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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"
- #if defined(CONFIG_LCD_SSD1306) && defined(CONFIG_LCD_SSD1306_SPI)
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: ssd1306_configspi
- *
- * Description:
- *
- ****************************************************************************/
- void ssd1306_configspi(FAR struct spi_dev_s *spi)
- {
- lcdinfo("Mode: %d Bits: 8 Frequency: %d\n",
- CONFIG_SSD1306_SPIMODE, CONFIG_SSD1306_FREQUENCY);
- /* 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);
- }
- /****************************************************************************
- * Name: ssd1306_sendbyte
- *
- * Description:
- * Write a value to an 8-bit value to SSD1306
- *
- ****************************************************************************/
- int ssd1306_sendbyte(FAR struct ssd1306_dev_s *priv, uint8_t regval)
- {
- #ifdef CONFIG_LCD_SSD1306_REGDEBUG
- _err("->0x%02x\n", regval);
- #endif
- /* Send byte value to display */
- (void)SPI_SEND(priv->spi, regval);
- return OK;
- }
- /****************************************************************************
- * Name: ssd1306_sendblk
- *
- * Description:
- * Write an array of bytes to SSD1306
- *
- ****************************************************************************/
- int 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);
- return OK;
- }
- /****************************************************************************
- * Name: ssd1306_select
- *
- * Description:
- * 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(0), cs);
- /* If we are deselecting the device */
- if (cs == false)
- {
- /* Unlock bus */
- (void)SPI_LOCK(priv->spi, false);
- }
- }
- /****************************************************************************
- * Name: ssd1306_cmddata
- *
- * Description:
- * 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(0), cmd);
- }
- #endif /* CONFIG_LCD_SSD1306 && CONFIG_LCD_SSD1306_SPI */
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