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karth
Joined: 10 Sep 2003 Posts: 29
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pic30f4013, i2c problem |
Posted: Tue Oct 28, 2008 1:19 pm |
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The problem is that i2c is not functioning properly, can anyone could see what I am doing wrong ? I verified the circuit and it is fine....
Here is my code:
Code: | #use i2c(Master,sda=PIN_F2,scl=PIN_F3, FORCE_HW, SLOW) // hw I2C
#define MAXREC 2370
#define MEM_MAIN 8
#define EEPROM_SDA PIN_F2
#define EEPROM_SCL PIN_F3
void init_ext_eeprom()
{
output_float(EEPROM_SCL);
output_float(EEPROM_SDA);
}
void write_ext_eeprom(int memaddr, BYTE dat,int8 HWADDR1)
{
i2c_start();
i2c_write((0xa0|HWADDR1)&0xfe); // control byte
i2c_write(memaddr>>8);
i2c_write(memaddr);
i2c_write(dat);
i2c_stop();
delay_ms(5);
init_ext_eeprom();
}
BYTE read_ext_eeprom(int address,int8 HWADDR1)
{
BYTE data;
i2c_start();
i2c_write((0xa0|HWADDR1)&0xfe);
i2c_write(address>>8);
i2c_write(address);
i2c_start();
i2c_write(0xa1|HWADDR1);
data=i2c_read(0);
i2c_stop();
delay_ms(10);
init_ext_eeprom();
return(data);
}
void main()
{
int8 datatemp;
setup_wdt(WDT_OFF);
setup_timer1(TMR_DISABLED|TMR_DIV_BY_1);
set_tris_f(0x1f);
init_ext_eeprom();
while(TRUE)
{
write_ext_eeprom(2,'K',MEM_MAIN);
delay_ms(1000);
datatemp=read_ext_eeprom(2,MEM_MAIN);
delay_ms(1000);
}
} |
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karth
Joined: 10 Sep 2003 Posts: 29
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Posted: Tue Oct 28, 2008 1:37 pm |
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When I change to ( FORCE_SW) shown as below, it works.
Is that a bug or else???
Code: | #use i2c(Master,sda=PIN_F2,scl=PIN_F3, FORCE_SW) // hw I2C |
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