nuttx/drivers/lcd/ssd1306_spi.c

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/****************************************************************************
* drivers/lcd/ssd1306_spi.c
*
* Copyright (C) 2015 Alan Carvalho de Assis. All rights reserved.
* Author: Alan Carvalho de Assis <acassis@gmail.com>
*
* 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <unistd.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/kmalloc.h>
#include <nuttx/lcd/ssd1306.h>
#include <nuttx/spi/spi.h>
#include "ssd1306.h"
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#if defined(CONFIG_LCD_SSD1306) && defined(CONFIG_LCD_SSD1306_SPI)
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: ssd1306_configspi
*
* Description:
*
****************************************************************************/
static inline void ssd1306_configspi(FAR struct spi_dev_s *spi)
{
lcdinfo("Mode: %d Bits: 8 Frequency: %d\n",
CONFIG_SSD1306_SPIMODE, CONFIG_SSD1306_FREQUENCY);
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/* Configure SPI for the SSD1306 */
SPI_SETMODE(spi, CONFIG_SSD1306_SPIMODE);
SPI_SETBITS(spi, 8);
(void)SPI_HWFEATURES(spi, 0);
(void)SPI_SETFREQUENCY(spi, CONFIG_SSD1306_FREQUENCY);
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: ssd1306_sendbyte
*
* Description:
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* Write a value to an 8-bit value to SSD1306
*
****************************************************************************/
void ssd1306_sendbyte(FAR struct ssd1306_dev_s *priv, uint8_t regval)
{
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#ifdef CONFIG_LCD_SSD1306_REGDEBUG
_err("->0x%02x\n", regval);
#endif
/* Send byte value to display */
(void)SPI_SEND(priv->spi, regval);
}
/****************************************************************************
* Name: ssd1306_sendblk
*
* Description:
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* Write an array of bytes to SSD1306
*
****************************************************************************/
void ssd1306_sendblk(FAR struct ssd1306_dev_s *priv, uint8_t *data, uint8_t len)
{
/* Send byte value to display */
(void)SPI_SNDBLOCK(priv->spi, data, len);
}
/****************************************************************************
* Name: ssd1306_select
*
* Description:
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* Enable/Disable SSD1306 SPI CS
*
****************************************************************************/
void ssd1306_select(FAR struct ssd1306_dev_s *priv, bool cs)
{
/* If we are selecting the device */
if (cs == true)
{
/* If SPI bus is shared then lock and configure it */
(void)SPI_LOCK(priv->spi, true);
ssd1306_configspi(priv->spi);
}
/* Select/deselect SPI device */
SPI_SELECT(priv->spi, SPIDEV_DISPLAY, cs);
/* If we are deselecting the device */
if (cs == false)
{
/* Unlock bus */
(void)SPI_LOCK(priv->spi, false);
}
}
/****************************************************************************
* Name: ssd1306_cmddata
*
* Description:
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* Select Command/Data mode for SSD1306
*
****************************************************************************/
void ssd1306_cmddata(FAR struct ssd1306_dev_s *priv, bool cmd)
{
/* Select command transfer */
SPI_CMDDATA(priv->spi, SPIDEV_DISPLAY, cmd);
}
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#endif /* CONFIG_LCD_SSD1306 && CONFIG_LCD_SSD1306_SPI */