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nuttx/drivers/lcd/ssd1306.c
Gregory Nutt 09faaccc02 Created new directories to hold SPI-related files
2013-07-01 08:11:54 -06:00

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/**************************************************************************************
* drivers/lcd/ssd1306.c
* Driver for Univision UG-2864HSWEG01 OLED display or UG-2832HSWEG04 both with the
* Univision SSD1306 controller in SPI mode
*
* Copyright (C) 2012-2013 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* References:
* 1. Product Specification (Preliminary), Part Name: OEL Display Module, Part ID:
* UG-2864HSWEG01, Doc No: SAS1-9046-B, Univision Technology Inc.
* 2. Product Specification, Part Name: OEL Display Module, Part ID: UG-2832HSWEG04,
* Doc No.: SAS1-B020-B, Univision Technology Inc.
* 3. SSD1306, 128 X 64 Dot Matrix OLED/PLED, Preliminary Segment/Common Driver with
* Controller, Solomon Systech
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
**************************************************************************************/
/**************************************************************************************
* Device memory organization:
*
* +----------------------------+
* | Column |
* --------+----+---+---+---+-...-+-----+
* Page | 0 | 1 | 2 | 3 | ... | 127 |
* --------+----+---+---+---+-...-+-----+
* Page 0 | D0 | X | | | | |
* | D1 | X | | | | |
* | D2 | X | | | | |
* | D3 | X | | | | |
* | D4 | X | | | | |
* | D5 | X | | | | |
* | D6 | X | | | | |
* | D7 | X | | | | |
* --------+----+---+---+---+-...-+-----+
* Page 1 | | | | | | |
* --------+----+---+---+---+-...-+-----+
* Page 2 | | | | | | |
* --------+----+---+---+---+-...-+-----+
* Page 3 | | | | | | |
* --------+----+---+---+---+-...-+-----+
* Page 4 | | | | | | |
* --------+----+---+---+---+-...-+-----+
* Page 5 | | | | | | |
* --------+----+---+---+---+-...-+-----+
* Page 6 | | | | | | |
* --------+----+---+---+---+-...-+-----+
* Page 7 | | | | | | |
* --------+----+---+---+---+-...-+-----+
*
* -----------------------------------+---------------------------------------
* Landscape Display: | Reverse Landscape Display:
* --------+-----------------------+ | --------+---------------------------+
* | Column | | | Column |
* --------+---+---+---+-...-+-----+ | --------+-----+-----+-----+-...-+---+
* Page 0 | 0 | 1 | 2 | | 127 | | Page 7 | 127 | 126 | 125 | | 0 |
* --------+---+---+---+-...-+-----+ | --------+-----+-----+-----+-...-+---+
* Page 1 | V | | Page 6 | ^ |
* --------+---+---+---+-...-+-----+ | --------+-----+-----+-----+-...-+---+
* Page 2 | V | | Page 5 | ^ |
* --------+---+---+---+-...-+-----+ | --------+-----+-----+-----+-...-+---+
* Page 3 | V | | Page 4 | ^ |
* --------+---+---+---+-...-+-----+ | --------+-----+-----+-----+-...-+---+
* Page 4 | V | | Page 3 | ^ |
* --------+---+---+---+-...-+-----+ | --------+-----+-----+-----+-...-+---+
* Page 5 | V | | Page 2 | ^ |
* --------+---+---+---+-...-+-----+ | --------+-----+-----+-----+-...-+---+
* Page 6 | V | | Page 1 | ^ |
* --------+---+---+---+-...-+-----+ | --------+-----+-----+-----+-...-+---+
* Page 7 | V | | Page 0 | ^ |
* --------+---+---+---+-...-+-----+ | --------+-----+-----+-----+-...-+---+
* -----------------------------------+---------------------------------------
*
* -----------------------------------+---------------------------------------
* Portrait Display: | Reverse Portrait Display:
* -----------+---------------------+ | -----------+---------------------+
* | Page | | | Page |
* -----------+---+---+---+-...-+---+ | -----------+---+---+---+-...-+---+
* Column 0 | 0 | 1 | 2 | | 7 | | Column 127 | 7 | 6 | 5 | | 0 |
* -----------+---+---+---+-...-+---+ | -----------+---+---+---+-...-+---+
* Column 1 | > > > > > | | Column 126 | |
* -----------+---+---+---+-...-+---+ | -----------+---+---+---+-...-+---+
* Column 2 | | | Column 125 | |
* -----------+---+---+---+-...-+---+ | -----------+---+---+---+-...-+---+
* ... | | | ... | |
* -----------+---+---+---+-...-+---+ | -----------+---+---+---+-...-+---+
* Column 127 | | | Column 0 | < < < < < |
* -----------+---+---+---+-...-+---+ | -----------+---+---+---+-...-+---+
* -----------------------------------+----------------------------------------
**************************************************************************************/
/**************************************************************************************
* Included Files
**************************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/arch.h>
#include <nuttx/spi/spi.h>
#include <nuttx/lcd/lcd.h>
