Library for Adafruit SHARP Memory Displays. This is a port of the original Arduino library available at: https://github.com/adafruit/Adafruit_SHARP_Memory_Display .
Dependents: Adafruit_SHARP_Memory_Display_demo Analog_Clock
Library for Adafruit Sharp Memory Displays. A demo is available here: https://developer.mbed.org/users/marcpl/code/Adafruit_SHARP_Memory_Display_demo/
Adafruit_SharpMem.cpp
- Committer:
- marcpl
- Date:
- 2015-06-23
- Revision:
- 0:070c76a8d782
- Child:
- 3:99cc0e72e165
File content as of revision 0:070c76a8d782:
/********************************************************************* This is an Arduino library for our Monochrome SHARP Memory Displays Pick one up today in the adafruit shop! ------> http://www.adafruit.com/products/1393 These displays use SPI to communicate, 3 pins are required to interface Adafruit invests time and resources providing this open source code, please support Adafruit and open-source hardware by purchasing products from Adafruit! Written by Limor Fried/Ladyada for Adafruit Industries. BSD license, check license.txt for more information All text above, and the splash screen must be included in any redistribution *********************************************************************/ /* * Modified by Marc PLOUHINEC 23/06/2015 for use in mbed */ #include "Adafruit_SharpMem.h" /************************************************************************** Sharp Memory Display Connector ----------------------------------------------------------------------- Pin Function Notes === ============== =============================== 1 VIN 3.3-5.0V (into LDO supply) 2 3V3 3.3V out 3 GND 4 SCLK Serial Clock 5 MOSI Serial Data Input 6 CS Serial Chip Select 9 EXTMODE COM Inversion Select (Low = SW clock/serial) 7 EXTCOMIN External COM Inversion Signal 8 DISP Display On(High)/Off(Low) **************************************************************************/ #define SHARPMEM_BIT_WRITECMD (0x80) #define SHARPMEM_BIT_VCOM (0x40) #define SHARPMEM_BIT_CLEAR (0x20) #define TOGGLE_VCOM do { _sharpmem_vcom = _sharpmem_vcom ? 0x00 : SHARPMEM_BIT_VCOM; } while(0); uint8_t sharpmem_buffer[(SHARPMEM_LCDWIDTH * SHARPMEM_LCDHEIGHT) / 8]; /* ************* */ /* CONSTRUCTORS */ /* ************* */ Adafruit_SharpMem::Adafruit_SharpMem(PinName enable, PinName cs, PinName mosi, PinName miso_unused, PinName sclk, PinName _unused) : Adafruit_GFX(SHARPMEM_LCDWIDTH, SHARPMEM_LCDHEIGHT), spi(mosi, miso_unused, sclk, _unused), displayEnable(enable, 0), chipSelect(cs, 0), _sharpmem_vcom(SHARPMEM_BIT_VCOM) { spi.frequency(1000000); spi.format(8, 0); } void Adafruit_SharpMem::begin() { setRotation(2); } /* ************** */ /* PUBLIC METHODS */ /* ************** */ // 1<<n is a costly operation on AVR -- table usu. smaller & faster static const uint8_t set[] = { 1, 2, 4, 8, 16, 32, 64, 128 }, clr[] = { ~1, ~2, ~4, ~8, ~16, ~32, ~64, ~128 }; /**************************************************************************/ /*! @brief Draws a single pixel in image buffer @param[in] x The x position (0 based) @param[in] y The y position (0 based) */ /**************************************************************************/ void Adafruit_SharpMem::drawPixel(int16_t x, int16_t y, uint16_t color) { if((x < 0) || (x >= _width) || (y < 0) || (y >= _height)) return; switch(rotation) { case 1: swap(x, y); x = _rawWidth - 1 - x; break; case 2: x = _rawWidth - 1 - x; y = _rawHeight - 1 - y; break; case 3: swap(x, y); y = _rawHeight - 1 - y; break; } if(color) { sharpmem_buffer[(y*SHARPMEM_LCDWIDTH + x) / 8] |= set[x & 7]; } else { sharpmem_buffer[(y*SHARPMEM_LCDWIDTH + x) / 8] &= clr[x & 7]; } } /**************************************************************************/ /*! @brief Gets the value (1 or 0) of the specified pixel from the buffer @param[in] x The x position (0 based) @param[in] y The y position (0 based) @return 1 if the pixel is enabled, 0 if disabled */ /**************************************************************************/ uint8_t Adafruit_SharpMem::getPixel(uint16_t x, uint16_t y) { if((x >= _width) || (y >= _height)) return 0; // <0 test not needed, unsigned switch(rotation) { case 1: swap(x, y); x = _rawWidth - 1 - x; break; case 2: x = _rawWidth - 1 - x; y = _rawHeight - 1 - y; break; case 3: swap(x, y); y = _rawHeight - 1 - y; break; } return sharpmem_buffer[(y*SHARPMEM_LCDWIDTH + x) / 8] & set[x & 7] ? 1 : 0; } /**************************************************************************/ /*! @brief Clears the screen */ /**************************************************************************/ void Adafruit_SharpMem::clearDisplay() { memset(sharpmem_buffer, 0xff, (SHARPMEM_LCDWIDTH * SHARPMEM_LCDHEIGHT) / 8); // Send the clear screen command rather than doing a HW refresh (quicker) chipSelect = 1; spi.write(_sharpmem_vcom | SHARPMEM_BIT_CLEAR); spi.write(0x00); TOGGLE_VCOM; chipSelect = 0; } /**************************************************************************/ /*! @brief Renders the contents of the pixel buffer on the LCD */ /**************************************************************************/ void Adafruit_SharpMem::refresh(void) { uint16_t i, totalbytes, currentline, oldline; totalbytes = (SHARPMEM_LCDWIDTH * SHARPMEM_LCDHEIGHT) / 8; // Send the write command chipSelect = 1; spi.write(SHARPMEM_BIT_WRITECMD | _sharpmem_vcom); TOGGLE_VCOM; // Send the address for line 1 oldline = currentline = 1; spi.write(bitReverse8(currentline)); // Send image buffer for (i=0; i<totalbytes; i++) { spi.write(bitReverse8(sharpmem_buffer[i])); currentline = ((i+1)/(SHARPMEM_LCDWIDTH/8)) + 1; if(currentline != oldline) { // Send end of line and address bytes spi.write(0x00); if (currentline <= SHARPMEM_LCDHEIGHT) { spi.write(bitReverse8(currentline)); } oldline = currentline; } } // Send another trailing 8 bits for the last line spi.write(0x00); chipSelect = 0; } /**************************************************************************/ /*! @brief Turn on the screen */ /**************************************************************************/ void Adafruit_SharpMem::enableDisplay() { displayEnable = 1; } /**************************************************************************/ /*! @brief Turn off the screen */ /**************************************************************************/ void Adafruit_SharpMem::disableDisplay() { displayEnable = 0; }