runtime Parametric rs232 settings-read,write parametric port

[passstill]

Hello everybody,

I want to move from PicBasic language to CCS C language, to do this I have to solve before some ‘’minor’’ problems.

1th existential problem)

I need to change the Rs232 configuration (e.g baudrate, parity) at run-time;
I mean (and for me it’s really hard to explain it in english the Rs232 configuration port settings are saved in EEPROM (something like a SW configuration), during the execution of the program the setting values are read and used to set the Rs232 parameters.
In PicBasic language (you pardon to me) and the command more less this:

Var_port = 1 //1= PortA.0 2= PortA.1 etc
B_rate=9600
SERIN Var_port,B_rate,8,N,Var_input


2th existential problem)

I need also to read and set a parametric port;
In basic I use poke and peek command to read and write a generic pic port addressed by a variable during the program execution.
E.g.
Var_A= $7B // that’s means portA
Peek (Var_A, reade_val)

Does anyone could help a poor boy that want to move to C?

Thank you, really.
Alan

[PCM programmer]

1. Use the CCS library code for RS232 with "streams". Each stream
will be defined for different i/o pins. However, it's best to use
the hardware UART. A software UART will be created for streams
that don't use the hardware UART pins.
See the #use rs232() statement in the compiler manual.

2. Use the #byte directive to declare an i/o port as a variable.
Then write directly to it. Or, use the built-in CCS port i/o functions.
See the manual. Download it from this page:
http://www.ccsinfo.com/downloads.php

[passstill]

About the point two it's ok.
But for the point one I think I need more information
I understood that the mentioned "streams" are defined at compile time and it's not possible to change the configuration during the program execution.
I need something more complex, I would like to change the Rs232 configuration (E.g. Baud rate) at run-time.


Grazie
Alan

[PCM programmer]

For a hardware UART, you can change the baud rate at run-time with
the set_uart_speed() function. Example:

[passstill]

WOW this is what I mean a quick answer
I'll try to stress you again..... ....

Using a picbasic library for "Software Rs232", With 16F877 I make a board that receive a message from one of the four (SW)USART (Rs485, V23, Rs232(A), Rs232(B)) and resend it in one of the four (SW)USART (Rs485, V23, Rs232(A), Rs232(B)).

The user can change the configuration of the board (E.g. choosing baud rate, parity and so on) then reset it and use the board with the new configuration.
The problem now is to understand if it is possible to use CCS C RS232 library and use pins (and change at runtime the configuration) other then HW pins provided by Microchip HW USART.

Thank you again.
Alan

[PCM programmer]

I don't think you can do it with the CCS soft UART library code.

The parameters specified in each #use rs232() statement for a soft UART
are "hard coded" at compile-time. The soft UART library code does not
permit changing the parameters at run-time.

I think you will have to write your own soft UART code.