#include <nuttx/lcd/ssd1306.h>
#include <arch/irq.h>
#ifdef CONFIG_LCD_SSD1306
/**************************************************************************************
* Pre-processor Definitions
**************************************************************************************/
/* Configuration **********************************************************************/
/* Limitations of the current configuration that I hope to fix someday */
#ifndef CONFIG_SSD1306_NINTERFACES
# define CONFIG_SSD1306_NINTERFACES 1
#endif
#if CONFIG_SSD1306_NINTERFACES != 1
# warning "This implementation supports only a single SSD1306 device"
# undef CONFIG_SSD1306_NINTERFACES
# define CONFIG_SSD1306_NINTERFACES 1
#endif
#if !defined(CONFIG_LCD_UG2864HSWEG01) && !defined(CONFIG_LCD_UG2832HSWEG04)
# error "Unknown and unsupported SSD1306 LCD"
#endif
#if defined(CONFIG_LCD_PORTRAIT) || defined(CONFIG_LCD_RPORTRAIT)
# warning "No support for portrait modes"
# undef CONFIG_LCD_LANDSCAPE
# define CONFIG_LCD_LANDSCAPE 1
# undef CONFIG_LCD_PORTRAIT
# undef CONFIG_LCD_RLANDSCAPE
# undef CONFIG_LCD_RPORTRAIT
#endif
/* SSD1306 Commands *******************************************************************/
#define SSD1306_SETCOLL(ad) (0x00 | ((ad) & 0x0f)) /* Set Lower Column Address: (00h - 0fh) */
#define SSD1306_SETCOLH(ad) (0x10 | ((ad) & 0x0f)) /* Set Higher Column Address: (10h - 1fh) */
#define SSD1306_STARTLINE(ln) (0x40 | ((ln) & 0x3f)) /* Set Display Start Line: (40h - 7fh) */
#define SSD1306_CONTRAST_MODE (0x81) /* Set Contrast Control Register: (Double Bytes Command) */
# define SSD1306_CONTRAST(c) (c)
#define SSD1306_SEGREMAP(m) (0xa0 | ((m) & 0x01)) /* Set Segment Re-map: (a0h - a1h) */
# define SSD1306_REMAPRIGHT SSD1306_SEGREMAP(0) /* Right rotation */
# define SSD1306_REMAPPLEFT SSD1306_SEGREMAP(1) /* Left rotation */
#define SSD1306_EDISPOFFON(s) (0xa4 | ((s) & 0x01)) /* Set Entire Display OFF/ON: (a4h - a5h) */
# define SSD1306_EDISPOFF SSD1306_EDISPOFFON(0) /* Display off */
# define SSD1306_EDISPON SSD1306_EDISPOFFON(1) /* Display on */
#define SSD1306_NORMREV(s) (0xa6 | ((s) & 0x01)) /* Set Normal/Reverse Display: (a6h -a7h) */
# define SSD1306_NORMAL SSD1306_NORMREV(0) /* Normal display */
# define SSD1306_REVERSE SSD1306_NORMREV(1) /* Reverse display */
#define SSD1306_MRATIO_MODE (0xa8) /* Set Multiplex Ration: (Double Bytes Command) */
# define SSD1306_MRATIO(d) ((d) & 0x3f)
#define SSD1306_DCDC_MODE (0xad) /* Set DC-DC OFF/ON: (Double Bytes Command) */
# define SSD1306_DCDC_OFF (0x8a)
# define SSD1306_DCDC_ON (0x8b)
#define SSD1306_DISPOFFON(s) (0xae | ((s) & 0x01)) /* Display OFF/ON: (aeh - afh) */
# define SSD1306_DISPOFF SSD1306_DISPOFFON(0) /* Display off */
# define SSD1306_DISPON SSD1306_DISPOFFON(1) /* Display on */
#define SSD1306_PAGEADDR(a) (0xb0 | ((a) & 0x0f)) /* Set Page Address: (b0h - b7h) */
#define SSD1306_SCANDIR(d) (0xc0 | ((d) & 0x08)) /* Set Common Output Scan Direction: (c0h - c8h) */
# define SSD1306_SCANFROMCOM0 SSD1306_SCANDIR(0x00) /* Scan from COM[0] to COM[n-1]*/
# define SSD1306_SCANTOCOM0 SSD1306_SCANDIR(0x08) /* Scan from COM[n-1] to COM[0] */
#define SSD1306_DISPOFFS_MODE (0xd3) /* Set Display Offset: (Double Bytes Command) */
# define SSD1306_DISPOFFS(o) ((o) & 0x3f)
#define SSD1306_CLKDIV_SET (0xd5) /* Set Display Clock Divide Ratio/Oscillator Frequency: (Double Bytes Command) */
# define SSD1306_CLKDIV(f,d) ((((f) & 0x0f) << 4) | ((d) & 0x0f))
#define SSD1306_CHRGPER_SET (0xd9) /* Set Dis-charge/Pre-charge Period: (Double Bytes Command) */
# define SSD1306_CHRGPER(d,p) ((((d) & 0x0f) << 4) | ((p) & 0x0f))
#define SSD1306_CMNPAD_CONFIG (0xda) /* Set Common pads hardware configuration: (Double Bytes Command) */
# define SSD1306_CMNPAD(c) ((0x02) | ((c) & 0x10))
#define SSD1306_VCOM_SET (0xdb) /* Set VCOM Deselect Level: (Double Byte Command) */
# define SSD1306_VCOM(v) (v)
#define SSD1306_CHRPUMP_SET (0x8d) /* Charge Pump Setting */
# define SSD1306_CHRPUMP_ON (0x14)
# define SSD1306_CHRPUMP_OFF (0x10)
#define SSD1306_RMWSTART (0xe0) /* Read-Modify-Write: (e0h) */
#define SSD1306_NOP (0xe3) /* NOP: (e3h) */
#define SSD1306_END (0xee) /* End: (eeh) */
#define SSD1306_WRDATA(d) (d) /* Write Display Data */
#define SSD1306_STATUS_BUSY (0x80) /* Read Status */
#define SSD1306_STATUS_ONOFF (0x40)
#define SSD1306_RDDATA(d) (d) /* Read Display Data */
/* Color Properties *******************************************************************/
/* Display Resolution
*
* The SSD1306 display controller can handle a resolution of 132x64. The UG-2864HSWEG01
* on the base board is 128x64; the UG-2832HSWEG04 is 128x32.
