cpu/atmega8: new cpu

cpu/atmega8/Kconfig

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+# Copyright (c) 2020 HAW Hamburg
+#
+# 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.
+#
+
+config CPU_FAM_ATMEGA8
+    bool
+    select CPU_COMMON_ATMEGA
+
+## CPU Models
+config CPU_MODEL_ATMEGA8
+    bool
+    select CPU_FAM_ATMEGA8
+    select HAS_CPU_ATMEGA8
+
+## Definition of specific features
+config HAS_CPU_ATMEGA8
+    bool
+    help
+        Indicates that a 'atmega8' cpu is being used.
+
+## Common CPU symbols
+config CPU_FAM
+    default "atmega8" if CPU_FAM_ATMEGA8
+
+config CPU_MODEL
+    default "atmega8" if CPU_MODEL_ATMEGA8
+
+config CPU
+    default "atmega8" if CPU_FAM_ATMEGA8
+
+source "$(RIOTCPU)/atmega_common/Kconfig"

cpu/atmega8/Makefile

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+# define the module that is build
+MODULE = cpu
+
+# add a list of subdirectories, that should also be build
+DIRS = $(RIOTCPU)/atmega_common/
+
+include $(RIOTBASE)/Makefile.base

cpu/atmega8/Makefile.dep

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+include $(RIOTCPU)/atmega_common/Makefile.dep

cpu/atmega8/Makefile.features

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+include $(RIOTCPU)/atmega_common/Makefile.features

cpu/atmega8/Makefile.include

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+RAM_LEN = 1K
+ROM_LEN = 8K
+
+LINKER_SCRIPT ?= avr4.ld
+
+# CPU depends on the atmega common module, so include it
+include $(RIOTCPU)/atmega_common/Makefile.include

cpu/atmega8/doc.txt

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+/**
+ * @defgroup        cpu_atmega8 Atmel ATmega8
+ * @ingroup         cpu
+ * @brief           Implementation of Atmel's ATmega8 MCU
+ */
+
+/**
+ * @defgroup        cpu_atmega8_definitions Atmel ATmega8 Definitions
+ * @ingroup         cpu_atmega8
+ */

cpu/atmega8/include/cpu_conf.h

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+/*
+ * Copyright (C) 2014 Freie Universität Berlin, Hinnerk van Bruinehsen
+ *               2017 RWTH Aachen, Josua Arndt
+ *               2018 Matthew Blue
+ *               2023 Hugues Larrive
+ *
+ * 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         cpu_atmega_common
+ * @{
+ *
+ * @file
+ * @brief           Implementation specific CPU configuration options
+ *
+ * @author          Hauke Petersen <hauke.petersen@fu-berlin.de>
+ * @author          Hinnerk van Bruinehsen <h.v.bruinehsen@fu-berlin.de>
+ * @author          Josua Arndt <jarndt@ias.rwth-aachen.de>
+ * @author          Steffen Robertz <steffen.robertz@rwth-aachen.de>
+ * @author          Matthew Blue <matthew.blue.neuro@gmail.com>
+ * @author          Hugues Larrive <hugues.larrive@pm.me>
+ */
+
+#ifndef CPU_CONF_H
+#define CPU_CONF_H
+
+#include "atmega_regs_common.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef THREAD_EXTRA_STACKSIZE_PRINTF
+#define THREAD_EXTRA_STACKSIZE_PRINTF    (64)
+#endif
+
+/**
+ * @name           Kernel configuration
+ *
+ *                 Since printf seems to get memory allocated by the
+ *                 linker/avr-libc the stack size tested successfully
+ *                 even with pretty small stacks.
+ * @{
+ */
+#ifndef THREAD_STACKSIZE_DEFAULT
+#define THREAD_STACKSIZE_DEFAULT   (128)
+#endif
+
+/* keep THREAD_STACKSIZE_IDLE > THREAD_EXTRA_STACKSIZE_PRINTF
+ * to avoid not printing of debug in interrupts
+ */
+#ifndef THREAD_STACKSIZE_IDLE
+#if MODULE_XTIMER || MODULE_ZTIMER || MODULE_ZTIMER64
+/* For AVR no ISR stack is used, hence an IRQ will victimize the stack of
+ * whatever thread happens to be running with the IRQ kicks in. If more than
+ * trivial stuff is needed to be done in ISRs (e.g. when soft timers are used),
+ * the idle stack will overflow.
+ */
+#define THREAD_STACKSIZE_IDLE      (192)
+#else
+#define THREAD_STACKSIZE_IDLE      (96)
+#endif
+#endif
+/** @} */
+
+/**
+ * @brief   Attribute for memory sections required by SRAM PUF
+ */
+#define PUF_SRAM_ATTRIBUTES __attribute__((used, section(".noinit")))
+
+/**
+ * @brief   Declare the heap_stats function as available
+ */
+#define HAVE_HEAP_STATS
+
+/**
+ * @brief   This arch uses the inlined IRQ API.
+ */
+#define IRQ_API_INLINED     (1)
+
+#ifndef DOXYGEN
+#define HAS_FLASH_UTILS_ARCH    1
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* CPU_CONF_H */
+/** @} */

