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19606: doc: add board selection guide r=benpicco a=maribu ### Contribution description This adds a board selection guide to the documentation to aid new users picking good hardware for their use case. 19753: cpu/atmega8: new cpu r=benpicco a=hugueslarrive ### Contribution description Splitted from: - #19740 ### Testing procedure Tested on atmega8 with: - #19755 ### Issues/PRs references Dependencies: - #19752 - #19751 19757: core: fix null pointer dereference r=benpicco a=szsam Check return values of following functions for null: - thread_get - thread_get_unchecked Co-authored-by: Marian Buschsieweke <[email protected]> Co-authored-by: Hugues Larrive <[email protected]> Co-authored-by: Mingjie Shen <[email protected]>
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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. | ||
| # | ||
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| config CPU_FAM_ATMEGA8 | ||
| bool | ||
| select CPU_COMMON_ATMEGA | ||
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| ## CPU Models | ||
| config CPU_MODEL_ATMEGA8 | ||
| bool | ||
| select CPU_FAM_ATMEGA8 | ||
| select HAS_CPU_ATMEGA8 | ||
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| ## Definition of specific features | ||
| config HAS_CPU_ATMEGA8 | ||
| bool | ||
| help | ||
| Indicates that a 'atmega8' cpu is being used. | ||
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| ## Common CPU symbols | ||
| config CPU_FAM | ||
| default "atmega8" if CPU_FAM_ATMEGA8 | ||
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| config CPU_MODEL | ||
| default "atmega8" if CPU_MODEL_ATMEGA8 | ||
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| config CPU | ||
| default "atmega8" if CPU_FAM_ATMEGA8 | ||
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| source "$(RIOTCPU)/atmega_common/Kconfig" |
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| # define the module that is build | ||
| MODULE = cpu | ||
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| # add a list of subdirectories, that should also be build | ||
| DIRS = $(RIOTCPU)/atmega_common/ | ||
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| include $(RIOTBASE)/Makefile.base |
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| include $(RIOTCPU)/atmega_common/Makefile.dep |
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| include $(RIOTCPU)/atmega_common/Makefile.features |
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| RAM_LEN = 1K | ||
| ROM_LEN = 8K | ||
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| LINKER_SCRIPT ?= avr4.ld | ||
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| # CPU depends on the atmega common module, so include it | ||
| include $(RIOTCPU)/atmega_common/Makefile.include |
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| /** | ||
| * @defgroup cpu_atmega8 Atmel ATmega8 | ||
| * @ingroup cpu | ||
| * @brief Implementation of Atmel's ATmega8 MCU | ||
| */ | ||
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| /** | ||
| * @defgroup cpu_atmega8_definitions Atmel ATmega8 Definitions | ||
| * @ingroup cpu_atmega8 | ||
| */ |
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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. | ||
| */ | ||
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| /** | ||
| * @ingroup cpu_atmega_common | ||
| * @{ | ||
| * | ||
| * @file | ||
| * @brief Implementation specific CPU configuration options | ||
| * | ||
| * @author Hauke Petersen <[email protected]> | ||
| * @author Hinnerk van Bruinehsen <[email protected]> | ||
| * @author Josua Arndt <[email protected]> | ||
| * @author Steffen Robertz <[email protected]> | ||
| * @author Matthew Blue <[email protected]> | ||
| * @author Hugues Larrive <[email protected]> | ||
| */ | ||
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| #ifndef CPU_CONF_H | ||
| #define CPU_CONF_H | ||
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| #include "atmega_regs_common.h" | ||
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| #ifdef __cplusplus | ||
| extern "C" { | ||
| #endif | ||
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| #ifndef THREAD_EXTRA_STACKSIZE_PRINTF | ||
| #define THREAD_EXTRA_STACKSIZE_PRINTF (64) | ||
| #endif | ||
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| /** | ||
| * @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 | ||
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| /* 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 | ||
| /** @} */ | ||
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| /** | ||
| * @brief Attribute for memory sections required by SRAM PUF | ||
| */ | ||
| #define PUF_SRAM_ATTRIBUTES __attribute__((used, section(".noinit"))) | ||
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| /** | ||
| * @brief Declare the heap_stats function as available | ||
| */ | ||
| #define HAVE_HEAP_STATS | ||
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| /** | ||
| * @brief This arch uses the inlined IRQ API. | ||
| */ | ||
| #define IRQ_API_INLINED (1) | ||
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| #ifndef DOXYGEN | ||
| #define HAS_FLASH_UTILS_ARCH 1 | ||
| #endif | ||
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| #ifdef __cplusplus | ||
| } | ||
| #endif | ||
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| #endif /* CPU_CONF_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. | ||
| */ | ||
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| /** | ||
| * @ingroup cpu_atmega8 | ||
| * @{ | ||
| * | ||
| * @file | ||
| * @brief Default timer configuration | ||
| * | ||
| * @author René Herthel <[email protected]> | ||
| * @author Hauke Petersen <[email protected]> | ||
| * @author Hugues Larrive <[email protected]> | ||
| */ | ||
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| #ifndef DEFAULT_TIMER_CONFIG_H | ||
| #define DEFAULT_TIMER_CONFIG_H | ||
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| #ifdef __cplusplus | ||
| extern "C" { | ||
| #endif | ||
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| #ifndef TIMER_NUMOF | ||
| #define TIMER_NUMOF (1U) | ||
| #define TIMER_CHANNEL_NUMOF (2) | ||
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| #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 */ | ||
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| #ifdef __cplusplus | ||
| } | ||
| #endif | ||
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| #endif /* 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. | ||
| */ | ||
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| /** | ||
| * @ingroup cpu_atmega8 | ||
| * @{ | ||
| * | ||
| * @file | ||
| * @brief CPU specific definitions for internal peripheral handling | ||
| * | ||
| * @author René Herthel <[email protected]> | ||
| * @author Hauke Petersen <[email protected]> | ||
| * @author Hugues Larrive <[email protected]> | ||
| */ | ||
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| #ifndef PERIPH_CPU_H | ||
| #define PERIPH_CPU_H | ||
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| #include "periph_cpu_common.h" | ||
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| #ifdef __cplusplus | ||
| extern "C" { | ||
| #endif | ||
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| /** | ||
| * @brief Define a CPU specific GPIO pin generator macro | ||
| */ | ||
| #define GPIO_PIN(x, y) ((x << 4) | y) | ||
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| /** | ||
| * @brief Available ports on the ATmega8 family | ||
| */ | ||
| enum { | ||
| PORT_B = 1, /**< port B */ | ||
| PORT_C = 2, /**< port C */ | ||
| PORT_D = 3 /**< port D */ | ||
| }; | ||
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| /** | ||
| * @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) } | ||
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| /** | ||
| * @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; | ||
| } | ||
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| /** | ||
| * @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)); | ||
| } | ||
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| return false; | ||
| } | ||
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| /** | ||
| * @name Defines for the I2C interface | ||
| * @{ | ||
| */ | ||
| #define I2C_PORT_REG PORTC | ||
| #define I2C_PIN_MASK (1 << PORTC4) | (1 << PORTC5) | ||
| /** @} */ | ||
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| /** | ||
| * @name EEPROM configuration | ||
| * @{ | ||
| */ | ||
| #define EEPROM_SIZE (512U) /* 512B */ | ||
| /** @} */ | ||
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| #ifdef __cplusplus | ||
| } | ||
| #endif | ||
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| #include "periph_conf.h" | ||
| #include "default_timer_config.h" | ||
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| #endif /* PERIPH_CPU_H */ | ||
| /** @} */ |