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Will this work ?? (While loop related)

 
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jacqueskleynhans



Joined: 10 Apr 2008
Posts: 109
Location: Cape Town, South Africa

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Will this work ?? (While loop related)
PostPosted: Thu Oct 21, 2010 3:11 pm     Reply with quote
Hi Guys, Can really test this code because I am @ home, only in the lab tomorrow. Just wondering if the while would cause inf loop. I am sending about 50 commands like this one
Code:
write(OV5620_WRITE_ADDR, 0x12, 0x80);
But instead of adding a delay after the i2c stop i would rather check to see whether the device is still busy. ANy tips or comments ?


Code:
int8 write(int8 cmd1,int8 cmd2,int8 cmd3)
    {
        while(!camera_ready());
        {
        i2c_start();
        i2c_write(int8 cmd1);
        i2c_write(int8 cmd2);
        i2c_write(int8 cmd3);
        i2c_stop();
        }
    }


Code:
int1 camera_ready()
 {
   int1 ack;
   i2c_start();            // If the write command is acknowledged,
   ack = i2c_write(0x60);  // then the device is ready.
   i2c_stop();
   return !ack; 
}


Thanks.
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PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Thu Oct 21, 2010 3:27 pm     Reply with quote
What if your i2c slave device is detached or defective ? You'll never get
an ACK in that case. Then how do you ever get out of the loop ? Maybe
a WDT reset ? Or, add a timeout count and return an error code if it
times out.
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