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grovetl
Joined: 29 Oct 2009
Posts: 1
Location: Pittsburgh
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| 16F688 and 2x16 LCD |
 Posted: Wed Nov 18, 2009 10:56 am |
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Neither port A or port C have 8 GPIO pins so, in order to connect the LCD module that I have I must use pins from both ports. After reading through the comments in LCD.c it looks like it allows "pin access". The example shows that all one must do to enable pin access is assign GPIO pins to LCD pins. That seemed logical so I did it but it still seems to want me to assign a port.
I was able to use the flex LCD driver with success. I could continue to do this, however, I'm looking to stick with the CCS supplied driver. Could someone shed some light on whether or not the stock LCD.c driver will actually work with multiple ports? Thanks. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Wed Nov 18, 2009 12:57 pm |
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Post your test program. Post a list of the modifications that you have
made to the CCS driver, to incorporate your pin list. Don't post the
driver. We have it on our systems. Post a little "Hello World" LCD
program that shows how you are testing the problem. It must compile
with no errors. Also post your compiler version. |
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GOBER
Guest
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| Posted: Thu Dec 31, 2009 3:37 am |
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| pls can you post your flex lcd program +16f688 because i tried flexdriver and it worked excellent untill i used 16f688, i think i'm missing something pls as soon as possible i'm working on a project and it has been tooooooooooooooooo late |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Thu Dec 31, 2009 12:38 pm |
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Post your list of #define statements that go at the top of the Flex lcd
driver, which show the connections between the PIC and the LCD.
Also post your compiler version. |
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GOBER
Guest
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| Posted: Sat Jan 02, 2010 7:26 am |
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My test program is:
| Code: |
void main()
{
//these are generated using the wizard
setup_adc_ports(NO_ANALOGS|VSS_VDD);
setup_adc(ADC_OFF);
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
setup_timer_1(T1_DISABLED);
setup_comparator(NC_NC_NC_NC);
setup_vref(FALSE);
setup_oscillator(OSC_8MHZ);
//i added this line because i notices the wizard generates no code for the i/o selection
SET_TRIS_C(0x00);
lcd_init();
lcd_putc(" hello world ");
}
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PS: I use the PIC wizard. I included the header file and the flex driver as well.
The lcd pin connection is:
| Code: |
#define LCD_DB4 PIN_C0
#define LCD_DB5 PIN_C3
#define LCD_DB6 PIN_C4
#define LCD_DB7 PIN_C5
#define LCD_E PIN_C1
#define LCD_RS PIN_C2
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PCM Programmer, I will be absolutely extremely very highly thankful if you can figure out what I'm missing (hope it's not some foolish mistake  ) |
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GOBER
Guest
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| Posted: Sat Jan 02, 2010 7:28 am |
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| Sorry PCM Programmer forgot to mention that the compiler version is the latest version (4.104) because i have it original not cracked and i always update it |
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bkamen
Joined: 07 Jan 2004
Posts: 1611
Location: Central Illinois, USA
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| Posted: Sat Jan 02, 2010 1:19 pm |
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You have no LCD_RW pin assigned.
Are you forcing the LCD to write-only?
-Ben
_________________
Dazed and confused? I don't think so. Just "plain lost" will do. :D |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Sun Jan 03, 2010 1:46 pm |
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Expanding on what bkamen said, are you using the 6-pin interface mode ?
Do you have this line commented out, in the flex_lcd.c driver ?
| Quote: | | //#define USE_RW_PIN 1 |
You need to have it commented out for 6-pin interface mode.
Also, in the 6-pin mode, you need to connect the R/W pin on the LCD
to ground. Do you have that connection ?
| Quote: | //these are generated using the wizard
setup_adc_ports(NO_ANALOGS|VSS_VDD);
setup_adc(ADC_OFF);
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
setup_timer_1(T1_DISABLED);
setup_comparator(NC_NC_NC_NC);
setup_vref(FALSE);
setup_oscillator(OSC_8MHZ); |
None of this Wizard code is necessary. The built-in startup code
(inserted by the compiler) already sets the analog pins to be all digital,
and it already disables the comparators and vref. I looked at the .LST
file for vs. 4.104 and saw this. The other modules such as Timers
are not needed or are already disabled upon power-on reset anyway.
Delete all the lines above.
| Quote: | //i added this line because i notices the wizard generates no code for the i/o selection
SET_TRIS_C(0x00); |
If you are using standard i/o mode (the default mode of the compiler)
and not fast_io mode, then you don't need to set the TRIS. The compiler
sets the TRIS by itself. Also, the flex_lcd.c driver requires Standard i/o
mode. You should not attempt to set the TRIS for this driver.
Also, you didn't post a complete test program. Are you using the
hardware UART pins in a #use rs232() statement ? These are pins
C4 and C5. You can't use them for both a serial port and for the LCD.
