Request PICMICRO codes here (C Only)

[zer0w1ng]

Basing from above's code, assigning percentage as parameters:

Code: [Select]

void setPWMDuty(unsigned char percent)
{
    unsigned int duty;
   
    duty = (percent * maxDuty)/100;

    CCPR1L = duty >> 2;                  // Set MSB values
    CCP1CON = ((duty & 3) << 4) | 0x0C;  // set initial duty and set PWM mode bits.
}


[SpongeBob]

master zerowing, ano gamit mong compiler?

[zer0w1ng]

For PICs: Hitech, Microchip MPLAB C18 and MPLAB C30.
ARM: ARM Realview, GCC-raisonance and GCC-winarm
8051:SDCC
CSR Bluetooth chips: Bluelab (GCC based).

[SpongeBob]

bigatin pala compiler mo master zerowing,

eto pala contribution ko sa thread, galing sa LCD scrolling message

ibaibang coding style ibaibang compiler basically ganito lang magpascroll sa LCD

Code: [Select]

char msg[50]="                PICkit2 Electronicslab.ph", a, b, num_chars; //meron leading spaces para pag on blanko muna

void scroll(void){
for(a = 0;a < num_chars;a++){//num_chars galing sa strlen()
set_address(0x00);                //sa unang linya ng LCD
for(b = 0;b < 16;b++)            //kung ilan chars ng LCD, dito 16
lcd_char(msg[b + c])             //show chars
delay_ms(300);                    //scroll speed
}
}

[marcelino]

bigatin pala compiler mo master zerowing,

eto pala contribution ko sa thread, galing sa LCD scrolling message

ibaibang coding style ibaibang compiler basically ganito lang magpascroll sa LCD

Code: [Select]

char msg[50]="                PICkit2 Electronicslab.ph", a, b, num_chars; //meron leading spaces para pag on blanko muna

void scroll(void){
for(a = 0;a < num_chars;a++){//num_chars galing sa strlen()
set_address(0x00);                //sa unang linya ng LCD
for(b = 0;b < 16;b++)            //kung ilan chars ng LCD, dito 16
lcd_char(msg[b + c])             //show chars
delay_ms(300);                    //scroll speed
}
}

di ko masundan sir Rob... di ko masundana ang linyang ito:
lcd_char(msg[b + c])             //show chars
marahil msg[a+b]

[marcelino]

di ko masundan sir Rob... di ko masundana ang linyang ito:
lcd_char(msg[b + c])             //show chars
marahil msg[a+b]

tama po... a+b nga...

any way thank you for this... i'll add this to my project. it will serve as a background or sort of a screen saver when my system is idle... anyway i did not implement sleep mode. heheh
so during standby mode, magdisplay na ng similar nito.

[SpongeBob]

tama ka sir marce a+b nga, may semicolon pa after that line
kung gusto ng mas mahabang message like hundreds of characters PIC18F series ang gamitin, yun PIC16F series kasi nagrereklamo yung compiler kung lagpas na sa page ang array, meron kasi banking ang 16F

[jonardDAKILA]

la po bang seven segment codes

[paranz]

^ check my PIC tutorial thread

[clarkent]

nalilito pa po ako sa pagamit ng comparator ng f628a. sino na po nakagamit nito? papost naman po ng sample code using hitech c. TIA

['yus]

pa-request naman ng routines for software SPI..
like "spi_write(address, byte);" and "spi_read(address);"

[zer0w1ng]

pa-request naman ng routines for software SPI..
like "spi_write(address, byte);" and "spi_read(address);"

Reading and writing to SPI port happens at the same time.
So the routine could just be "unsigned char spi_write(unsigned char data)" returning the value read after write.
A pure read could just be:
(void) spi_write(address);
value = spi_write(0x00);

A write will be:
(void) spi_write(address);
(void) spi_write(data1);
(void) spi_write(data2);

I have not made any software SPI for it will be very slow.  And for slow apps, I just use I2C instead of SPI.
SPI also has many constraints on timing depending on the slave device.  These are the inactive clock either low or high,
MSB or LSB first, and the polarity of the clock when data is shifted either low-to-high or high-to-low.

Anyway, here is one but may not be what you need but can base on it(untested):

Code: [Select]

unsigned char spi_write(unsigned char data)
{
    unsigned char v, i;

    v = 0;
    i = 8;
    CLK = 1;
   
    do {
   
        if (data & 0b10000000)
        {
            MOSI = 1;
        }
        else
        {
            MOSI = 0;
        }
       
        bit_delay();
       
        CLK = 0;
       
        v <<= 1;
        if (MISO = 1)
            v |= 1;
           
        data <<= 1;
       
        CLK = 1;
   
    } while (--i);
   
    return v;
}


['yus]

thanks, sir zer0!

una kong napansin:
pwede pala yung function na nagre-return na value ay lagyan lang ng (void) sa unahan..

gusto ko sana yan i-apply sa memory card interfacing (SD card in SPI mode).
compatible ba yan sa physical layer ng memory card interfacing?

[zer0w1ng]

thanks, sir zer0!
gusto ko sana yan i-apply sa memory card interfacing (SD card in SPI mode).
compatible ba yan sa physical layer ng memory card interfacing?

You're welcome.
Pwede sa memory card.  Just take care of the large buffers needed to read and write.

[coolSkool]

Kung sino po ang may alam kung paano yung codes para e display ang "Hello World" using LCD ng alexan interfacing to pic16f877. Using Hitech C or any equivalent C language.
Thank you.

