Missing file

2010-02-05 16:41:23 +00:00 · 2010-02-05 16:41:23 +00:00 · 387483ad24
parent 2c955d6e3f
commit 387483ad24
1 changed files with 71 additions and 0 deletions
--- a/cpu/arm/stm32f103/clock.c
+++ b/cpu/arm/stm32f103/clock.c
@ -0,0 +1,71 @@
+#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;
+}