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mehmetem
Joined: 29 Jul 2011
Posts: 12
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| pic16f877a i2c slave problem |
 Posted: Fri Jul 29, 2011 8:25 am |
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Hi All,
I have a problem; I could not simulate ex_slave example.
My master code:
| Code: |
#include <16F877A.h>
#device adc=8
#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 PROTECT //Code protected from reads
#FUSES NODEBUG //No Debug mode for ICD
#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
#use delay(clock=20000000)
#use i2c(Master,Slow,sda=PIN_C4,scl=PIN_C3,force_hw)#include <2402.C>
byte gelen=0;
void main()
{
setup_adc_ports(NO_ANALOGS);
setup_adc(ADC_OFF);
setup_psp(PSP_DISABLED);
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
setup_comparator(NC_NC_NC_NC);
setup_vref(FALSE);
init_ext_eeprom();
// TODO: USER CODE!!
gelen= read_ext_eeprom(0x03);
while(1);
}
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My slave code is
| Code: |
#if defined(__PCM__)
#include <16F877.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)
#elif defined(__PCH__)
#include <18F452.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)
#endif
#use i2c(SLAVE, SDA=PIN_C4, SCL=PIN_C3, address=0xa0)
BYTE address, buffer[0x10];
#INT_SSP
void ssp_interupt ()
{
BYTE incoming, state;
state = i2c_isr_state();
if(state <= 0x80) //Master is sending data
{
incoming = i2c_read();
if(state == 1) //First received byte is address
address = incoming;
if(state == 2) //Second received byte is data
buffer[address] = incoming;
}
if(state == 0x80) //Master is requesting data
{
i2c_write(buffer[address]);
}
}
void main ()
{
int i=0;
enable_interrupts(GLOBAL);
enable_interrupts(INT_SSP);
for (i=0;i<16;i++)
{buffer[i]=0x37;}
while (TRUE) {}
}
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and my problem: Received data all times 80. Where is my mistake? I could not find. Here is a Proteus picture:
I am sorry for my broken English.
_________________
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temtronic
Joined: 01 Jul 2010
Posts: 9163
Location: Greensville,Ontario
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| Posted: Fri Jul 29, 2011 8:51 am |
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Probably a Proteus problem as it is full of bugs, errors, glitches etc.
You should use real hardware.
If you can't contact a Proteus help forum or the mfr of the simulator.
There are working code examples in the CCS examples folder you might consult, see if they work under Proteus. |
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mehmetem
Joined: 29 Jul 2011
Posts: 12
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| Thank you, I solved problem. |
| Posted: Wed Aug 03, 2011 12:57 am |
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_________________
trainee |
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PEDE
Joined: 10 Sep 2011
Posts: 1
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| pic16f877a i2c slave problem |
| Posted: Sat Sep 10, 2011 10:29 am |
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| How did you fix your problem? Thx... |
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mehmetem
Joined: 29 Jul 2011
Posts: 12
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| There is not anything, Don't forget pull-up' MY WORKING CODE |
| Posted: Sat Sep 10, 2011 2:12 pm |
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| Code: |
BYTE address, BufferTxt[20], buffer[20];
#INT_SSP
void ssp_interupt ()
{
BYTE incoming, state;
state = i2c_isr_state();
if(state <= 0x80) //Master is sending data
{
incoming = i2c_read();
if(state == 1) //First received byte is address
address = incoming;
if(state == 2) //Second received byte is data
buffer[address] = incoming;
}
if(state == 0x80) //Master is requesting data
{
i2c_write(buffer[address]);
}
} |
AND MASTER
| Code: | while(1)
{
init_ext_eeprom();
PresetNumber= read_ext_eeprom(0x09);
if (PresetNumber!=PresetNumberOld)
{
CalcPhase();
yerptr=&(Rpm);
countL=*(yerPtr);
write_ext_eeprom(0x07,CountL);
countH=*(yerPtr+1);
write_ext_eeprom(0x08,CountH);
delay_ms(40);
} |
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