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P51D
Joined: 25 Jan 2010
Posts: 36
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| Collecting different Pins to a new port-variable |
 Posted: Mon Feb 01, 2010 9:52 am |
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hello everyone
I have a question for software-design. I think in every mcu-system are not full ports used for peripherals.
I mean, I have PIN_G1, PIN_G3, PIN_G4, PIN_G5, PIN_D0, PIN_D7, PIN_F2 and I would have this to a port-name LCD which I can use for writing and reading like this:
| Code: |
bitset(Lcd_PORT,EN);
Lcd_PORT=((Lcd_PORT&0x0F)+(ctrl&0xF0));
delay_ms(1);
bitclr(Lcd_PORT,EN);
delay_ms(1);
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Is there any CCS-feature possibility to do this, or how could I do this ?
Thank you for helping.
Best regards
P51D |
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mbradley
Joined: 11 Jul 2009
Posts: 118
Location: California, USA
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| Posted: Mon Feb 01, 2010 12:59 pm |
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I have done this, to make a port with different pins
| Code: |
1
2 // this is a virtual port when we dont have a single 8bit output port
3
4 #define VPORT_0 PIN_A1
5 #define VPORT_1 PIN_A2
6 #define VPORT_2 PIN_A3
7 #define VPORT_3 PIN_A4
8 #define VPORT_4 PIN_B0
9 #define VPORT_5 PIN_B1
10 #define VPORT_6 PIN_B2
11 #define VPORT_7 PIN_B3
12
13
14 void virtPortWrite(int d)
15 {
16 output_bit(VPORT_0,bit_test(d,0));
17 output_bit(VPORT_1,bit_test(d,1));
18 output_bit(VPORT_2,bit_test(d,2));
19 output_bit(VPORT_3,bit_test(d,3));
20 output_bit(VPORT_4,bit_test(d,4));
21 output_bit(VPORT_5,bit_test(d,5));
22 output_bit(VPORT_6,bit_test(d,6));
23 output_bit(VPORT_7,bit_test(d,7));
24 }
25
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_________________
Michael Bradley
www.mculabs.com
Open Drivers and Projects |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon Feb 01, 2010 1:01 pm |
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| The easiest way is to use the Flex driver(s) in the Code Library forum. |
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P51D
Joined: 25 Jan 2010
Posts: 36
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| Posted: Mon Feb 01, 2010 2:35 pm |
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Sorry but which driver do you mean. I don't know the flex drivers.
once more, thank you for helping
best regards
P51D |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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P51D
Joined: 25 Jan 2010
Posts: 36
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| Posted: Tue Feb 02, 2010 7:22 am |
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There are the pins in a struct for creating a new virtual port.
I tested the driver for a 20x4 lcd and there are some problems:
If I set other ports to output the writing on the lcd are not at the maximum of brightness.
And when I write "This is the 1st line" I can only read "Tisisste1 ine".
all connections are correct and there is also a capacitance at the supply of the lcd.
Is this a software problem? |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Tue Feb 02, 2010 9:56 am |
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Are you using the 20x4 Flex driver ?
1. Post your (small) test program that calls the Flex driver functions.
It must be compilable with no errors.
2. Post the manufacturer and part number of your LCD.
3. Post the version number of your CCS compiler. |
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P51D
Joined: 25 Jan 2010
Posts: 36
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| Posted: Tue Feb 02, 2010 11:51 am |
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I use this driver
http://www.ccsinfo.com/forum/viewtopic.php?t=28268
| Code: |
set_tris_g(0xF000); // LCD Output
lcd_init(); // LCD initialisieren
delay_ms(5);
printf(lcd_putc, "\fABCDEFGHIJKLMNOPQRST");
delay_ms(3000);
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in the header I have changed this settings:
| Code: |
#define LCD_DB4 PIN_G6
#define LCD_DB5 PIN_G7
#define LCD_DB6 PIN_G8
#define LCD_DB7 PIN_G9
#define LCD_RS PIN_G0
#define LCD_RW PIN_G1
#define LCD_E PIN_G2
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and also all "delay_cycle" and "delay_us" I've changed in "delay_ms(1)" minimal. because the speed was to fast and then there were lost some datas.
yet I have the right information on the display but the writing ist still not bright. I think there is a problem with the control-pins RS, RW, E.
I don't know the exactli manufacturer and part number of the lcd but I know the lcd driver on it: HD44780 (I think this is a standart lcd)
the version number of the pcwhd compiler is 4.057
thank you for helping
best regards
P51D |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Tue Feb 02, 2010 1:19 pm |
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Post a compilable test program. It must have:
1. The #include line for the PIC's .h file.
2. The #fuses statement(s).
3. The #use delay() statement.
4. #define statements.
