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drivers: display: Enhance BBC micro:bit string output capabilities

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Add a new mb_display_print() API which takes printf-style parameters
and outputs scrolling text instead of one character at a time. The
existing mb_display_str() API is renamed to mb_display_string() for
consistency, and now also takes printf-style parameters.

Change-Id: I59c42bcd74c62f05ecb6d097dc808b9e5c1984c5
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
This commit is contained in:
Johan Hedberg 2017-04-04 13:01:22 +03:00
commit 7e5df0cc02
5 changed files with 177 additions and 36 deletions
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26
include/display/mb_display.h
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@ -17,6 +17,7 @@
* @{
*/
#include <stdio.h>
#include <stdint.h>
#include <misc/util.h>
@ -110,11 +111,32 @@ void mb_display_char(struct mb_display *disp, char chr, int32_t duration);
/**
* @brief Display a string of characters on the BBC micro:bit LED display.
*
* This function takes a printf-style format string and outputs it one
* character at a time to the display. For scrolling-based string output
* see the mb_display_print() API.
*
* @param disp Display object.
* @param str String to display.
* @param duration Duration how long to show each character (in milliseconds).
* @param fmt printf-style format string.
* @param ... Optional list of format arguments.
*/
void mb_display_str(struct mb_display *disp, const char *str, int32_t duration);
__printf_like(3, 4) void mb_display_string(struct mb_display *disp,
int32_t duration,
const char *fmt, ...);
/**
* @brief Print a string of characters on the BBC micro:bit LED display.
*
* This function takes a printf-style format string and outputs it in a
* scrolling fashion to the display. For character-by-character output
* instead of scrolling, see the mb_display_string() API.
*
* @param disp Display object.
* @param fmt printf-style format string
* @param ... Optional list of format arguments.
*/
__printf_like(2, 3) void mb_display_print(struct mb_display *disp,
const char *fmt, ...);
/**
* @brief Stop the ongoing display of an image.