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nuttx/drivers/lcd/memlcd.c

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/****************************************************************************
* drivers/lcd/memlcd.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/arch.h>
#include <nuttx/wqueue.h>
#include <nuttx/clock.h>
#include <nuttx/spi/spi.h>
#include <nuttx/lcd/lcd.h>
#include <nuttx/lcd/memlcd.h>
#include <arch/irq.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Bit order H/W feature must be enabled in order to support LSB first
* operation.
*/
#if !defined(CONFIG_SPI_HWFEATURES) || !defined(CONFIG_SPI_BITORDER)
# error CONFIG_SPI_HWFEATURES=y and CONFIG_SPI_BITORDER=y required by this driver
#endif
#ifndef CONFIG_ARCH_HAVE_SPI_BITORDER
# warning This platform does not support SPI LSB-bit order
#endif
/* Display resolution */
#if defined CONFIG_MEMLCD_LS013B7DH01
# define MEMLCD_XRES 144
# define MEMLCD_YRES 168
#elif defined CONFIG_MEMLCD_LS013B7DH03
# define MEMLCD_XRES 128
# define MEMLCD_YRES 128
#elif defined CONFIG_MEMLCD_LS027B7DH01A
# define MEMLCD_XRES 400
# define MEMLCD_YRES 240
#else
# error "This Memory LCD model is not supported yet."
#endif
/* lcd command */
#define MEMLCD_CMD_UPDATE (0x01)
#define MEMLCD_CMD_VCOM (0x02)
#define MEMLCD_CMD_ALL_CLEAR (0x04)
#define MEMLCD_CONTROL_BYTES (0)
/* Dolor depth and format */
#define MEMLCD_BPP 1
#define MEMLCD_COLORFMT FB_FMT_Y1
/* Bytes per logical row and column */
#define MEMLCD_XSTRIDE (MEMLCD_XRES >> 3)
#define MEMLCD_YSTRIDE (MEMLCD_YRES >> 3)
/* display memory allocation */
#define MEMLCD_FBSIZE (MEMLCD_XSTRIDE*MEMLCD_YRES)
/* Contrast setting, related to VCOM toggle frequency.
* Higher frequency gives better contrast, lower instead saves power.
*/
#define MEMLCD_CONTRAST 24
#define MEMLCD_MAXCONTRAST 60
#define MEMLCD_MINCONTRAST 1
/* Other misc settings */
#define MEMLCD_SPI_FREQUENCY 2250000
#define MEMLCD_SPI_BITS 8
#define MEMLCD_SPI_MODE SPIDEV_MODE0
#define LS_BIT (1 << 0)
#define MS_BIT (1 << 7)
#define MEMLCD_WORK_PERIOD MSEC2TICK(500)
#define TOGGLE_VCOM(dev) \
do \
{ \
dev->vcom = dev->vcom ? 0x00 : MEMLCD_CMD_VCOM; \
} \
while (0);
/****************************************************************************
* Private Type Definition
****************************************************************************/
struct memlcd_dev_s
{
/* Publicly visible device structure */
struct lcd_dev_s dev;
/* Private lcd-specific information follows */
FAR struct spi_dev_s *spi; /* Cached SPI device reference */
FAR struct memlcd_priv_s *priv; /* Board specific structure */
uint8_t contrast; /* Current contrast setting */
uint8_t power; /* Current power setting */
#ifdef CONFIG_MEMLCD_EXTCOMIN_MODE_HW
struct work_s work;
uint8_t vcom;
#else
bool pol; /* Polarity for extcomisr */
#endif
/* The memlcds does not support reading the display memory in SPI mode.
* Since there is 1 BPP and is byte access, it is necessary to keep a
* shadow copy of the framebuffer. At 128x128, it amounts to 2KB.
