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USB Low-Full-High Speed Peripherals

Anonymous
Not applicable

 Hi.

   

I trying to slave fifo in fx2lp 56pin.

   

And i now see the following example about slave fifo.

   

But i don't know what whether IOC used to output or input.

   

 

   

Could you please let me now about the direction of "IOC" ?

   

Also, what is different between "IOC & 0x02" and "IOC|=0x01"? i don't know what they have meaning.

   

Thanks.

   

 

   

 

   

void TD_Poll( void )

   

   

if(!(IOC & 0x02))

   

{

   

done_frm_fpga = 1;

   

}

   

if ((done_frm_fpga) && (IOC & 0x02))

   

{

   

IFCONFIG = 0x03;

   

SYNCDELAY;

   

   

IOC|=0x01; //output 1 on PC.0...SYNC signal is HIGH 

   

SYNCDELAY;

   

done_frm_fpga = 0;

   

}

   

}

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Anonymous
Not applicable

  Hi,

   

 

   

In fw.c you can see that PC.0 is configured as an Output pin and PC.1 as input as below:

   

 

   

OEC|=0x01; //PC.0 as output (SYNC signal)

   

SYNCDELAY;

   

OEC&=0xFD; //PC.1 as input (Clock changing signal)

   

 

   

SYNCDELAY;

   

 

   

It is the OEC register that determines which pin of port C acts as input, and which as output. 

   

 

   

Regards,

   

Gayathri

   
        
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