Libndls

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Revision as of 14:52, 4 March 2011 by ExtendeD (talk | contribs) (→‎Keyboard: Touchpad API)
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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 (asm) are only available in assembly.

Common types

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

Data manipulation

  • uint16_t bswap16(uint16_t): swap the bytes of a 2-bytes integer
  • uint32_t bswap32(uint32_t): swap the bytes of a 4-bytes integer

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

UI

  • void show_msgbox(const char *title, const char *msg): show a message box, with a single button OK"

Keyboard

  • BOOL any_key_pressed(void): non-blocking key press test. Return 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/common.h.
  • void wait_key_pressed(void): block until a key is pressed
  • void wait_no_key_pressed(void): block until all the keys are released
  • touchpad_info_t *touchpad_getinfo(void): return information on the Touchpad area such as its dimension. Return NULL if not a TI-Nspire Touchpad. See include/libndls.h for the definition of touchpad_info_t.
  • int touchpad_scan(touchpad_report_t *report): check user interactions with the Touchpad area and writes to report. See include/libndls.h for the definition of touchpad_report_t. report->contact is always FALSE on TI-Nspire Clickpad. See src/arm/tests/ndless_tpad.c for an example of use.

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()