50 lines
920 B
C
50 lines
920 B
C
/*
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* Copyright (c) 2019 Linaro Ltd.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @file
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* @brief System/hardware module for STM32L1 processor
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*/
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#include <device.h>
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#include <init.h>
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#include <arch/cpu.h>
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#include <arch/arm/cortex_m/cmsis.h>
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#include <linker/linker-defs.h>
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#include <string.h>
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/**
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* @brief Perform basic hardware initialization at boot.
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*
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* This needs to be run from the very beginning.
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* So the init priority has to be 0 (zero).
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*
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* @return 0
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*/
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static int stm32l1_init(struct device *arg)
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{
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u32_t key;
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ARG_UNUSED(arg);
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key = irq_lock();
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/* Install default handler that simply resets the CPU
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* if configured in the kernel, NOP otherwise
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*/
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NMI_INIT();
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irq_unlock(key);
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/* Update CMSIS SystemCoreClock variable (HCLK) */
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/* At reset, system core clock is set to 2.1 MHz from MSI */
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SystemCoreClock = 2097000;
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return 0;
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}
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SYS_INIT(stm32l1_init, PRE_KERNEL_1, 0);
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