sergiotarxz/nuttx
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity
7689392528
nuttx/drivers/lcd/st7032.c
Alin Jerpelea 5e6d58dd03 drivers: Alan Carvalho de Assis: update licenses to Apache 
Alan Carvalho de Assis has submitted the SGA and we can migrate the licenses
 to Apache.

Gregory Nutt has submitted the SGA and we can migrate the licenses
 to Apache.

Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>
2021-03-13 05:56:43 -08:00

1096 lines
29 KiB
C
Raw Blame History

/****************************************************************************
* drivers/lcd/st7032.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.
*
****************************************************************************/
/* Alphanumeric LCD driver for ST7032i (tested on JLX1602G-390) */
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdlib.h>
#include <errno.h>
#include <debug.h>
#include <string.h>
#include <nuttx/kmalloc.h>
#include <nuttx/signal.h>
#include <nuttx/ascii.h>
#include <nuttx/fs/fs.h>
#include <nuttx/lcd/slcd_codec.h>
#include <nuttx/lcd/slcd_ioctl.h>
#include <nuttx/i2c/i2c_master.h>
#include <nuttx/lcd/st7032.h>
#ifndef CONFIG_LIB_SLCDCODEC
# error please also select Library Routines, Segment LCD CODEC
#endif
#if defined(CONFIG_I2C) && defined(CONFIG_LCD_ST7032)
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* I2C frequency */
#ifndef CONFIG_ST7032_I2C_FREQ
# define CONFIG_ST7032_I2C_FREQ 400000
#endif
/****************************************************************************
* Private Types
****************************************************************************/
struct st7032_dev_s
{
FAR struct i2c_master_s *i2c; /* I2C interface */
uint8_t row; /* Current row position to write on display */
uint8_t col; /* Current col position to write on display */
uint8_t buffer[ST7032_MAX_ROW * ST7032_MAX_COL];
bool pendscroll;
sem_t sem_excl;
};
struct lcd_instream_s
{
struct lib_instream_s stream;
FAR const char *buffer;
ssize_t nbytes;
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static inline void st7032_write_inst(FAR struct st7032_dev_s *priv,
uint8_t cmd);
static inline void st7032_write_data(FAR struct st7032_dev_s *priv,
uint8_t value);
static inline void st7032_setcontrast(FAR struct st7032_dev_s *priv,
int8_t contrast);
static void lcd_scroll_up(FAR struct st7032_dev_s *priv);
/* Character driver methods */
static int st7032_open(FAR struct file *filep);
static int st7032_close(FAR struct file *filep);
static ssize_t st7032_read(FAR struct file *filep, FAR char *buffer,
size_t buflen);
static ssize_t st7032_write(FAR struct file *filep, FAR const char *buffer,
size_t buflen);
static off_t st7032_seek(FAR struct file *filep, off_t offset, int whence);
static int st7032_ioctl(FAR struct file *filep, int cmd,
unsigned long arg);
/****************************************************************************
* Private Data
****************************************************************************/
static const struct file_operations g_st7032fops =
{
st7032_open, /* open */
st7032_close, /* close */
st7032_read, /* read */
st7032_write, /* write */
st7032_seek, /* seek */
st7032_ioctl, /* ioctl */
NULL, /* poll */
#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
NULL /* unlink */
#endif
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: st7032_write_inst
*
* Description:
* Write an Instruction command to ST7032
*
****************************************************************************/
static inline void st7032_write_inst(FAR struct st7032_dev_s *priv,
uint8_t cmd)
{
struct i2c_msg_s msg;
uint8_t data[2];
int ret;
/* Prepare data to send */
data[0] = 0x00;
data[1] = cmd;
/* Setup the ST7032 Co command */
msg.frequency = CONFIG_ST7032_I2C_FREQ; /* I2C frequency */
msg.addr = ST7032_I2C_ADDR; /* 7-bit address */
msg.flags = 0; /* Write transaction, beginning with START */
msg.buffer = (FAR uint8_t *) data; /* Transfer from this address */
msg.length = 2; /* Send two bytes */
/* Perform the transfer */
ret = I2C_TRANSFER(priv->i2c, &msg, 1);
