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#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;
}
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