*/
#if defined(CONFIG_LCD_UG2864HSWEG01)
# define SSD1306_DEV_NATIVE_XRES 128 /* Only 128 of 131 columns used */
# define SSD1306_DEV_NATIVE_YRES 64 /* 8 pages each 8 rows */
# define SSD1306_DEV_XOFFSET 2 /* Offset to logical column 0 */
# define SSD1306_DEV_PAGES 8 /* 8 pages */
# define SSD1306_DEV_CMNPAD 0x12 /* COM configuration */
#elif defined(CONFIG_LCD_UG2832HSWEG04)
# define SSD1306_DEV_NATIVE_XRES 128 /* Only 128 of 131 columns used */
# define SSD1306_DEV_NATIVE_YRES 32 /* 4 pages each 8 rows */
# define SSD1306_DEV_XOFFSET 2 /* Offset to logical column 0 */
# define SSD1306_DEV_PAGES 4 /* 4 pages */
# define SSD1306_DEV_CMNPAD 0x02 /* COM configuration */
#endif
#if defined(CONFIG_LCD_LANDSCAPE) || defined(CONFIG_LCD_RLANDSCAPE)
# define SSD1306_DEV_XRES SSD1306_DEV_NATIVE_XRES
# define SSD1306_DEV_YRES SSD1306_DEV_NATIVE_YRES
#else
# define SSD1306_DEV_XRES SSD1306_DEV_NATIVE_YRES
# define SSD1306_DEV_YRES SSD1306_DEV_NATIVE_XRES
#endif
#define SSD1306_DEV_DUTY (SSD1306_DEV_NATIVE_YRES-1)
/* Bytes per logical row and actual device row */
#define SSD1306_DEV_XSTRIDE (SSD1306_DEV_XRES >> 3)
#define SSD1306_DEV_YSTRIDE (SSD1306_DEV_YRES >> 3)
/* Color depth and format */
#define SSD1306_DEV_BPP 1
#define SSD1306_DEV_COLORFMT FB_FMT_Y1
/* Default contrast */
#define SSD1306_DEV_CONTRAST (128)
/* The size of the shadow frame buffer or one row buffer.
*
* Frame buffer size: 128 columns x 64 rows / 8 bits-per-pixel
* Row size: 128 columns x 8 rows-per-page / 8 bits-per-pixel
*/
#define SSD1306_DEV_FBSIZE (SSD1306_DEV_XSTRIDE * SSD1306_DEV_YRES)
#define SSD1306_DEV_ROWSIZE (SSD1306_DEV_XSTRIDE)
/* Orientation. There seem to be device differences. */
#if defined(CONFIG_LCD_UG2864HSWEG01)
# if defined(CONFIG_LCD_LANDSCAPE)
# undef SSD1306_DEV_REVERSEX
# undef SSD1306_DEV_REVERSEY
# elif defined(CONFIG_LCD_RLANDSCAPE)
# define SSD1306_DEV_REVERSEX 1
# define SSD1306_DEV_REVERSEY 1
# endif
#elif defined(CONFIG_LCD_UG2832HSWEG04)
# if defined(CONFIG_LCD_LANDSCAPE)
# define SSD1306_DEV_REVERSEX 1
# undef SSD1306_DEV_REVERSEY
# elif defined(CONFIG_LCD_RLANDSCAPE)
# undef SSD1306_DEV_REVERSEX
# define SSD1306_DEV_REVERSEY 1
# endif
#endif
/* Bit helpers */
#define LS_BIT (1 << 0)
#define MS_BIT (1 << 7)
/* Debug ******************************************************************************/
#ifdef CONFIG_DEBUG_LCD
# define lcddbg(format, arg...) dbg(format, ##arg)
# define lcdvdbg(format, arg...) vdbg(format, ##arg)
#else
# define lcddbg(x...)
# define lcdvdbg(x...)
#endif
/**************************************************************************************
* Private Type Definition
**************************************************************************************/
/* This structure describes the state of this driver */
struct ssd1306_dev_s
{
struct lcd_dev_s dev; /* Publically visible device structure */
/* Private LCD-specific information follows */
FAR struct spi_dev_s *spi; /* Cached SPI device reference */
uint8_t contrast; /* Current contrast setting */
bool on; /* true: display is on */
/* The SSD1306 does not support reading from the display memory in SPI mode.
* Since there is 1 BPP and access is byte-by-byte, it is necessary to keep
* a shadow copy of the framebuffer memory. At 128x64, this amounts to 1KB.
