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40inD
Joined: 30 Jul 2007
Posts: 112
Location: Moscow, Russia
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| Can't get I2C in 18F452 working! |
 Posted: Mon Aug 06, 2007 12:53 am |
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I can't recieve anything from I2C bus. I have 24LC64 and DS1307 on the bus. Pull-up resistors are 4.7K (tried 1k to 10k). I Can't read or write to EEPROM and can't read DS1307. I've tryed software and hardware I2C, slow and fast...
Here is my code:
| Code: | ////////////////////////
#include <18F452.h>
#device adc=16
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=20000000)
#use i2c(Master, sda=PIN_C4,scl=PIN_C3,force_sw)
char k;
int16 raw_lighting;
int tempb, l_duration, cur_min1, cur_min2, start_hour, start_min;
int lmode; //0 - авто(ночью горит),
//1 - заданная продолжителность дня отн. рассвета
//2 - ручной режим (время вкл-выкл)
boolean setted, heatstate;
float lighting, templighting, temperature, tmin, tmax, tmode, delta;
BYTE sec;
BYTE min, min_on, min_off;
BYTE hrs, hrs_on, hrs_off;
BYTE day;
BYTE month;
BYTE yr;
BYTE dow;
#define DQ1 PIN_C0
#define EEPROM_SDA PIN_C4
#define EEPROM_SCL PIN_C3
#define ADR_FIRST_RUN 0
#define ADR_TMODE 3
#define ADR_LMODE 5
#define ADR_LDURATION 6 // продолжительность дня отн. рассвета
#define ADR_LON 7 //время включения света
#define ADR_LOFF 9 //время выключения света
#define ADR_TMAX_MONTH 10
#define ADR_TMAX_DAY 11
#define ADR_TMAX_HRS 12
#define ADR_TMAX_MIN 13
#define ADR_TMIN_MONTH 14
#define ADR_TMIN_DAY 15
#define ADR_TMIN_HRS 16
#define ADR_TMIN_MIN 17
#define ADR_TMAX 20
#define ADR_TMIN 24
#include <math.h>
#include <stdlib.h>
#include <24AA64.c>
#include <mylcd.c>
#include <mykbd.c>
#include <ds1822single.c>
#include <ds1307.c>
#include <menus.c>
#include <stdlib.h>
////-------- functions cutted--------
#int_RB
void RB_isr(void) {
k=kbd_getc();
beep();}
void main() {
int tempdelay;
//============ init =================
lcd_init();
lcd_putc("\fLCD init OK\n");
kbd_init();
init_ext_eeprom();
ds1307_init();
setup_adc_ports(AN0);
setup_adc(ADC_CLOCK_DIV_8);
set_adc_channel(0);
tmax=20;
tmin=0;
tmode=25;
lmode=0;
heatstate = FALSE;
delta=0.5;
hrs_on=20;
hrs_off=22;
min_on=0;
min_off=20;
onewire_reset();
onewire_write(0xCC);
onewire_write(0x44);
lcd_putc("1820 init OK\n");
ENABLE_INTERRUPTS(INT_rb);
enable_interrupts ( GLOBAL );
printf(lcd_putc,"\fread rom 1 \n");
if ((read_rom(0)==0)||(read_rom(0)==0xFF)) // <== program hangs here when reading eeprom
menu();
else
{printf(lcd_putc,"read rom 2 ");
tmode=read_rom(ADR_TMODE);
lmode=read_rom(ADR_LMODE);
heatstate = FALSE;
delta=0.5;
hrs_on=read_rom(ADR_LON);
hrs_off=read_rom(ADR_LOFF);
min_on=read_rom(ADR_LON+1);
min_off=read_rom(ADR_LOFF+1);
l_duration=read_rom(ADR_LDURATION);
}
k=0;
ds1820_read();
while (TRUE) {
....
}
} |
and hese is the 24lc64 driver:
| Code: |
#define EEPROM_ADDRESS long int
#define EEPROM_SIZE 8192
BOOLEAN ext_eeprom_ready() {
int1 ack;
i2c_start(); // If the write command is acknowledged,
ack = i2c_write(0xa0); // then the device is ready.
i2c_stop();
delay_ms(5);
return !ack;
}
void init_ext_eeprom()
{
output_FLOAT(EEPROM_SCL);
output_FLOAT(EEPROM_SDA);
}
void write_rom(int16 address, int8 data) {
short int status;
output_high(pin_e2);
while(!ext_eeprom_ready());
i2c_start();
i2c_write(0xa0);
i2c_write(address >> 8);
i2c_write(address);
i2c_write(data);
i2c_stop();
delay_ms(5) ;
status=i2c_write(0xa0);
while(status==1)
{
i2c_start();
status=i2c_write(0xa0);
i2c_stop();
delay_ms(5);
}
output_low(pin_e2);
}
BYTE read_rom(long int address) {
BYTE data;
output_high(pin_e2);
while(!ext_eeprom_ready());
i2c_start();
i2c_write(0xa0);
i2c_write(address >> 8);
i2c_write(address);
i2c_start();
i2c_write(0xa1);
data=i2c_read(0);
i2c_stop();
output_low(pin_e2);
return(data);
}
void WRITE_FLOAT(long int n, float data) {
int f;
for (f = 0; f < 4; f++)
write_rom(f + n, *(&data + f) ) ;
}
float READ_FLOAT(long int n) {
int f;
float data;
for (f = 0; f < 4; f++)
*(&data + f) = read_rom(f + n);
return(data);
}
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I've tried to delete eeprom or clock ic's from sheme and from program - no effect. Can't read i2c. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon Aug 06, 2007 1:15 am |
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1. Make a simple test program, similar to the one in this post:
http://www.ccsinfo.com/forum/viewtopic.php?t=30346&start=10
2. Don't use your eeprom routines. Use the CCS driver for the 24LC64.
Here is the driver file location:
| Quote: | | c:\Program Files\picc\Drivers\2464.c |
3. Make sure that you have a pull-up resistor (4.7K) on SDA and
also on SCL.
4. Make sure the address pins on the eeprom (A0, A1, A2) are
all connected to ground. Also connect the WP pin to ground.
5. Post your compiler version. You can find it at the top of the .LST
file, which is in your project directory. The version number is a 4-digit
number in this format: x.xxx
Last edited by PCM programmer on Mon Aug 06, 2007 1:26 am; edited 1 time in total |
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40inD
Joined: 30 Jul 2007
Posts: 112
Location: Moscow, Russia
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| Posted: Mon Aug 06, 2007 1:24 am |
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I have pull-up resistors on SDA and SCL...
I will try 2464.c...
And what about RTC? |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon Aug 06, 2007 1:27 am |
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For this test, disconnect all other i2c chips from the i2c bus, except for
the eeprom. |
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