Using Multiple RS-232 Ports on a PIC® MCU or PIC® DSC
RS232 communication with CCS C compiler. The CCS C compiler provides a very simple way to do serial communication via RS232. It hides all the register settings for the user. Only the some parameters have to be provided, the rest is done by the compiler. CCS's powerful #use rs232 library has now added transmit buffering, receive buffering and flow control. API for the serial library remains unchanged ( getc, putc, printf ), existing code that uses this API can add buffering and flow control by simply changing the #use rs232 configuration. PIC serial communication tutorial Introduction to Serial communication with PIC16F877 microcontroller. CLICK here for a quick PIC serial communication tutorial. In this tutorial we will study the communication component – USART (Universal Synchronous Asynchronous Receiver Transmitter) located within the PIC.
In order to use multiple RS-232 connections on a PIC® MCU or PIC® DSC, multiple #USE RS232 pre-processor directives will need to be setup using the STREAM option. A #USE RS232 pre-processor directive will remain in effect for GETC, PUTC, PRINTF and KBHIT functions until another #USE RS232 is encountered.
The following example program shows how to read from one RS-232 port (A) and echo the data to both the first RS-232 port (A) and a second RS-232 port (B) without using the STREAM option for #USE RS232:
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The following example program will perform the same operations as the one above. The STREAM option in the #USE RS232 pre-processor directive makes the code more readable and is therefore recommended method:
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For more information or additional help about using multiple RS-232 ports on a PIC® MCU or PIC® DSC, contact CCS Technical Support.