if (ret < 0)
{
lcderr("ERROR: I2C_TRANSFER failed: %d\n", ret);
}
/* Delay 30us */
nxsig_usleep(30);
}
/****************************************************************************
* Name: st7032_write_data
*
* Description:
* Write a Data command to ST7032
*
****************************************************************************/
static inline void st7032_write_data(FAR struct st7032_dev_s *priv,
uint8_t value)
{
struct i2c_msg_s msg;
uint8_t data[2];
int ret;
/* Prepare data to send */
data[0] = ST7032_CTRLBIT_RS;
data[1] = value;
/* Setup the ST7032 Co command */
msg.frequency = CONFIG_ST7032_I2C_FREQ; /* I2C frequency */
msg.addr = ST7032_I2C_ADDR; /* 7-bit address */
msg.flags = 0; /* Write transaction, beginning with START */
msg.buffer = (FAR uint8_t *) data; /* Transfer from this address */
msg.length = 2; /* Send two bytes: Co command + cmd */
/* Perform the transfer */
ret = I2C_TRANSFER(priv->i2c, &msg, 1);
if (ret < 0)
{
lcderr("ERROR: I2C_TRANSFER failed: %d\n", ret);
}
/* Delay 30us */
nxsig_usleep(30);
}
static inline void st7032_setcontrast(FAR struct st7032_dev_s *priv,
int8_t contrast)
{
if (contrast < ST7032_CONTRAST_MIN)
{
contrast = ST7032_CONTRAST_MIN;
}
else if (contrast > ST7032_CONTRAST_MAX)
{
contrast = ST7032_CONTRAST_MAX;
}
st7032_write_inst(priv, ST7032_CONTRAST_SET | (contrast & 0x0f));
st7032_write_inst(priv, (contrast >> 4) | ST7032_POWER_ICON_CTRL_SET |
POWER_ICON_BOST_CTRL_BON);
}
/****************************************************************************
* Name: lcd_getdata
*
* Description:
* Simulate reading data from LCD, we are reading from internal buffer
*
****************************************************************************/
static inline uint8_t lcd_getdata(FAR struct st7032_dev_s *priv)
{
uint8_t data;
data = priv->buffer[priv->row * priv->col];
return data;
}
/****************************************************************************
* Name: rc2addr
*
* Description:
* This converts a row/column pair to a screen memory address.
*
****************************************************************************/
static inline uint8_t rc2addr(FAR struct st7032_dev_s *priv)
{
/* line0 @ 0x00 - 0x27, line1 @ 0x40-0x67 */
return priv->row * 0x40 + priv->col;
}
/****************************************************************************
* Name: addr2rc
*
* Description:
* This converts a screen memory address to a row/column pair.
*
****************************************************************************/
static inline void addr2rc(FAR struct st7032_dev_s *priv, uint8_t addr,
FAR uint8_t *row, FAR uint8_t *col)
{
*row = addr / 0x40;
*col = addr % 0x40;
}
/****************************************************************************
* Name: lcd_set_curpos
*
* Description:
* This sets the cursor position based on row, column addressing.
*
* Input Parameters:
* priv - device instance
*
****************************************************************************/
static void lcd_set_curpos(FAR struct st7032_dev_s *priv)
{
uint8_t addr;
addr = rc2addr(priv);
st7032_write_inst(priv, ST7032_SET_DDRAM_ADDR | addr); /* set DDRAM address */
}
/****************************************************************************
* Name: lcd_putdata
*
* Description:
* Write a byte to the LCD and update column/row position
*
****************************************************************************/
static inline void lcd_putdata(FAR struct st7032_dev_s *priv, uint8_t data)
{
/* Send data to display */
st7032_write_data(priv, data);
/* Save it in the buffer because we cannot read from display */
priv->buffer[priv->col * priv->row] = data;
/* Update col/row positions */
priv->col++;
if (priv->col >= ST7032_MAX_COL)
{
priv->col = 0;
priv->row++;
}
if (priv->row >= ST7032_MAX_ROW)
{
priv->pendscroll = true;
priv->row = ST7032_MAX_ROW - 1;
}
/* Update cursor position */
lcd_set_curpos(priv);
}
/****************************************************************************
* Name: lcd_scroll_up
*
* Description:
* Scroll the display up, and clear the new (last) line.
