Prefekt

December 3, 2006

Hi,

my code for adc with the PIC 12F675 works fine with C2C. But now I have the SourceBoost and the compiler tells me, that are any errors in my code. But I cant find any errors...

Here is the part with the ADC

/*- Variablen ------------------------------------------------------------- */

char ADCon0@0x1F;

char ADCon1@0x9F;

char ADResH@0x1E;

char ADResL@0x9E;

short sResult; // 16Bit ADResH & ADResL

/*- Config ---------------------------------------------------------------- */

//option_reg;

trisio=001001b;

//cmcon=7;

/*- Am Anfang den Port ausschalten und 2 sec warten ------------------------*/

gpio=000000b;

delay_s(2);

/*- Configure ADC module ---------------------------------------------------*/

set_bit(STATUS, 'RP0');

ADCon1 = 00000100b;

clear_bit(STATUS, 'PRO');

ADCon0 = 10000001b;

/*- Lüfter erst mal volle Drehzahl -*/

gpio=000010b;

delay_s(4);

/*- Programmschleife ------------------------------------------------------ */

while(1)

{

int i=0;

int iDelay=16;

int iDelta=CMaxTemp-CMinTemp;

/*- Meßvorgang -*/

clear_bit (ADCon0,3); // Select RA0

set_bit (ADCon0,1); // Start AD-Conversion

while ((ADCon0 & 2) == 2)

{

nop();

}

sResult = ADResH;

sResult <<= 8;

sResult |= ADResL;

Has anybody an sample for ADC conversation with PIC 12F675 and SourceBoost?

Thanks

Volker

October 11, 2006

Hi,

I use the PIC12F675 or PIC 12F629 for this. Do you have an sample code with the timer?

regards,

Volker

October 10, 2006

Hi,

I want to meassuring the high pulse of an frequency. The high puls could be between 0,5 and 2ms and I need the excacly worth of the high pulse time. Has anybody an Idea how to meassure frequency and/or the hight pulse time?

thanks

Volker

December 16, 2004

Hello,

here is my code to work with the eeprom.

#include <system.h>

//the memory bank 0 should be selected

void write_flash( char addr, char data )

{

//Write flash

eeadr = addr;

eedata = data;

set_bit( status, RP0 );

set_bit( eecon1, WREN );

eecon2 = 0x55;

eecon2 = 0xAA;

set_bit( eecon1, WR );

while(eecon1&2);

clear_bit( eecon1, WREN );

clear_bit( status, RP0 );

}

char read_flash( char addr )

{

//Read flash

eeadr = addr;

set_bit( eecon1, RD );

asm movf _eedata, W

}

With a little test prg it works fine. But if I call the write functions from my Project, the values are not stored in the eeprom. If I debug my project, somtimes the values for paramter of the function was not overgiven!

Do you known the problem.

Ragards

December 1, 2004

Hello,

I'm stored values in the internal EEPROM from a 16F876. After a reset are the values sometime corrupted oder the values are not the same. Somtimes after a reset, the values are ok?

Can anybody explain me why and how I can store my values right in the internal EEPROM?

Thanks

Volker

November 16, 2004

Hello,

I'm thinking also, that is as memory problem.

Sample Variable definition:

it work's:

char a;

char b;

char c;

or

int i;

or

int i;

char a;

it dosen't works:

char a:

char b:

char c:

char d;

or

int i;

int j;

or

int i;

char a;

char b;

Here is a sample Code, that work. If you delete the comment and use the two integer variable it doesen't work....

#include <system.h>

void erase_eeprom();

void write_eeprom(char adresa,char data);

char read_eeprom(char adresa);

void main(void)

{

char c=0x00;

char d=0x00;

char a=0x00;

char e=0x00;

char b=0x00;

char f=0x00;

char g=0x00;

char j=0x00;

/*int i;

int k;*/

trisb=00000000b;

portb=00000000b;

d=read_eeprom(0x0000);

write_eeprom(0x0001,10101010b);

d=read_eeprom(0x0001);

if(d==00001111b){

c=11110000b;

portb=11110000b;}

else{

c=00001111b;

portb=00001111b;}

write_eeprom(0x0000,c);

while(1);

}

void write_eeprom(char adresa,char data)

{

char addr = adresa;

char dat = data;

asm{

BSF STATUS, RP1 ;

