$Id$ __________ __ ___. Open \______ \ ____ ____ | | _\_ |__ _______ ___ Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ \/ \/ \/ \/ \/ API summmary [ This is still pretty rough and basic. Extend! ] LCD #include Generic Most LCD functions are specific for which output we work with, due to the huge differences. lcd_init() - init the LCD stuff lcd_clear_display() - clear the whole display lcd_backlight(on) - set backlight on/off lcd_puts(x,y,string) write a string at given character position Recorder All the functions operate on a display buffer. You make the buffer get shown on screen by calling lcd_update(). lcd_update() update the LCD according to the internal buffer. lcd_setfont(int font) set default font lcd_setmargins(int x, int y) set top/left margins lcd_putsxy(x,y,string,font) put a string at given position, using a specific font lcd_bitmap(src,x,y,width,height,clear) put a bitmap at given position lcd_clearrect(x,y,width,height) clear a rectangle area lcd_fillrect(x,y,width,height) fill a rectangle area lcd_drawrect(x,y,width,height) draw a rectangle lcd_invertrect(x,y,width,height) revert the graphics of the given area lcd_drawline(x1,y1,x2,y2) draw a line between the coordinates lcd_drawpixel(x,y) put a pixel on the given coordinate lcd_clearpixel(x,y) clear the pixel at the given coordinate lcd_fontsize(font,width,height) return the width and height of the font Player lcd_define_pattern(which,pattern,lenth) define a custom pattern Buttons #include These functions work the same regardless of which keypad you have, but they return a different set of values. Note that the Recorder keypad has 10 keys, while the Player keypad only features 6. int button_get(bool block) Returns a bitmask for which keys were pressed. If 'block' is set TRUE it won't return until a key is pressed. Files (These functions are POSIX look-alikes) #include int open(const char *path, int oflag); The open() function establishes the connection between a file and a file descriptor. It creates an open file descrip- tion that refers to a file and a file descriptor that refers to that open file description. The file descriptor is used by other I/O functions to refer to that file. int read(int fildes, void *buf, size_t nbyte); The read() function attempts to read nbyte bytes from the file associated with the open file descriptor, fildes, into the buffer pointed to by buf. int lseek(int fildes, off_t offset, int whence); The lseek() function sets the file pointer associated with the open file descriptor specified by fildes as follows: o If whence is SEEK_SET, the pointer is set to offset bytes. o If whence is SEEK_CUR, the pointer is set to its current location plus offset. o If whence is SEEK_END, the pointer is set to the size of the file plus offset. int write(int fildes, const void *buf, size_t nbyte); NOT CURRENTLY SUPPORTED. write writes up to count bytes to the file referenced by the file descriptor fd from the buffer starting at buf. int close(int fildes); The close() function will deallocate the file descriptor indicated by fildes. To deallocate means to make the file descriptor available for return by subsequent calls to open(2) or other functions that allocate file descriptors. int rename(const char *old, const char *new); NOT CURRENTLY SUPPORTED. The rename() function changes the name of a file. The old argument points to the pathname of the file to be renamed. The new argument points to the new pathname of the file. int remove(const char *pathname); NOT CURRENTLY SUPPORTED. remove deletes a name from the filesystem. It calls unlink for files, and rmdir for directories. Directories #include DIR *opendir(const char *name); The opendir() function opens a directory stream corresponding to the directory name, and returns a pointer to the directory stream. The stream is positioned at the first entry in the directory. struct dirent *readdir(DIR *dir); The readdir() function returns a pointer to a dirent structure representing the next directory entry in the directory stream pointed to by dir. It returns NULL on reaching the end-of-file or if an error occurred. Add a description of the struct here. int closedir(DIR *dir); The closedir() function closes the directory stream associated with dir. The directory stream descriptor dir is not available after this call. String/Memory #include strcmp() strcpy() memcpy() memset() ... Memory allocation #include void *malloc(size_t size); malloc() allocates size bytes and returns a pointer to the allocated memory. The memory is not cleared. void free(void *ptr); free() frees the memory space pointed to by ptr, which must have been returned by a previous call to malloc(), calloc() or realloc(). Otherwise, or if free(ptr) has already been called before, undefined behaviour occurs. void *realloc(void *ptr, size_t size); realloc() changes the size of the memory block pointed to by ptr to size bytes. The contents will be unchanged to the minimum of the old and new sizes; newly allocated memory will be uninitialized. If ptr is NULL, the call is equivalent to malloc(size); if size is equal to zero, the call is equivalent to free(ptr). Unless ptr is NULL, it must have been returned by an earlier call to malloc(), calloc() or realloc(). void *calloc(size_t nmemb, size_t size); calloc() allocates memory for an array of nmemb elements of size bytes each and returns a pointer to the allocated memory. The memory is set to zero. ID3 #include bool mp3info(mp3entry *entry, char *filename); Return FALSE if successful. The given mp3entry is then filled in with whatever id3 info it could find about the given file. Various #include void kernel_init(void) Inits the kernel and starts the tick interrupt void sleep(ticks) Sleep a specified number of ticks, we have HZ ticks per second. void yield(void) Let another thread run. This should be used as soon as you have to "wait" for something or similar, and also if you do anything that takes "a long time". This function is the entire foundation that our "cooperative multitasking" is based on. Use it. int set_irq_level(int level) Sets the interrupt level (0 = lowest, 15 = highest) and returns the previous level. void queue_init(struct event_queue *q) Initialize an event queue. The maximum number of events in a queue is QUEUE_LENGTH-1. void queue_wait(struct event_queue *q, struct event *ev) Receive an event in a queue, blocking the thread if the queue is empty. void queue_post(struct event_queue *q, int id, void *data) Post an event to a queue. NOTE: Negative event ID's are for system use only!!! bool queue_empty(struct event_queue* q) Returns true if the queue is empty. int queue_broadcast(int id, void *data) Posts an event in all queues that has been initiated with queue_init(). Returns the number of queues that were posted to. int tick_add_task(void (*f)(void)) Add a task to the tick task queue. The argument is a pointer to a function that will be called every tick interrupt. At most MAX_NUM_TICK_TASKS can be active at the same time. int tick_remove_task(void (*f)(void)) Remove a task from the task queue. void mutex_init(struct mutex *m) Initialize a mutex. void mutex_lock(struct mutex *m) Lock a mutex. This will block the thread if the mutex is already locked. Note that you will geta deadlock if you lock the mutex twice! void mutex_unlock(struct mutex *m) Unlock a mutex.