boards/atmega328p-xplained-mini: Add BTN0 and LED0

The board have one user button and a user led but are not enabled.
This add necessary support to use the button and the led. It include
the configs to use with SAUL and button interrupt.

Signed-off-by: Gerson Fernando Budke <nandojve@gmail.com>

boards/atmega328p-xplained-mini/Kconfig

@@ -1,5 +1,5 @@
 # Copyright (c) 2020 HAW Hamburg
-# Copyright (c) 2021 Gerson Fernando Budke
+# Copyright (c) 2021-2023 Gerson Fernando Budke
 #
 # This file is subject to the terms and conditions of the GNU Lesser
 # General Public License v2.1. See the file LICENSE in the top level
@@ -21,7 +21,9 @@ config BOARD_ATMEGA328P_XPLAINED_MINI
     select HAS_PERIPH_SPI
     select HAS_PERIPH_TIMER
     select HAS_PERIPH_UART
-    # Various other features (if any)
+
+    select HAVE_SAUL_GPIO
     select MODULE_BOARDS_COMMON_ATMEGA if TEST_KCONFIG
+    select MODULE_ATMEGA_PCINT0 if TEST_KCONFIG
 
 source "$(RIOTBOARD)/common/atmega/Kconfig"

boards/atmega328p-xplained-mini/Makefile.dep

@@ -1 +1,6 @@
 USEMODULE += boards_common_atmega
+USEMODULE += atmega_pcint0
+
+ifneq (,$(filter saul_default,$(USEMODULE)))
+  USEMODULE += saul_gpio
+endif

boards/atmega328p-xplained-mini/include/board.h

@@ -2,7 +2,7 @@
  * Copyright (C) 2014 Freie Universität Berlin, Hinnerk van Bruinehsen
  *               2016 Laurent Navet <laurent.navet@gmail.com>
  *               2019 Otto-von-Guericke-Universität Magdeburg
- *               2021 Gerson Fernando Budke
+ *               2021-2123 Gerson Fernando Budke
  *
  * This file is subject to the terms and conditions of the GNU Lesser
  * General Public License v2.1. See the file LICENSE in the top level
@@ -55,6 +55,27 @@ extern "C" {
 #define XTIMER_BACKOFF              (40)
 /** @} */
 
+/**
+ * @name    Macros for controlling the on-board LED
+ * @{
+ */
+#define LED0_PIN            GPIO_PIN(PORT_B, 5)
+#define LED0_MODE           GPIO_OUT
+#define LED0_ENABLE_PORT    DDRB  |=  LED0_PIN
+#define LED0_ON             PORTB |=  LED0_PIN
+#define LED0_OFF            PORTB &= ~LED0_PIN
+#define LED0_TOGGLE         PORTB ^=  LED0_PIN
+/** @} */
+
+/**
+ * @name    Button pin configuration
+ * @{
+ */
+#define BTN0_PIN            GPIO_PIN(PORT_B, 7)
+#define BTN0_MODE           GPIO_IN_PU
+#define BTN0_INT_FLANK      GPIO_FALLING
+/** @} */
+
 #ifdef __cplusplus
 }
 #endif

boards/atmega328p-xplained-mini/include/gpio_params.h

@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2023 Gerson Fernando Budke
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup     boards_atmega328p_xplained_mini
+ * @{
+ *
+ * @file
+ * @brief       Configuration of SAUL mapped GPIO pins
+ *
+ * @author      Gerson Fernando Budke <nandojve@gmail.com>
+ */
+
+#ifndef GPIO_PARAMS_H
+#define GPIO_PARAMS_H
+
+#include "board.h"
+#include "saul/periph.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief   GPIO configuration
+ */
+static const  saul_gpio_params_t saul_gpio_params[] =
+{
+    {
+        .name = "BTN0 (SW0)",
+        .pin  = BTN0_PIN,
+        .mode = BTN0_MODE,
+        .flags = SAUL_GPIO_INVERTED,
+    },
+    {
+        .name = "LED0 (Yellow)",
+        .pin = LED0_PIN,
+        .mode = LED0_MODE,
+        .flags = (SAUL_GPIO_INIT_CLEAR),
+    },
+};
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* GPIO_PARAMS_H */
+/** @} */