72 lines
1.3 KiB
C
72 lines
1.3 KiB
C
#include "timebase.h"
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#define CTRL_ENABLE (1U<<0)
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#define CTRL_TICKINT (1U<<1)
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#define CTRL_CLKSRC (1U<<2)
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#define CTRL_COUNTFLAG (1U<<16)
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#define MAX_DELAY 0xFFFFFFFFU
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volatile uint32_t g_curr_tick;
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volatile uint32_t g_curr_tick_p;
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volatile uint32_t tick_freq = 1;
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uint8_t tick_freq_div = 1;
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void tick_increment(void)
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{
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g_curr_tick += tick_freq;
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}
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void delay_s(uint32_t delay)
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{
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delay_ms(delay * 1000);
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}
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void delay_ms(uint32_t delay)
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{
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uint32_t tickstart = get_tick();
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uint32_t wait = delay;
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if(wait < MAX_DELAY)
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{
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wait += (uint32_t)(tick_freq);
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}
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while((get_tick() - tickstart) < wait){}
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}
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uint32_t get_tick(void)
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{
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__disable_irq();
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g_curr_tick_p = g_curr_tick;
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__enable_irq();
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return g_curr_tick_p;
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}
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void timebase_init(void)
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{
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/* Reload the timer with number of cycles per second */
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/* Getting SystemCoreClock divide by 1000 to get interrupt every 1ms */
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SysTick->LOAD = (SystemCoreClock / 1000) - 1;
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/* Clear Systick current value register */
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SysTick->VAL = 0x00;
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/* Select Internal Clock source */
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SysTick->CTRL = CTRL_CLKSRC;
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/* Enable interrupt */
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SysTick->CTRL |= CTRL_TICKINT;
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/* Enable Systick */
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SysTick->CTRL |= CTRL_ENABLE;
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/* Enable Global Interrupt */
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__enable_irq();
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}
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void SysTick_Handler(void){
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tick_increment();
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} |