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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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