added PCF8574 backpack support

added PCF8574 backpack support

added PCF8574 backpack support

added PCF8574 backpack support

boards/arm/rp2040/common/include/rp2040_lcd_backpack.h

@@ -0,0 +1,83 @@
+/****************************************************************************
+ * boards/arm/rp2040/common/include/rp2040_lcd_backpack.h
+ *
+ * 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.
+ *
+ ****************************************************************************/
+
+#ifndef __RP2040_LCD_BACKPACK_H
+#define __RP2040_LCD_BACKPACK_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Type Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+#ifdef __cplusplus
+#define EXTERN extern "C"
+extern "C"
+{
+#else
+#define EXTERN extern
+#endif
+
+/****************************************************************************
+ * Inline Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: board_lcd_backpack_init
+ *
+ * Description:
+ *   Initialize the LCD1602 display controlled by Backpack with PCF8574
+ *
+ * Input Parameters:
+ *   devpath - The full path to the driver to register. E.g., "/dev/slcd0"
+ *
+ * Returned Value:
+ *   Zero (OK) on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+int board_lcd_backpack_init(int devno, int busno, int rows, int cols);
+
+#undef EXTERN
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __RP2040_LCD_BACKPACK_H */

boards/arm/rp2040/common/src/Make.defs

@@ -62,6 +62,10 @@ ifeq ($(CONFIG_ENC28J60),y)
   CSRCS += rp2040_enc28j60.c
 endif
 
+ifeq ($(CONFIG_LCD_BACKPACK),y)
+  CSRCS += rp2040_lcd_backpack.c
+endif
+
 DEPPATH += --dep-path src
 VPATH += :src
 CFLAGS += $(shell $(INCDIR) "$(CC)" $(TOPDIR)$(DELIM)arch$(DELIM)$(CONFIG_ARCH)$(DELIM)src$(DELIM)board$(DELIM)src)

boards/arm/rp2040/common/src/rp2040_lcd_backpack.c

@@ -0,0 +1,99 @@
+/****************************************************************************
+ * boards/arm/rp2040/common/src/rp2040_lcd_backpack.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 <errno.h>
+#include <debug.h>
+#include <syslog.h>
+#include <stdio.h>
+
+#include <nuttx/board.h>
+#include <nuttx/lcd/lcd.h>
+#include <nuttx/lcd/pcf8574_lcd_backpack.h>
+#include <nuttx/i2c/i2c_master.h>
+
+#include "rp2040_i2c.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: board_lcd_backpack_init
+ *
+ * Description:
+ *   Initialize the LCD1602 display controlled by Backpack with PCF8574
+ *
+ * Input Parameters:
+ *   devpath - The full path to the driver to register. E.g., "/dev/slcd0"
+ *
+ * Returned Value:
+ *   Zero (OK) on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+int board_lcd_backpack_init(int devno, int busno, int rows, int cols)
+{
+  FAR struct pcf8574_lcd_backpack_config_s cfg =
+             LCD_I2C_BACKPACK_CFG_ROBOT;
+  FAR struct i2c_master_s *i2c;
+  char devpath[12];
+  int ret;
+
+  /* Setup the LCD row and cols size.
+   * Note: We are using the LCD_I2C_BACKPACK_CFG_SAINSMART config that
+   *       defined the I2C Address to 0x27 to PCF8574. Double check if all
+   *       the bits (pins) from PCF8574 connected to the LCD controller
+   *       are correct with this LCD CFG definition.
+   */
+
+  cfg.rows = rows;
+  cfg.cols = cols;
+
+  /* Initialize the I2C0 */
+
+  i2c = rp2040_i2cbus_initialize(busno);
+  if (i2c == NULL)
+    {
+      return -ENODEV;
+    }
+
+  /* Regiter the Segment LCD */
+
+  snprintf(devpath, 12, "/dev/slcd%d", devno);
+  ret = pcf8574_lcd_backpack_register(devpath, i2c, &cfg);
+  if (ret < 0)
+    {
+      lcderr("ERROR: pcf8574_lcd_backpack_register(%s) failed: %d\n",
+             devpath, ret);
+      return ret;
+    }
+
+  return OK;
+}

boards/arm/rp2040/raspberrypi-pico/README.txt

@@ -84,6 +84,14 @@ Defconfigs
            SDA ----- GP4 (I2C0 SDA) (Pin 6)
            SCL ----- GP5 (I2C0 SCL) (Pin 7)
            
