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victor pasilla Guest
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I2C slave not work |
Posted: Fri Jan 19, 2007 12:33 pm |
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i am trying to communicate 2 pic using the I2C bus,
master generate sda and sdl signals, but the slave not responds,
this is the code for the master
....
..
#use I2C(master,sda=PIN_B0, scl=PIN_B1))
.....
.....
while (TRUE){
i2c_start();
if ( i2c_write(0xa1)==0){
resultadoADC[0] = i2c_read();
resultadoADC[1] = i2c_read();
}
i2c_stop();
delay_ms(100);
}
....
....
this is the code for the slave
...
...
#use I2C(slave,address=0xa0,sda=PIN_B0, scl=PIN_B1))
int8 resultadoADC[2];
int16 lectura;
#INT_SSP
void ssp_interupt ()
{
BYTE state;
state = i2c_isr_state();
if(state == 0x80) //Master is requesting data
{
output_toggle(pin_B5); //flag
resultadoADC[0]=make8(lectura,0);
resultadoADC[1]=make8(lectura,1);
i2c_write(resultadoADC[0]);
i2c_write(resultadoADC[1]);
}
}
void main (void){
enable_interrupts(GLOBAL);
enable_interrupts(INT_SSP);
i2c_SlaveAddr(0xa0);
setup_adc( ADC_CLOCK_INTERNAL );
setup_adc( AN0);
set_adc_channel(0);
output_low(pin_B5);
while (TRUE){
lectura = read_adc();
output_toggle(pin_B4); // flag
}
}
can you helpme please |
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Mark
Joined: 07 Sep 2003 Posts: 2838 Location: Atlanta, GA
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Posted: Fri Jan 19, 2007 1:16 pm |
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Which PIC |
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Guest
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Posted: Fri Jan 19, 2007 1:26 pm |
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sorry,....
i am using two pics 18F4550 |
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