nuttx/drivers/lcd/ssd1306_i2c.c

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/****************************************************************************
* drivers/lcd/ssd1306_i2c.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 <string.h>
#include <nuttx/kmalloc.h>
#include <nuttx/i2c/i2c_master.h>
#include <nuttx/lcd/ssd1306.h>
#include "ssd1306.h"
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#if defined(CONFIG_LCD_SSD1306) && defined(CONFIG_LCD_SSD1306_I2C)
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/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: ssd1306_sendbyte
*
* Description:
* Write an 8-bit value into SSD1306
*
****************************************************************************/
int ssd1306_sendbyte(FAR struct ssd1306_dev_s *priv, uint8_t regval)
{
/* 8-bit data read sequence:
*
* Start - I2C_Write_Address - SSD1306_Reg_Address - SSD1306_Write_Data
* - STOP
*/
struct i2c_msg_s msg;
uint8_t txbuffer[2];
int ret;
#ifdef CONFIG_LCD_SSD1306_REGDEBUG
_err("-> 0x%02x\n", regval);
#endif
/* Setup to the data to be transferred. Two bytes: The SSD1306 register
* address followed by one byte of data.
*/
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txbuffer[0] = 0x00;
txbuffer[1] = regval;
/* Setup 8-bit SSD1306 address write message */
msg.frequency = CONFIG_SSD1306_I2CFREQ; /* I2C frequency */
msg.addr = priv->addr; /* 7-bit address */
msg.flags = 0; /* Write transaction, beginning with START */
msg.buffer = txbuffer; /* Transfer from this address */
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msg.length = 2; /* Send two bytes following the address
* then STOP */
/* Perform the transfer */
ret = I2C_TRANSFER(priv->i2c, &msg, 1);
if (ret < 0)
{
lcderr("ERROR: I2C_TRANSFER failed: %d\n", ret);
}
return ret;
}
/****************************************************************************
* 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)
{
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struct i2c_msg_s msg[2];
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uint8_t transfer_mode;
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int ret;
/* 8-bit data read sequence:
*
* Start - I2C_Write_Address - Data transfer select - SSD1306_Write_Data
* - STOP
*/
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/* Send the SSD1306 register address (with no STOP) */
transfer_mode = 0x40; /* Select data transfer */
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msg[0].frequency = CONFIG_SSD1306_I2CFREQ; /* I2C frequency */
msg[0].addr = priv->addr; /* 7-bit address */
msg[0].flags = I2C_M_NOSTOP; /* Write transaction, beginning with START */
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msg[0].buffer = &transfer_mode; /* Transfer mode send */
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msg[0].length = 1; /* Send the one byte register address */
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/* Followed by the SSD1306 write data (with no RESTART, then STOP) */
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msg[1].frequency = CONFIG_SSD1306_I2CFREQ; /* I2C frequency */
msg[1].addr = priv->addr; /* 7-bit address */
msg[1].flags = I2C_M_NOSTART; /* Write transaction with no RESTART */
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msg[1].buffer = data; /* Transfer from this address */
msg[1].length = len; /* Send the data, then STOP */
ret = I2C_TRANSFER(priv->i2c, msg, 2);
if (ret < 0)
{
lcderr("ERROR: I2C_TRANSFER failed: %d\n", ret);
}
return ret;
}
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#endif /* CONFIG_LCD_SSD1306 &7 CONFIG_LCD_SSD1306_I2C */