PIC to LCD - again

[sokrates]

Hello,

I am working on a senior design project that will use 18F452. Project will include A/D conversion at some point.

I will have relatively simple questions and I hope somebody could reply me
I am using CCS C 4.023 (our school has a licence) and I am just trying to send A/D data to an LCD.

I tried to use PIC Wizard as an aid, but I think it adds some unnecessary "disable" lines so I removed some of them.

My code is

[PCM programmer]

This is not a Proteus board.

But, with regard to your C program, I see a few problems.

[mskala]

I've just done this recently. I was using ports D and E, but will work with any. From your pin definitions, you are using the Motorola M68-type format. If you need specs for this type of parallel interface, google it.

I was using 8 bits, but 4 bits is similar, you will need to use 2 cycles of the E bit rather than 1.

Here are the segments of code:

#define VFD_RW PIN_E0
#define VFD_E PIN_E1
#define VFD_RS PIN_E2

void vfd_w_inst(int8 value) // write instruction
{
output_low(VFD_RS);
output_low(VFD_RW);
output_high(VFD_E);
output_d(value);
output_low(VFD_E);
}

void vfd_w_data(int8 value) // write data
{
output_high(VFD_RS);
output_low(VFD_RW);
output_high(VFD_E);
output_d(value);
output_low(VFD_E);
}

void initdisp() // initialize display after power up
{
vfd_w_inst(0x3c); // function set, necessary first command
delay_us(2);
vfd_w_inst(0x0c); // display on, no cursor, no blink
delay_us(2);
vfd_w_inst(0x01); // clear display
delay_us(2);
vfd_w_inst(0x03); // cursor home
delay_us(2);
vfd_w_inst(0x06); // entry mode set
delay_us(2);
}

void displaynumber2(int8 num) // displays 8-bit number in decimal always 3 dig
{
int8 copy,a,b,c;

a=num/100;
copy=num-(a*100);
b=copy/10;
c=copy-(b*10);
vfd_w_data(a+48);
vfd_w_data(b+48);
vfd_w_data(c+48);
}

----
anywhere after initializing you can send characters as:
vfd_w_data('V');
vfd_w_data('a');
vfd_w_data('l');
vfd_w_data('u');
vfd_w_data('e');
vfd_w_data('=');
vfd_w_data(' ');


Good luck