mirror of
https://github.com/cc65/cc65.git
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Merge pull request #626 from blackystardust/master
Added c64dtv accelerator code and documentation.
This commit is contained in:
Oliver Schmidt
GitHub
commit
305c6e7ae4
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@ -32,3 +32,11 @@ SuperCPU_Fast := $D07B
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SuperCPU_Speed_Mode := $D0B8
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SuperCPU_Detect := $D0BC
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; ---------------------------------------------------------------------------
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; C64DTV
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C64DTV_Extended_Regs := $D03F
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C64DTV_Slow = $00
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C64DTV_Fast = $03
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@ -175,9 +175,12 @@ The functions listed below are accelerator functions for the C64. See the <url
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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_scpu
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<item>scpu_get_speed
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<item>scpu_set_speed
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<item>get_c64dtv_speed
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<item>get_scpu_speed
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<item>set_c64dtv_speed
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<item>set_scpu_speed
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</itemize>
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@ -68,8 +68,11 @@ function.
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<sect1><tt/accelerator.h/<label id="accelerator.h"><p>
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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_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_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_scpu_speed" name="set_scpu_speed">
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</itemize>
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@ -2920,6 +2923,26 @@ used in presence of a prototype.
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</quote>
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<sect1>detect_c64dtv<label id="detect_c64dtv"><p>
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<quote>
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<descrip>
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<tag/Function/Check for the presence of the C64DTV.
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<tag/Header/<tt/<ref id="accelerator.h" name="accelerator.h">/
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<tag/Declaration/<tt/unsigned char detect_c64dtv (void);/
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<tag/Description/The function returns a 1 if a C64DTV 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_c64dtv_speed" name="get_c64dtv_speed">,
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<ref id="set_c64dtv_speed" name="set_c64dtv_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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@ -3479,6 +3502,28 @@ header files define constants that can be used to check the return code.
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</quote>
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<sect1>get_c64dtv_speed<label id="get_c64dtv_speed"><p>
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<quote>
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<descrip>
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<tag/Function/Get the current speed of the C64DTV.
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<tag/Header/<tt/<ref id="accelerator.h" name="accelerator.h">/
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<tag/Declaration/<tt/unsigned char get_c64dtv_speed (void);/
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<tag/Description/The function returns the current speed of the C64DTV.
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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 the C64DTV.
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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_c64dtv" name="detect_c64dtv">,
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<ref id="set_c64dtv_speed" name="set_c64dtv_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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@ -6052,13 +6097,35 @@ clean-up when exitting the program.
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</quote>
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<sect1>set_c64dtv_speed<label id="set_c64dtv_speed"><p>
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<quote>
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<descrip>
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<tag/Function/Set the current speed of the C64DTV.
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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_c64dtv_speed (unsigned char speed);/
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<tag/Description/The function returns the speed after trying to set the speed of the C64DTV.
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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 the C64DTV.
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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_c64dtv" name="detect_c64dtv">,
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<ref id="get_c64dtv_speed" name="get_c64dtv_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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<descrip>
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<tag/Function/Set the current speed of the C64/C128 SuperCPU cartridge.
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<tag/Header/<tt/<ref id="accelerator.h" name="accelerator.h">/
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<tag/Declaration/<tt/unsigned char set_scpu_speed (unsigned char speed);/
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<tag/Declaration/<tt/unsigned char __fastcall__ set_scpu_speed (unsigned char speed);/
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<tag/Description/The function returns the speed after trying to set the speed of the SuperCPU cartridge.
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<tag/Notes/<itemize>
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<item>The function is specific to the C128 and C64.
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@ -98,5 +98,43 @@ extern unsigned char detect_scpu (void);
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* 0x01 : SuperCPU cartridge present
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*/
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/* C64DTV */
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extern unsigned char __fastcall__ set_c64dtv_speed (unsigned char speed);
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/* Set the speed of the C64DTV, using SPEED_SLOW will switch to
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* slow mode, SPEED_2X or SPEED_FAST will switch to 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 switch should not fail.
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*
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* This function does not check for the presence of the C64DTV,
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* make sure you use 'detect_c64dtv();' before using.
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*/
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extern unsigned char get_c64dtv_speed (void);
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/* Get the speed of the C64DTV.
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*
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* Possible return values:
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* SPEED_1X : 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 the C64DTV,
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* make sure you use 'detect_c64dtv();' before using.
