1 /*
2  * Copyright (c) 2016 RnDity Sp. z o.o.
3  *
4  * SPDX-License-Identifier: Apache-2.0
5  */
6 
7 /**
8  * @file
9  * @brief System/hardware module for STM32F3 processor
10  */
11 
12 #include <device.h>
13 #include <init.h>
14 #include <arch/cpu.h>
15 #include <arch/arm/aarch32/cortex_m/cmsis.h>
16 
17 /**
18  * @brief Perform basic hardware initialization at boot.
19  *
20  * This needs to be run from the very beginning.
21  * So the init priority has to be 0 (zero).
22  *
23  * @return 0
24  */
stm32f3_init(const struct device * arg)25 static int stm32f3_init(const struct device *arg)
26 {
27 	uint32_t key;
28 
29 	ARG_UNUSED(arg);
30 
31 	key = irq_lock();
32 
33 	/* Install default handler that simply resets the CPU
34 	 * if configured in the kernel, NOP otherwise
35 	 */
36 	NMI_INIT();
37 
38 	irq_unlock(key);
39 
40 	/* Update CMSIS SystemCoreClock variable (HCLK) */
41 	/* At reset, system core clock is set to 8 MHz from HSI */
42 	SystemCoreClock = 8000000;
43 
44 	return 0;
45 }
46 
47 SYS_INIT(stm32f3_init, PRE_KERNEL_1, 0);
48