mirror of
https://github.com/cc65/cc65.git
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Added C128 in C64 mode accelerator code and documentation.
This commit is contained in:
Marco van den Heuvel
parent
305c6e7ae4
commit
3f5683b391
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@ -40,3 +40,10 @@ C64DTV_Extended_Regs := $D03F
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C64DTV_Slow = $00
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C64DTV_Fast = $03
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; ---------------------------------------------------------------------------
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; C128 in C64 mode
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C128_VICIIE_CLK := $D030
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@ -176,10 +176,13 @@ url="funcref.html" name="function reference"> for declaration and usage.
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<itemize>
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<item>detect_c64dtv
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<item>detect_c128
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<item>detect_scpu
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<item>get_c64dtv_speed
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<item>get_c128_speed
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<item>get_scpu_speed
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<item>set_c64dtv_speed
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<item>set_c128_speed
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<item>set_scpu_speed
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</itemize>
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@ -69,10 +69,13 @@ function.
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<itemize>
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<item><ref id="detect_c64dtv" name="detect_c64dtv">
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<item><ref id="detect_c128" name="detect_c128">
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<item><ref id="detect_scpu" name="detect_scpu">
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<item><ref id="get_c64dtv_speed" name="get_c64dtv_speed">
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<item><ref id="get_c128_speed" name="get_c128_speed">
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<item><ref id="get_scpu_speed" name="get_scpu_speed">
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<item><ref id="set_c64dtv_speed" name="set_c64dtv_speed">
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<item><ref id="set_c128_speed" name="set_c64dtv_speed">
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<item><ref id="set_scpu_speed" name="set_scpu_speed">
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</itemize>
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@ -2943,6 +2946,26 @@ used in presence of a prototype.
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</quote>
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<sect1>detect_c128<label id="detect_c128"><p>
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<quote>
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<descrip>
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<tag/Function/Check for the presence of a C128 in C64 mode.
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<tag/Header/<tt/<ref id="accelerator.h" name="accelerator.h">/
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<tag/Declaration/<tt/unsigned char detect_c128 (void);/
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<tag/Description/The function returns a 1 if a C128 in C64 mode has been detected.
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<tag/Notes/<itemize>
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<item>The function is specific to the C64.
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</itemize>
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<tag/Availability/cc65 (not all platforms)
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<tag/See also/
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<ref id="get_c128_speed" name="get_c128_speed">,
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<ref id="set_c128_speed" name="set_c128_speed">,
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<tag/Example/None.
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</descrip>
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</quote>
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<sect1>detect_scpu<label id="detect_scpu"><p>
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<quote>
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@ -3524,6 +3547,28 @@ header files define constants that can be used to check the return code.
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</quote>
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<sect1>get_c128_speed<label id="get_c128_speed"><p>
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<quote>
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<descrip>
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<tag/Function/Get the current speed of the C128 in C64 mode.
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<tag/Header/<tt/<ref id="accelerator.h" name="accelerator.h">/
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<tag/Declaration/<tt/unsigned char get_c128_speed (void);/
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<tag/Description/The function returns the current speed of the C128 in C64 mode.
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<tag/Notes/<itemize>
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<item>The function is specific to the C64.
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<item>The function does not check for the presence of a C128 in C64 mode.
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<item>See the accelerator.h header for the speed definitions.
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</itemize>
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<tag/Availability/cc65 (not all platforms)
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<tag/See also/
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<ref id="detect_c128" name="detect_c128">,
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<ref id="set_c128_speed" name="set_c128_speed">,
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<tag/Example/None.
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</descrip>
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</quote>
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<sect1>get_scpu_speed<label id="get_scpu_speed"><p>
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<quote>
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@ -6119,6 +6164,28 @@ clean-up when exitting the program.
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</quote>
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<sect1>set_c128_speed<label id="set_c128_speed"><p>
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<quote>
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<descrip>
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<tag/Function/Set the current speed of a C128 in C64 mode.
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<tag/Header/<tt/<ref id="accelerator.h" name="accelerator.h">/
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<tag/Declaration/<tt/unsigned char __fastcall__ set_c128_speed (unsigned char speed);/
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<tag/Description/The function returns the speed after trying to set the speed of the C128 in C64 mode.
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<tag/Notes/<itemize>
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<item>The function is specific to the C64.
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<item>The function does not check for the presence of a C128 in C64 mode.
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<item>See the accelerator.h header for the speed definitions.
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</itemize>
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<tag/Availability/cc65 (not all platforms)
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<tag/See also/
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<ref id="detect_c128" name="detect_c128">,
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<ref id="get_c128_speed" name="get_c128_speed">,
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<tag/Example/None.
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</descrip>
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</quote>
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<sect1>set_scpu_speed<label id="set_scpu_speed"><p>
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<quote>
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@ -136,5 +136,44 @@ extern unsigned char detect_c64dtv (void);
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* 0x01 : C64DTV present
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*/
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/* C128 in C64 mode */
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extern unsigned char __fastcall__ set_c128_speed (unsigned char speed);
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/* Set the speed of the C128 CPU, using SPEED_SLOW will switch to
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* 1 Mhz (slow) mode, SPEED_2X or SPEED_FAST will switch to 2Mhz (fast) mode.
