148 lines
4.2 KiB
C
148 lines
4.2 KiB
C
/****************************************************************************
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* drivers/lcd/ssd1306_spi.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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,
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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(priv->devno), 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(priv->devno), cmd);
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}
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#endif /* CONFIG_LCD_SSD1306 && CONFIG_LCD_SSD1306_SPI */
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