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added scrollUP() to automatically scroll a display when println() is used #129

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added scrollUP() to automatically scroll a display when println() is used #129

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190651e
- initial fork and push
psionprime Jan 12, 2019
b964f2e
- modified comments due to build fail "not documented"
psionprime Jan 21, 2019
e1120f2
- build failing due to documentaion issues
psionprime Jan 21, 2019
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25 changes: 25 additions & 0 deletions Adafruit_SSD1306.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1099,3 +1099,28 @@ void Adafruit_SSD1306::dim(boolean dim) {
TRANSACTION_END
}


/**************************************************************************/
/*!
@brief Scroll display up one line, reseting cursor y to print at bottom
*/
/**************************************************************************/
void Adafruit_SSD1306::scrollUp(void) {
/*
* - supporting oled 128x32 pixel display so know width
* -- a row of pixels 128 columns x 8 down is 8 * 16, left to right
*/

// copy 2nd to last line from buffer to top of scroll buffer; (char pixel width with 8 as base size of 1) * (total pixel width / 8 as that is how this display is addressed) * (lines)
int intLineSize = ((textsize * SSD1306_PIXEL_CHUNK) * (WIDTH / SSD1306_PIXEL_CHUNK));
memcpy(buffer, buffer + intLineSize, SSD1306_BUFF_SIZE - intLineSize);

// clear buffer last line; (char pixel width with 8 as base size of 1) * (total pixel width / 8 as that is how this display is addressed) * (font size for height * lines)
int intOffsetLastLine = intLineSize * 3;
memset(buffer + intOffsetLastLine, 0, SSD1306_BUFF_SIZE - intOffsetLastLine);

setCursor(cursor_x, (textsize * SSD1306_PIXEL_CHUNK) * 3);

}


8 changes: 7 additions & 1 deletion Adafruit_SSD1306.h
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Expand Up @@ -102,13 +102,15 @@
#if defined SSD1306_128_32
#define SSD1306_LCDWIDTH 128 ///< DEPRECATED: width w/SSD1306_128_32 defined
#define SSD1306_LCDHEIGHT 32 ///< DEPRECATED: height w/SSD1306_128_32 defined
#define SSD1306_PIXEL_CHUNK 8 ///< for scrollUP(); 8 bit "pages"; see datasheet
#define SSD1306_BUFF_SIZE (128 * ((32 + 7) / 8)) ///< for scrollUP()
#endif
#if defined SSD1306_96_16
#define SSD1306_LCDWIDTH 96 ///< DEPRECATED: width w/SSD1306_96_16 defined
#define SSD1306_LCDHEIGHT 16 ///< DEPRECATED: height w/SSD1306_96_16 defined
#endif

/*!
/*!
@brief Class that stores state and functions for interacting with
SSD1306 OLED displays.
*/
Expand Down Expand Up @@ -149,6 +151,10 @@ class Adafruit_SSD1306 : public Adafruit_GFX {
boolean getPixel(int16_t x, int16_t y);
uint8_t *getBuffer(void);

// adding function to scroll display up a line; for use with println
void scrollUp(void); // scroll display up one line of text


private:
inline void SPIwrite(uint8_t d) __attribute__((always_inline));
void drawFastHLineInternal(int16_t x, int16_t y, int16_t w,
Expand Down