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*
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* Note that any value higher or equal to SPEED_2X will switch to fast mode.
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*
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* This function will return the actual speed the CPU is at after trying
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* to set the requested speed, to my knowledge the switching should not fail.
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*
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* This function does not check for the presence of a C128 in C64 mode,
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* make sure you use 'detect_c128();' before using.
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*/
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extern unsigned char get_c128_speed (void);
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/* Get the speed of the C128 CPU.
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*
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* Possible return values:
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* SPEED_SLOW : Slow mode
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* SPEED_2X : Fast mode
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*
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* This function does not check for the presence of a C128 in C64 mode,
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* make sure you use 'detect_c128();' before using.
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*/
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extern unsigned char detect_c128 (void);
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/* Check for the presence of a C128 in C64 mode.
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*
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* Possible return values:
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* 0x00 : C128 in C64 mode not present
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* 0x01 : C128 in C64 mode present
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*/
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/* End of accelerator.h */
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#endif
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53
libsrc/c64/acc_c128_speed.s
Executable file
53
libsrc/c64/acc_c128_speed.s
Executable file
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@ -0,0 +1,53 @@
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;
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; Marco van den Heuvel, 2018-04-20
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;
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; extern unsigned char __fastcall__ set_c128_speed (unsigned char speed);
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;
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;/* Set the speed of the C128 CPU, using SPEED_SLOW will switch to
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; * 1 Mhz (slow) mode, SPEED_2X or SPEED_FAST will switch to 2Mhz (fast) mode.
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; *
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; * Note that any value higher or equal to SPEED_2X will switch to fast mode.
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; *
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; * This function will return the actual speed the CPU is at after trying
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; * to set the requested speed, to my knowledge the switching should not fail.
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; *
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; * This function does not check for the presence of a C128 in C64 mode,
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; * make sure you use 'detect_c128();' before using.
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; */
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; extern unsigned char get_c128_speed (void);
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;
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;/* Get the speed of the C128 CPU.
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; *
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; * Possible return values:
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; * SPEED_SLOW : Slow mode
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; * SPEED_2X : Fast mode
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; *
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; * This function does not check for the presence of a C128 in C64 mode,
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; * make sure you use 'detect_c128();' before using.
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; */
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.export _set_c128_speed
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.export _get_c128_speed
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.include "accelerator.inc"
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_set_c128_speed:
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cmp #SPEED_2X
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bcs high_speed
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store_speed:
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sta C128_VICIIE_CLK
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jmp _get_c128_speed
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high_speed:
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lda #$01
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bne store_speed
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_get_c128_speed:
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lda C128_VICIIE_CLK
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and #$01
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ldx #$00
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rts
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33
libsrc/c64/acc_detect_c128.s
Executable file
33
libsrc/c64/acc_detect_c128.s
Executable file
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@ -0,0 +1,33 @@
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;
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; Marco van den Heuvel, 2018-04-20
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;
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; unsigned char detect_c128 (void);
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;
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;/* Check for the presence of a C128 in C64 mode.
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; *
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; * Possible return values:
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; * 0x00 : C128 in C64 mode not present
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; * 0x01 : C128 in C64 mode present
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; */
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.export _detect_c128
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.include "accelerator.inc"
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_detect_c128:
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lda #$00
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tax
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; Make sure the CPU is a 8502
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.byte $1A ; NOP on 8502, INA on 65(S)C(E)02, 4510 and 65816
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bne not_found
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; Make sure a C128 VICIIe is present
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ldy C128_VICIIE_CLK
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cpy #$FF
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beq not_found
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found:
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lda #$01
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not_found:
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rts
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@ -1,6 +1,6 @@
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CL ?= cl65
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all: c64-scpu-test.prg c128-scpu-test.prg c64dtv-test.prg
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all: c64-scpu-test.prg c128-scpu-test.prg c64dtv-test.prg c64-c128-test.prg
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c64-scpu-test.prg: c64-c128-scpu-test.c
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$(CL) -t c64 c64-c128-scpu-test.c -o c64-scpu-test.prg
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@ -11,3 +11,5 @@ c128-scpu-test.prg: c64-c128-scpu-test.c
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c64dtv-test.prg: c64dtv-test.c
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$(CL) -t c64 c64dtv-test.c -o c64dtv-test.prg
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c64-c128-test.prg: c64-c128-test.c
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$(CL) -t c64 c64-c128-test.c -o c64-c128-test.prg
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8
testcode/lib/accelerator/c64-c128-test.c
Executable file
8
testcode/lib/accelerator/c64-c128-test.c
Executable file
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@ -0,0 +1,8 @@
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/* C128 in C64 mode accelerator test code. */
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#define ACC_DETECT detect_c128
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#define ACC_GET_SPEED get_c128_speed
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#define ACC_SET_SPEED set_c128_speed
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#define ACC_NAME "C128 in C64 mode"
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#include "turbo-test.c"
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