#include "project.h"

static int period;
static int place;
int ringing;


#define C6 1047
#define E6 1319

void buzzer_on(void)
{
	gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_2_MHZ,
		      GPIO_CNF_OUTPUT_ALTFN_PUSHPULL,
		      GPIO_TIM1_CH1);
	gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_2_MHZ,
		      GPIO_CNF_OUTPUT_ALTFN_PUSHPULL,
		      GPIO_TIM1_CH1N);

  timer_reset(TIM1);

  timer_set_mode(TIM1, TIM_CR1_CKD_CK_INT, TIM_CR1_CMS_CENTER_1, TIM_CR1_DIR_UP);
  timer_set_oc_mode(TIM1, TIM_OC1, TIM_OCM_PWM2);
  timer_enable_oc_output(TIM1, TIM_OC1);
  timer_enable_oc_output(TIM1, TIM_OC1N);
  timer_enable_break_main_output(TIM1);

  timer_set_oc_value(TIM1, TIM_OC1, period/2);
  timer_set_period(TIM1, period);

  timer_enable_counter(TIM1);
}
void buzzer_off(void)
{
  gpio_set_mode (GPIOA, GPIO_MODE_INPUT, GPIO_CNF_INPUT_PULL_UPDOWN, GPIO8);
  gpio_clear(GPIOA,GPIO8);
  gpio_set_mode (GPIOB, GPIO_MODE_INPUT, GPIO_CNF_INPUT_PULL_UPDOWN, GPIO13);
  gpio_clear(GPIOB,GPIO13);
  timer_disable_counter(TIM1);
}

void buzzer_set_freq(int hz)
{
  period=(48000000/4)/hz;
  timer_set_oc_value(TIM1, TIM_OC1, period/2);
  timer_set_period(TIM1, period);
}

void buzzer_init(void)
{

  /*buzzer*/
  buzzer_off();
  buzzer_set_freq(440);

}


void ring_tick(void)
{
static int t;

if (!ringing) return;
ringing--;

if (!ringing) {
	place=0;
	buzzer_off();
	return;
}



t++;
if (t<50) return;
t=0;


switch(place){
case 1:	
case 3:
case 5:
case 7:

case 13:
case 15:
case 17:
case 19:
	place++;
	buzzer_set_freq(C6);
	break;

case 0:
case 12:
	place++;
	buzzer_set_freq(E6);
	buzzer_on();
	break;
case 2:
case 4:
case 6:
case 14:
case 16:
case 18:
	place++;
	buzzer_set_freq(E6);
	break;

case 8:
case 20:
	place++;
	buzzer_off();
	break;

default:
	place++;
	break;
case 59:
	place=0;
}




}


void ring_off(void)
{
place=0;
ringing=0;
buzzer_off();
}

void ring(int l)
{
//mb();
ringing=l;
}