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Added VERA peek() and poke() to the cx16 library.

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They simplify C programs' direct access to VERA's internal address space.
This commit is contained in:
Greg King
2019-10-24 05:15:42 -04:00
parent 1074d35a15
commit 9fa90e2265
4 changed files with 74 additions and 5 deletions
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19
include/cx16.h
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@@ -144,9 +144,10 @@ struct __emul {
unsigned char debug; /* Boolean: debugging enabled */
unsigned char vera_action; /* Boolean: displaying VERA activity */
unsigned char keyboard; /* Boolean: displaying typed keys */
unsigned char echo; /* Boolean: Kernal output echoed to host */
unsigned char echo; /* How Kernal output should be echoed to host */
unsigned char save_on_exit; /* Boolean: save SD card when quitting */
unsigned char unused[0xD - 0x5];
unsigned char gif_method; /* How GIF movie is being recorded */
unsigned char unused[0xD - 0x6];
unsigned char keymap; /* Keyboard layout number */
const char detect[2]; /* "16" if running on x16emu */
};
@@ -173,16 +174,24 @@ signed char get_ostype (void);
** Positive -- release build
*/
void __fastcall__ set_tv (unsigned char);
/* Set the video mode the machine will use.
void __fastcall__ set_tv (unsigned char type);
/* Set the video type that the machine will use.
** Call with a TV_xx constant.
*/
unsigned char __fastcall__ videomode (unsigned char Mode);
unsigned char __fastcall__ videomode (unsigned char mode);
/* Set the video mode, return the old mode. Call with one of the VIDEOMODE_xx
** constants.
*/
unsigned char __fastcall__ vpeek (unsigned long addr);
/* Get a byte from a location in VERA's internal address space. */
void __fastcall__ vpoke (unsigned char data, unsigned long addr);
/* Put a byte into a location in VERA's internal address space.
** (addr is second instead of first for the sake of code efficiency.)
*/
/* End of cX16.h */