*/
#include <cpu/irq.h>
+#include <drv/timer.h>
#include "io/lm3s.h"
-#include "drv/timer_lm3s.h"
-extern unsigned long ticks;
+static Process *hp_proc, *lp_proc;
-int main(void)
-{
- timer_hw_init();
+static hptime_t start, end;
+static void led_init(void)
+{
/* Enable the GPIO port that is used for the on-board LED */
SYSCTL_RCGC2_R = SYSCTL_RCGC2_GPIOG;
/*
/* Enable the GPIO pin for the LED */
GPIO_PORTG_DIR_R = 0x04;
GPIO_PORTG_DEN_R = 0x04;
+}
+
+INLINE void led_on(void)
+{
+ GPIO_PORTG_DATA_R |= 0x04;
+}
+
+INLINE void led_off(void)
+{
+ GPIO_PORTG_DATA_R &= ~0x04;
+}
+
+INLINE hptime_t get_hp_ticks(void)
+{
+ return (TIMER_HW_CNT - timer_hw_hpread()) +
+ timer_clock_unlocked() * TIMER_HW_CNT;
+}
+
+#if CONFIG_KERN_HEAP
+#define hp_stack NULL
+#define HP_STACK_SIZE KERN_MINSTACKSIZE * 2
+#else
+static PROC_DEFINE_STACK(hp_stack, KERN_MINSTACKSIZE * 2);
+#define HP_STACK_SIZE sizeof(hp_stack)
+#endif
+
+static void NORETURN hp_process(void)
+{
+ char spinner[] = {'/', '-', '\\', '|'};
+ int i;
+
+ for(i = 0; ; i++)
+ {
+ sig_wait(SIG_USER0);
+ end = get_hp_ticks();
+ kprintf("%c context switch in %lu clock cycles (~%lu us) \r",
+ spinner[i % countof(spinner)],
+ end - start,
+ ((end - start) * 1000000 / CPU_FREQ));
+ led_off();
+ timer_delay(50);
+ sig_send(lp_proc, SIG_USER0);
+ }
+}
- while(1)
+static void NORETURN lp_process(void)
+{
+ while (1)
{
- /* Turn on the LED */
- if ((ticks & 0x04) == 0x04)
- GPIO_PORTG_DATA_R |= 0x04;
- /* Turn off the LED */
- else if ((ticks & 0x04) == 0)
- GPIO_PORTG_DATA_R &= ~0x04;
+ led_on();
+ timer_delay(50);
+ start = get_hp_ticks();
+ sig_send(hp_proc, SIG_USER0);
+ sig_wait(SIG_USER0);
}
}
+
+int main(void)
+{
+ IRQ_ENABLE;
+ kdbg_init();
+
+ kputs("Init LED..");
+ led_init();
+ kputs("Done.\n");
+ kputs("Init Timer..");
+ timer_init();
+ kputs("Done.\n");
+ kputs("Init Process..");
+ proc_init();
+ kputs("Done.\n");
+
+ kputs("Check scheduling functionality\n");
+ proc_testRun();
+
+ kputs("BeRTOS is up & running\n\n");
+ hp_proc = proc_new(hp_process, NULL, HP_STACK_SIZE, hp_stack);
+ lp_proc = proc_current();
+
+ proc_setPri(hp_proc, 2);
+ proc_setPri(lp_proc, 1);
+
+ lp_process();
+}