144 lines
4.6 KiB
C
144 lines
4.6 KiB
C
/****************************************************************************
|
|
* drivers/lcd/ssd1306_i2c.c
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership. The
|
|
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
* License for the specific language governing permissions and limitations
|
|
* under the License.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* 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"
|
|
|
|
#if defined(CONFIG_LCD_SSD1306) && defined(CONFIG_LCD_SSD1306_I2C)
|
|
|
|
/****************************************************************************
|
|
* 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.
|
|
*/
|
|
|
|
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 */
|
|
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)
|
|
{
|
|
struct i2c_msg_s msg[2];
|
|
uint8_t transfer_mode;
|
|
int ret;
|
|
|
|
/* 8-bit data read sequence:
|
|
*
|
|
* Start - I2C_Write_Address - Data transfer select - SSD1306_Write_Data
|
|
* - STOP
|
|
*/
|
|
|
|
/* Send the SSD1306 register address (with no STOP) */
|
|
|
|
transfer_mode = 0x40; /* Select data transfer */
|
|
|
|
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 */
|
|
msg[0].buffer = &transfer_mode; /* Transfer mode send */
|
|
msg[0].length = 1; /* Send the one byte register address */
|
|
|
|
/* Followed by the SSD1306 write data (with no RESTART, then STOP) */
|
|
|
|
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 */
|
|
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;
|
|
}
|
|
|
|
#endif /* CONFIG_LCD_SSD1306 &7 CONFIG_LCD_SSD1306_I2C */
|