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71 lines
1.9 KiB
71 lines
1.9 KiB
7 years ago
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/*
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* system_timer.c
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*
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* Created on: Dec 6, 2017
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* Author: maximilian
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*/
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#include "stm32f10x.h"
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#include "stm32f10x_flash.h"
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#include "stm32f10x_rcc.h"
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#define ALIVE_PULSE_LENGTH 200
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static volatile uint32_t ticky = 0;
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void InitAliveLED(void)
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{
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/* Activate clock for peripheral. */
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
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/* Initialize GPIO Pin. */
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GPIO_InitTypeDef GPIO_InitStructure ;
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GPIO_StructInit (&GPIO_InitStructure );
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 ;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP ;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz ;
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GPIO_Init (GPIOA , & GPIO_InitStructure );
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}
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void InitClock(void)
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{
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/* Configure all clocks to max for best performance.
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If there are EMI, power, or noise problems, try slowing the clocks.*/
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/* First set the flash latency to work with our clock.
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000 Zero wait state, if 0 MHz < SYSCLK <= 24 MHz
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001 One wait state, if 24 MHz < SYSCLK <= 48 MHz
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010 Two wait states, if 48 MHz < SYSCLK <= 72 MHz */
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FLASH_SetLatency(FLASH_Latency_1);
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/* Start with HSI (High-Speed Internal) clock with 8 MHz, divide by 2 and multiply by 9 to
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get maximum allowed frequency: 36 MHz
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Enable PLL, wait till it's stable, then select it as system clock*/
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RCC_PLLConfig(RCC_PLLSource_HSI_Div2, RCC_PLLMul_9);
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RCC_PLLCmd(ENABLE);
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while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET) {}
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RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
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/* Set HCLK, PCLK1, and PCLK2 to SCLK. */
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RCC_HCLKConfig(RCC_SYSCLK_Div1);
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RCC_PCLK1Config(RCC_HCLK_Div8);
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RCC_PCLK2Config(RCC_HCLK_Div8);
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/* Configure Cortex-M System Tick Timer to tick every ms.*/
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SystemCoreClockUpdate();
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SysTick_Config(SystemCoreClock / 1000);
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}
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void SysTick_Handler(void)
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{
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static volatile uint8_t led_stat = 0;
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if(ticky == ALIVE_PULSE_LENGTH)
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{
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led_stat = !led_stat;
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GPIO_WriteBit(GPIOA, GPIO_Pin_5, led_stat);
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ticky = 0;
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}
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else
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ticky++;
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}
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