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#include "project.h"
#define J2(a,b) a ## b
#define J3(a,b,c) a ## b ## c
#define P1 (GPIO3)
#define P1_PORT GPIOE
#define T_BIT 1
#define T_PORT GPIOE
#define T_EXTI_LINE T_BIT
#define M_T(a) J2(GPIO,a)
#define T M_T(T_BIT)
#define M_EXTI_T(a) J2(EXTI,a)
#define EXTI_T M_EXTI_T(T_EXTI_LINE)
#define M_exti_t_isr(a) J3(exti,a,_isr)
#define exti_t_isr M_exti_t_isr(T_EXTI_LINE)
#define M_NVIC_EXTI_T_IRQ(a) J3(NVIC_EXTI,a,_IRQ)
#define NVIC_EXTI_T_IRQ M_NVIC_EXTI_T_IRQ(T_EXTI_LINE)
static Event_ring msf_ring;
static uint64_t msf_last_second;
uint64_t msf_last_happy;
static char msf_info[40];
static EPOCH msf_time;
void exti_t_isr (void)
{
uint32_t now = HW_CLOCK_REG;
int v;
v = !!gpio_get (T_PORT, T);
nvic_disable_irq (NVIC_EXTI_T_IRQ);
exti_reset_request (EXTI_T);
msf_ring.events[msf_ring.tx_ptr].when = now;
msf_ring.events[msf_ring.tx_ptr].value = v;
msf_ring.tx_ptr = (msf_ring.tx_ptr + 1) & ERING_MASK;
nvic_enable_irq (NVIC_EXTI_T_IRQ);
}
static uint8_t bitsa[60], bitsb[60];
static int check_min_ident (uint8_t *i)
{
if (i[0]) return 1;
if (!i[1]) return 1;
if (!i[2]) return 1;
if (!i[3]) return 1;
if (!i[4]) return 1;
if (!i[5]) return 1;
if (!i[6]) return 1;
if (i[7]) return 1;
return 0;
}
static void process_bits (uint64_t abs)
{
UTC u;
EPOCH e;
if (check_min_ident (&bitsa[52])) return;
if (check_parity (bitsa, 17, 24, bitsb[54])) return;
if (check_parity (bitsa, 25, 35, bitsb[55])) return;
if (check_parity (bitsa, 36, 38, bitsb[56])) return;
if (check_parity (bitsa, 39, 51, bitsb[57])) return;
u.jday = 0;
u.year = bcd (bitsa, 17, 24);
u.month = bcd (bitsa, 25, 29);
u.mday = bcd (bitsa, 30, 35);
u.hour = bcd (bitsa, 39, 44);
u.minute = bcd (bitsa, 45, 51);
u.second = 0;
u.nanosecond = 0;
/* This is always valid a check_min_ident will fail for leap seconds*/
e = time_utc_to_epoch (u);
if (bitsb[58]) e.s -= 3600; /*BST*/
msf_last_happy = make_happy (abs, 0);
pll_set_offset (e, abs);
dump_bits ("msfa", bitsa);
dump_bits ("msfb", bitsb);
printf ("MSF: Next minute is: %02d-%02d-%02d %02d:%02d\r\n", u.year, u.month, u.mday, u.hour, u.minute);
msf_time = e;
msf_time.s -= 1;
//time_print_epoch (e);
}
static void report_bits (uint64_t abs, int second, int a, int b)
{
if ((!second) || (second > 59)) return;
bitsa[second] = a;
bitsb[second] = b;
if (second == 59) process_bits (abs);
}
void msf_dispatch (void)
{
static uint32_t last_0, last_1, last_s;
static int second, bita, bitb, had_m;
uint32_t pulse_w, offset;
uint64_t abs;
int is_s = 0;
uint32_t now;
int v;
if (msf_ring.rx_ptr == msf_ring.tx_ptr) return;
v = msf_ring.events[msf_ring.rx_ptr].value;
now = msf_ring.events[msf_ring.rx_ptr].when;
led1_set (v);
msf_ring.rx_ptr = (msf_ring.rx_ptr + 1) & ERING_MASK;
#if 0
{
abs = abs_extend (now);
EPOCH e = pll_decompose (abs);
UTC u = time_epoch_to_utc (e);
printf (" MSF %d %02d:%02d.%06d\r\n", v, u.minute, u.second, (int) (u.nanosecond / 1000));
}
#endif
if (v) {
pulse_w = now - last_0;
pulse_w /= (HZ / 1000);
if (pulse_w > 300) {
last_s = now;
is_s = 1;
msf_time.s++;
}
last_1 = now;
} else {
pulse_w = now - last_1;
pulse_w /= (HZ / 1000);
if (pulse_w > 400) {
had_m = 1;
second = 0;
}
last_0 = now;
}
offset = now - last_s;
offset /= (HZ / 1000);
if (is_s) {
abs = abs_extend (now);
msf_last_second = abs;
pll_dispatch (msf_last_happy, abs, "MSF");
sprintf (msf_info, "m=%d s=%02d b=%d%d", had_m, second, bita, bitb);
if (had_m) {
report_bits (abs, second, bita, bitb);
second++;
}
report_time ("MSF", msf_time, abs, msf_info);
// stats();
}
if (!v) { /* 1->0 transition */
if (offset < 150) {
bita = 0;
bitb = 0;
}
if (offset < 250)
bitb = 0;
} else { /* 0->1 transition*/
if (is_s) {
bita = 1;
bitb = 1;
} else if (offset < 250)
bitb = 1;
}
}
void
msf_init (void)
{
MAP_INPUT (T);
MAP_OUTPUT_PP (P1);
gpio_set (P1_PORT, P1);
delay_ms (50);
gpio_clear (P1_PORT, P1);
exti_select_source (EXTI_T, T_PORT);
exti_set_trigger (EXTI_T, EXTI_TRIGGER_BOTH);
exti_enable_request (EXTI_T);
nvic_enable_irq (NVIC_EXTI_T_IRQ);
}
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