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/* * Copyright (c) 2018 Endre Karlson <endre.karlson@gmail.com> * * SPDX-License-Identifier: Apache-2.0 */ /** * @file * @brief System/hardware module for STM32L0 processor */ #include <device.h> #include <init.h> #include <arch/cpu.h> #include <arch/arm/cortex_m/cmsis.h> #include <linker/linker-defs.h> #include <string.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 stm32l0_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 2.1 MHz from MSI */ SystemCoreClock = 2097152; return 0; } SYS_INIT(stm32l0_init, PRE_KERNEL_1, 0); |