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Bitbanging C sample Code

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suvarna_mtech

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Hi,

I am using P89C61X2 controller.
I want to connect one serial interfacing device to controller.
I am connecting it through bit banging.
I am not able to put time out, if the device not responds me.
Please help me out.


I am connecting device with 19200 bps,
I am confuse my used bit time is OK or not.
If my device is disconnected, my program is not timed out.
Controller remains in the loop
 

Hi,

Thanks for the help.
I am not using interrupt.

Here is the code

BRXD = 1; //This is port pin which i'm using as receive
while(BRXD); //When data receives, Receive Pin goes low. Here i'm waiting for bit to receive. I am confuse how i put timeout here. I want this to timeout if data not receives in specified time interval

Bit_Time(BIT_TIME/2); //Wait 1/2 bit-time to sample in middle
for(; i < 8; i++) // Send 8 bits to the I2C Bus
{
inbyte = inbyte >>1;
Bit_Time(BIT_TIME);

if(BRXD)
inbyte |= 0x80;
else
inbyte &= ~(0x80);

}
return inbyte;
 

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