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/* * Copyright (c) 2016 Open-RnD Sp. z o.o. * Copyright (c) 2016 Linaro Limited. * * SPDX-License-Identifier: Apache-2.0 */ /** * @file * @brief System/hardware module for STM32F4 processor */ #include <device.h> #include <init.h> #include <arch/cpu.h> #include <arch/arm/cortex_m/cmsis.h> /** * @brief Perform basic hardware initialization at boot. * * This needs to be run from the very beginning. * So the init priority has to be 0 (zero). * * @return 0 */ static int st_stm32f4_init(struct device *arg) { u32_t key; ARG_UNUSED(arg); key = irq_lock(); /* Install default handler that simply resets the CPU * if configured in the kernel, NOP otherwise */ NMI_INIT(); irq_unlock(key); /* Update CMSIS SystemCoreClock variable (HCLK) */ /* At reset, system core clock is set to 16 MHz from HSI */ SystemCoreClock = 16000000; return 0; } SYS_INIT(st_stm32f4_init, PRE_KERNEL_1, 0); |