arm/stm32f401rc-rs485: Add support to LCD 16x2 with I2C Backpack

Signed-off-by: Rodrigo Sim [email protected]

Documentation/platforms/arm/stm32f4/boards/stm32f401rc-rs485/index.rst

@@ -699,6 +699,13 @@ Configures the NuttShell (nsh) over USB Serial (check usbserial configuration) a
 BMP280 has an I2C address that can be configure by SDO. Connecting SDO to GND results in slave
 address 0x76, connection it to VDD results in slave address 0x77. This can be configured by enabling BMP280_I2C_ADDR_76 or BMP280_I2C_ADDR_77. This configuration uses I2C1 and slave address 0x77.
 
+======= =====
+SENSOR  PINS
+======= =====
+SDA     PA7
+SCK     PB8
+======= =====
+
 NSH commands::
 
        NuttShell (NSH) NuttX-12.6.0-RC1
@@ -709,4 +716,38 @@ NSH commands::
        Absolute pressure [hPa] = 932.650024
        Temperature [C] = 24.490000
        
-There is a known issue where every time the sensor is initialized, the first measurement is wrong, please check https://github.com/apache/nuttx/issues/12421 for the latest updates on this issue.
+There is a known issue where every time the sensor is initialized, the first measurement is wrong, please check https://github.com/apache/nuttx/issues/12421 for the latest updates on this issue.
+
+lcd1602
+-------
+
+This configuration sets up the NuttShell (NSH) interface over USB Serial (refer to the usbserial
+configuration for details). It also enables I2C1 and the driver for an alphanumeric/segment LCD.
+Specifically, the setup supports a 16x2 LCD screen based on the HD44780 controller, which is
+interfaced using an I2C adapter known as the LCD Backpack, utilizing the PCF8574 chip.
+
+======= =====
+LCD     PINS
+======= =====
+SDA     PA7
+SCK     PB8
+======= =====
+
+NSH commands::
+
+       nsh> slcd "Hello NuttX"
+       Opening /dev/slcd0 for read/write access
+       Attributes:
+         rows: 2 columns: 16 nbars: 0
+         max contrast: 0 max brightness: 1
+       Clear screen
+       WRITING:
+       0000: 1b5b46                                                            .[F 
+       Set brightness to 1
+       Print [Hello NuttX]
+       WRITING:
+       0000: 1b5b471b5b30304c1b5b4548656c6c6f 204e75747458                     .[G.[00L.[EHello  NuttX
+       Test complete
+       nsh> 
+
+       

boards/arm/stm32/stm32f401rc-rs485/configs/lcd1602/defconfig

@@ -0,0 +1,68 @@
+#
+# 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_ARCH_FPU is not set
+# CONFIG_NSH_ARGCAT is not set
+# CONFIG_NSH_CMDOPT_HEXDUMP is not set
+# CONFIG_NSH_DISABLE_IFCONFIG is not set
+# CONFIG_NSH_DISABLE_PS is not set
+CONFIG_ARCH="arm"
+CONFIG_ARCH_BOARD="stm32f401rc-rs485"
+CONFIG_ARCH_BOARD_COMMON=y
+CONFIG_ARCH_BOARD_STM32F401RC_RS485=y
+CONFIG_ARCH_BUTTONS=y
+CONFIG_ARCH_CHIP="stm32"
+CONFIG_ARCH_CHIP_STM32=y
+CONFIG_ARCH_CHIP_STM32F401RC=y
+CONFIG_ARCH_INTERRUPTSTACK=2048
+CONFIG_ARCH_IRQBUTTONS=y
+CONFIG_ARCH_STACKDUMP=y
+CONFIG_BOARDCTL_USBDEVCTRL=y
+CONFIG_BOARD_LOOPSPERMSEC=8499
+CONFIG_BUILTIN=y
+CONFIG_CDCACM=y
+CONFIG_CDCACM_CONSOLE=y
+CONFIG_EXAMPLES_BUTTONS=y
+CONFIG_EXAMPLES_BUTTONS_NAME0="SW3"
+CONFIG_EXAMPLES_BUTTONS_NAME1="SW4"
+CONFIG_EXAMPLES_BUTTONS_NAME2="SW5"
+CONFIG_EXAMPLES_BUTTONS_NAMES=y
+CONFIG_EXAMPLES_BUTTONS_QTD=3
+CONFIG_EXAMPLES_SLCD=y
+CONFIG_HAVE_CXX=y
+CONFIG_HAVE_CXXINITIALIZE=y
+CONFIG_I2C=y
+CONFIG_INIT_ENTRYPOINT="nsh_main"
+CONFIG_INPUT=y
+CONFIG_INPUT_BUTTONS=y
+CONFIG_INPUT_BUTTONS_LOWER=y
+CONFIG_INTELHEX_BINARY=y
+CONFIG_LCD_BACKPACK=y
+CONFIG_NSH_ARCHINIT=y
+CONFIG_NSH_BUILTIN_APPS=y
+CONFIG_NSH_FILEIOSIZE=512
+CONFIG_NSH_LINELEN=64
+CONFIG_NSH_READLINE=y
+CONFIG_PREALLOC_TIMERS=4
+CONFIG_RAM_SIZE=98304
+CONFIG_RAM_START=0x20000000
+CONFIG_RAW_BINARY=y
+CONFIG_RR_INTERVAL=200
+CONFIG_SCHED_WAITPID=y
+CONFIG_SLCD=y
+CONFIG_SPI=y
+CONFIG_START_DAY=5
+CONFIG_START_MONTH=5
+CONFIG_START_YEAR=2014
+CONFIG_STM32_I2C1=y
+CONFIG_STM32_JTAG_SW_ENABLE=y
+CONFIG_STM32_OTGFS=y
+CONFIG_STM32_PWR=y
+CONFIG_STM32_USART6=y
+CONFIG_SYSTEM_NSH=y
+CONFIG_TASK_NAME_SIZE=0
+CONFIG_USBDEV=y

boards/arm/stm32/stm32f401rc-rs485/src/stm32_bringup.c

@@ -79,6 +79,10 @@
 #include "stm32_bmp280.h"
 #endif
 
+#ifdef CONFIG_LCD_BACKPACK
+#include "stm32_lcd_backpack.h"
+#endif
+
 /****************************************************************************
  * Public Functions
  ****************************************************************************/
@@ -313,5 +317,16 @@ int stm32_bringup(void)
     }
 #endif
 
+#ifdef CONFIG_LCD_BACKPACK
+  /* slcd:0, i2c:1, rows=2, cols=16 */
+
+  ret = board_lcd_backpack_init(0, 1, 2, 16);
+  if (ret < 0)
+    {
+      syslog(LOG_ERR, "Failed to initialize PCF8574 LCD, error %d\n", ret);
+      return ret;
+    }
+#endif
+
   return ret;
 }