*
****************************************************************************/
static void lcd_scroll_up(FAR struct st7032_dev_s *priv)
{
FAR uint8_t *data;
int currow;
int curcol;
data = (FAR uint8_t *)kmm_malloc(ST7032_MAX_COL);
if (NULL == data)
{
lcdinfo("Failed to allocate buffer in lcd_scroll_up()\n");
return;
}
/* Clear display */
st7032_write_inst(priv, ST7032_CLEAR_DISPLAY);
for (currow = 1; currow < ST7032_MAX_ROW; ++currow)
{
priv->row = currow;
for (curcol = 0; curcol < ST7032_MAX_COL; ++curcol)
{
priv->col = curcol;
data[curcol] = lcd_getdata(priv);
}
priv->col = 0;
priv->row = currow - 1;
lcd_set_curpos(priv);
for (curcol = 0; curcol < ST7032_MAX_COL; ++curcol)
{
lcd_putdata(priv, data[curcol]);
}
}
priv->col = 0;
priv->row = ST7032_MAX_ROW - 1;
lcd_set_curpos(priv);
for (curcol = 0; curcol < ST7032_MAX_COL; ++curcol)
{
lcd_putdata(priv, ' ');
}
priv->col = 0;
priv->row = ST7032_MAX_ROW - 1;
lcd_set_curpos(priv);
kmm_free(data);
return;
}
/****************************************************************************
* Name: lcd_codec_action
*
* Description:
* Perform an 'action' as per the Segment LCD codec.
*
* Input Parameters:
* priv - device instance
* code - SLCD code action code
* count - count param for those actions that take it
*
****************************************************************************/
static void lcd_codec_action(FAR struct st7032_dev_s *priv,
enum slcdcode_e code, uint8_t count)
{
switch (code)
{
/* Erasure */
case SLCDCODE_BACKDEL: /* Backspace (backward delete) N characters */
{
if (count <= 0) /* we need to delete more 0 positions */
{
break;
}
else
{
if (count > priv->col) /* saturate to preceding columns available */
{
count = priv->col;
}
priv->col = priv->col - count;
lcd_set_curpos(priv);
}
/* ... and conscientiously fall through to next case ... */
}
case SLCDCODE_FWDDEL: /* Delete (forward delete) N characters, moving text */
{
if (count <= 0) /* we need to delete more 0 positions */
{
break;
}
else
{
uint8_t start;
uint8_t end;
uint8_t i;
uint8_t data;
start = priv->col + count;
if (start >= ST7032_MAX_COL) /* silly case of nothing left */
{
break;
}
end = start + count;
if (end > ST7032_MAX_COL) /* saturate */
{
end = ST7032_MAX_COL;
}
for (i = priv->col; i < end; ++start, ++i) /* much like memmove */
{
priv->col = start;
lcd_set_curpos(priv);
data = lcd_getdata(priv);
priv->col = i;
lcd_set_curpos(priv);
lcd_putdata(priv, data);
}
for (; i < ST7032_MAX_COL; ++i) /* much like memset */
{
lcd_putdata(priv, ' ');
}
lcd_set_curpos(priv);
}
}
break;
case SLCDCODE_ERASE: /* Erase N characters from the cursor position */
if (count > 0)
{
uint8_t end;
uint8_t i;
end = priv->col + count;
if (end > ST7032_MAX_COL)
{
end = ST7032_MAX_COL;
}
for (i = priv->col; i < end; ++i)
{
lcd_putdata(priv, ' ');
}
lcd_set_curpos(priv);
}
break;
case SLCDCODE_CLEAR: /* Home the cursor and erase the entire display */
{
st7032_write_inst(priv, ST7032_CLEAR_DISPLAY);
}
break;
case SLCDCODE_ERASEEOL: /* Erase from the cursor position to the end of line */
{
uint8_t i;
for (i = priv->col; i < ST7032_MAX_COL; ++i)
{
lcd_putdata(priv, ' ');
}
lcd_set_curpos(priv);
}
break;
/* Cursor movement */
case SLCDCODE_LEFT: /* Cursor left by N characters */
{
if (count > priv->col)
{
priv->col = 0;
}
else
{
priv->col -= count;
}
lcd_set_curpos(priv);
}
break;
case SLCDCODE_RIGHT: /* Cursor right by N characters */
{
priv->col += count;
if (priv->col >= ST7032_MAX_COL)
{
priv->col = ST7032_MAX_COL - 1;
}
lcd_set_curpos(priv);
}
break;
case SLCDCODE_UP: /* Cursor up by N lines */
{
if (count > priv->row)
{
priv->row = 0;
}
else
{
priv->row -= count;
}
lcd_set_curpos(priv);
}
break;
case SLCDCODE_DOWN: /* Cursor down by N lines */
{
priv->row += count;