*/
uint8_t fb[MEMLCD_FBSIZE];
};
/****************************************************************************
* Private Function Protototypes
****************************************************************************/
/* Low-level spi helpers */
static void memlcd_select(FAR struct spi_dev_s *spi);
static void memlcd_deselect(FAR struct spi_dev_s *spi);
/* lcd data transfer methods */
static int memlcd_putrun(FAR struct lcd_dev_s *dev,
fb_coord_t row, fb_coord_t col,
FAR const uint8_t * buffer, size_t npixels);
static int memlcd_getrun(FAR struct lcd_dev_s *dev,
fb_coord_t row, fb_coord_t col,
FAR uint8_t * buffer, size_t npixels);
/* lcd configuration */
static int memlcd_getvideoinfo(FAR struct lcd_dev_s *dev,
FAR struct fb_videoinfo_s *vinfo);
static int memlcd_getplaneinfo(FAR struct lcd_dev_s *dev,
unsigned int planeno,
FAR struct lcd_planeinfo_s *pinfo);
/* lcd specific controls */
static int memlcd_getpower(struct lcd_dev_s *dev);
static int memlcd_setpower(struct lcd_dev_s *dev, int power);
static int memlcd_getcontrast(struct lcd_dev_s *dev);
static int memlcd_setcontrast(struct lcd_dev_s *dev, unsigned int contrast);
/****************************************************************************
* Private Data
****************************************************************************/
static uint8_t g_runbuffer[MEMLCD_BPP * MEMLCD_XRES / 8];
/* This structure describes the overall lcd video controller */
static const struct fb_videoinfo_s g_videoinfo =
{
.fmt = MEMLCD_COLORFMT, /* Color format: rgb16-565: rrrr rggg gggb bbbb */
.xres = MEMLCD_XRES, /* Horizontal resolution in pixel columns */
.yres = MEMLCD_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 = memlcd_putrun, /* Put a run into lcd memory */
.getrun = memlcd_getrun, /* Get a run from lcd memory */
.buffer = (uint8_t *) g_runbuffer, /* Run scratch buffer */
.bpp = MEMLCD_BPP, /* Bits-per-pixel */
};
/* This is the oled driver instance (only a single device is supported
* for now).
*/
static struct memlcd_dev_s g_memlcddev =
{
.dev =
{
/* lcd configuration */
.getvideoinfo = memlcd_getvideoinfo,
.getplaneinfo = memlcd_getplaneinfo,
/* lcd specific controls */
.getpower = memlcd_getpower,
.setpower = memlcd_setpower,
.getcontrast = memlcd_getcontrast,
.setcontrast = memlcd_setcontrast,
},
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* __set_bit - Set a bit in memory
*
* @nr: the bit to set
* @addr: the address to start counting from
*
* This function is not atomic and may be reordered. If it's called on the
* same region of memory simultaneously, the effect may be that only one
* operation succeeds.
*
****************************************************************************/
#define BIT(nr) (1 << (nr))
#define BITS_PER_BYTE 8
#define BIT_MASK(nr) (1 << ((nr) % BITS_PER_BYTE))
#define BIT_BYTE(nr) ((nr) / BITS_PER_BYTE)
static inline void __set_bit(int nr, uint8_t * addr)
{
uint8_t mask = BIT_MASK(nr);
uint8_t *p = ((uint8_t *) addr) + BIT_BYTE(nr);
*p |= mask;
}
static inline void __clear_bit(int nr, uint8_t * addr)
{
uint8_t mask = BIT_MASK(nr);
uint8_t *p = ((uint8_t *) addr) + BIT_BYTE(nr);
*p &= ~mask;
}
static inline int __test_bit(int nr, const volatile uint8_t * addr)
{
return 1 & (addr[BIT_BYTE(nr)] >> (nr & (BITS_PER_BYTE - 1)));
}
/****************************************************************************
* Name: memlcd_worker
*
* Description:
* Toggle VCOM bit
*