*/
uint8_t fb[SSD1306_DEV_FBSIZE];
};
/**************************************************************************************
* Private Function Protototypes
**************************************************************************************/
/* Low-level SPI helpers */
#ifdef CONFIG_SPI_OWNBUS
static inline void ssd1306_configspi(FAR struct spi_dev_s *spi);
# define ssd1306_lock(spi)
# define ssd1306_unlock(spi)
#else
# define ssd1306_configspi(spi)
static void ssd1306_lock(FAR struct spi_dev_s *spi);
static void ssd1306_unlock(FAR struct spi_dev_s *spi);
#endif
/* LCD Data Transfer Methods */
static int ssd1306_putrun(fb_coord_t row, fb_coord_t col,
FAR const uint8_t *buffer, size_t npixels);
static int ssd1306_getrun(fb_coord_t row, fb_coord_t col, FAR uint8_t *buffer,
size_t npixels);
/* LCD Configuration */
static int ssd1306_getvideoinfo(FAR struct lcd_dev_s *dev,
FAR struct fb_videoinfo_s *vinfo);
static int ssd1306_getplaneinfo(FAR struct lcd_dev_s *dev, unsigned int planeno,
FAR struct lcd_planeinfo_s *pinfo);
/* LCD RGB Mapping */
#ifdef CONFIG_FB_CMAP
# error "RGB color mapping not supported by this driver"
#endif
/* Cursor Controls */
#ifdef CONFIG_FB_HWCURSOR
# error "Cursor control not supported by this driver"
#endif
/* LCD Specific Controls */
static int ssd1306_getpower(struct lcd_dev_s *dev);
static int ssd1306_setpower(struct lcd_dev_s *dev, int power);
static int ssd1306_getcontrast(struct lcd_dev_s *dev);
static int ssd1306_setcontrast(struct lcd_dev_s *dev, unsigned int contrast);
/**************************************************************************************
* Private Data
**************************************************************************************/
/* This is working memory allocated by the LCD driver for each LCD device
* and for each color plane. This memory will hold one raster line of data.
* The size of the allocated run buffer must therefore be at least
* (bpp * xres / 8). Actual alignment of the buffer must conform to the
* bitwidth of the underlying pixel type.
*
* If there are multiple planes, they may share the same working buffer
* because different planes will not be operate on concurrently. However,
* if there are multiple LCD devices, they must each have unique run buffers.
*/
static uint8_t g_runbuffer[SSD1306_DEV_ROWSIZE];
/* This structure describes the overall LCD video controller */
static const struct fb_videoinfo_s g_videoinfo =
{
.fmt = SSD1306_DEV_COLORFMT, /* Color format: RGB16-565: RRRR RGGG GGGB BBBB */
.xres = SSD1306_DEV_XRES, /* Horizontal resolution in pixel columns */
.yres = SSD1306_DEV_YRES, /* Vertical resolution in pixel rows */
.nplanes = 1, /* Number of color planes supported */
};
/* This is the standard, NuttX Plane information object */
static const struct lcd_planeinfo_s g_planeinfo =
{
.putrun = ssd1306_putrun, /* Put a run into LCD memory */
.getrun = ssd1306_getrun, /* Get a run from LCD memory */
.buffer = (uint8_t*)g_runbuffer, /* Run scratch buffer */
.bpp = SSD1306_DEV_BPP, /* Bits-per-pixel */
};
/* This is the OLED driver instance (only a single device is supported for now) */
static struct ssd1306_dev_s g_oleddev =
{
.dev =
{
/* LCD Configuration */
.getvideoinfo = ssd1306_getvideoinfo,
.getplaneinfo = ssd1306_getplaneinfo,
/* LCD RGB Mapping -- Not supported */
/* Cursor Controls -- Not supported */
/* LCD Specific Controls */
.getpower = ssd1306_getpower,
.setpower = ssd1306_setpower,
.getcontrast = ssd1306_getcontrast,
.setcontrast = ssd1306_setcontrast,
},
};
/**************************************************************************************
* Private Functions
**************************************************************************************/
/**************************************************************************************
* Name: ssd1306_configspi
*
* Description:
* Configure the SPI for use with the UG-2864HSWEG01
*
* Input Parameters:
* spi - Reference to the SPI driver structure
*
* Returned Value:
* None
*
* Assumptions:
*
**************************************************************************************/
#ifdef CONFIG_SPI_OWNBUS
static inline void ssd1306_configspi(FAR struct spi_dev_s *spi)
{
lcdvdbg("Mode: %d Bits: 8 Frequency: %d\n",
CONFIG_SSD1306_SPIMODE, CONFIG_SSD1306_FREQUENCY);
/* Configure SPI for the UG-2864HSWEG01. But only if we own the SPI bus. Otherwise,
* don't bother because it might change.
*/
SPI_SETMODE(spi, CONFIG_SSD1306_SPIMODE);
SPI_SETBITS(spi, 8);
SPI_SETFREQUENCY(spi, CONFIG_SSD1306_FREQUENCY);
}
#endif
/**************************************************************************************
* Name: ssd1306_lock
*
* Description:
* Select the SPI, locking and re-configuring if necessary
*
* Input Parameters:
* spi - Reference to the SPI driver structure
*
* Returned Value:
* None
*
* Assumptions:
*
**************************************************************************************/
#ifndef CONFIG_SPI_OWNBUS
static inline void ssd1306_lock(FAR struct spi_dev_s *spi)
{
/* Lock the SPI bus if there are multiple devices competing for the SPI bus. */
SPI_LOCK(spi, true);
/* Now make sure that the SPI bus is configured for the UG-2864HSWEG01 (it
* might have gotten configured for a different device while unlocked)
*/
SPI_SETMODE(spi, CONFIG_SSD1306_SPIMODE);
SPI_SETBITS(spi, 8);
SPI_SETFREQUENCY(spi, CONFIG_SSD1306_FREQUENCY);
}
#endif
/**************************************************************************************
* Name: ssd1306_unlock
*
* Description:
* De-select the SPI
*
* Input Parameters:
* spi - Reference to the SPI driver structure
*
* Returned Value:
* None
*
* Assumptions:
*
**************************************************************************************/
#ifndef CONFIG_SPI_OWNBUS
static inline void ssd1306_unlock(FAR struct spi_dev_s *spi)
{
/* De-select UG-2864HSWEG01 chip and relinquish the SPI bus. */
SPI_LOCK(spi, false);
}
#endif
/**************************************************************************************
* Name: ssd1306_putrun
*
* Description:
* This method can be used to write a partial raster line to the LCD.
