164 lines
5.1 KiB
C
164 lines
5.1 KiB
C
/****************************************************************************
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* drivers/lcd/ssd1306_spi.c
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*
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* Copyright (C) 2015 Alan Carvalho de Assis. All rights reserved.
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* Author: Alan Carvalho de Assis <acassis@gmail.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <unistd.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/lcd/ssd1306.h>
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#include "ssd1306.h"
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#if defined(CONFIG_LCD_SSD1306) && defined(CONFIG_LCD_SSD1306_SPI)
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: ssd1306_configspi
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*
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* Description:
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*
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****************************************************************************/
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static inline void ssd1306_configspi(FAR struct spi_dev_s *spi)
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{
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lcdinfo("Mode: %d Bits: 8 Frequency: %d\n",
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CONFIG_SSD1306_SPIMODE, CONFIG_SSD1306_FREQUENCY);
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/* Configure SPI for the SSD1306 */
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SPI_SETMODE(spi, CONFIG_SSD1306_SPIMODE);
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SPI_SETBITS(spi, 8);
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(void)SPI_HWFEATURES(spi, 0);
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(void)SPI_SETFREQUENCY(spi, CONFIG_SSD1306_FREQUENCY);
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: ssd1306_sendbyte
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*
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* Description:
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* Write a value to an 8-bit value to SSD1306
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*
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****************************************************************************/
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void ssd1306_sendbyte(FAR struct ssd1306_dev_s *priv, uint8_t regval)
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{
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#ifdef CONFIG_LCD_SSD1306_REGDEBUG
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_err("->0x%02x\n", regval);
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#endif
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/* Send byte value to display */
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(void)SPI_SEND(priv->spi, regval);
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}
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/****************************************************************************
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* Name: ssd1306_sendblk
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*
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* Description:
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* Write an array of bytes to SSD1306
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*
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****************************************************************************/
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void ssd1306_sendblk(FAR struct ssd1306_dev_s *priv, uint8_t *data, uint8_t len)
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{
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/* Send byte value to display */
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(void)SPI_SNDBLOCK(priv, data, len);
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}
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/****************************************************************************
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* Name: ssd1306_select
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*
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* Description:
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* Enable/Disable SSD1306 SPI CS
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*
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****************************************************************************/
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void ssd1306_select(FAR struct ssd1306_dev_s *priv, bool cs)
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{
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/* If we are selecting the device */
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if (cs == true)
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{
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/* If SPI bus is shared then lock and configure it */
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(void)SPI_LOCK(priv->spi, true);
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ssd1306_configspi(priv->spi);
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}
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/* Select/deselect SPI device */
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SPI_SELECT(priv->spi, SPIDEV_DISPLAY, cs);
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/* If we are deselecting the device */
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if (cs == false)
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{
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/* Unlock bus */
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(void)SPI_LOCK(priv->spi, false);
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}
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}
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/****************************************************************************
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* Name: ssd1306_cmddata
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*
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* Description:
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* Select Command/Data mode for SSD1306
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*
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****************************************************************************/
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void ssd1306_cmddata(FAR struct ssd1306_dev_s *priv, bool cmd)
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{
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/* Select command transfer */
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SPI_CMDDATA(priv->spi, SPIDEV_DISPLAY, cmd);
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}
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#endif /* CONFIG_LCD_SSD1306 && CONFIG_LCD_SSD1306_SPI */
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