* Input Parameters:
* arg - Reference to the memlcd_dev_s structure
*
* Returned Value:
* None
*
****************************************************************************/
#ifdef CONFIG_MEMLCD_EXTCOMIN_MODE_HW
static void memlcd_worker(FAR void *arg)
{
FAR struct memlcd_dev_s *mlcd = arg;
uint16_t cmd = (uint16_t)mlcd->vcom;
TOGGLE_VCOM(mlcd);
memlcd_select(mlcd->spi);
up_udelay(2);
SPI_SNDBLOCK(mlcd->spi, &cmd, 2);
up_udelay(1);
memlcd_deselect(mlcd->spi);
work_queue(LPWORK, &mlcd->work, memlcd_worker, mlcd, MEMLCD_WORK_PERIOD);
}
#endif
/****************************************************************************
* Name: memlcd_select
*
* Description:
* Select the SPI, locking and re-configuring if necessary
*
* Input Parameters:
* spi - Reference to the SPI driver structure
*
* Returned Value:
* None
*
****************************************************************************/
static void memlcd_select(FAR struct spi_dev_s *spi)
{
int ret;
/* Select memlcd (locking the SPI bus in case there are multiple
* devices competing for the SPI bus
*/
SPI_LOCK(spi, true);
SPI_SELECT(spi, SPIDEV_DISPLAY(0), true);
/* Now make sure that the SPI bus is configured for the memlcd (it
* might have gotten configured for a different device while unlocked)
*/
SPI_SETMODE(spi, MEMLCD_SPI_MODE);
SPI_SETBITS(spi, MEMLCD_SPI_BITS);
ret = SPI_HWFEATURES(spi, HWFEAT_LSBFIRST);
if (ret < 0)
{
lcderr("ERROR: SPI_HWFEATURES failed to set bit order: %d\n", ret);
}
#ifdef CONFIG_MEMLCD_SPI_FREQUENCY
SPI_SETFREQUENCY(spi, CONFIG_MEMLCD_SPI_FREQUENCY);
#else
SPI_SETFREQUENCY(spi, MEMLCD_SPI_FREQUENCY);
#endif
}
/****************************************************************************
* Name: memlcd_deselect
*
* Description:
* De-select the SPI
*
* Input Parameters:
* spi - Reference to the SPI driver structure
*
* Returned Value:
* None
*
****************************************************************************/
static void memlcd_deselect(FAR struct spi_dev_s *spi)
{
/* De-select memlcd and relinquish the spi bus. */
SPI_SELECT(spi, SPIDEV_DISPLAY(0), false);
SPI_LOCK(spi, false);
}
/****************************************************************************
* Name: memlcd_clear
*
* Description:
* This method can be used to clear the entire display.
*
* Input Parameters:
* mlcd - Reference to private driver structure
*
****************************************************************************/
static inline void memlcd_clear(FAR struct memlcd_dev_s *mlcd)
{
uint16_t cmd = MEMLCD_CMD_VCOM | MEMLCD_CMD_ALL_CLEAR;
lcdinfo("Clear display\n");
memlcd_select(mlcd->spi);
up_udelay(2);
SPI_SNDBLOCK(mlcd->spi, &cmd, 2);
up_udelay(1);
memlcd_deselect(mlcd->spi);
}
/****************************************************************************
* Name: memlcd_extcominisr
*
* Description:
* This method enables/disables the polarity (VCOM) toggling behavior for
* the Memory LCD. Which is always used within setpower() call.
* Basically, the frequency shall be 1Hz~60Hz.
* If use hardware mode to toggle VCOM, we need to send specific command at
* a constant frequency to trigger the LCD internal hardware logic.
* While use software mode, we set up a timer to toggle EXTCOMIN connected
* IO, basically, it is a hardware timer to ensure a constant frequency.
*
* Input Parameters:
* mlcd - Reference to private driver structure
*
* Assumptions:
* Board specific logic needs to be provided to support it.
