boards/esp32s2-saola-1: Add button driver support

boards/xtensa/esp32s2/esp32s2-saola-1/configs/buttons/defconfig

@@ -0,0 +1,52 @@
+#
+# 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_LEDS is not set
+# CONFIG_NSH_ARGCAT is not set
+# CONFIG_NSH_CMDOPT_HEXDUMP is not set
+# CONFIG_NSH_CMDPARMS is not set
+CONFIG_ARCH="xtensa"
+CONFIG_ARCH_BOARD="esp32s2-saola-1"
+CONFIG_ARCH_BOARD_COMMON=y
+CONFIG_ARCH_BOARD_ESP32S2_SAOLA_1=y
+CONFIG_ARCH_BUTTONS=y
+CONFIG_ARCH_CHIP="esp32s2"
+CONFIG_ARCH_CHIP_ESP32S2=y
+CONFIG_ARCH_CHIP_ESP32S2WROVER=y
+CONFIG_ARCH_IRQBUTTONS=y
+CONFIG_ARCH_STACKDUMP=y
+CONFIG_ARCH_XTENSA=y
+CONFIG_BOARD_LOOPSPERMSEC=16717
+CONFIG_BUILTIN=y
+CONFIG_ESP32S2_GPIO_IRQ=y
+CONFIG_ESP32S2_UART0=y
+CONFIG_EXAMPLES_BUTTONS=y
+CONFIG_FS_PROCFS=y
+CONFIG_HAVE_CXX=y
+CONFIG_HAVE_CXXINITIALIZE=y
+CONFIG_IDLETHREAD_STACKSIZE=3072
+CONFIG_INIT_ENTRYPOINT="nsh_main"
+CONFIG_INPUT=y
+CONFIG_INPUT_BUTTONS=y
+CONFIG_INPUT_BUTTONS_LOWER=y
+CONFIG_INTELHEX_BINARY=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=114688
+CONFIG_RAM_START=0x20000000
+CONFIG_RR_INTERVAL=200
+CONFIG_SCHED_WAITPID=y
+CONFIG_SPI=y
+CONFIG_START_DAY=6
+CONFIG_START_MONTH=12
+CONFIG_START_YEAR=2011
+CONFIG_SYSTEM_NSH=y
+CONFIG_UART0_SERIAL_CONSOLE=y

boards/xtensa/esp32s2/esp32s2-saola-1/include/board.h

@@ -43,6 +43,13 @@
 #  define BOARD_CLOCK_FREQUENCY 80000000
 #endif
 
+/* Button definitions *******************************************************/
+
+#define BUTTON_BTN1                 0 /* BUTTON_BOOT */
+#define BUTTON_BTN1_BIT             (1 << BUTTON_BTN1)
+
+#define NUM_BUTTONS                 1
+
 /* LED definitions **********************************************************/
 
 /* Define how many LEDs this board has (needed by userleds) */

boards/xtensa/esp32s2/esp32s2-saola-1/src/Make.defs

@@ -49,6 +49,10 @@ ifeq ($(CONFIG_ESP32S2_SPI),y)
 CSRCS += esp32s2_board_spi.c
 endif
 
+ifeq ($(CONFIG_ARCH_BUTTONS),y)
+CSRCS += esp32s2_buttons.c
+endif
+
 DEPPATH += --dep-path board
 VPATH += :board
 CFLAGS += $(shell $(INCDIR) "$(CC)" $(TOPDIR)$(DELIM)arch$(DELIM)$(CONFIG_ARCH)$(DELIM)src$(DELIM)board$(DELIM)board)

boards/xtensa/esp32s2/esp32s2-saola-1/src/esp32s2_bringup.c

@@ -221,6 +221,16 @@ int esp32s2_bringup(void)
     }
 #endif
 
+#ifdef CONFIG_INPUT_BUTTONS
+  /* Register the BUTTON driver */
+
+  ret = btn_lower_initialize("/dev/buttons");
+  if (ret < 0)
+    {
+      syslog(LOG_ERR, "ERROR: btn_lower_initialize() failed: %d\n", ret);
+    }
+#endif
+
 #ifdef CONFIG_SENSORS_MAX6675
   ret = board_max6675_initialize(0, 2);
   if (ret < 0)

