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19 lines
729 B
C
19 lines
729 B
C
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// Copyright (c) 2023 Cesanta Software Limited
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// All rights reserved
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//
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// This file contains essentials required by the CMSIS:
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// uint32_t SystemCoreClock - holds the system core clock value
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// SystemInit() - initialises the system, e.g. sets up clocks
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#include "hal.h"
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uint32_t SystemCoreClock = CPU_FREQUENCY;
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void SystemInit(void) { // Called automatically by startup code
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SCB->CPACR |= ((3UL << 20U) | (3UL << 22U)); // Enable FPU
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RCC->CR = RCC_CR_HSION; // Clear HSI clock divisor. SYS clock 64Mhz
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while ((RCC->CR & RCC_CR_HSIRDY) == 0) spin(1); // Wait until done
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rng_init(); // Initialise random number generator
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SysTick_Config(CPU_FREQUENCY / 1000); // Sys tick every 1ms
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}
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