BSF STATUS, RP0 ;Bank 3

BTFSC EECON1, WR ;Wait for

GOTO $-1 ;write to finish

BCF STATUS, RP0 ;Bank 2

MOVF _addr_write_eeprom , W ;Address to

MOVWF EEADR ;write to

MOVF _dat_write_eeprom, W ;Data to

MOVWF EEDATA ;write

BSF STATUS, RP0 ;Bank 3

BCF EECON1, EEPGD ;Point to Data memory

BSF EECON1, WREN ;Enable writes

;Only disable interrupts

BCF INTCON, GIE ;if already enabled,

;otherwise discard

MOVLW 0x55 ;Write 55h to

MOVWF EECON2 ;EECON2

MOVLW 0xAA ;Write AAh to

MOVWF EECON2 ;EECON2

BSF EECON1, WR ;Start write operation

;Only enable interrupts

BSF INTCON, GIE ;if using interrupts,

;otherwise discard

BCF EECON1, WREN ;Disable writes

}

return;

}

char read_eeprom(char adresa)

{

char addr = adresa;

asm{

BSF STATUS, RP1 ;

BCF STATUS, RP0 ;Bank 2

MOVF _addr_read_eeprom, W ;Write address

MOVWF EEADR ;to read from

BSF STATUS, RP0 ;Bank 3

BCF EECON1, EEPGD ;Point to Data memory

BSF EECON1, RD ;Start read operation

BCF STATUS, RP0 ;Bank 2

MOVF EEDATA, W ;W = EEDATA

}

return EEDATA;

}

void erase_eeprom()

{

EEADR=0;

while(EEADR<=63){

EEDATA=0;

write_eeprom(EEADR,EEDATA);

}

@asmallri

I will test to disable the interrupts.

November 15, 2004

Hello,

I'm using a 16F876 and the internal eeprom. The write and read at the eeprom works fine. But if I'm using more than three variables like this:

char cDigit1=0x00;

char cDigit2=0x00;

char cDigit3=0x00;

the value was not written in the eeprom?

If I wrote this in my code:

char cDigit1=0x00;

char cDigit2=0x00;

char cDigit3=0x00;

//char cDigit3=0x00;

it works?

my eeprom code is:

void write_eeprom(char adresa,char data)

{

char addr = adresa;

char dat = data;

asm{

BSF STATUS, RP1 ;

BSF STATUS, RP0 ;Bank 3

BTFSC EECON1, WR ;Wait for

GOTO $-1 ;write to finish

BCF STATUS, RP0 ;Bank 2

MOVF _addr_write_eeprom , W ;Address to

MOVWF EEADR ;write to

MOVF _dat_write_eeprom, W ;Data to

MOVWF EEDATA ;write

BSF STATUS, RP0 ;Bank 3

BCF EECON1, EEPGD ;Point to Data memory

BSF EECON1, WREN ;Enable writes

;Only disable interrupts

BCF INTCON, GIE ;if already enabled,

;otherwise discard

MOVLW 0x55 ;Write 55h to

MOVWF EECON2 ;EECON2

MOVLW 0xAA ;Write AAh to

MOVWF EECON2 ;EECON2

BSF EECON1, WR ;Start write operation

;Only enable interrupts

BSF INTCON, GIE ;if using interrupts,

;otherwise discard

BCF EECON1, WREN ;Disable writes

}

return;

}

Is this a bug in the compiler?

Thanks

Volker

November 26, 2003

Hello,

where can I found an simulator for the pic?

Thanks

Prefekt

November 26, 2003

@Joan:

Thank's, this was very helpful...

@All

Has anybody code for a serial connection? The examples on the example page dosn't work!

Thanks

Prefekt

November 17, 2003

Hello,

I've a Transponder Board that implements a RS232 Interface. This Borad I can connect with my PC and I developed a software the can comunicate with the board.

Now i would like to get the information from the board with a pic. Need I a serial interface IC?

Has anybody a shematic and the C2C Code for a example application?

thanks

regards

Prefekt

September 28, 2003

Has anybody implementet an DCF77 receiver with a pic?

cu

Prefekt

June 14, 2003

Hello,

I've problems with the A/D conversation. When I'am using only AN0/RA0 it works fine. But, when I'm using AN0 and AN1, the value on AN1 is correct, if AN0 has no input. If AN0 and AN1 have Input, the messuring on AN0 is ok, but the messuring on AN1 is incorrect.

