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#include "project.h"
#define DEBOUNCE 10
#define DIAL_BLACKOUT 90 /* (10pps) */
#define L2_THRESHOLD 1500
static int hs_poll=DEBOUNCE;
int hook=1;
static int dial_poll;
static int dial_pulse_blackout;
static int pulse_count;
static int dial_mute_time;
static int fake_hook;
static void
exti5_isr (void)
{
exti_reset_request (EXTI5);
dial_poll = DEBOUNCE;
}
static void
exti7_isr (void)
{
exti_reset_request (EXTI7);
if (dial_pulse_blackout)
return;
dial_pulse_blackout = DIAL_BLACKOUT;
if ((!pulse_count) && (dial_mute_time>L2_THRESHOLD))
pulse_count=100;
pulse_count++;
}
static void
exti14_isr (void)
{
exti_reset_request (EXTI14);
hs_poll = DEBOUNCE;
}
void
exti9_5_isr (void)
{
if (exti_get_flag_status (EXTI5))
exti5_isr ();
if (exti_get_flag_status (EXTI7))
exti7_isr ();
}
void
exti15_10_isr (void)
{
if (exti_get_flag_status (EXTI14))
exti14_isr ();
}
static void
hs_tick (void)
{
int h;
if (!hs_poll)
return;
hs_poll--;
if (hs_poll)
return;
h = !gpio_get (GPIOC, GPIO14);
h ^= fake_hook;
if (hook == h)
return;
hook = h;
printf ("Hook is now %d\r\n", hook);
if (!hook)
{
if (ringing)
{
ringer_off ();
answer_call ();
}
else
{
ringer_off ();
dialstr_clear ();
dialtone_on ();
}
}
if (hook)
{
ringer_off ();
terminate_call ();
dialstr_clear ();
dialtone_off();
modem_tone_off();
}
}
static void
dial_tick (void)
{
int m;
dial_mute_time++;
if (dial_pulse_blackout)
dial_pulse_blackout--;
if (!dial_poll)
return;
dial_poll--;
if (dial_poll)
return;
m = ! !gpio_get (GPIOA, GPIO5);
if (m) {
dial_mute_time=0;
return;
}
switch (pulse_count) {
case 1:
case 2:
case 3:
case 4:
case 5:
case 6:
case 7:
case 8:
case 9:
dialstr_digit ('0'+pulse_count);
break;
case 10:
dialstr_digit ('0');
break;
case 101:
dialstr_digit ('*');
break;
case 102:
dialstr_digit ('#');
break;
case 103:
dialstr_digit ('R');
break;
case 104:
dialstr_digit ('M');
break;
case 105:
dialstr_digit ('U');
break;
}
pulse_count=0;
}
void
toggle_fake_hook (void)
{
fake_hook ^= 1;
hs_poll = 1;
hs_tick();
}
void
gpio_tick (void)
{
hs_tick ();
dial_tick ();
}
void
gpio_init (void)
{
/*GSM module reset pin */
gpio_set_mode (GPIOA, GPIO_MODE_OUTPUT_2_MHZ,
GPIO_CNF_OUTPUT_PUSHPULL, GPIO1);
gpio_set (GPIOA, GPIO1);
/* Dial mute */
gpio_set_mode (GPIOA, GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_PUSHPULL,
GPIO4);
gpio_set (GPIOA, GPIO4);
gpio_set_mode (GPIOA, GPIO_MODE_INPUT, GPIO_CNF_INPUT_PULL_UPDOWN, GPIO5);
gpio_clear (GPIOA, GPIO5);
exti_select_source (EXTI5, GPIOA);
exti_set_trigger (EXTI5, EXTI_TRIGGER_BOTH);
exti_enable_request (EXTI5);
/*Dial contacts */
gpio_set_mode (GPIOA, GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_PUSHPULL,
GPIO6);
gpio_set (GPIOA, GPIO6);
gpio_set_mode (GPIOA, GPIO_MODE_INPUT, GPIO_CNF_INPUT_PULL_UPDOWN, GPIO7);
gpio_clear (GPIOA, GPIO7);
exti_select_source (EXTI7, GPIOA);
exti_set_trigger (EXTI7, EXTI_TRIGGER_RISING);
exti_enable_request (EXTI7);
nvic_enable_irq (NVIC_EXTI9_5_IRQ);
/*hookswitch */
gpio_set_mode (GPIOC, GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_PUSHPULL,
GPIO15);
gpio_set (GPIOC, GPIO15);
gpio_set_mode (GPIOC, GPIO_MODE_INPUT, GPIO_CNF_INPUT_PULL_UPDOWN, GPIO14);
gpio_clear (GPIOC, GPIO14);
exti_select_source (EXTI14, GPIOC);
exti_set_trigger (EXTI14, EXTI_TRIGGER_BOTH);
exti_enable_request (EXTI14);
nvic_enable_irq (NVIC_EXTI15_10_IRQ);
}
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