Comment out the #use rs232() statement or change it to use other
pins that are not on Port C. |
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GOBER
Guest
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| Posted: Mon Jan 04, 2010 12:35 am |
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Hello and thanks for reply.
First, I did comment the r/w line in the flex lcd driver.
| Code: | | //#define USE_RW_PIN 1 |
and I already connected the r/w pin to ground.
Second, even if the inserted code is unnecessary, it should not affect my program.
Third, I already started the code without setting the tris cause I know it will be set by the compiler in the default standard io mode, but I inserted it then just for being suspicious that the compiler might have some bug here.
Fourth, I'm not using the rs232, which is turned off by default.
Now, here is my complete test program:
| Code: |
#include "C:\Users\Alaa\Desktop\Flex LCD162 Test 16F688\Flex LCD162 16F688.h"
#include "C:\Users\Alaa\Desktop\Flex LCD162 Test 16F688\FLEXLCD162.C"
void main()
{
//these are generated using the wizard
setup_adc_ports(NO_ANALOGS|VSS_VDD);
setup_adc(ADC_OFF);
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
setup_timer_1(T1_DISABLED);
setup_comparator(NC_NC_NC_NC);
setup_vref(FALSE);
setup_oscillator(OSC_8MHZ);
//i added this line because i notices the wizard generates no code for the i/o selection
SET_TRIS_C(0x00);
lcd_init();
lcd_putc(" hello world ");
}
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and the pin map in the flex driver is:
| Code: | #define LCD_DB4 PIN_C0
#define LCD_DB5 PIN_C3
#define LCD_DB6 PIN_C4
#define LCD_DB7 PIN_C5
#define LCD_RS PIN_C2
#define LCD_E PIN_C1
//#define LCD_RW PIN_E2
// 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
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One more thing to mention, I'm using Proteus to test my program if it is working even though I have the board. I tried in Proteus to switch to the 16f690 (works for me even if I have to change the design) and tried a test program that you (PCM Programmer) posted somewhere and it also didn't work.
PS: I don't think there is a problem in the flex driver because I stayed up all night trying it on the pic16f877a randomly selecting the pin map for the lcd and I tried it 1000000000000000 of times and it was working excellent. I only had the problem in the 16f688 and 16f690, where I noticed the existence of a comparator and a USART multiplexed on the same pins I'm using for the LCD.
I hope I didn't forget anything. |
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GOBER
Guest
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| Posted: Thu Jan 07, 2010 4:06 am |
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PLS somebody post a reply i really need this
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FvM
Joined: 27 Aug 2008
Posts: 2337
Location: Germany
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| Posted: Thu Jan 07, 2010 7:48 am |
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The #use delay statement is missing in the example.
I see no reason, why the code shouldn't work with 16F688. I expect a hardware problem, e.g. wrong LCD connection.
Did you verify, if the processor is executing code at all, e.g setting the port to output, pulsing the LCD pins?
P.S.: Also show the #fuses. |
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GOBER
Guest
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| Posted: Fri Jan 08, 2010 12:27 am |
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The #use delay is contained in the header file included as it is generated by the project wizard. Also I'm using the Proteus virtual simulation to test my program and it is not showing anything. I'm sure that the processor is executing because I tested inputs and outputs separately and they are all fine. Someone told me to generate the header file that includes all the register names (tools->device selector->registers->make include files) and the program started to display only numbers on the lcd but no text (ex: if I send to the lcd the following: hello:12, then it will only display 12), so what the heck is going on.
PLS SOMEBODY WHO HAS SOME EXPERIENCE IN THE 16F688 IS THERE A BUG IN ITS REGISTER DEFINITION IN THE MAIN HEADER FILE> OR ELSE... |
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FvM
Joined: 27 Aug 2008
Posts: 2337
Location: Germany
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| Posted: Fri Jan 08, 2010 12:35 am |
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16F688 is generally O.K. with CCS C.
You don't show the fuses, so please check them yourself.
I can't say anything about Proteus, but you should be able to see, what is not working with 16F688. That's the purpose of a simulator, isn't it? |
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GOBER
Guest
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| Posted: Fri Jan 08, 2010 12:41 am |
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ok i will go with you that I'm making some mistake somewhere. I mean it's the last thing that i can come with after two weeks of trying.
Can you pls post me now a small hello world program using pic16f688 and I will be greatly thankful so that i will know what was i missing. |
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FvM
Joined: 27 Aug 2008
Posts: 2337
Location: Germany
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| Posted: Fri Jan 08, 2010 3:55 am |
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I'm not using LCD with 16F688, but here's a typical chip setup. The unused peripherals (ADC, timer,
comparator) are disabled by default, so they don't need to be considered in the setup.
| Code: | #include <16F688.h>
#fuses NOWDT,INTRC_IO,NOCPD,NOPROTECT,PUT,MCLR, NOBROWNOUT,NOIESO,NOFCMEN
#use delay(clock=8000000)
void main(void) {
setup_oscillator(OSC_8MHZ);
} |
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