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*/
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extern unsigned char detect_c64dtv (void);
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/* Check for the presence of the C64DTV.
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*
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* Possible return values:
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* 0x00 : C64DTV not present
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* 0x01 : C64DTV present
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*/
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/* End of accelerator.h */
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#endif
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64
libsrc/c64/acc_c64dtv_speed.s
Executable file
64
libsrc/c64/acc_c64dtv_speed.s
Executable file
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@ -0,0 +1,64 @@
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;
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; Marco van den Heuvel, 2018-04-14
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;
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; extern unsigned char __fastcall__ set_c64dtv_speed (unsigned char speed);
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;
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;/* Set the speed of the C64DTV, using SPEED_SLOW will switch to
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; * slow mode, SPEED_2X or SPEED_FAST will switch to 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 the C64DTV,
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; * make sure you use 'detect_c64dtv();' before using.
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; */
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; extern unsigned char get_c64dtv_speed (void);
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;
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;/* Get the speed of the C64DTV.
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; *
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; * Possible return values:
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; * SPEED_1X : 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 the C64DTV,
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; * make sure you use 'detect_c64dtv();' before using.
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; */
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.export _set_c64dtv_speed
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.export _get_c64dtv_speed
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.include "accelerator.inc"
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_set_c64dtv_speed:
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cmp #SPEED_2X
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bcs high_speed
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low_speed:
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ldx #C64DTV_Slow
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set_speed:
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.byte $32,$99 ; SAC #$99 set accumulator to reg 9 (cpu control)
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txa ; (re)set skip and burst bits
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.byte $32,$00 ; SAC #$00 set accumulator back to reg 0
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jmp _get_c64dtv_speed
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high_speed:
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ldx #C64DTV_Fast
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bne set_speed
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_get_c64dtv_speed:
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.byte $32,$99 ; SAC #$99 set accumulator to reg 9 (cpu control)
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tax
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.byte $32,$00 ; SAC #$00 set accumulator back to reg 0
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txa
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and #C64DTV_Fast
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bne in_fast_mode
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lda #$00
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.byte $2C
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in_fast_mode:
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lda #$01
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ldx #$00
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rts
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44
libsrc/c64/acc_detect_c64dtv.s
Executable file
44
libsrc/c64/acc_detect_c64dtv.s
Executable file
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@ -0,0 +1,44 @@
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;
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; Marco van den Heuvel, 2018-04-14
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;
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; unsigned char detect_c64dtv (void);
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;
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;/* Check for the presence of the C64DTV.
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; *
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; * Possible return values:
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; * 0x00 : C64DTV not present
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; * 0x01 : C64DTV present
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; */
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.export _detect_c64dtv
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.include "accelerator.inc"
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_detect_c64dtv:
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ldy C64DTV_Extended_Regs
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lda #$00
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ldx $D000
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; Make sure the CPU is a 6510
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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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lda #$01
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sta C64DTV_Extended_Regs
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; Check if $D000 is mirrored at $D040
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cpx $D040
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bne found
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inc $D000
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cpx $D040
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bne not_found
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found:
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lda #$01
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.byte $2C
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not_found:
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lda #$00
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stx $D000
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ldx #$00
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sty C64DTV_Extended_Regs
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rts
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@ -1,9 +1,13 @@
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CL ?= cl65
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all: c64-scpu-test.prg c128-scpu-test.prg
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all: c64-scpu-test.prg c128-scpu-test.prg c64dtv-test.prg
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c64-scpu-test.prg: c64-c128-scpu-test.c
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$(CL) -t c64 c64-c128-scpu-test.c -o c64-scpu-test.prg
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c128-scpu-test.prg: c64-c128-scpu-test.c
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$(CL) -t c128 c64-c128-scpu-test.c -o c128-scpu-test.prg
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c64dtv-test.prg: c64dtv-test.c
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$(CL) -t c64 c64dtv-test.c -o c64dtv-test.prg
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8
testcode/lib/accelerator/c64dtv-test.c
Executable file
8
testcode/lib/accelerator/c64dtv-test.c
Executable file
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@ -0,0 +1,8 @@
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/* C64DTV accelerator test code. */
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#define ACC_DETECT detect_c64dtv
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#define ACC_GET_SPEED get_c64dtv_speed
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#define ACC_SET_SPEED set_c64dtv_speed
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#define ACC_NAME "C64DTV"
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#include "turbo-test.c"
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