*
****************************************************************************/
static int memlcd_extcominisr(int irq, FAR void *context, void *arg)
{
FAR struct memlcd_dev_s *mlcd = &g_memlcddev;
#ifndef CONFIG_MEMLCD_EXTCOMIN_MODE_HW
mlcd->pol = !mlcd->pol;
mlcd->priv->setpolarity(mlcd->pol);
#endif
return OK;
}
/****************************************************************************
* Name: memlcd_putrun
*
* Description:
* This method can be used to write a partial raster line to the LCD.
*
* Input Parameters:
* dev - The lcd device
* 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)
*
****************************************************************************/
static int memlcd_putrun(FAR struct lcd_dev_s *dev,
fb_coord_t row, fb_coord_t col,
FAR const uint8_t * buffer, size_t npixels)
{
FAR struct memlcd_dev_s *mlcd = (FAR struct memlcd_dev_s *)dev;
uint16_t cmd;
uint8_t *p;
uint8_t *pfb;
uint8_t usrmask;
int i;
DEBUGASSERT(buffer);
lcdinfo("row: %d col: %d npixels: %d\n", row, col, npixels);
#ifdef CONFIG_LCD_PACKEDMSFIRST
usrmask = MS_BIT;
#else
usrmask = LS_BIT;
#endif
pfb = &mlcd->fb[row * MEMLCD_XSTRIDE];
p = pfb + (col >> 3);
for (i = 0; i < npixels; i++)
{
if ((*buffer & usrmask) != 0)
{
__set_bit(col % 8 + i, p);
}
else
{
__clear_bit(col % 8 + i, p);
}
#ifdef CONFIG_MEMLCD_BYTE_PER_PIXEL
buffer++;
#elif defined(CONFIG_LCD_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
}
/* Need to adjust start row by one because Memory LCD starts counting
* lines from 1, while the display interface starts from 0.
*/
row++;
memlcd_select(mlcd->spi);
up_udelay(2);
cmd = MEMLCD_CMD_UPDATE | row << 8;
SPI_SNDBLOCK(mlcd->spi, &cmd, 2);
SPI_SNDBLOCK(mlcd->spi, pfb, MEMLCD_XRES / 8 + MEMLCD_CONTROL_BYTES);
cmd = 0x0000;
SPI_SNDBLOCK(mlcd->spi, &cmd, 2);
up_udelay(1);
memlcd_deselect(mlcd->spi);
return OK;
}
/****************************************************************************
* Name: memlcd_getrun
*
* Description:
* This method can be used to read a partial raster line from the LCD.
*
* dev - The lcd device
* 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)
*
****************************************************************************/
static int memlcd_getrun(FAR struct lcd_dev_s *dev,
fb_coord_t row, fb_coord_t col,
FAR uint8_t * buffer, size_t npixels)
{
FAR struct memlcd_dev_s *mlcd = (FAR struct memlcd_dev_s *)dev;
uint8_t *p;
uint8_t *pfb;
uint8_t usrmask;
int i;
DEBUGASSERT(buffer);
lcdinfo("row: %d col: %d npixels: %d\n", row, col, npixels);
#ifdef CONFIG_LCD_PACKEDMSFIRST
usrmask = MS_BIT;
#else
usrmask = LS_BIT;
#endif
pfb = &mlcd->fb[row * MEMLCD_XSTRIDE];
p = pfb + (col >> 3);
for (i = 0; i < npixels; i++)
{
if (__test_bit(col % 8 + i, p))
{
*buffer |= usrmask;
}
else
{
*buffer &= ~usrmask;
}
#ifdef CONFIG_MEMLCD_BYTE_PER_PIXEL
buffer++;
#elif defined(CONFIG_LCD_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
}
return OK;
}
/****************************************************************************
* Name: memlcd_getvideoinfo
*
* Description:
* Get information about the LCD video controller configuration.
*
****************************************************************************/
static int memlcd_getvideoinfo(FAR struct lcd_dev_s *dev,
FAR struct fb_videoinfo_s *vinfo)
{
DEBUGASSERT(dev && vinfo);
lcdinfo("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: memlcd_getplaneinfo
*
* Description:
* Get information about the configuration of each LCD color plane.