+- lcd1602 
+    LCD 1602 Segment LCD Disaply (I2C)
+    Connection:
+    PCF8574 BackPack Raspberry Pi Pico
+           GND ----- GND            (Pin 3 or 38 or ...)
+           VCC ----- 5V Vbus        (Pin 40)
+           SDA ----- GP4 (I2C0 SDA) (Pin 6)
+           SCL ----- GP5 (I2C0 SCL) (Pin 7)
 - spisd
     SD card support (SPI connection)
     Connection:

boards/arm/rp2040/raspberrypi-pico/configs/lcd1602/defconfig

@@ -0,0 +1,60 @@
+#
+# This file is autogenerated: PLEASE DO NOT EDIT IT.
+#
+# You can use "make menuconfig" to make any modifications to the installed .config file.
+# You can then do "make savedefconfig" to generate a new defconfig file that includes your
+# modifications.
+#
+# CONFIG_FS_PROCFS_EXCLUDE_ENVIRON is not set
+# CONFIG_LIBC_LONG_LONG is not set
+# CONFIG_NSH_ARGCAT is not set
+# CONFIG_NSH_CMDOPT_HEXDUMP is not set
+# CONFIG_NSH_DISABLE_DATE is not set
+# CONFIG_NSH_DISABLE_LOSMART is not set
+# CONFIG_NSH_DISABLE_PRINTF is not set
+# CONFIG_NSH_DISABLE_TRUNCATE is not set
+# CONFIG_STANDARD_SERIAL is not set
+CONFIG_ARCH="arm"
+CONFIG_ARCH_BOARD="raspberrypi-pico"
+CONFIG_ARCH_BOARD_RASPBERRYPI_PICO=y
+CONFIG_ARCH_CHIP="rp2040"
+CONFIG_ARCH_CHIP_RP2040=y
+CONFIG_ARCH_RAMVECTORS=y
+CONFIG_ARCH_STACKDUMP=y
+CONFIG_BOARDCTL_RESET=y
+CONFIG_BOARD_LOOPSPERMSEC=10450
+CONFIG_BUILTIN=y
+CONFIG_DEBUG_FULLOPT=y
+CONFIG_DEBUG_SYMBOLS=y
+CONFIG_DISABLE_POSIX_TIMERS=y
+CONFIG_EXAMPLES_HELLO=y
+CONFIG_EXAMPLES_SLCD=y
+CONFIG_FS_PROCFS=y
+CONFIG_FS_PROCFS_REGISTER=y
+CONFIG_LCD_BACKPACK=y
+CONFIG_LCD_LCD1602=y
+CONFIG_MAX_TASKS=8
+CONFIG_NFILE_DESCRIPTORS_PER_BLOCK=6
+CONFIG_NSH_ARCHINIT=y
+CONFIG_NSH_BUILTIN_APPS=y
+CONFIG_NSH_READLINE=y
+CONFIG_RAM_SIZE=270336
+CONFIG_RAM_START=0x20000000
+CONFIG_READLINE_CMD_HISTORY=y
+CONFIG_RP2040_I2C0=y
+CONFIG_RP2040_I2C0_GPIO=4
+CONFIG_RP2040_I2C=y
+CONFIG_RP2040_I2C_DRIVER=y
+CONFIG_RR_INTERVAL=200
+CONFIG_SCHED_WAITPID=y
+CONFIG_SDCLONE_DISABLE=y
+CONFIG_SLCD=y
+CONFIG_START_DAY=9
+CONFIG_START_MONTH=2
+CONFIG_START_YEAR=2021
+CONFIG_SYSLOG_CONSOLE=y
+CONFIG_SYSTEM_NSH=y
+CONFIG_TESTING_GETPRIME=y
+CONFIG_TESTING_OSTEST=y
+CONFIG_UART0_SERIAL_CONSOLE=y
+CONFIG_USER_ENTRYPOINT="nsh_main"

boards/arm/rp2040/raspberrypi-pico/src/rp2040_bringup.c

@@ -33,6 +33,10 @@
 
 #include "rp2040_pico.h"
 
+#ifdef CONFIG_LCD_BACKPACK
+#   include "rp2040_lcd_backpack.h"
+#endif
+
 #ifdef CONFIG_VIDEO_FB
 #  include <nuttx/video/fb.h>
 #endif
@@ -134,6 +138,17 @@ int rp2040_bringup(void)
     }
 #endif
 
+#ifdef CONFIG_LCD_BACKPACK
+  /* slcd:0, i2c:0, rows=2, cols=16 */
+
+  ret = board_lcd_backpack_init(0, 0, 2, 16);
+  if (ret < 0)
+    {
+      syslog(LOG_ERR, "Failed to initialize PCF8574 LCD, error %d\n", ret);
+      return ret;
+    }
+#endif
+
 #ifdef CONFIG_RP2040_I2S
   ret = board_i2sdev_initialize(0);
   if (ret < 0)