boards/xtensa/esp32s2/esp32s2-saola-1/src/esp32s2_buttons.c

@@ -0,0 +1,167 @@
+/****************************************************************************
+ * boards/xtensa/esp32s2/esp32s2-saola-1/src/esp32s2_buttons.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 <assert.h>
+#include <debug.h>
+#include <errno.h>
+#include <stdbool.h>
+#include <stdio.h>
+
+#include <nuttx/arch.h>
+#include <arch/board/board.h>
+#include <nuttx/board.h>
+#include <nuttx/irq.h>
+#include <arch/irq.h>
+
+#include "esp32s2_gpio.h"
+
+#include "esp32s2-saola-1.h"
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: board_button_initialize
+ *
+ * Description:
+ *   board_button_initialize() must be called to initialize button resources.
+ *   After that, board_buttons() may be called to collect the current state
+ *   of all buttons or board_button_irq() may be called to register button
+ *   interrupt handlers.
+ *
+ ****************************************************************************/
+
+uint32_t board_button_initialize(void)
+{
+  esp32s2_configgpio(BUTTON_BOOT, INPUT_FUNCTION_3 | PULLUP);
+  return NUM_BUTTONS;
+}
+
+/****************************************************************************
+ * Name: board_buttons
+ *
+ * Description:
+ *   After board_button_initialize() has been called, board_buttons() may be
+ *   called to collect the state of all buttons.  board_buttons() returns an
+ *   8-bit bit set with each bit associated with a button.  See the
+ *   BUTTON_*_BIT  definitions in board.h for the meaning of each bit.
+ *
+ ****************************************************************************/
+
+uint32_t board_buttons(void)
+{
+  uint8_t ret = 0;
+  int i = 0;
+  int n = 0;
+
+  bool b0 = esp32s2_gpioread(BUTTON_BOOT);
+
+  for (i = 0; i < 10; i++)
+    {
+      up_mdelay(1); /* TODO */
+
+      bool b1 = esp32s2_gpioread(BUTTON_BOOT);
+
+      if (b0 == b1)
+        {
+          n++;
+        }
+      else
+        {
+          n = 0;
+        }
+
+      if (3 == n)
+        {
+          break;
+        }
+
+      b0 = b1;
+    }
+
+  iinfo("b=%d n=%d\n", b0, n);
+
+  /* Low value means that the button is pressed */
+
+  if (!b0)
+    {
+      ret = 0x1;
+    }
+
+  return ret;
+}
+
+/****************************************************************************
+ * Name: board_button_irq
+ *
+ * Description:
+ *   board_button_irq() may be called to register an interrupt handler that
+ *   will be called when a button is depressed or released.  The ID value is
+ *   a button enumeration value that uniquely identifies a button resource.
+ *   See the BUTTON_* definitions in board.h for the meaning of enumeration
+ *   value.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_ARCH_IRQBUTTONS
+int board_button_irq(int id, xcpt_t irqhandler, void *arg)
+{
+  int ret;
+  DEBUGASSERT(id == 0);
+
+  int irq = ESP32S2_PIN2IRQ(BUTTON_BOOT);
+
+  if (NULL != irqhandler)
+    {
+      /* Make sure the interrupt is disabled */
+
+      esp32s2_gpioirqdisable(irq);
+
+      ret = irq_attach(irq, irqhandler, arg);
+      if (ret < 0)
+        {
+          syslog(LOG_ERR, "ERROR: irq_attach() failed: %d\n", ret);
+          return ret;
+        }
+
+      gpioinfo("Attach %p\n", irqhandler);
+
+      gpioinfo("Enabling the interrupt\n");
+
+      /* Configure the interrupt for rising and falling edges */
+
+      esp32s2_gpioirqenable(irq, GPIO_INTR_ANYEDGE);
+    }
+  else
+    {
+      gpioinfo("Disable the interrupt\n");
+      esp32s2_gpioirqdisable(irq);
+    }
+
+  return OK;
+}
+#endif