timer.c

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/*****************************************************************************
 * ugBASIC - an isomorphic BASIC language compiler for retrocomputers        *
 *****************************************************************************
 * Copyright 2021-2026 Marco Spedaletti (asimov@mclink.it)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *----------------------------------------------------------------------------
 * Concesso in licenza secondo i termini della Licenza Apache, versione 2.0
 * (la "Licenza"); è proibito usare questo file se non in conformità alla
 * Licenza. Una copia della Licenza è disponibile all'indirizzo:
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Se non richiesto dalla legislazione vigente o concordato per iscritto,
 * il software distribuito nei termini della Licenza è distribuito
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 * implicite. Consultare la Licenza per il testo specifico che regola le
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 ****************************************************************************/
 
/****************************************************************************
 * INCLUDE SECTION 
 ****************************************************************************/
 
#include "../../ugbc.h"
 
/****************************************************************************
 * CODE SECTION 
 ****************************************************************************/

Variable * get_timer( Environment * _environment ) {
 
    Variable * result = variable_temporary( _environment, VT_WORD, "(result of get timer)");
 
    char resultAddress[MAX_TEMPORARY_STORAGE]; 
    cpu_move_8bit( _environment, "$A2", result->realName );
    sprintf(resultAddress, "%s", address_displacement(_environment, result->realName, "1") );
    cpu_move_8bit( _environment, "$A1", resultAddress );
    // sprintf(resultAddress, "%s", address_displacement(_environment, result->realName, "2") );
    // cpu_move_8bit( _environment, "$A2", resultAddress );
    
    return result;
    
}

/* <usermanual>
@keyword TIMER
</usermanual> */
 
void set_timer( Environment * _environment, char * _value ) {
 
    Variable * value = variable_retrieve_or_define( _environment, _value, VT_WORD, 0 );
 
    char valueAddress[MAX_TEMPORARY_STORAGE]; 
    cpu_move_8bit( _environment, value->realName, "$A2" );
    sprintf(valueAddress, "%s", address_displacement(_environment, value->realName, "1") );
    cpu_move_8bit( _environment, valueAddress, "$A1" );
    cpu_move_8bit( _environment, "#0", "$A0" );
        
}