And anoterh probelem is that i configure

trisa = 00000001b;

if I write

trisa = 00000011b; the A/D converter is not running

but I'm using AN0 and AN1 why?

here's the configuration:

trisa = 00000001b;

ADCon1 = 10000100b;

ADCon0 = 01000001b;

That's the code to messure AN0:

void MessureAkkuVoltage()

{

/*- Meßvorgang -*/

ADCon0 = 01000001b; /*- Select RA0 -*/

set_bit (ADCon0,2); /*- Start AD-Conversion -*/

while ((ADCon0 & 4) == 4)

{

nop();

}

/*- Wert in einer 16Bit Variable zusammenfassen -*/

iVmess = ADResH;

iVmess <<= 8;

iVmess |= ADResL;

iVmess = iVmess * 2;

return;

}

and messuring AN1:

void MessureChargeCurrent()

{

/*- Meßvorgang -*/

ADCon0 = 01001001b; /*- Select RA1 -*/

set_bit (ADCon0,2); /*- Start AD-Conversion -*/

while ((ADCon0 & 4) == 4)

{

nop();

}

/*- Wert in einer 16Bit Variable zusammenfassen -*/

iAmess = ADResH;

iAmess <<= 8;

iAmess |= ADResL;

return;

}

Has anybody an idea?

Thanks Prefekt

May 4, 2003

Hello,

I've a simple question about the porta. I've making six LED's on the porta of a PIC16F876. The code is the follow:

trisa=00000000b;

porta=00111111b;

On the output, the LED 1,2,3,4,6 are on, but the LED 5 (RA4) is off, why?

Regards Prefekt

April 30, 2003

Hello,

the sampel DS1302 RTC dosen't work, why. I've mailing the author Don Cramer, but no answer is comming...

The only change I made is:

rst_pin = 0 on porta

clk_pin = 1 on porta

data_pin = 2 on porta

an i have the output from the rtc display on LED's.

Has anybody use the code or have a nother code for the ds1302?

thanks

February 22, 2003

Hello,

I programming a LCD Interface an a ADC Input. Now I would display the voltage from ADC to my LCD Display!. But I have two values, one in the low byte another in the high byte. How I can convert the binary value to a decimal value?

Also I think, I must compute: U = Uinput * 5 / 1,024, because the pic can messure 5V with 10Bit (1024), so the PIC can messure 2,8828 mV Steps 5V/1024, right?

Has anybody implimented a voltage messure and display on a LCD?

Thanks

Volker

February 15, 2003

Hello,

I want to get Analog input information. Has anybody implemented a Analog Inpuf for the e.g. PIC16F876?

Thanks

Prefekt

February 15, 2003

Hello,

I mean I am getting the wrong duty cycle!

Do you have any idea? Is a PIC 16F876 with 4Mhz ok, or should I get a PIC with 20Mhz?

Prefekt

February 9, 2003

Hello,

I need a PWM Output on 10 Pins.

Do anybody write a PWM output on variouse pin's?

I wrote the folling code:

while (j <= 4)

{

while ( i <= 255)

{

set_bit(portb, 1);

delay_us(200);

clear_bit(port. 1);

delay_us(55);

i=i+1;

}

i=0;

j=j+2;

}

This code shoud genertae a output frequenze, with e.g. 1Khz with a output for 72,5%on an 27,5%off.

But the output is not so, why?

thanks

Prefekt

February 4, 2003

Thank,

it's so simple, but i had no idea...

Regards

Prefekt

February 3, 2003

Hello,

I'm new in programming PIC with c.

In one of my first project, I want get information if a spezifield bit is set on input porta e.g. bit 2.

The function input_pin_port_a() is obsolet? Is ther a new function? Ther is the function set_bit().

May problem is, I have definition trisa = 00001100b; Then i want call a function if porta is xxxx01xxb and xxxx10xxb (x is 0 or 1) How I can do that without to write:

if (porta == 00000100b or porta == 00000111b ...) ?

thanks

Prefekt

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Adc With Pic 12f675

Frequency Meassuring

Frequency Meassuring

Eeprom Problmes

Eeprom Problmes

Bug With Eeprom?

Bug With Eeprom?

Simulator

RS232 Circuit

RS232 Circuit

DCF77

Probelm with A/D

PortA question

Sample DS1302 RTC

ADC an Display

Analog Input

PWM Signal

PWM Signal

Get Input Information?

Get Input Information?

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