbit timing=P2^0;
float current,v1,v2,v3;
unsigned int vfd_counter;
xdata unsigned char display[60];
void write_char(char wchar);
bit check_done(void);
void clear_vfd(void);
void make_screen_1(void);
unsigned int AtoD0_get_praw(void);
void main()
{
unsigned int EXC_uC_temp;
unsigned char i;
bit check_once;
disable_watchdog();
external_osc();
TMR3_timer(63693,1); //sets timer 3 to generate interupt every 1mS
xbar(1);
port4_setup(0xC0,0x00,0xC0);
memset(&display,'',sizeof(display));
init_Vref(1,1,1); //turn on referance and internal temp sensor

AtoD0_cntrl_scheme(1); //init A to D
clear_vfd();
vfd_counter=0;
current=123.456;
v1=2.468;
v2=1.357;
v3=3.141;
check_once=0;
EA=1;
while(1)
{

if ((vfd_counter > 1000)&& !check_once)
{
check_once=1;
clear_vfd();
timing=0;
make_screen_1();
timing=1;
EXC_uC_temp=AtoD0_get_praw();
}
if (check_once)
{
if (!check_done())
{
write_char(display[i]);
i++;
if (i == strlen(display))
{
i=0;
check_once=0;
vfd_counter=0;
}
}
}
}
}
void TR3_increment (void) interrupt 14 //timer 3 interupt, called every 1 mS
{
unsigned char SFRPAGE_SAVE;
SFRPAGE_SAVE = SFRPAGE; //Save SFR page context
SFRPAGE=TMR3_PAGE;
TF3=0; //clear interupt
vfd_counter++;

SFRPAGE = SFRPAGE_SAVE;
}
void write_char(char wchar)
{
unsigned char SFRPAGE_SAVE;
SFRPAGE_SAVE = SFRPAGE; //Save SFR page context
SFRPAGE=CONFIG_PAGE;
//port5_setup(0xFF,0x00,0xff); //set to write
P5MDOUT=0xFF; //set to push_pull
PBUSY=1;
READ=1; //disable read,
WRITE=0; //enable write
//write_port5(wchar); //write character to port 5
P5=wchar;
WRITE=1; //DISABLE WRITE
//port5_setup(0x80,0x80,0x00); //set to read
P5MDOUT=0x00; //set to open drain
P5=0xFF;
READ=0; //ENABLE READ
SFRPAGE = SFRPAGE_SAVE;
}
bit check_done(void)
{
unsigned char SFRPAGE_SAVE;
bit checker;
SFRPAGE_SAVE = SFRPAGE; //Save SFR page context
SFRPAGE=CONFIG_PAGE;
checker=PBUSY;
SFRPAGE = SFRPAGE_SAVE;
return checker;
}
void clear_vfd(void)
{
unsigned char SFRPAGE_SAVE;
SFRPAGE_SAVE = SFRPAGE; //Save SFR page context
SFRPAGE=CONFIG_PAGE;
PBUSY=0;
write_char(0x0C);
while (PBUSY);
SFRPAGE = SFRPAGE_SAVE;
}

void make_screen_1(void)
{
unsigned char temper,decer;
display[0]='I';
display[1]='(';
display[2]='A';
display[3]=')';
display[4]='=';

temper=(unsigned char)current;
decer=((unsigned int)(current*10)%10);
display[7]=((unsigned char)(temper%10))+48;
temper=temper /10;
display[6]=((unsigned char)(temper%10))+48;
if (display[6]=='0') display[6]=' ';
temper=temper /10;
display[5]=((unsigned char)(temper%10))+48;
if (display[5]=='0') display[5]=' ';
display[8]='.';
display[9]=decer+48;
display[10]='n';
display[11]='r';

display[12]='V';
display[13]='1';
display[14]='(';
display[15]='V';
display[16]=')';
display[17]='=';

temper=(unsigned char)v1;
decer=((unsigned int)(v1*10)%10);
display[20]=((unsigned char)(temper%10))+48;
temper=temper /10;
display[19]=((unsigned char)(temper%10))+48;
if (display[19]=='0') display[19]=' ';
temper=temper /10;
display[18]=((unsigned char)(temper%10))+48;
if (display[18]=='0') display[18]=' ';
display[21]='.';
display[22]=decer+48;
display[23]='n';
display[24]='r';

display[25]='V';
display[26]='2';
display[27]='(';
display[28]='V';
display[29]=')';
display[30]='=';

temper=(unsigned char)v2;
decer=((unsigned int)(v2*10)%10);
display[33]=((unsigned char)(temper%10))+48;
temper=temper /10;
display[32]=((unsigned char)(temper%10))+48;
if (display[32]=='0') display[32]=' ';
temper=temper /10;
display[31]=((unsigned char)(temper%10))+48;
if (display[31]=='0') display[31]=' ';
display[34]='.';
display[35]=decer+48;
display[36]='n';
display[37]='r';

display[38]='V';
display[39]='3';
display[40]='(';
display[41]='V';
display[42]=')';
display[43]='=';

temper=(unsigned char)v3;
decer=((unsigned int)(v3*10)%10);
display[46]=((unsigned char)(temper%10))+48;
temper=temper /10;
display[45]=((unsigned char)(temper%10))+48;
if (display[45]=='0') display[45]=' ';
temper=temper /10;
display[44]=((unsigned char)(temper%10))+48;
if (display[44]=='0') display[44]=' ';
display[47]='.';
display[48]=decer+48;
display[49]='n';
display[50]='r';
display[51]=0;

}
unsigned int AtoD0_get_praw(void)
{
char_to_int AtoD;
int value;
unsigned char SFRPAGE_SAVE;
SFRPAGE_SAVE = SFRPAGE; //Save SFR page context
SFRPAGE = ADC0_PAGE;
AD0BUSY=1; //start conversion
while(AD0INT==0); //poll for end of conversion
AtoD.bytes[1]=ADC0L;
AtoD.bytes[0]=ADC0H;
AD0INT=0; //reset interupt
value=AtoD.integ;
SFRPAGE = SFRPAGE_SAVE;
return value;
}
/pre