Libndls: Difference between revisions

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(→‎Keyboard: Add clear_cache())
(→‎CPU: fix signature of clear_cache())
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==CPU==
==CPU==
*<tt>clear_cache()</tt>: flushes the data cache and invalidate the instruction and data caches of the processor. Should be called before loading code dynamically, after a code patch or with self-modifying code.
*<tt>void clear_cache(void)</tt>: flushes the data cache and invalidate the instruction and data caches of the processor. Should be called before loading code dynamically, after a code patch or with self-modifying code.


==Hardware==
==Hardware==

Revision as of 15:28, 2 January 2011

libndls is a set of macros and functions available as a static library when building with Ndless. The library is automatically linked by nspire-ld if required.

These definitions are available in Ndless 1.7. Definitions marked with (C) are only available in C. Definitions marked with (asm) are only available in assembly.

Common types

  • typedef enum bool {FALSE = 0, TRUE = 1} BOOL;

Math

  • number abs(number)
  • number min(number, number)
  • number max(number, number)

Screen

  • SCREEN_BASE_ADDRESS: address of the screen buffer. Each grayscaled pixel is 4-bit long. 1111 is white, 0000 is black.
  • SCREEN_BYTES_SIZE: size of the screen buffer
  • SCREEN_WIDTH: screen width in pixels
  • SCREEN_HEIGHT: screen height in pixels
  • void clrscr(void): clears the screen

Keyboard

  • BOOL any_key_pressed(void): non-blocking key press test. Returns TRUE if one or more keys are being pressed.
  • BOOL isKeyPressed(key): non-blocking key press test. key must be one of the KEY_NSPIRE_* constants defined in include/libndls.h.

CPU

  • void clear_cache(void): flushes the data cache and invalidate the instruction and data caches of the processor. Should be called before loading code dynamically, after a code patch or with self-modifying code.

Hardware

BOOL is_touchpad : TRUE on a TI-Nspire Touchpad.

Time

  • void idle(void): switch to low-power state until the next interrupt occurs. The use of this function is encouraged when waiting in loops for an event to save the batteries.
  • void sleep(unsigned m): delay for a specified amount of time. The CPU is regularly switched to low-power state while blocking.

Debugging

  • void halt(void): stops the execution flow with an endless loop. If you are using the Ncubate emulator, use the j debugger command to jump over the instruction.
  • halt (asm) (macro): similar to halt()