*
****************************************************************************/
static int memlcd_getplaneinfo(FAR struct lcd_dev_s *dev,
unsigned int planeno,
FAR struct lcd_planeinfo_s *pinfo)
{
DEBUGASSERT(pinfo && planeno == 0);
lcdinfo("planeno: %d bpp: %d\n", planeno, g_planeinfo.bpp);
memcpy(pinfo, &g_planeinfo, sizeof(struct lcd_planeinfo_s));
pinfo->dev = dev;
return OK;
}
/****************************************************************************
* Name: memlcd_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 memlcd_getpower(FAR struct lcd_dev_s *dev)
{
FAR struct memlcd_dev_s *mlcd = (FAR struct memlcd_dev_s *)dev;
DEBUGASSERT(mlcd);
lcdinfo("%d\n", mlcd->power);
return mlcd->power;
}
/****************************************************************************
* Name: memlcd_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 memlcd_setpower(FAR struct lcd_dev_s *dev, int power)
{
struct memlcd_dev_s *mlcd = (struct memlcd_dev_s *)dev;
DEBUGASSERT(mlcd && (unsigned)power <= CONFIG_LCD_MAXPOWER && mlcd->spi);
lcdinfo("%d\n", power);
mlcd->power = power;
if (power > 0)
{
mlcd->priv->dispcontrol(1);
memlcd_clear(mlcd);
}
else
{
mlcd->priv->dispcontrol(0);
}
return OK;
}
/****************************************************************************
* Name: memlcd_getcontrast
*
* Description:
* Get the current contrast setting (0-CONFIG_LCD_MAXCONTRAST).
*
****************************************************************************/
static int memlcd_getcontrast(struct lcd_dev_s *dev)
{
struct memlcd_dev_s *mlcd = (struct memlcd_dev_s *)dev;
DEBUGASSERT(mlcd);
lcdinfo("contrast: %d\n", mlcd->contrast);
return mlcd->contrast;
}
/****************************************************************************
* Name: memlcd_setcontrast
*
* Description:
* Set LCD panel contrast (0-CONFIG_LCD_MAXCONTRAST).
*
****************************************************************************/
static int memlcd_setcontrast(struct lcd_dev_s *dev, unsigned int contrast)
{
struct memlcd_dev_s *mlcd = (struct memlcd_dev_s *)dev;
DEBUGASSERT(mlcd);
lcdinfo("contrast: %d\n", contrast);
if (contrast > MEMLCD_MAXCONTRAST)
{
contrast = MEMLCD_MAXCONTRAST;
}
if (contrast < MEMLCD_MINCONTRAST)
{
contrast = MEMLCD_MINCONTRAST;
}
mlcd->contrast = contrast;
mlcd->priv->setvcomfreq(contrast);
return OK;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: memlcd_initialize
*
* Description:
* Initialize the Sharp Memory LCD 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.
* priv - Board specific structure
* devno - A value in the range of 0 through CONFIG_MEMLCD_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 LCD. NULL is returned on any failure.
*
****************************************************************************/
FAR struct lcd_dev_s *memlcd_initialize(FAR struct spi_dev_s *spi,
FAR struct memlcd_priv_s *priv,
unsigned int devno)
{
FAR struct memlcd_dev_s *mlcd = &g_memlcddev;
DEBUGASSERT(spi && priv && devno == 0);
/* Register board specific functions */
mlcd->priv = priv;
mlcd->spi = spi;
#ifdef CONFIG_MEMLCD_EXTCOMIN_MODE_HW
mlcd->vcom = MEMLCD_CMD_VCOM;
work_queue(LPWORK, &mlcd->work, memlcd_worker, mlcd, MEMLCD_WORK_PERIOD);
#else
mlcd->priv->attachirq(memlcd_extcominisr, mlcd);
#endif
lcdinfo("done\n");
return &mlcd->dev;
}
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