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muahaha95
Guest
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| Still solution is finding |
 Posted: Sat Oct 15, 2005 8:40 am |
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I used PICDEM 2 PLUS and 18f452
still lcd does not work.what do you think about it?
| Code: |
#INCLUDE <18F452.H>
#CASE
#USE DELAY(CLOCK=4000000) //********************************* ! ! ! ! ! !
#FUSES HS,NOWDT,NOPROTECT,NOLVP
#DEFINE VER_MAJOR 0
#DEFINE VER_MINOR 01
#USE RS232(BAUD=19200,XMIT=PIN_E0,INVERT,STREAM=DEBUG)
#ZERO_RAM
int8 data;
//======================= MAIN ============================//
#define LCD_DB4 PIN_D0
#define LCD_DB5 PIN_D1
#define LCD_DB6 PIN_D2
#define LCD_DB7 PIN_D3
#define LCD_E PIN_A1
#define LCD_RS PIN_A3
#define LCD_RW PIN_A2
// If you only want a 6-pin interface to your LCD, then
// connect the R/W pin on the LCD to ground, and comment
// out the following line.
#define USE_LCD_RW 1
//========================================
#define lcd_type 2 // 0=5x7, 1=5x10, 2=2 lines
#define lcd_line_two 0x40 // LCD RAM address for the 2nd line
int8 const LCD_INIT_STRING[4] =
{
0x20 | (lcd_type << 2), // Func set: 4-bit, 2 lines, 5x8 dots
0xc, // Display on
1, // Clear display
6 // Increment cursor
};
//-------------------------------------
void lcd_send_nibble(int8 nibble)
{
// Note: !! converts an integer expression
// to a boolean (1 or 0).
output_bit(LCD_DB4, !!(nibble & 1));
output_bit(LCD_DB5, !!(nibble & 2));
output_bit(LCD_DB6, !!(nibble & 4));
output_bit(LCD_DB7, !!(nibble & 8));
delay_cycles(1);
output_high(LCD_E);
delay_us(2);
output_low(LCD_E);
}
//-----------------------------------
// This sub-routine is only called by lcd_read_byte().
// It's not a stand-alone routine. For example, the
// R/W signal is set high by lcd_read_byte() before
// this routine is called.
#ifdef USE_LCD_RW
int8 lcd_read_nibble(void)
{
int8 retval;
// Create bit variables so that we can easily set
// individual bits in the retval variable.
#bit retval_0 = retval.0
#bit retval_1 = retval.1
#bit retval_2 = retval.2
#bit retval_3 = retval.3
retval = 0;
output_high(LCD_E);
delay_cycles(1);
retval_0 = input(LCD_DB4);
retval_1 = input(LCD_DB5);
retval_2 = input(LCD_DB6);
retval_3 = input(LCD_DB7);
output_low(LCD_E);
return(retval);
}
#endif
//---------------------------------------
// Read a byte from the LCD and return it.
#ifdef USE_LCD_RW
int8 lcd_read_byte(void)
{
int8 low;
int8 high;
output_high(LCD_RW);
delay_cycles(1);
high = lcd_read_nibble();
low = lcd_read_nibble();
return( (high<<4) | low);
}
#endif
//----------------------------------------
// Send a byte to the LCD.
void lcd_send_byte(int8 address, int8 n)
{
output_low(LCD_RS);
#ifdef USE_LCD_RW
while(bit_test(lcd_read_byte(),7)) ;
#else
delay_us(60);
#endif
if(address)
output_high(LCD_RS);
else
output_low(LCD_RS);
delay_cycles(1);
#ifdef USE_LCD_RW
output_low(LCD_RW);
delay_cycles(1);
#endif
output_low(LCD_E);
lcd_send_nibble(n >> 4);
lcd_send_nibble(n & 0xf);
}
//----------------------------
void lcd_init(void)
{
int8 i;
output_low(LCD_RS);
#ifdef USE_LCD_RW
output_low(LCD_RW);
#endif
output_low(LCD_E);
delay_ms(15);
for(i=0 ;i < 3; i++)
{
lcd_send_nibble(0x03);
delay_ms(5);
}
lcd_send_nibble(0x02);
for(i=0; i < sizeof(LCD_INIT_STRING); i++)
{
lcd_send_byte(0, LCD_INIT_STRING[i]);
// If the R/W signal is not used, then
// the busy bit can't be polled. One of
// the init commands takes longer than
// the hard-coded delay of 60 us, so in
// that case, lets just do a 5 ms delay
// after all four of them.