*
* Input Parameters:
* row - Starting row to write to (range: 0 <= row < yres)
* col - Starting column to write to (range: 0 <= col <= xres-npixels)
* buffer - The buffer containing the run to be written to the LCD
* npixels - The number of pixels to write to the LCD
* (range: 0 < npixels <= xres-col)
*
**************************************************************************************/
#if defined(CONFIG_LCD_LANDSCAPE) || defined(CONFIG_LCD_RLANDSCAPE)
static int ssd1306_putrun(fb_coord_t row, fb_coord_t col, FAR const uint8_t *buffer,
size_t npixels)
{
/* Because of this line of code, we will only be able to support a single UG device */
FAR struct ssd1306_dev_s *priv = (FAR struct ssd1306_dev_s *)&g_oleddev;
FAR uint8_t *fbptr;
FAR uint8_t *ptr;
uint8_t devcol;
uint8_t fbmask;
uint8_t page;
uint8_t usrmask;
int pixlen;
uint8_t i;
lcdvdbg("row: %d col: %d npixels: %d\n", row, col, npixels);
DEBUGASSERT(buffer);
/* Clip the run to the display */
pixlen = npixels;
if ((unsigned int)col + (unsigned int)pixlen > (unsigned int)SSD1306_DEV_XRES)
{
pixlen = (int)SSD1306_DEV_XRES - (int)col;
}
/* Verify that some portion of the run remains on the display */
if (pixlen <= 0 || row > SSD1306_DEV_YRES)
{
return OK;
}
/* Perform coordinate conversion for reverse landscape mode.
* If the rows are reversed then rows are are a mirror reflection of
* top to bottom.
*/
#ifdef SSD1306_DEV_REVERSEY
row = (SSD1306_DEV_YRES-1) - row;
#endif
/* If the column is switched then the start of the run is the mirror of
* the end of the run.
*
* col+pixlen-1
* col |
* 0 | | XRES
* . S>>>>>>E .
* . E<<<<<<S .
* | |
* | `-(XRES-1)-col
* ` (XRES-1)-col-(pixlen-1)
*/
#ifdef SSD1306_DEV_REVERSEX
col = (SSD1306_DEV_XRES-1) - col;
col -= (pixlen - 1);
#endif
/* Get the page number. The range of 64 lines is divided up into eight
* pages of 8 lines each.
*/
page = row >> 3;
/* Update the shadow frame buffer memory. First determine the pixel
* position in the frame buffer memory. Pixels are organized like
* this:
*
* --------+---+---+---+---+-...-+-----+
* Segment | 0 | 1 | 2 | 3 | ... | 131 |
* --------+---+---+---+---+-...-+-----+
* D0 | | X | | | | |
* D1 | | X | | | | |
* D2 | | X | | | | |
* D3 | | X | | | | |
* D4 | | X | | | | |
* D5 | | X | | | | |
* D6 | | X | | | | |
* D7 | | X | | | | |
* --------+---+---+---+---+-...-+-----+
*
* So, in order to draw a white, horizontal line, at row 45. we
* would have to modify all of the bytes in page 45/8 = 5. We
* would have to set bit 45%8 = 5 in every byte in the page.
*/
fbmask = 1 << (row & 7);
fbptr = &priv->fb[page * SSD1306_DEV_XRES + col];
#ifdef SSD1306_DEV_REVERSEX
ptr = fbptr + (pixlen - 1);
#else
ptr = fbptr;
#endif
#ifdef CONFIG_NX_PACKEDMSFIRST
usrmask = MS_BIT;
#else
usrmask = LS_BIT;
#endif
for (i = 0; i < pixlen; i++)
{
/* Set or clear the corresponding bit */
#ifdef SSD1306_DEV_REVERSEX
if ((*buffer & usrmask) != 0)
{
*ptr-- |= fbmask;
}
else
{
*ptr-- &= ~fbmask;
}
#else
if ((*buffer & usrmask) != 0)
{
*ptr++ |= fbmask;
}
else
{
*ptr++ &= ~fbmask;
}
#endif
/* Inc/Decrement to the next source pixel */
#ifdef CONFIG_NX_PACKEDMSFIRST
if (usrmask == LS_BIT)
{
buffer++;
usrmask = MS_BIT;
}
else
{
usrmask >>= 1;
}
#else
if (usrmask == MS_BIT)
{
buffer++;
usrmask = LS_BIT;
}
else
{
usrmask <<= 1;
}
#endif
}
/* Offset the column position to account for smaller horizontal
* display range.
*/
devcol = col + SSD1306_DEV_XOFFSET;
/* Lock and select device */
ssd1306_lock(priv->spi);
SPI_SELECT(priv->spi, SPIDEV_DISPLAY, true);
/* Select command transfer */
SPI_CMDDATA(priv->spi, SPIDEV_DISPLAY, true);
/* Set the starting position for the run */
/* Set the column address to the XOFFSET value */
SPI_SEND(priv->spi, SSD1306_SETCOLL(devcol & 0x0f));
SPI_SEND(priv->spi, SSD1306_SETCOLH(devcol >> 4));
/* Set the page address */
SPI_SEND(priv->spi, SSD1306_PAGEADDR(page));
/* Select data transfer */
SPI_CMDDATA(priv->spi, SPIDEV_DISPLAY, false);
/* Then transfer all of the data */
(void)SPI_SNDBLOCK(priv->spi, fbptr, pixlen);
/* De-select and unlock the device */
SPI_SELECT(priv->spi, SPIDEV_DISPLAY, false);
ssd1306_unlock(priv->spi);
return OK;
}
#else
# error "Configuration not implemented"
#endif
/**************************************************************************************
* Name: ssd1306_getrun
*
* Description:
* This method can be used to read a partial raster line from the LCD.