if (priv->row >= ST7032_MAX_ROW)
{
priv->row = ST7032_MAX_ROW - 1;
}
lcd_set_curpos(priv);
}
break;
case SLCDCODE_HOME: /* Cursor home */
{
priv->col = 0;
lcd_set_curpos(priv);
}
break;
case SLCDCODE_END: /* Cursor end */
{
priv->col = ST7032_MAX_COL - 1;
lcd_set_curpos(priv);
}
break;
case SLCDCODE_PAGEUP: /* Cursor up by N pages */
case SLCDCODE_PAGEDOWN: /* Cursor down by N pages */
break; /* Not supportable on this SLCD */
/* Blinking */
case SLCDCODE_BLINKSTART: /* Start blinking with current cursor position */
st7032_write_inst(priv, ST7032_DISPLAY_ON_OFF | DISPLAY_ON_OFF_D |
DISPLAY_ON_OFF_C | DISPLAY_ON_OFF_B);
break;
case SLCDCODE_BLINKEND: /* End blinking after the current cursor position */
case SLCDCODE_BLINKOFF: /* Turn blinking off */
st7032_write_inst(priv, ST7032_DISPLAY_ON_OFF | DISPLAY_ON_OFF_D |
DISPLAY_ON_OFF_C);
break; /* Not implemented */
/* These are actually unreportable errors */
default:
case SLCDCODE_NORMAL: /* Not a special keycode */
break;
}
}
/****************************************************************************
* Name: lcd_getstream
*
* Description:
* Get one character from the LCD codec stream.
*
****************************************************************************/
static int lcd_getstream(FAR struct lib_instream_s *instream)
{
FAR struct lcd_instream_s *lcdstream =
(FAR struct lcd_instream_s *)instream;
if (lcdstream->nbytes > 0)
{
lcdstream->nbytes--;
lcdstream->stream.nget++;
return (int)*lcdstream->buffer++;
}
return EOF;
}
/****************************************************************************
* Name: lcd_init
*
* Description:
* perform the initialization sequence to get the LCD into a known state.
*
****************************************************************************/
static void lcd_init(FAR struct st7032_dev_s *priv)
{
uint8_t data;
/* Initialize the Display */
data = ST7032_FUNCTION_SET | FUNCTION_SET_DL | FUNCTION_SET_N |
FUNCTION_SET_IS;
st7032_write_inst(priv, data);
data = ST7032_INT_OSC_FREQ | INT_OSC_FREQ_BS | INT_OSC_FREQ_F2;
st7032_write_inst(priv, data);
data = ST7032_POWER_ICON_CTRL_SET | POWER_ICON_BOST_CTRL_ION;
st7032_write_inst(priv, data);
/* Set contrast */
st7032_setcontrast(priv, DEFAULT_CONTRAST);
data = ST7032_FOLLOWER_CTRL | FOLLOWER_CTRL_FON | FOLLOWER_CTRL_RAB2;
st7032_write_inst(priv, data);
/* Turn ON Display and Cursor Blinking */
data = ST7032_DISPLAY_ON_OFF | DISPLAY_ON_OFF_D | DISPLAY_ON_OFF_C |
DISPLAY_ON_OFF_B;
st7032_write_inst(priv, data);
/* Increasing Mode: Writing from Left to Right */
data = ST7032_ENTRY_MODE_SET | ENTRY_MODE_SET_ID;
st7032_write_inst(priv, data);
/* Clear Display */
data = ST7032_CLEAR_DISPLAY;
st7032_write_inst(priv, data);
}
/****************************************************************************
* Name: lcd_curpos_to_fpos
*
* Description:
* Convert a screen cursor pos (row,col) to a file logical offset. This
* includes 'synthesized' line feeds at the end of screen lines.
*
****************************************************************************/
static void lcd_curpos_to_fpos(FAR struct st7032_dev_s *priv,
uint8_t row, uint8_t col, FAR off_t *fpos)
{
/* the logical file position is the linear position plus any synthetic LF */
*fpos = (row * ST7032_MAX_COL) + col + row;
}
/****************************************************************************
* Name: st7032_open
*
* Description:
* This function is called whenever the ST7032 device is opened.
*
****************************************************************************/
static int st7032_open(FAR struct file *filep)
{
return OK;
}
/****************************************************************************
* Name: st7032_close
*
* Description:
* This routine is called when the LM-75 device is closed.
