99 lines
3.2 KiB
C
99 lines
3.2 KiB
C
/****************************************************************************
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* boards/xtensa/esp32/common/src/esp32_lcd_backpack.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 <errno.h>
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#include <debug.h>
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#include <syslog.h>
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#include <stdio.h>
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#include <nuttx/i2c/i2c_master.h>
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#include <nuttx/lcd/pcf8574_lcd_backpack.h>
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#include "esp32_board_i2c.h"
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#include "esp32_i2c.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: board_lcd_backpack_init
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*
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* Description:
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* Initialize the LCD1602 display controlled by Backpack with PCF8574
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*
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* Input Parameters:
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* devpath - The full path to the driver to register. E.g., "/dev/slcd0"
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*
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* Returned Value:
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* Zero (OK) on success; a negated errno value on failure.
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*
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****************************************************************************/
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int board_lcd_backpack_init(int devno, int busno, int rows, int cols)
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{
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struct pcf8574_lcd_backpack_config_s cfg =
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LCD_I2C_BACKPACK_CFG_SAINSMART;
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struct i2c_master_s *i2c;
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char devpath[12];
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int ret;
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/* Setup the LCD row and cols size.
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* Note: We are using the LCD_I2C_BACKPACK_CFG_SAINSMART config that
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* defined the I2C Address to 0x27 to PCF8574. Double check if all
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* the bits (pins) from PCF8574 connected to the LCD controller
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* are correct with this LCD CFG definition.
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*/
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cfg.rows = rows;
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cfg.cols = cols;
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/* Initialize the I2C1 */
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i2c = esp32_i2cbus_initialize(busno);
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if (i2c == NULL)
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{
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return -ENODEV;
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}
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/* Register the Segment LCD */
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snprintf(devpath, 12, "/dev/slcd%d", devno);
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ret = pcf8574_lcd_backpack_register(devpath, i2c, &cfg);
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if (ret < 0)
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{
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lcderr("ERROR: pcf8574_lcd_backpack_register(%s) failed: %d\n",
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devpath, ret);
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return ret;
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}
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return OK;
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}
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