cpu/atmega8/include/default_timer_config.h

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+/*
+ * Copyright (C) 2015 HAW Hamburg
+ *               2016 Freie Universität Berlin
+ *               2023 Hugues Larrive
+ *
+ * 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         cpu_atmega8
+ * @{
+ *
+ * @file
+ * @brief           Default timer configuration
+ *
+ * @author          René Herthel <rene-herthel@outlook.de>
+ * @author          Hauke Petersen <hauke.petersen@fu-berlin.de>
+ * @author          Hugues Larrive <hugues.larrive@pm.me>
+ */
+
+#ifndef DEFAULT_TIMER_CONFIG_H
+#define DEFAULT_TIMER_CONFIG_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef TIMER_NUMOF
+#define TIMER_NUMOF         (1U)
+#define TIMER_CHANNEL_NUMOF (2)
+
+#define TIMER_0             MEGA_TIMER1
+#define TIMER_0_MASK        &TIMSK
+#define TIMER_0_FLAG        &TIFR
+#define TIMER_0_ISRA        TIMER1_COMPA_vect
+#define TIMER_0_ISRB        TIMER1_COMPB_vect
+#endif /* TIMER_NUMOF */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* DEFAULT_TIMER_CONFIG_H */
+/** @} */

cpu/atmega8/include/periph_cpu.h

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+/*
+ * Copyright (C) 2015 HAW Hamburg
+ *               2016 Freie Universität Berlin
+ *               2023 Hugues Larrive
+ *
+ * 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         cpu_atmega8
+ * @{
+ *
+ * @file
+ * @brief           CPU specific definitions for internal peripheral handling
+ *
+ * @author          René Herthel <rene-herthel@outlook.de>
+ * @author          Hauke Petersen <hauke.petersen@fu-berlin.de>
+ * @author          Hugues Larrive <hugues.larrive@pm.me>
+ */
+
+#ifndef PERIPH_CPU_H
+#define PERIPH_CPU_H
+
+#include "periph_cpu_common.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief   Define a CPU specific GPIO pin generator macro
+ */
+#define GPIO_PIN(x, y)          ((x << 4) | y)
+
+/**
+ * @brief   Available ports on the ATmega8 family
+ */
+enum {
+    PORT_B = 1,       /**< port B */
+    PORT_C = 2,       /**< port C */
+    PORT_D = 3        /**< port D */
+};
+
+/**
+ * @brief   Available external interrupt pins on the ATmega8 family
+ *
+ * In order of their interrupt number.
+ */
+#define CPU_ATMEGA_EXT_INTS    { GPIO_PIN(PORT_D, 2), \
+                                 GPIO_PIN(PORT_D, 3) }
+
+/**
+ * @brief   Get the interrupt vector number of the given GPIO pin
+ */
+static inline uint8_t atmega_pin2exti(uint8_t port_num, uint8_t pin_num)
+{
+    (void)port_num;
+    return pin_num - 2;
+}
+
+/**
+ * @brief   Check if the given pin can be used as external interrupt
+ */
+static inline bool atmega_has_pin_exti(uint8_t port_num, uint8_t pin_num)
+{
+    if (port_num == PORT_D) {
+        return ((pin_num == 2) || (pin_num == 3));
+    }
+
+    return false;
+}
+
+/**
+ * @name   Defines for the I2C interface
+ * @{
+ */
+#define I2C_PORT_REG            PORTC
+#define I2C_PIN_MASK            (1 << PORTC4) | (1 << PORTC5)
+/** @} */
+
+/**
+ * @name    EEPROM configuration
+ * @{
+ */
+#define EEPROM_SIZE                (512U)  /* 512B */
+/** @} */
+
+#ifdef __cplusplus
+}
+#endif
+
+#include "periph_conf.h"
+#include "default_timer_config.h"
+
+#endif /* PERIPH_CPU_H */
+/** @} */