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Altera_Forum
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11 years ago

RS232 rxd code

Hi :) i'm new here and i need some help... i work on project and i need to read from kind of machine some letters... there is an ascii code to all letter. this machine send words that i ne...
Altera_Forum's avatar
Altera_Forum
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11 years ago

The bit takes time to send. So you need to check your bit in the middle of that duration so you know for sure what bit you read. On the edges gives inacurate readings. Also, you need to pass your signal trough a synchronizer to prevent metastability.

Back to read in the middle: Once you detected the start bit (first falling edge after stopbit) you wait half the bittime and than start reading.