#ifndef USE_LCD_RW
delay_ms(5);
#endif
}
}
//----------------------------
void lcd_gotoxy(int8 x, int8 y)
{
int8 address;
if(y != 1)
address = lcd_line_two;
else
address=0;
address += x-1;
lcd_send_byte(0, 0x80 | address);
}
//-----------------------------
void lcd_putc(char c)
{
switch(c)
{
case '\f':
lcd_send_byte(0,1);
delay_ms(2);
break;
case '\n':
lcd_gotoxy(1,2);
break;
case '\b':
lcd_send_byte(0,0x10);
break;
default:
lcd_send_byte(1,c);
break;
}
}
//------------------------------
#ifdef USE_LCD_RW
char lcd_getc(int8 x, int8 y)
{
char value;
lcd_gotoxy(x,y);
// Wait until busy flag is low.
while(bit_test(lcd_read_byte(),7));
output_high(LCD_RS);
value = lcd_read_byte();
output_low(LCD_RS);
return(value);
}
#endif
void main(void)
{
setup_adc_ports(NO_ANALOGS);
set_tris_a(0);set_tris_b(0);set_tris_c(0);set_tris_d(0);
fprintf(DEBUG,"STARTING CRI Test.\n\r");
fprintf(DEBUG,"FIRMWARE VERSION %u.%02u\n\r",VER_MAJOR,VER_MINOR);
lcd_init();
printf(lcd_putc,"TEST");
while(TRUE){
}
}
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Sat Oct 15, 2005 12:16 pm |
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You program worked for me, even though a few things are not completely
correct. You don't need to set the TRIS, because you're using Standard
i/o mode, which is the default mode for the CCS compiler. Because
the PicDem2-Plus uses an oscillator instead of a crystal, the oscillator
fuse should really be EC or EC_IO, instead of HS.
But even without any of the changes I suggested above, your program
runs OK on my board. It displays this on the LCD:
TEST
---------------------
Questions:
1. Does the RS232 work ? Does it display this in the terminal window
on your PC:
STARTING CRI Test.
FIRMWARE VERSION 0.01
2. I asked in a previous post if you really have a PicDem2-Plus board.
Can you look on your board and see what is the name of the board ?
Does it say this:
| Quote: |
PICDEM 2 PLUS
DEMO BOARD
|
I wonder if you really have a PicdDem2-Plus. That's because it has
a serial port on Pins C6 and C7, and it has a MAX232A chip and a
DB-9 connector. That's put there by Microchip for debugging.
You don't need a soft UART on Pin E0. |
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muahaha95
Guest
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| to PIC PROGRAMMER |
| Posted: Sat Oct 15, 2005 1:57 pm |
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Firstly thanks for your helps
I used PICDEM 2 PLUS DEMO BOARD
BUT I dont know what is rs232? |
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muahaha95
Guest
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| about rs232 |
| Posted: Sat Oct 15, 2005 2:03 pm |
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| I provide energy olny from usb.I do not use rs232 cable . |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Sat Oct 15, 2005 2:32 pm |
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| Quote: | | BUT I dont know what is rs232? |
If you don't know what RS232 is, then why do you have statements
in your program that use RS232 ?
#FUSES HS,NOWDT,NOPROTECT,NOLVP
#DEFINE VER_MAJOR 0
#DEFINE VER_MINOR 01
#USE RS232(BAUD=19200,XMIT=PIN_E0,INVERT,STREAM=DEBUG)
#ZERO_RAM
fprintf(DEBUG,"STARTING CRI Test.\n\r");
fprintf(DEBUG,"FIRMWARE VERSION %u.%02u\n\r",VER_MAJOR,VER_MINOR);
I am going to give up. Someone else will have to help you. |
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Mark
Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA
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| Re: about rs232 |
| Posted: Sat Oct 15, 2005 5:35 pm |
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| muahaha95 wrote: | | I provide energy olny from usb.I do not use rs232 cable . |
Board doesn't have USB. You must mean through the ICD2 which is connected to the USB port.
Measure the 5V and make sure its there. There is a green LED that lights up.
Is the clock oscillator installed?
Is the ICD2 setup as a programmer or Debugger?
If you have it setup as a programmer, then you must release the reset line when you keep the ICD2 connected, which you are since it is powering the board. There is a tool bar button to do that in MPLAB. I assume that you went into the ICD2 settings and told it to supply the power. Also make sure that you have the external power supply connected to the ICD2. |
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