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5c6018f0e2
This currently supports the stm32f107, but support will be added for the F105 shortly (missing a linker script and I can't properly test without a devkit).
79 lines
1.5 KiB
C
79 lines
1.5 KiB
C
#include <sys/clock.h>
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#include <sys/cc.h>
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#include <sys/etimer.h>
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#include <debug-uart.h>
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#include <libopencm3/cm3/systick.h>
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static volatile clock_time_t current_clock = 0;
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static volatile unsigned long current_seconds = 0;
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static unsigned int second_countdown = CLOCK_SECOND;
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void sys_tick_handler(void) __attribute__ ((interrupt));
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void
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sys_tick_handler(void)
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{
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current_clock++;
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if(etimer_pending() && etimer_next_expiration_time() <= current_clock) {
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etimer_request_poll();
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/* printf("%d,%d\n", clock_time(),etimer_next_expiration_time ()); */
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}
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if(--second_countdown == 0) {
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current_seconds++;
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second_countdown = CLOCK_SECOND;
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}
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}
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void
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clock_init()
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{
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systick_set_clocksource(STK_CTRL_CLKSOURCE_AHB_DIV8);
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/*72mhz / 8 / 1000 */
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systick_set_reload(MCK / 8 / CLOCK_SECOND);
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systick_interrupt_enable();
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systick_counter_enable();
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}
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clock_time_t
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clock_time(void)
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{
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return current_clock;
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}
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unsigned long
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clock_seconds(void)
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{
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return current_seconds;
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}
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/* TODO: This code needs to be evaluated for the stm32f107 and
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* implemented
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*/
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#if 0
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/* The inner loop takes 4 cycles. The outer 5+SPIN_COUNT*4. */
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#define SPIN_TIME 2 /* us */
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#define SPIN_COUNT (((MCK*SPIN_TIME/1000000)-5)/4)
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#ifndef __MAKING_DEPS__
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void
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clock_delay(unsigned int t)
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{
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#ifdef __THUMBEL__
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asm
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volatile
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("1: mov r1,%2\n2:\tsub r1,#1\n\tbne 2b\n\tsub %0,#1\n\tbne 1b\n":"=l"
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(t):"0"(t), "l"(SPIN_COUNT));
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#else
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#error Must be compiled in thumb mode
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#endif
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}
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#endif
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#endif /* __MAKING_DEPS__ */
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