*
****************************************************************************/
static int st7032_close(FAR struct file *filep)
{
return OK;
}
/****************************************************************************
* Name: st7032_read
****************************************************************************/
static ssize_t st7032_read(FAR struct file *filep, FAR char *buffer,
size_t buflen)
{
return -ENOSYS;
}
/****************************************************************************
* Name: st7032_write
****************************************************************************/
static ssize_t st7032_write(FAR struct file *filep, FAR const char *buffer,
size_t buflen)
{
FAR struct inode *inode = filep->f_inode;
FAR struct st7032_dev_s *priv = inode->i_private;
struct lcd_instream_s instream;
struct slcdstate_s state;
enum slcdret_e result;
uint8_t ch;
uint8_t count;
nxsem_wait(&priv->sem_excl);
/* Initialize the stream for use with the SLCD CODEC */
instream.stream.get = lcd_getstream;
instream.stream.nget = 0;
instream.buffer = buffer;
instream.nbytes = buflen;
/* Now decode and process every byte in the input buffer */
memset(&state, 0, sizeof(struct slcdstate_s));
while ((result = slcd_decode(&instream.stream, &state, &ch, &count)) !=
SLCDRET_EOF)
{
/* Is there some pending scroll? */
if (priv->pendscroll)
{
lcd_scroll_up(priv);
priv->pendscroll = false;
}
if (result == SLCDRET_CHAR) /* A normal character was returned */
{
/* Check for ASCII control characters */
if (ch == ASCII_TAB)
{
/* Blink Cursor? Shouldn't it be just 4 spaces to indicate
* TAB?
*/
st7032_write_inst(priv, ST7032_DISPLAY_ON_OFF |
DISPLAY_ON_OFF_D | DISPLAY_ON_OFF_C |
DISPLAY_ON_OFF_B);
}
else if (ch == ASCII_VT)
{
/* Turn the backlight on */
/* TODO: lcd_backlight(priv, true); */
}
else if (ch == ASCII_FF)
{
/* Turn the backlight off */
/* TODO: lcd_backlight(priv, false); */
}
else if (ch == ASCII_CR)
{
/* Perform a Home */
priv->col = 0;
lcd_set_curpos(priv);
}
else if (ch == ASCII_SO)
{
st7032_write_inst(priv, ST7032_DISPLAY_ON_OFF |
DISPLAY_ON_OFF_D);
}
else if (ch == ASCII_SI)
{
/* Perform the re-initialize */
lcd_init(priv);
priv->row = 0;
priv->col = 0;
}
else if (ch == ASCII_LF)
{
/* unixian line term; go to start of next line */
priv->row += 1;
if (priv->row >= ST7032_MAX_ROW)
{
priv->pendscroll = true;
priv->row = ST7032_MAX_ROW - 1;
}
priv->col = 0;
lcd_set_curpos(priv);
}
else if (ch == ASCII_BS)
{
/* Perform the backward deletion */
lcd_codec_action(priv, SLCDCODE_BACKDEL, 1);
}
else if (ch == ASCII_DEL)
{
/* Perform the forward deletion */
lcd_codec_action(priv, SLCDCODE_FWDDEL, 1);
}
else
{
/* Just print it! */
lcd_putdata(priv, ch);
}
}
else /* (result == SLCDRET_SPEC) */ /* A special SLCD action was returned */
{
lcd_codec_action(priv, (enum slcdcode_e)ch, count);
}
}
/* Wherever we wound up, update our logical file pos to reflect it */
lcd_curpos_to_fpos(priv, priv->row, priv->col, &filep->f_pos);
nxsem_post(&priv->sem_excl);
return buflen;
}
/****************************************************************************
* Name: st7032_seek
*
* Description:
* Seek the logical file pointer to the specified position. This is
* probably not very interesting except possibly for (SEEK_SET, 0) to
* rewind the pointer for a subsequent read().
* The file pointer is logical, and includes synthesized LF chars at the
* end of the display lines.
