Bloader and UART

Support for Bloader and Screamer

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Cyb
Posts: 3
Joined: Sat Apr 16, 2005 7:23 am

Bloader and UART

Post by Cyb » Wed Sep 23, 2009 1:36 pm

Hello,

As I understand TTL <--> RS232 signal levels. Is it possible to invert every bytes send and received inside the Bootloader program to not use a max232 to program the device ?
Thank you.
LPL

icserny
Posts: 2
Joined: Sat Oct 09, 2010 12:21 pm

Re: Bloader and UART

Post by icserny » Sat Oct 09, 2010 12:55 pm

No! You have to invert the whole stuff, the polarity of the Mark and Space levels as well. However, the inverting of the logic levels can be done in your PIC (see TXCKP and RXDTP bits in the BAUDCON register).

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