static void
ow_temp_event_thread(void *arg)
{
struct ow_temp_softc *sc;
uint8_t scratch[8 + 1];
uint8_t crc;
int retries, rv;
sc = arg;
pause("owtstart", device_get_unit(sc->dev) * hz / 100); // 10ms stagger
mtx_lock(&sc->temp_lock);
sc->flags |= OW_TEMP_RUNNING;
ow_temp_read_power_supply(sc->dev, &sc->parasite);
if (sc->parasite)
device_printf(sc->dev, "Running in parasitic mode unsupported\n");
while ((sc->flags & OW_TEMP_DONE) == 0) {
mtx_unlock(&sc->temp_lock);
ow_temp_convert_t(sc->dev);
mtx_lock(&sc->temp_lock);
msleep(sc, &sc->temp_lock, 0, "owtcvt", hz);
if (sc->flags & OW_TEMP_DONE)
break;
for (retries = 5; retries > 0; retries--) {
mtx_unlock(&sc->temp_lock);
rv = ow_temp_read_scratchpad(sc->dev, scratch, sizeof(scratch));
mtx_lock(&sc->temp_lock);
if (rv == 0) {
crc = own_crc(sc->dev, scratch, sizeof(scratch) - 1);
if (crc == scratch[8]) {
if (sc->type == OWT_DS1820) {
if (scratch[7]) {
/*
* Formula from DS18S20 datasheet, page 6
* DS18S20 datahseet says count_per_c is 16, DS1820 does not
*/
sc->temp = (int16_t)((scratch[0] & 0xfe) |
(scratch[1] << 8)) << 3;
sc->temp += 16 - scratch[6] - 4; /* count_per_c == 16 */
} else
sc->temp = (int16_t)(scratch[0] | (scratch[1] << 8)) << 3;
} else
sc->temp = (int16_t)(scratch[0] | (scratch[1] << 8));
sc->temp = sc->temp * 1000 / 16 + 273150;
break;
}
sc->bad_crc++;
} else
sc->bad_reads++;
}
msleep(sc, &sc->temp_lock, 0, "owtcvt", sc->reading_interval);
}
sc->flags &= ~OW_TEMP_RUNNING;
mtx_unlock(&sc->temp_lock);
kproc_exit(0);
}
int16_t lome6_get_temperature (struct ow_rom_code_t *rom) {
int16_t retval = 0x7FFF; // error
// disable interrupts
uint8_t sreg = SREG;
cli();
struct ow_temp_scratchpad_t sp;
if (ow_temp_read_scratchpad(rom, &sp) != 1)
goto out; // scratchpad read failed
uint16_t temp = ow_temp_normalize(rom, &sp);
retval = ((int8_t) HI8(temp)) * 10 + HI8(((temp & 0x00ff) * 10) + 0x80);
out:
sei();
SREG = sreg;
return retval;
}
/*This function will be called every 800 ms*/
void ow_periodic(void) {
/*At startup we want an immediate discovery*/
static uint16_t discover_delay = 3;
if (--discover_delay == 0) {
discover_delay = OW_DISCOVER_DELAY;
ow_discover_sensor();
#ifdef DEBUG_OW_POLLING
for (uint8_t i = 0, k = 0; i < OW_SENSORS_COUNT; i++) {
if (ow_sensors[i].ow_rom_code.raw != 0) {
debug_printf("sensor #%d in list is: %02x %02x %02x %02x %02x %02x %02x %02x\n",
++k,
ow_sensors[i].ow_rom_code.bytewise[0],
ow_sensors[i].ow_rom_code.bytewise[1],
ow_sensors[i].ow_rom_code.bytewise[2],
ow_sensors[i].ow_rom_code.bytewise[3],
ow_sensors[i].ow_rom_code.bytewise[4],
ow_sensors[i].ow_rom_code.bytewise[5],
ow_sensors[i].ow_rom_code.bytewise[6],
ow_sensors[i].ow_rom_code.bytewise[7]);
}
}
#endif /* DEBUG_OW_POLLING */
}
for (uint8_t i = 0; i < OW_SENSORS_COUNT; i++) {
if (ow_temp_sensor(&ow_sensors[i].ow_rom_code)) {
if (ow_sensors[i].converted == 1) {
if (ow_sensors[i].convert_delay == 1)
ow_sensors[i].convert_delay = 0;
else {
#ifdef DEBUG_OW_POLLING
debug_printf("reading temperature\n");
#endif /* DEBUG_OW_POLLING */
int8_t ret;
ow_temp_scratchpad_t sp;
ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
ret = ow_temp_read_scratchpad(&ow_sensors[i].ow_rom_code, &sp);
}
if (ret != 1) {
#ifdef DEBUG_OW_POLLING
debug_printf("scratchpad read failed: %d\n", ret);
#endif /* DEBUG_OW_POLLING */
return;
}
#ifdef DEBUG_OW_POLLING
debug_printf("scratchpad read succeeded\n");
#endif /* DEBUG_OW_POLLING */
int16_t temp = ow_temp_normalize(&ow_sensors[i].ow_rom_code, &sp);
#ifdef DEBUG_OW_POLLING
debug_printf("temperature: %d.%d\n", HI8(temp), LO8(temp) > 0 ? 5 : 0);
#endif /* DEBUG_OW_POLLING */
ow_sensors[i].temp = ((int8_t) HI8(temp)) * 10 + HI8(((temp & 0x00ff) * 10) + 0x80);
ow_sensors[i].converted = 0;
}
}
if (--ow_sensors[i].read_delay == 0 && ow_sensors[i].converted == 0) {
ow_sensors[i].read_delay = OW_READ_DELAY;
ow_temp_start_convert_nowait(&ow_sensors[i].ow_rom_code);
ow_sensors[i].convert_delay = 1;
ow_sensors[i].converted = 1;
}
}
}
}
