6a3c2aded6
* Simplify EINTR/ECANCEL error handling 1. Add semaphore uninterruptible wait function 2 .Replace semaphore wait loop with a single uninterruptible wait 3. Replace all sem_xxx to nxsem_xxx * Unify the void cast usage 1. Remove void cast for function because many place ignore the returned value witout cast 2. Replace void cast for variable with UNUSED macro
162 lines
4.9 KiB
C
162 lines
4.9 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 <nuttx/spi/spi.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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* Public 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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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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SPI_HWFEATURES(spi, 0);
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SPI_SETFREQUENCY(spi, CONFIG_SSD1306_FREQUENCY);
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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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int 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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SPI_SEND(priv->spi, regval);
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return OK;
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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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int 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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SPI_SNDBLOCK(priv->spi, data, len);
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return OK;
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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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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(0), 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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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(0), cmd);
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}
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#endif /* CONFIG_LCD_SSD1306 && CONFIG_LCD_SSD1306_SPI */
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