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jayanthd
Joined: 06 Dec 2012
Posts: 47
Location: Banned - pirate
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| Why this lcd and adc code not working? |
 Posted: Wed Mar 20, 2013 11:47 am |
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Here is my CCS C code for PIC16F877 device. If I try to include 16F877.h file it gives error while compiling. I have used the Project Wizard to create the project. I am testing on real hardware.
| Code: | #include <main.h>
#include <ctype.h>
#include <float.h>
#include <math.h>
#include <stdio.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#use delay(clock=20000000)
#FUSES NOWDT //No Watch Dog Timer
#FUSES HS //High speed Osc (> 4mhz for PCM/PCH) (>10mhz for PCD)
#FUSES NOPUT //No Power Up Timer
#FUSES NOBROWNOUT //No brownout reset
#FUSES NOLVP //No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O
#FUSES NOCPD //No EE protection
#FUSES NOWRT //Program memory not write protected
#FUSES NODEBUG //No Debug mode for ICD
#FUSES NOPROTECT //Code not protected from reading
#define LCD_ENABLE_PIN PIN_B2 ////
#define LCD_RS_PIN PIN_B0 ////
#define LCD_RW_PIN PIN_B1 ////
#define LCD_DATA4 PIN_B3 ////
#define LCD_DATA5 PIN_B4 ////
#define LCD_DATA6 PIN_B5 ////
#define LCD_DATA7 PIN_B6
#include <lcd.c>
void main()
{
float voltage = 0;
set_tris_a(0b11111111);
set_tris_b(0b00000000);
setup_adc(ADC_CLOCK_INTERNAL);
setup_adc_ports(ALL_ANALOG);
lcd_init();
delay_ms(250);
lcd_putc("\fReady...\n");
lcd_gotoxy(1,1);
printf(lcd_putc,"ADC Example");
lcd_gotoxy(1,2);
delay_ms(2000);
set_adc_channel(0);
delay_us(20);
while(TRUE)
{
voltage=read_adc();
delay_us(50);
printf(lcd_putc,"%lu",voltage);
}
} |
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temtronic
Joined: 01 Jul 2010
Posts: 9163
Location: Greensville,Ontario
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| Posted: Wed Mar 20, 2013 12:03 pm |
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First line of your program should be the processor type, which is not shown in the program you've posted.
You don't say what the error is ! Very hard to diagnose without it.
aside from that several minor details
1) you've included a lot of unnesceeary headers...
2) never use adc_clock_internal.read the ADC section in the datasheet
3) always add 'errors' to the use rs232(...options...)
4) always select PUT, not NOPUT
5) always delay 1000ms before and after doing lcd_init()
6) do not use set_tris.(...) functions, let compiler do it for you
7) change delay in loop to 1 second( LCDs are slow !!)
hth
jay |
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jayanthd
Joined: 06 Dec 2012
Posts: 47
Location: Banned - pirate
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| Posted: Wed Mar 20, 2013 12:28 pm |
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| temtronic wrote: | First line of your program should be the processor type, which is not shown in the program you've posted.
You don't say what the error is ! Very hard to diagnose without it.
aside from that several minor details
1) you've included a lot of unnesceeary headers...
2) never use adc_clock_internal.read the ADC section in the datasheet
3) always add 'errors' to the use rs232(...options...)
4) always select PUT, not NOPUT
5) always delay 1000ms before and after doing lcd_init()
6) do not use set_tris.(...) functions, let compiler do it for you
7) change delay in loop to 1 second( LCDs are slow !!)
hth
jay |
Thank you for quick reply. The device header is included in the main.h file. The problem is LCD displays nothing and hence I don't know whether adc is working or not. Here is my project files. Please check it.
http://uppit.com/rq17uzztj382/adc.rar |
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temtronic
Joined: 01 Jul 2010
Posts: 9163
Location: Greensville,Ontario
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| Posted: Wed Mar 20, 2013 1:13 pm |
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Sorry but your link goes to a site that wants me to download some 'toolbar' and I'm not going to do that.
For small programs like yours, it's best to put the main.h code into main.c,typically it's only 4-10 lines of 'setup'.
At first you said compiling gave an error, now you say the LCD doesn't work....
Typically LCD modules 'don't work' for
1) wrong bias voltage on Vee(typically .6 V should produce black squares)
2) wrong pin designations,those must be before the driver is loaded,unless you're using the defaults listed within the driver
3) Vcc not 5 volts. Seems 99.999% of LCD modules are 5 volt and won't run if tied to 3 volt PICs.
Also noticed...
You've defined 'voltage' to be a float yet print it out as a long unsigned integer. Since read_adc() sends either 8 bit or 10 bit data, 'voltage' should be either an Unsigned INT8 or Unsigned INT16.
hth
jay |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19333
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| Posted: Wed Mar 20, 2013 1:34 pm |
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As a general comment, the order of things in CCS should always be:
Processor definition or the include file containing this.