*
* Description:
* This method can be used to write a partial raster line to the LCD.
*
* row - Starting row to read from (range: 0 <= row < yres)
* col - Starting column to read read (range: 0 <= col <= xres-npixels)
* buffer - The buffer in which to return the run read from the LCD
* npixels - The number of pixels to read from the LCD
* (range: 0 < npixels <= xres-col)
*
**************************************************************************************/
#if defined(CONFIG_LCD_LANDSCAPE) || defined(CONFIG_LCD_RLANDSCAPE)
static int ssd1306_getrun(fb_coord_t row, fb_coord_t col, FAR uint8_t *buffer,
size_t npixels)
{
/* Because of this line of code, we will only be able to support a single UG device */
FAR struct ssd1306_dev_s *priv = &g_oleddev;
FAR uint8_t *fbptr;
uint8_t page;
uint8_t fbmask;
uint8_t usrmask;
int pixlen;
uint8_t i;
lcdvdbg("row: %d col: %d npixels: %d\n", row, col, npixels);
DEBUGASSERT(buffer);
/* Clip the run to the display */
pixlen = npixels;
if ((unsigned int)col + (unsigned int)pixlen > (unsigned int)SSD1306_DEV_XRES)
{
pixlen = (int)SSD1306_DEV_XRES - (int)col;
}
/* Verify that some portion of the run is actually the display */
if (pixlen <= 0 || row > SSD1306_DEV_YRES)
{
return -EINVAL;
}
/* Perform coordinate conversion for reverse landscape mode.
* If the rows are reversed then rows are are a mirror reflection of
* top to bottom.
*/
#ifdef SSD1306_DEV_REVERSEY
row = (SSD1306_DEV_YRES-1) - row;
#endif
/* If the column is switched then the start of the run is the mirror of
* the end of the run.
*
* col+pixlen-1
* col |
* 0 | | XRES
* . S>>>>>>E .
* . E<<<<<<S .
* | |
* | `-(XRES-1)-col
* ` (XRES-1)-col-(pixlen-1)
*/
#ifdef SSD1306_DEV_REVERSEX
col = (SSD1306_DEV_XRES-1) - col;
#endif
/* Then transfer the display data from the shadow frame buffer memory */
/* Get the page number. The range of 64 lines is divided up into eight
* pages of 8 lines each.
*/
page = row >> 3;
/* Update the shadow frame buffer memory. First determine the pixel
* position in the frame buffer memory. Pixels are organized like
* this:
*
* --------+---+---+---+---+-...-+-----+
* Segment | 0 | 1 | 2 | 3 | ... | 131 |
* --------+---+---+---+---+-...-+-----+
* D0 | | X | | | | |
* D1 | | X | | | | |
* D2 | | X | | | | |
* D3 | | X | | | | |
* D4 | | X | | | | |
* D5 | | X | | | | |
* D6 | | X | | | | |
* D7 | | X | | | | |
* --------+---+---+---+---+-...-+-----+
*
* So, in order to draw a white, horizontal line, at row 45. we
* would have to modify all of the bytes in page 45/8 = 5. We
* would have to set bit 45%8 = 5 in every byte in the page.
*/
fbmask = 1 << (row & 7);
fbptr = &priv->fb[page * SSD1306_DEV_XRES + col];
#ifdef CONFIG_NX_PACKEDMSFIRST
usrmask = MS_BIT;
#else
usrmask = LS_BIT;
#endif
*buffer = 0;
for (i = 0; i < pixlen; i++)
{
/* Set or clear the corresponding bit */
#ifdef SSD1306_DEV_REVERSEX
uint8_t byte = *fbptr--;
#else
uint8_t byte = *fbptr++;
#endif
if ((byte & fbmask) != 0)
{
*buffer |= usrmask;
}
/* Inc/Decrement to the next destination pixel. Hmmmm. It looks like
* this logic could write past the end of the user buffer. Revisit
* this!
*/
#ifdef CONFIG_NX_PACKEDMSFIRST
if (usrmask == LS_BIT)
{
buffer++;
*buffer = 0;
usrmask = MS_BIT;
}
else
{
usrmask >>= 1;
}
#else
if (usrmask == MS_BIT)
{
buffer++;
*buffer = 0;
usrmask = LS_BIT;
}
else
{
usrmask <<= 1;
}
#endif
}
return OK;
}
#else
# error "Configuration not implemented"
#endif
/**************************************************************************************
* Name: ssd1306_getvideoinfo
*
* Description:
* Get information about the LCD video controller configuration.
*
**************************************************************************************/
static int ssd1306_getvideoinfo(FAR struct lcd_dev_s *dev,
FAR struct fb_videoinfo_s *vinfo)
{
DEBUGASSERT(dev && vinfo);
lcdvdbg("fmt: %d xres: %d yres: %d nplanes: %d\n",
g_videoinfo.fmt, g_videoinfo.xres, g_videoinfo.yres, g_videoinfo.nplanes);
memcpy(vinfo, &g_videoinfo, sizeof(struct fb_videoinfo_s));
return OK;
}
/**************************************************************************************
* Name: ssd1306_getplaneinfo
*
* Description:
* Get information about the configuration of each LCD color plane.
*
**************************************************************************************/
static int ssd1306_getplaneinfo(FAR struct lcd_dev_s *dev, unsigned int planeno,
FAR struct lcd_planeinfo_s *pinfo)
{
DEBUGASSERT(pinfo && planeno == 0);
lcdvdbg("planeno: %d bpp: %d\n", planeno, g_planeinfo.bpp);
memcpy(pinfo, &g_planeinfo, sizeof(struct lcd_planeinfo_s));
return OK;
}
/**************************************************************************************
* Name: ssd1306_getpower
*
* Description:
* Get the LCD panel power status (0: full off - CONFIG_LCD_MAXPOWER: full on. On
* backlit LCDs, this setting may correspond to the backlight setting.
