Code Optimizer

Frequently Asked Questions Using Multiple RS-232 Ports on a PIC ® MCU or PIC ® DSC. 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 beauty of these operators is that the x and y in the above examples can be any combination of function, RS232 serial stream, variable, string and more. One of the key features of this new feature in the CCS C Compiler is the way it automatically handles the conversion based upon the data types of the variables passed. For this, we will use an IC called MAX232. Which is a level translator that helps the PIC Microcontroller to connect with a PC using RS-232 telecommunications standard. This can be achieved using a DB9 connector. If your PC doesn’t have a DB9 port, you might want to use an RS232 to USB converter. Also, you may directly use a TTL to USB converter. Tutorial para usar la comunicacion serial en los microcontroladores PIC con el compilador CCs. PIC serial communication tutorial. RS232 uses voltages below (-5V)to represent a logical level '1', and voltages above (5V)to represent a logical level '0'. Therefore, to use this protocol we need voltage level conversion. This is possible using the device such as the MAX232.

Version 5 is the first release to include a very aggressive code optimizer, optimizing for space instead of speed. The new optimizer is able to search the entire compiled program to find repeating blocks of code whereby reducing all those repeating blocks into one shared sub-routine. Optimizer is executed during the final phase of the compile which presents the ability to cross a unit boundary when performing the optimization.

#opt compress: This new optimization level can be achieved by adding this line of code into your project.

The average size reduction of program memory is approximately 15%. In some cases we have seen program memory reduced by 60%. Provided below are examples of compression levels:

Optimization Level Efficiency	Compiler Versions
Optimization Level Efficiency	V4.141	V5.006
File / Processor	(Program Memory Bytes)		Reduction %
ex_modbus_master.c PIC16F1937	3926	3068	22.00%
ex_j1939.c PIC18F4580	7552	6166	18.00%
ex_st_webserver2.c PIC18F4550 + ENC28J60	60282	52664	12.00%

This new optimization level is supported on Enhanced PIC16 and PIC18 microcontrollers.

Improved standardization

CCS C Compiler Version 5 has been updated to follow conventional C standards:

The .h file for specific PIC^® MCU are now prototyped. Now included are prototypes of the compiler's built-in functions and
Standard C libraries iso646.h and stdbool.h have been added.

Multiple Compiler Versions

Version 5 IDE now supports previous versions of compiler allowing you to choose amongst legacy versions to use. This feature provides for standardization on a specific version based on projects, testing or certifications.

Project Notes

Now, with each project, you'll be able to create a 'Project Notes' file. This file allows you to create notes pertaining to each project. Each of these files can be associated to a particular project via the menu or Files navigation pane.

Identifier Explorer

The new 'Identifier Explorer' in Version 5 IDE allows for a quick and easy way to view the relationship between program identifiers. For example; which variables and functions are declared in each file, or to see all functions that access a global variable. This screen shot shows for a single function all global variables accessed, as well as, local variables and functions called.

Files navigation panel

The style and functionality of the 'Files Navigation Panel' has been improved and simplified. For example; it is much easier to add units, for linking, or to add other C and H files in single compilation unit projects.

Project History

Version 5 now automatically maintains a history of source code changes. The IDE can be configured to specify how often and how many old files to be saved (maintain old file on every save, once an hour, once a day, etc). The File Compare utility inside the IDE also keeps this history and allows you to compare a current file to an older file from history.

Show in Explorer

The right-click 'Show in Explorer' is now available on the editor tabs. This allows you to open an explorer window at the destination of the file.

Save to notes

The option to 'Save to notes' has been added to the right-click menu of multiple debug windows which will append the selected data (such as break log or RAM data) to the end of the notes file associated to the project.

Mouse-over Watch

Hovering over any structure or array variable while debugging will now allow you to expand or collapse a pop-up note in the 'watch window'.

Drag and drop 'watch items'.

Have an important watch variable that is in the middle or at the bottom of your watch list? You can now drag and drop watch items within the watch window to reorder them by your preference.

Superbar

The Superbar has been slightly re-arranged to emphasize more commonly used items. Our C editor has been updated with instant syntax checking, column editing, smart highlighting and searching with regular expressions. Debugger improvements make it easier to watch complicated variables like arrays and structs.

Statistic Viewer

The convenient Statistic viewer graphically displays the percentage amount of program memory, data memory and stack space. The Functions section graphically shows which functions use the most program memory or data memory in a pie chart. This is very useful for quickly determining which functions the user might need to review if the user is looking for ways to optimize the program to use less memory.

Tree Viewer

The revamped Tree viewer shows the call tree graphically. Each function of the call tree is represented by a block. Now the user can drag-and-drop the placement of the blocks. It is also possible to hide branches of the call tree and only inspect the calls out of one function.

Live Syntax Checker

The Editor now has a live syntax checker. Any code errors that would prevent the project from compiling will be displayed with a red-underline under the offending syntax. This check is done live while you are typing. To view the syntax error, simply hover the mouse over the underling.

Copy Project Tool

Use our Copy project tool to copy all relevant files in your project to a new directory or ZIP file.

Copy Find and Search Tool

The sharpened Find and Search tool can now use regular expressions. Regular expressions allow the user to enter complex parameters into the search field for matching specific combinations of characters, digits or phrases. In the example screenshot, foob([0-9]|a+)r is entered which would find 'foob0r', 'foob1r', 'foobar', 'foobaar', etc.

Find Tools

The Editor has an improved 'Find all References' and 'Find Delcaration' tool. These unique new tools can be selected by right clicking on an identifier in the editor. 'Find All References' finds all the references of this identifier, while intelligently skipping over any commented references or similar identifiers that don't match because of overloading. 'Find Declaration' will find the location where the identifier was declared.

Bookmark Tool

The advanced Bookmark tool is now project specific and spans all files in the project. The menu will also show you the locations where bookmarks were set.

Build and Run Tool

Our Compile menu now has a new 'Build and Run' tool that will compile the program and program it to the microcontroller with one simple mouse click.

Column Editing

The Editor tool also has a column editin

Comunicacion Serial Rs232 Pic Ccs