ram.st

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#include <RTOS_Variables.h>
#include <RTOS_Header.h>

VAR_EXTERNAL
	pEndMem			: ^void;
	pNextMem		: ^void;
END_VAR

// This function serves as an interface to the RAM-class
// It has to be compiled with any project using the RTDB-object-loader.
// If this project doesn't use RAM-classes, this function will always
// return C_OK. Otherwise a static RAM-method is called to allocate memory
// for the retentive part of RAM-objects.
//
FUNCTION GLOBAL _GetRAM
VAR_OUTPUT
	ret_code   : ConfStates;
END_VAR

#ifdef LSL_TEST
	// If You do not want to have additional checks and
	// debug traces, just undefine the  constant LSL_TEST
	// in the global header file of this project.
//	#pragma message ("Compiling a test version!")
#endif

	IF _RtOSversion < 16#0500 THEN
	//	With old projects, no check is performed, malloc isn't used
	//	With new projects, a trace message is generated, malloc is used

#ifdef DONT_CHECK_OS_0500	// OS-version too old?
	//	Please download an OS with version greater or equal 5.00.
	//	With the currently used version You might face memory problems.
	//
	//	The various OS-versions can be found in the LASAL installation
	//	directory (i.e. c:\program files\lasal\class\OS Versions).
	//	The new OS can be downloaded by selecting the menu item
	//	'debug\extras\download OS'.
	//	Please make sure the downloaded OS version meets Your requirements
	//	(i.e. graphic/text mode, resolution, IPC/x386).

		TRACE("OS-version too old. Doubleclick for more information!");
#endif // DONT_CHECK_OS_0500
	END_IF;

	ret_code	:= C_OK;

END_FUNCTION
#ifndef DONT_CHECK_OS_0500	// OS-version too old?

#ifdef MAX_MEMORY			// only with new LASAL and Loader-Versions
#ifndef MAX_MEM

TYPE

#ifdef TARGET_IPC
#define USE_MEM	16#100000   // memory area used by the alloc-command
#elif TARGET_DIAS
#define USE_MEM 16#80000
#else	// TARGET_ANY
#define USE_MEM 16#1E000
#endif

							// keep space for ordinary variables
#define MAX_MEM (MAX_MEMORY-16#2000)

#if MAX_MEM < USE_MEM		// can be defined in global.h
							// in the project-directory
#undef	USE_MEM
#define USE_MEM MAX_MEM		// MAX_MEMORY is set when compiling
							// during online operation

#pragma message ("===> Configuration Is Adjusted To Currently Used Target")
#pragma message ("     max. Size of Data Segment: " MAX_MEMORY)
#endif // MAX_MEM		

	FreeMemory		: ARRAY[0..USE_MEM-1] OF USINT;

END_TYPE

VAR_PRIVATE

	aDummyBlock		AT % M 1100	: ARRAY[0..16#125] OF USINT;
	aMemBlock					: FreeMemory;

END_VAR

// Initializes the pointers to start and end of the 
// free memory block. When the project is compiled online
// MAX_MEMORY contains the maximum data size of the
// target system.
//
FUNCTION GLOBAL _alloc_init

	pNextMem        := #aMemBlock $ void;
	pEndMem         := #aMemBlock $ void + (sizeof(FreeMemory)-1);

END_FUNCTION
#define _ALLOC_INIT_IS_DEFINED_

#endif // !MAX_MEM
#endif // MAX_MEMORY
#endif // DONT_CHECK_OS_0500

#ifndef _ALLOC_INIT_IS_DEFINED_
FUNCTION GLOBAL _alloc_init

	pNextMem	:=
	pEndMem		:= NIL;		// this indicates, that malloc can be used

END_FUNCTION
#endif // _ALLOC_INIT_IS_DEFINED_