[zer0w1ng]

Please search the forum. There are many LCD routines posted earlier here.

[paranz]

ang gusto ko po sanang matutunan using hi tech c ay ang pag gamit ng comparator ng PIC.

here is a sample code for comparator using PIC16F88. There are 8 possible comparator modes; this sample program uses mode 6 (Two common reference comparator with output). Refer to datasheet for more details on comparator operation.


main.c

Code: [Select]


#include <pic.h>
#include "pic16f_comparator.h"


__CONFIG(HS & MCLRDIS & WDTDIS & PWRTDIS & UNPROTECT & LVPDIS);

void main()
{
TRISA &= ~0x18;
init_comparator();

while(1)
{
//does nothing
}
}



pic16f_comparator.h

Code: [Select]


//macro
#define COMP_2IN_COM_REF_OUT 0x06

//function prototype
void init_comparator(void);




pic16f_comparator.c

Code: [Select]


#include <pic.h>
#include "pic16f_comparator.h"


void init_comparator(void)
{
C2INV = 0; //comparator 2 output not inverted
C1INV = 0; //comparator 1 output not inverted
CMCON &= ~0x07; //clear CM2:CM0 bits
CMCON |= COMP_2IN_COM_REF_OUT; //mode: Two common reference
//comparator with output

return;
}




to test the above code, connect 3 potentiometers to RA0, RA1, and RA2 and 2 LEDs to RA4 and RA3.

During program execution, if analog voltage at RA1 is lesser than analog voltage at RA2, RA4 will be logic 1 (LED1 on).

If analog voltage at RA0 is lesser than analog voltage at RA2, RA3 will be logic 1 (LED2 on).

[clarkent]

here is a sample code for comparator using PIC16F88. There are 8 possible comparator modes; this sample program uses mode 6 (Two common reference comparator with output). Refer to datasheet for more details on comparator operation.


main.c

Code: [Select]


#include <pic.h>
#include "pic16f_comparator.h"


__CONFIG(HS & MCLRDIS & WDTDIS & PWRTDIS & UNPROTECT & LVPDIS);

void main()
{
TRISA &= ~0x18;
init_comparator();

while(1)
{
//does nothing
}
}



pic16f_comparator.h

Code: [Select]


//macro
#define COMP_2IN_COM_REF_OUT 0x06

//function prototype
void init_comparator(void);




pic16f_comparator.c

Code: [Select]


#include <pic.h>
#include "pic16f_comparator.h"


void init_comparator(void)
{
C2INV = 0; //comparator 2 output not inverted
C1INV = 0; //comparator 1 output not inverted
CMCON &= ~0x07; //clear CM2:CM0 bits
CMCON |= COMP_2IN_COM_REF_OUT; //mode: Two common reference
//comparator with output

return;
}




to test the above code, connect 3 potentiometers to RA0, RA1, and RA2 and 2 LEDs to RA4 and RA3.

During program execution, if analog voltage at RA1 is lesser than analog voltage at RA2, RA4 will be logic 1 (LED1 on).

If analog voltage at RA0 is lesser than analog voltage at RA2, RA3 will be logic 1 (LED2 on).

palpak yung mga trials ko nito.hehe try ko tong code mo sir.hehe

[marcelino]

Dear folks, since many members are requesting for PIC codes, let this thread be our main repository for C codes written for any C compiler (hitech, ccs c, mikroc, sdcc, c18.. ).

Let me start


Here is a simple program. You can  simulate using Pr*teus 

Code: [Select]


//output a 10khz squarewave, 25% duty cycle signal at RC2/CCP1 pin
//PIC16F877 with 4 mhz clock


#include <pic.h>

__CONFIG(HS & WDTDIS & PWRTDIS & UNPROTECT);


void init_PWM(void)
{
//clear TMR2 relevant registers
CCP1CON = 0x00;
TMR2 = 0x00; //clear TMR2 register
TMR2ON = 0; //TMR2 is off

//configure TMR2 in PWM mode
CCP1CON = 0x0C; //PWM mode
T2CON &= ~0x03; //set prescaler, 1:1
PR2 = 0x60; //set period/frequency, ~10khz
CCPR1L = 0x18; //set duty cycle, ~40khz
CCP1CON &= ~0x30 ;

//PWM output pin
TRISC2 = 0;

//disable interrupts
PEIE = 0;
GIE = 0;

//enable TMR2
T2CON = 1; //PWM signal is generated.
//You can view the square wave signal
//using an oscilloscope, probe connected to
//RC2 pin
}

void main()
{
init_PWM();

while(1);
}





Can I ask for calculations for and explanations for this code?

//configure TMR2 in PWM mode
   CCP1CON = 0x0C;         //PWM mode -----------------> I get this. 0b00001100
   T2CON &= ~0x03;         //set prescaler, 1:1-------> ano nga an ibig sabihin nito?
   PR2 = 0x60;         //set period/frequency, ~10khz---------> papano naging approximately 10k?
   CCPR1L = 0x18;         //set duty cycle, ~40khz---------------> bakit ang duty cycle which is  in percentage, presented in Hz
   CCP1CON &= ~0x30 ; --------------------------------------------> once again, ano nga ang ibig sabihin nito?

[horde_fuego]

pwede rin po ba mag-request ng simple interrupt routine using timer 0 module ng PIC16F628A gamit na compiler ay CCS C?gusto ko na kasi matuto ng interrupts using timers kaso nakakatakot ang mga interrupts gamitin para saakin 
kung pwede po simple application ay up counter hanggang 999.
salamat po ng marami!!!