*
**************************************************************************************/
static int ssd1306_getpower(FAR struct lcd_dev_s *dev)
{
FAR struct ssd1306_dev_s *priv = (FAR struct ssd1306_dev_s *)dev;
DEBUGASSERT(priv);
lcdvdbg("power: %s\n", priv->on ? "ON" : "OFF");
return priv->on ? CONFIG_LCD_MAXPOWER : 0;
}
/**************************************************************************************
* Name: ssd1306_setpower
*
* Description:
* Enable/disable LCD panel power (0: full off - CONFIG_LCD_MAXPOWER: full on). On
* backlit LCDs, this setting may correspond to the backlight setting.
*
**************************************************************************************/
static int ssd1306_setpower(FAR struct lcd_dev_s *dev, int power)
{
struct ssd1306_dev_s *priv = (struct ssd1306_dev_s *)dev;
DEBUGASSERT(priv && (unsigned)power <= CONFIG_LCD_MAXPOWER && priv->spi);
lcdvdbg("power: %d [%d]\n", power, priv->on ? CONFIG_LCD_MAXPOWER : 0);
/* Lock and select device */
ssd1306_lock(priv->spi);
SPI_SELECT(priv->spi, SPIDEV_DISPLAY, true);
if (power <= 0)
{
/* Turn the display off */
(void)SPI_SEND(priv->spi, SSD1306_DISPOFF);
priv->on = false;
}
else
{
/* Turn the display on */
(void)SPI_SEND(priv->spi, SSD1306_DISPON);
priv->on = true;
}
/* De-select and unlock the device */
SPI_SELECT(priv->spi, SPIDEV_DISPLAY, false);
ssd1306_unlock(priv->spi);
return OK;
}
/**************************************************************************************
* Name: ssd1306_getcontrast
*
* Description:
* Get the current contrast setting (0-CONFIG_LCD_MAXCONTRAST).
*
**************************************************************************************/
static int ssd1306_getcontrast(struct lcd_dev_s *dev)
{
struct ssd1306_dev_s *priv = (struct ssd1306_dev_s *)dev;
DEBUGASSERT(priv);
lcdvdbg("contrast: %d\n", priv->contrast);
return priv->contrast;
}
/**************************************************************************************
* Name: ssd1306_setcontrast
*
* Description:
* Set LCD panel contrast (0-CONFIG_LCD_MAXCONTRAST).
*
**************************************************************************************/
static int ssd1306_setcontrast(struct lcd_dev_s *dev, unsigned int contrast)
{
struct ssd1306_dev_s *priv = (struct ssd1306_dev_s *)dev;
unsigned int scaled;
lcdvdbg("contrast: %d\n", contrast);
DEBUGASSERT(priv);
/* Verify the contrast value */
#ifdef CONFIG_DEBUG
if (contrast > CONFIG_LCD_MAXCONTRAST)
{
return -EINVAL;
}
#endif
/* Scale contrast: newcontrast = 255 * contrast / CONFIG_LCD_MAXCONTRAST
* Where contrast is in the range {1,255}
*/
#if CONFIG_LCD_MAXCONTRAST != 255
scaled = ((contrast << 8) - 1) / CONFIG_LCD_MAXCONTRAST;
#else
scaled = contrast;
#endif
/* Lock and select device */
ssd1306_lock(priv->spi);
SPI_SELECT(priv->spi, SPIDEV_DISPLAY, true);
/* Select command transfer */
SPI_CMDDATA(priv->spi, SPIDEV_DISPLAY, true);
/* Set the contrast */
(void)SPI_SEND(priv->spi, SSD1306_CONTRAST_MODE); /* Set contrast control register */
(void)SPI_SEND(priv->spi, SSD1306_CONTRAST(scaled)); /* Data 1: Set 1 of 256 contrast steps */
priv->contrast = contrast;
/* De-select and unlock the device */
SPI_SELECT(priv->spi, SPIDEV_DISPLAY, false);
ssd1306_unlock(priv->spi);
return OK;
}
/**************************************************************************************
* Public Functions
**************************************************************************************/
/**************************************************************************************
* Name: ssd1306_initialize
*
* Description:
* Initialize the UG-2864HSWEG01 video hardware. The initial state of the
* OLED is fully initialized, display memory cleared, and the OLED ready
* to use, but with the power setting at 0 (full off == sleep mode).
*
* Input Parameters:
*
* spi - A reference to the SPI driver instance.
* devno - A value in the range of 0 through CONFIG_SSD1306_NINTERFACES-1.
* This allows support for multiple OLED devices.
*
* Returned Value:
*
* On success, this function returns a reference to the LCD object for
* the specified OLED. NULL is returned on any failure.
