deczerdenz
Joined: 14 Jan 2009
Posts: 1
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| I2C Problem in PIC24 |
 Posted: Mon Feb 09, 2009 3:06 am |
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I have problem in I2C communication using PIC24FJ64GA002 as my slave.
I used LED to verify if my code is OK. To validate my code, I add "output_high(PIN_B7);" And I observed that the LED will not be high after the line "if (state >= 0x80)".
1. Why is it my code will not output high after the "if (state >= 0x80)"?
2. Is my i2c_isr_state correct?
Slave Code:
| Code: | #include <24FJ64GA002.h>
#fuses HS,NOWDT,NOPROTECT
#use delay(clock=8000000)
#use rs232(baud=9600, xmit=PIN_B13, rcv=PIN_B12)
#define I2C_Address 0x60
#INT_SI2C
void SI2C_interupt()
{
//There is no point in using poll. If the ISR is called, a byte _is_ waiting
indata = 0;
indata = i2c_read();
state = i2c_isr_state();
if (state <0x80)
{ //Here read from master is required
switch (state)
{
case 0:
Caldata[0] = indata; //address
break;
case 1:
Caldata[1] = indata; //constant
break;
case 2:
Caldata[2] = indata; //constant
break;
case 3:
Caldata[3] = indata; //counter
break;
case 4:
Caldata[4] = indata; //command
break;
case 5:
Caldata[5] = indata; //checksum
break;
default: //extend states here, if more than two writes are needed
//Here master has tried to write more than two bytes
//Just ignore the data
break;
}
}
I2C1STAT_COV = 0; //0x208.6 - Receive Overflow Flag in I2CxRSR
I2C1_IWCOL = 0; // 0x208.7 - Write Collision Detect-> 1=Collision 06102008RA
I2C1_TBF = 0; //0x208.0 - Transmit Full Status Bit-> 1=full 06102008RA
I2C1_RBF = 0; //0x208.1 - Receive Full Status Bit -> 1=Full 06102008RA
if (state >= 0x80)
{
data = 0xff;
switch (state)
{
case 0x80:
i2c_write(0);
checksum = 0;
break;
case 0x81:
data = 0x30;
transmit[state] = data;
i2c_write(transmit[state]);
break;
case 0x82:
data = 0x35;
transmit[state] = data;
i2c_write(transmit[state]);
break;
case 0x83:
data = 0;
transmit[state] = data;
i2c_write(transmit[state]);
break;
case 0x84:
data = 0;
transmit[state] = data;
i2c_write(transmit[state]);
break;
case 0x85:
data = speed_settingA & 0x0f;
{
if (input(sense) == 0)
data |= 0x20;
if (input(sense1) == 0)
data |= 0x40;
if (input(error) == 1)
data |= 0x80;
if (input(error) || input(error1) == 1)
data |= 0x80;
}
transmit[state] = data;
i2c_write(transmit[state]);
break;
case 0x86:
break;
case 0xB9:
transmit[state] = checksum;
i2c_write(transmit[state]);
break;
default:
break;
}
checksum += transmit[state];
}
} |
Can anyone help me?
Thank you very much. |
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