Fuses
Clock definition
Serial definition if used
Other includes
Some parts of many include files (stdio for example), _require_ the RS232 definitions first. Similarly anything using delays, required the clock definitions first.
In the case given, most of the includes are not being used, so it won't cause a problem, but for any future project it _will_.
Best Wishes |
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asmboy
Joined: 20 Nov 2007
Posts: 2128
Location: albany ny
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| Posted: Wed Mar 20, 2013 2:07 pm |
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Can you post the schematic??
Just in case there is a wiring mistake?
( we all make them from time 2 time )  |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19333
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| Posted: Wed Mar 20, 2013 3:25 pm |
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and (of course), the old comment, do a simple 'flash an LED' test to prove the processor is running (and running at the speed you expect), before trying anything this complex.
Best Wishes |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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jayanthd
Joined: 06 Dec 2012
Posts: 47
Location: Banned - pirate
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| Posted: Wed Mar 20, 2013 10:54 pm |
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| asmboy wrote: | Can you post the schematic??
Just in case there is a wiring mistake?
( we all make them from time 2 time ) |
Thanks everybody. I have tried all things you said but it doesn't work. Here is my schematic. I am testing in real hardware but made the schematic in Proteus. I have blinked the led and it works.
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jayanthd
Joined: 06 Dec 2012
Posts: 47
Location: Banned - pirate
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| Posted: Wed Mar 20, 2013 10:56 pm |
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| Ttelmah wrote: | As a general comment, the order of things in CCS should always be:
Processor definition or the include file containing this.
Fuses
Clock definition
Serial definition if used
Other includes
Some parts of many include files (stdio for example), _require_ the RS232 definitions first. Similarly anything using delays, required the clock definitions first.
In the case given, most of the includes are not being used, so it won't cause a problem, but for any future project it _will_.
Best Wishes |
My definitions are correct except that include of 16f877.h is in main.h as I used the project wizard to generate the project files. |
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jayanthd
Joined: 06 Dec 2012
Posts: 47
Location: Banned - pirate
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| Posted: Wed Mar 20, 2013 10:57 pm |
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Where can I get flex_lcd.c? Does that mean lcd.c of CCS C have problems? |
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SSR
Joined: 09 Nov 2011
Posts: 14
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| Posted: Thu Mar 21, 2013 12:17 am |
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| jayanthd wrote: |
Where can I get flex_lcd.c? Does that mean lcd.c of CCS C have problems? |
You don't need to define pins if you are using <lcd.c>. Connect them in order they are defined in the driver file. | Code: |
As defined in the following structure the pin connection is as follows:
// D0 enable
// D1 rs
// D2 rw
// D4 D4
// D5 D5
// D6 D6
// D7 D7
//
// LCD pins D0-D3 are not used and PIC D3 is not used.
// Un-comment the following define to use port B
// #define use_portb_lcd TRUE |
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SSR
Joined: 09 Nov 2011
Posts: 14
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ckielstra
Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands
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| Posted: Thu Mar 21, 2013 1:28 am |
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Are you really using the PIC16F877 ? I never downloaded the datasheet for that chip, meaning the last 10 years no serious question was asked for this chip.
However, only one letter difference, the PIC16F877A is the most popular chip on this forum. One of the changes between these chips is in the ADC configuration... |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19333
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| Posted: Thu Mar 21, 2013 1:43 am |
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| jayanthd wrote: | | Ttelmah wrote: | As a general comment, the order of things in CCS should always be:
Processor definition or the include file containing this.
Fuses
Clock definition
Serial definition if used
Other includes
Some parts of many include files (stdio for example), _require_ the RS232 definitions first. Similarly anything using delays, required the clock definitions first.
In the case given, most of the includes are not being used, so it won't cause a problem, but for any future project it _will_.
Best Wishes |
My definitions are correct except that include of 16f877.h is in main.h as I used the project wizard to generate the project files. |
Seriously, 'using the wizard', does _not_ make things right. It has a _lot_ of bugs. For instance, it'll use 'SPI_SS_DISABLED' as a setting to the SPI, when nothing else is selected, which is invalid.
The wizard, is also completely dependant on what _you_ tell it. So (for instance), you can say you are running your chip at 40MHz, using an XT crystal. The Wizard won't complain, yet this is completely invalid.
Much better to use the example programs, copy the layouts they use, and ignore the wizard. I'd start by 'shooting the wizard', if you want to get code that works right....
In fact though, the wizard does not arrange things as you show, and this may suggest a problem.
The wizard puts the clock settings into the first definition file, so the order it generates is
Processor definition or the include file containing this.
included in the above Fuses
included in the above Clock definition
included in the above Serial definition if used
Other includes
It keeps the actual loading order exactly as I describe, and does _not_ put the fuse/clock definitions after the includes as you have.
Best Wishes |
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