*
**************************************************************************************/
FAR struct lcd_dev_s *ssd1306_initialize(FAR struct spi_dev_s *spi, unsigned int devno)
{
FAR struct ssd1306_dev_s *priv = &g_oleddev;
lcdvdbg("Initializing\n");
DEBUGASSERT(spi && devno == 0);
/* Save the reference to the SPI device */
priv->spi = spi;
/* Configure the SPI */
ssd1306_configspi(spi);
/* Lock and select device */
ssd1306_lock(priv->spi);
SPI_SELECT(spi, SPIDEV_DISPLAY, true);
/* Select command transfer */
SPI_CMDDATA(spi, SPIDEV_DISPLAY, true);
/* Configure OLED SPI or I/O, must be delayed 1-10ms */
up_mdelay(5);
/* Configure the device */
SPI_SEND(spi, SSD1306_DISPOFF); /* Display off 0xae */
SPI_SEND(spi, SSD1306_SETCOLL(0)); /* Set lower column address 0x00 */
SPI_SEND(spi, SSD1306_SETCOLH(0)); /* Set higher column address 0x10 */
SPI_SEND(spi, SSD1306_STARTLINE(0)); /* Set display start line 0x40 */
/* SPI_SEND(spi, SSD1306_PAGEADDR(0));*//* Set page address (Can ignore)*/
SPI_SEND(spi, SSD1306_CONTRAST_MODE); /* Contrast control 0x81 */
SPI_SEND(spi ,SSD1306_CONTRAST(SSD1306_DEV_CONTRAST)); /* Default contrast 0xCF */
SPI_SEND(spi, SSD1306_REMAPPLEFT); /* Set segment remap left 95 to 0 | 0xa1 */
/* SPI_SEND(spi, SSD1306_EDISPOFF); */ /* Normal display off 0xa4 (Can ignore)*/
SPI_SEND(spi, SSD1306_NORMAL); /* Normal (un-reversed) display mode 0xa6 */
SPI_SEND(spi, SSD1306_MRATIO_MODE); /* Multiplex ratio 0xa8 */
SPI_SEND(spi, SSD1306_MRATIO(SSD1306_DEV_DUTY)); /* Duty = 1/64 or 1/32 */
/* SPI_SEND(spi, SSD1306_SCANTOCOM0);*/ /* Com scan direction: Scan from COM[n-1] to COM[0] (Can ignore)*/
SPI_SEND(spi, SSD1306_DISPOFFS_MODE); /* Set display offset 0xd3 */
SPI_SEND(spi, SSD1306_DISPOFFS(0));
SPI_SEND(spi, SSD1306_CLKDIV_SET); /* Set clock divider 0xd5*/
SPI_SEND(spi, SSD1306_CLKDIV(8,0)); /* 0x80*/
SPI_SEND(spi, SSD1306_CHRGPER_SET); /* Set pre-charge period 0xd9 */
SPI_SEND(spi, SSD1306_CHRGPER(0x0f,1)); /* 0xf1 or 0x22 Enhanced mode */
SPI_SEND(spi, SSD1306_CMNPAD_CONFIG); /* Set common pads / set com pins hardware configuration 0xda */
SPI_SEND(spi, SSD1306_CMNPAD(SSD1306_DEV_CMNPAD)); /* 0x12 or 0x02 */
SPI_SEND(spi, SSD1306_VCOM_SET); /* set vcomh 0xdb*/
SPI_SEND(spi, SSD1306_VCOM(0x40));
SPI_SEND(spi, SSD1306_CHRPUMP_SET); /* Set Charge Pump enable/disable 0x8d ssd1306 */
SPI_SEND(spi, SSD1306_CHRPUMP_ON); /* 0x14 close 0x10 */
/* SPI_SEND(spi, SSD1306_DCDC_MODE); */ /* DC/DC control mode: on (SSD1306 Not supported) */
/* SPI_SEND(spi, SSD1306_DCDC_ON); */
SPI_SEND(spi, SSD1306_DISPON); /* Display ON 0xaf */
/* De-select and unlock the device */
SPI_SELECT(spi, SPIDEV_DISPLAY, false);
ssd1306_unlock(priv->spi);
/* Clear the display */
up_mdelay(100);
ssd1306_fill(&priv->dev, SSD1306_Y1_BLACK);
return &priv->dev;
}
/**************************************************************************************
* Name: ssd1306_fill
*
* Description:
* This non-standard method can be used to clear the entire display by writing one
* color to the display. This is much faster than writing a series of runs.
*
* Input Parameters:
* priv - Reference to private driver structure
*
* Assumptions:
* Caller has selected the OLED section.
*
**************************************************************************************/
void ssd1306_fill(FAR struct lcd_dev_s *dev, uint8_t color)
{
FAR struct ssd1306_dev_s *priv = &g_oleddev;
unsigned int page;
/* Make an 8-bit version of the selected color */
if (color & 1)
{
color = 0xff;
}
else
{
color = 0;
}
/* Initialize the framebuffer */
memset(priv->fb, color, SSD1306_DEV_FBSIZE);
/* Lock and select device */
ssd1306_lock(priv->spi);
SPI_SELECT(priv->spi, SPIDEV_DISPLAY, true);
/* Visit each page */
for (page = 0; page < SSD1306_DEV_PAGES; page++)
{
/* Select command transfer */
SPI_CMDDATA(priv->spi, SPIDEV_DISPLAY, true);
/* Set the column address to the XOFFSET value */
SPI_SEND(priv->spi, SSD1306_SETCOLL(SSD1306_DEV_XOFFSET));
SPI_SEND(priv->spi, SSD1306_SETCOLH(0));
/* Set the page address */
SPI_SEND(priv->spi, SSD1306_PAGEADDR(page));
/* Select data transfer */
SPI_CMDDATA(priv->spi, SPIDEV_DISPLAY, false);
/* Transfer one page of the selected color */
(void)SPI_SNDBLOCK(priv->spi, &priv->fb[page * SSD1306_DEV_XRES],
SSD1306_DEV_XRES);
}
/* De-select and unlock the device */
SPI_SELECT(priv->spi, SPIDEV_DISPLAY, false);
ssd1306_unlock(priv->spi);
}
#endif /* CONFIG_LCD_SSD1306 */
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