*
****************************************************************************/
static off_t st7032_seek(FAR struct file *filep, off_t offset, int whence)
{
FAR struct inode *inode = filep->f_inode;
FAR struct st7032_dev_s *priv =
(FAR struct st7032_dev_s *)inode->i_private;
off_t maxpos;
off_t pos;
nxsem_wait(&priv->sem_excl);
maxpos = ST7032_MAX_ROW * ST7032_MAX_COL + (ST7032_MAX_ROW - 1);
pos = filep->f_pos;
switch (whence)
{
case SEEK_CUR:
pos += offset;
if (pos > maxpos)
{
pos = maxpos;
}
else if (pos < 0)
{
pos = 0;
}
filep->f_pos = pos;
break;
case SEEK_SET:
pos = offset;
if (pos > maxpos)
{
pos = maxpos;
}
else if (pos < 0)
{
pos = 0;
}
filep->f_pos = pos;
break;
case SEEK_END:
pos = maxpos + offset;
if (pos > maxpos)
{
pos = maxpos;
}
else if (pos < 0)
{
pos = 0;
}
filep->f_pos = pos;
break;
default:
/* Return EINVAL if the whence argument is invalid */
pos = (off_t)-EINVAL;
break;
}
nxsem_post(&priv->sem_excl);
return pos;
}
/****************************************************************************
* Name: st7032_ioctl
*
* Description:
* Perform device operations that are outside the standard I/O model.
*
****************************************************************************/
static int st7032_ioctl(FAR struct file *filep, int cmd,
unsigned long arg)
{
switch (cmd)
{
case SLCDIOC_GETATTRIBUTES: /* Get the attributes of the SLCD */
{
FAR struct inode *inode = filep->f_inode;
FAR struct slcd_attributes_s *attr =
(FAR struct slcd_attributes_s *)((uintptr_t)arg);
lcdinfo("SLCDIOC_GETATTRIBUTES:\n");
if (!attr)
{
return -EINVAL;
}
attr->nrows = ST7032_MAX_ROW;
attr->ncolumns = ST7032_MAX_COL;
attr->nbars = 0;
attr->maxcontrast = 0;
attr->maxbrightness = 1; /* 'brightness' for us is the backlight */
}
break;
case SLCDIOC_CURPOS: /* Get the SLCD cursor position */
{
FAR struct inode *inode = filep->f_inode;
FAR struct st7032_dev_s *priv =
(FAR struct st7032_dev_s *)inode->i_private;
FAR struct slcd_curpos_s *attr =
(FAR struct slcd_curpos_s *)((uintptr_t)arg);
attr->row = priv->row;
attr->column = priv->col;
}
break;
case SLCDIOC_GETBRIGHTNESS: /* Get the current brightness setting */
{
FAR struct inode *inode = filep->f_inode;
FAR struct st7032_dev_s *priv =
(FAR struct st7032_dev_s *)inode->i_private;
nxsem_wait(&priv->sem_excl);
*(FAR int *)((uintptr_t)arg) = 1; /* Hardcoded */
nxsem_post(&priv->sem_excl);
}
break;
case SLCDIOC_SETBRIGHTNESS: /* Set the brightness to a new value */
{
FAR struct inode *inode = filep->f_inode;
FAR struct st7032_dev_s *priv =
(FAR struct st7032_dev_s *)inode->i_private;
nxsem_wait(&priv->sem_excl);
/* TODO: set display contrast */
nxsem_post(&priv->sem_excl);
}
break;
case SLCDIOC_SETBAR: /* Set bars on a bar display */
case SLCDIOC_GETCONTRAST: /* Get the current contrast setting */
case SLCDIOC_SETCONTRAST: /* Set the contrast to a new value */
default:
return -ENOTTY;
}
return OK;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: st7032_register
*
* Description:
* Register the ST7032 character device as 'devpath'
*
* Input Parameters:
* devpath - The full path to the driver to register. E.g., "/dev/temp0"
* i2c - An instance of the I2C interface to use to communicate with
* ST7032
*
* Returned Value:
* Zero (OK) on success; a negated errno value on failure.
*
****************************************************************************/
int st7032_register(FAR const char *devpath, FAR struct i2c_master_s *i2c)
{
FAR struct st7032_dev_s *priv;
int ret;
/* Initialize the ST7032 device structure */
priv = (FAR struct st7032_dev_s *)kmm_malloc(sizeof(struct st7032_dev_s));
if (!priv)
{
snerr("ERROR: Failed to allocate instance\n");
return -ENOMEM;
}
/* Setup priv with initial values */
priv->i2c = i2c;
priv->col = 0;
priv->row = 0;
priv->pendscroll = false;
nxsem_init(&priv->sem_excl, 0, 1);
/* Initialize the display */
lcd_init(priv);
/* Register the driver */
ret = register_driver(devpath, &g_st7032fops, 0666, priv);
if (ret < 0)
{
snerr("ERROR: Failed to register driver: %d\n", ret);
kmm_free(priv);
}
return ret;
}
#endif /* CONFIG_SPI && CONFIG_ST7032 */
Reference in New Issue View Git Blame Copy Permalink