3 serial ports on pic with independent baud rate and parity
I need 4 serial port on pic.
1 of them if for PC, so baud rate and parity isn't important.
For other 3 ports
1. must be 2400,8,E,1 - for now work fine with serin2 and define 9bits.
2. must be 9600,8,N,1 - For that I also try to use serin2, but mode is 84. And i had no luck... Modem doesn't recognise commands. If I remove define 9bit it works.
3. must be user define, baud rate 2400 or 9600, with or without parity.
I'm using PIC18F87J50, there are 2 hardvare usart.
3. port is problem... If I don't have 3. port then I would use, serin/out for port 1. And hserin/out for other ports...
Does anyone have an idea how to do this?
Re: 3 serial ports on pic with independent baud rate and parity
Do not use DEFINEs for the hardware ports, work the registers directly. Then use SERIN2/SEROUT2 as normal.
Re: 3 serial ports on pic with independent baud rate and parity
Thats ok, if i only chande BR, but what with parity?
Re: 3 serial ports on pic with independent baud rate and parity
From section 20.2 of the data sheet
Quote:
The EUSART transmits and receives the LSb first. The
EUSART’s transmitter and receiver are functionally
independent but use the same data format and baud
rate. The Baud Rate Generator produces a clock, either
x16 or x64 of the bit shift rate, depending on the BRGH
and BRG16 bits (TXSTAx<2> and BAUDCONx<3>).
Parity is not supported by the hardware but can be
implemented in software and stored as the 9th data bit.
Re: 3 serial ports on pic with independent baud rate and parity
Yes I know that...
But I think you didn't understand me...
Let me try to explain again...
Let say that I use define ser2 9 bit, define parity even, and use that for 1. port. For 2. port to use HSERIN,
But then if user want to enable parity on 3. port there is problem...
If I use HSERIN2 I must put DEFINE HSER_BITS 9 that option should be enabled from PC.
So I can't just put If useparity=1 then define hser 9bits etc...
I was thinking if there is define ser2 9 bit, and use mode for 8 bit that it should send 8 bit, but it send 9 bit...<small>
</small>
Re: 3 serial ports on pic with independent baud rate and parity
Quote:
I was thinking if there is define ser2 9 bit, and use mode for 8 bit that it should send 8 bit, but it send 9 bit...
Look in the PBP manual to see how to use the second hardware port.
Re: 3 serial ports on pic with independent baud rate and parity
Thank you.
Think I'll have something...