5. The #include line for the LCD driver file.
6. A main().
7. The code in main(). |
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P51D
Joined: 25 Jan 2010
Posts: 36
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| Posted: Tue Feb 02, 2010 2:50 pm |
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The main with the fuses
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//*****************************************************************************
// Externe Dateien einbinden
#include <30F6012A.h>
#include "lcd.h"
//*****************************************************************************
// Präprozessoren
#device *=16
#device adc=8
#FUSES NOWDT //No Watch Dog Timer
#FUSES HS //High speed Osc (> 4mhz)
#FUSES PR //Promiary Oscillator
#FUSES NOCKSFSM //Clock Switching is disabled, fail Safe clock monitor is disabled
#FUSES WPSB1 //Watch Dog Timer PreScalar B 1:1
#FUSES WPSA1 //Watch Dog Timer PreScalar A 1:1
#FUSES PUT64 //Power On Reset Timer value 64ms
#FUSES BROWNOUT //Reset when brownout detected
#FUSES BORV20 //Brownout reset at 2.0V
#FUSES LPOL_HIGH //Low-Side Transistors Polarity is Active-High (PWM 0,2,4 and 6)
//PWM module low side output pins have active high output polar
#FUSES HPOL_HIGH //High-Side Transistors Polarity is Active-High (PWM 1,3,5 and 7)
//PWM module high side output pins have active high output polarity
#FUSES NOPWMPIN //PWM outputs drive active state upon Reset
#FUSES MCLR //Master Clear pin enabled
#FUSES NOPROTECT //Code not protected from reading
#FUSES NOWRT //Program memory not write protected
#FUSES NODEBUG //No Debug mode for ICD
#FUSES NOCOE //Device will reset into operational mode
#FUSES ICS0 //ICD communication channel 0
#FUSES RESERVED //Used to set the reserved FUSE bits
#FUSES RESERVED //Used to set the reserved FUSE bits
#use delay(clock=20000000)
//*****************************************************************************
// Funktionen
void SysInit(void){
set_tris_g(0xF000); // LCD Output
lcd_init(); // LCD initialisieren
printf(lcd_putc, "\fABCDEFGHIJKLMNOPQRST");
delay_ms(3000);
}
//*****************************************************************************
// Hauptfunktion
void main(){
SysInit();
// Test the clear screen and newline commands.
// Also test that we can write to all 4 lines.
printf(lcd_putc, "\fThis is the 1st line");
printf(lcd_putc, "\nNext is the 2nd line");
printf(lcd_putc, "\nThis is the 3rd line");
printf(lcd_putc, "\nFinally the 4th line");
delay_ms(3000);
for(;;){
}
}
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and the defines in the lcd.h (I didn't insert the whole driver code)
| Code: |
// These pins are for my Microchip PicDem2-Plus board,
// which I used to test this driver.
// An external 20x4 LCD is connected to these pins.
// Change these pins to match your own board's connections.
#define LCD_DB4 PIN_G6
#define LCD_DB5 PIN_G7
#define LCD_DB6 PIN_G8
#define LCD_DB7 PIN_G9
#define LCD_RS PIN_G0
#define LCD_RW PIN_G1
#define LCD_E PIN_G2
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Sorry, but I thought that you didn't want all parts. My mistake.
best regards
P51D |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Tue Feb 02, 2010 2:53 pm |
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| Quote: |
#include <30F6012A.h>
#include "lcd.h"
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The 20x4 Flex LCD driver was only tested with the PCM and PCH compilers.
I don't have the PCD compiler, so I can't test your code. |
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P51D
Joined: 25 Jan 2010
Posts: 36
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| Posted: Wed Feb 03, 2010 1:32 am |
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ok,
I think there is a problem with a control pin, because on a reset the writing is bright, then the lcd is updating and the brightness of the writing is not enough.
I will look this with an oszi and then I will check the delay-times.
you will hear from me.
best regards
P51D |
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P51D
Joined: 25 Jan 2010
Posts: 36
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| Posted: Thu Feb 04, 2010 6:58 am |
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hi
I've checked the pins. the problem was the speed:
| Code: |
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_us(15);
output_high(LCD_E);
delay_us(15);
output_low(LCD_E);
}
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the cycle-delay and the delay_us(2) are both changed to delay_us(15)
then the hd44780 lcd driver.
best regards
P51D |
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