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ksb 2010-02-05 16:41:23 +00:00
parent 2c955d6e3f
commit 387483ad24
1 changed files with 71 additions and 0 deletions
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71
cpu/arm/stm32f103/clock.c Normal file
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#include <stm32f10x_map.h>
#include <nvic.h>
#include <sys/clock.h>
#include <sys/cc.h>
#include <sys/etimer.h>
#include <debug-uart.h>
static volatile clock_time_t current_clock = 0;
static volatile unsigned long current_seconds = 0;
static unsigned int second_countdown = CLOCK_SECOND;
void
SysTick_handler(void) __attribute__ ((interrupt));
void
SysTick_handler(void)
{
(void)SysTick->CTRL;
SCB->ICSR = SCB_ICSR_PENDSTCLR;
current_clock++;
if(etimer_pending() && etimer_next_expiration_time() <= current_clock) {
etimer_request_poll();
/* printf("%d,%d\n", clock_time(),etimer_next_expiration_time ()); */
}
if (--second_countdown == 0) {
current_seconds++;
second_countdown = CLOCK_SECOND;
}
}
void
clock_init()
{
NVIC_SET_SYSTICK_PRI(8);
SysTick->LOAD = MCK/8/CLOCK_SECOND;
SysTick->CTRL = SysTick_CTRL_ENABLE | SysTick_CTRL_TICKINT;
}
clock_time_t
clock_time(void)
{
return current_clock;
}
#if 0
/* The inner loop takes 4 cycles. The outer 5+SPIN_COUNT*4. */
#define SPIN_TIME 2 /* us */
#define SPIN_COUNT (((MCK*SPIN_TIME/1000000)-5)/4)
#ifndef __MAKING_DEPS__
void
clock_delay(unsigned int t)
{
#ifdef __THUMBEL__
asm volatile("1: mov r1,%2\n2:\tsub r1,#1\n\tbne 2b\n\tsub %0,#1\n\tbne 1b\n":"=l"(t):"0"(t),"l"(SPIN_COUNT));
#else
#error Must be compiled in thumb mode
#endif
}
#endif
#endif /* __MAKING_DEPS__ */
unsigned long
clock_seconds(void)
{
return current_seconds;
}