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- /****************************************************************************
- * 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 */
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