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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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 Posted: Mon Nov 13, 2006 11:59 am |
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Here's a demo program for the PicDem2-Plus that works.
Use the "Flex_lcd.c" driver that you can get from here. It's already
configured to work with a PicDem2-Plus.
http://www.ccsinfo.com/forum/viewtopic.php?t=24661
This program reads the value of the trimpot, converts it to volts,
and displays it on the LCD on the PicDem2-Plus board. I tested
this with PCM vs. 3.249 and it works OK.
I also installed your version, 3.163, and it works with that one too.
For your version, the "AN0" constant doesn't exist. Use the RA0_ANALOG
constant instead. (They're the same thing).
Change this line
| Code: | | setup_adc_ports(AN0); |
to this:
| Code: | | setup_adc_ports(RA0_ANALOG); |
Then it will compile with vs. 3.163.
| Code: |
#include <16F877.H>
#device adc=10
#fuses XT, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock=4000000)
//#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)
#include "flex_lcd.c"
//============================
void main()
{
int16 adc_value;
float volts;
lcd_init();
setup_adc_ports(AN0);
setup_adc(ADC_CLOCK_DIV_8);
set_adc_channel(0);
while(1)
{
adc_value = read_adc();
volts = (float)(adc_value * 5)/1023.0;
printf(lcd_putc, "\f%3.2f", volts);
delay_ms(500);
}
} |
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Ttelmah
Guest
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| Posted: Mon Nov 13, 2006 3:29 pm |
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The answer to the array size, is simple. A _string_, always needs one more character than the number in the text, for the '\0' terminator character.
Best Wishes |
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new2ccs
Joined: 29 Oct 2006
Posts: 10
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| Posted: Tue Nov 14, 2006 9:58 am |
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thanks for the code, but suddenly my program works now. Maybe I changed the line in my loop from i =16 after the if statement to BREAK;
| Code: | void display(char arr[])
{
int i;
for( i = 0; i <16; i++ )
{
if( arr[i] == '\0')
break;
else
lcd_write_data(1,arr[i]);
}
} |
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new2ccs
Joined: 29 Oct 2006
Posts: 10
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| address lines picdem 2+ |
| Posted: Wed Nov 15, 2006 3:39 pm |
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I have a question about the address lines of the LCD. In the data sheet of hd44780U says line 2 = 0x40 and line 1 = 0X00, but when debugging the flex.c code. i notice that line 1 = 0xff and line 2 =0xbf. Why not line 1 = 00 and line 2 =40.
HD44780U
00 01 02 03 04 05 06 07 08 09 0A 0B0C0D0E 27
40 41 42 43 44 45 46 47 48 49 4A 4B4C4D4E 4F |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Wed Nov 15, 2006 3:47 pm |
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| Quote: | | when debugging the flex.c code. i notice that line 1 = 0xff and line 2 =0xbf |
In the lcd_gotoxy() function, it sets the address to 0x00 for line 1
and to 0x40 for line 2. |
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