Example #1
0
/**
 * @brief     1-wire read bit callback.
 * @note      Must be called from PWM's ISR.
 *
 * @param[in] pwmp      pointer to the @p PWMDriver object
 * @param[in] owp       pointer to the @p onewireDriver object
 *
 * @notapi
 */
static void ow_read_bit_cb(PWMDriver *pwmp, onewireDriver *owp) {

  if (true == owp->reg.final_timeslot) {
    osalSysLockFromISR();
    pwmDisableChannelI(pwmp, owp->config->sample_channel);
    osalThreadResumeI(&owp->thread, MSG_OK);
    osalSysUnlockFromISR();
    return;
  }
  else {
    *owp->buf |= ow_read_bit(owp) << owp->reg.bit;
    owp->reg.bit++;
    if (8 == owp->reg.bit) {
      owp->reg.bit = 0;
      owp->buf++;
      owp->reg.bytes--;
      if (0 == owp->reg.bytes) {
        owp->reg.final_timeslot = true;
        osalSysLockFromISR();
        /* Only master channel must be stopped here.
           Sample channel will be stopped in next ISR call.
           It is still needed to generate final interrupt. */
        pwmDisableChannelI(pwmp, owp->config->master_channel);
        osalSysUnlockFromISR();
      }
    }
  }
}
static void pwm3cb(PWMDriver *pwmp) {

  chSysLockFromIsr();
  if (pwm_cycles > 8) {
	  pwmDisableChannelI(pwmp, 2);
	  pwmDisableChannelI(pwmp, 3);
	  tmp1 = (&GPT_DRIVER)->tim->CNT;
  }
  chSysUnlockFromIsr();
}
Example #3
0
/**
 * @brief     1-wire reset pulse callback.
 * @note      Must be called from PWM's ISR.
 *
 * @param[in] pwmp      pointer to the @p PWMDriver object
 * @param[in] owp       pointer to the @p onewireDriver object
 *
 * @notapi
 */
static void ow_reset_cb(PWMDriver *pwmp, onewireDriver *owp) {

  owp->reg.slave_present = (PAL_LOW == ow_read_bit(owp));

  osalSysLockFromISR();
  pwmDisableChannelI(pwmp, owp->config->sample_channel);
  osalThreadResumeI(&owp->thread, MSG_OK);
  osalSysUnlockFromISR();
}
Example #4
0
/**
 * @brief   Disables a PWM channel and its notification.
 * @pre     The PWM unit must have been activated using @p pwmStart().
 * @post    The channel is disabled and its output line returned to the
 *          idle state.
 * @note    Depending on the hardware implementation this function has
 *          effect starting on the next cycle (recommended implementation)
 *          or immediately (fallback implementation).
 *
 * @param[in] pwmp      pointer to a @p PWMDriver object
 * @param[in] channel   PWM channel identifier (0...channels-1)
 *
 * @api
 */
void pwmDisableChannel(PWMDriver *pwmp, pwmchannel_t channel) {

  osalDbgCheck((pwmp != NULL) && (channel < pwmp->channels));

  osalSysLock();

  osalDbgAssert(pwmp->state == PWM_READY, "not ready");

  pwmDisableChannelI(pwmp, channel);

  osalSysUnlock();
}
/*
 * PWM callbacks.
 */
static void pwm1cb(PWMDriver *pwmp) {
  (void)pwmp;

  chSysLockFromIsr();
  pwm_cycles++;
  if (pwm_cycles > 160) {
	  pwmDisableChannelI(pwmp, 0);
	  pwm_cycles = 0;
	  extChannelEnableI(&EXT_DRIVER, ECHO);
	  tmp2 = (&GPT_DRIVER)->tim->CNT;
  }
  chSysUnlockFromIsr();
}
Example #6
0
/**
 * @brief     1-wire bit transmission callback.
 * @note      Must be called from PWM's ISR.
 *
 * @param[in] pwmp      pointer to the @p PWMDriver object
 * @param[in] owp       pointer to the @p onewireDriver object
 *
 * @notapi
 */
static void ow_write_bit_cb(PWMDriver *pwmp, onewireDriver *owp) {

  if (8 == owp->reg.bit) {
    owp->buf++;
    owp->reg.bit = 0;
    owp->reg.bytes--;

    if (0 == owp->reg.bytes) {
      osalSysLockFromISR();
      pwmDisableChannelI(pwmp, owp->config->master_channel);
      osalSysUnlockFromISR();
      /* used to prevent premature timer stop from userspace */
      owp->reg.final_timeslot = true;
      return;
    }
  }

  /* wait until timer generate last pulse */
  if (true == owp->reg.final_timeslot) {
    #if ONEWIRE_USE_STRONG_PULLUP
    if (owp->reg.need_pullup) {
      owp->reg.state = ONEWIRE_PULL_UP;
      owp->config->pullup_assert();
      owp->reg.need_pullup = false;
    }
    #endif

    osalSysLockFromISR();
    osalThreadResumeI(&owp->thread, MSG_OK);
    osalSysUnlockFromISR();
    return;
  }

  ow_write_bit_I(owp, (*owp->buf >> owp->reg.bit) & 1);
  owp->reg.bit++;
}
Example #7
0
/**
 * @brief     1-wire search ROM callback.
 * @note      Must be called from PWM's ISR.
 *
 * @param[in] pwmp      pointer to the @p PWMDriver object
 * @param[in] owp       pointer to the @p onewireDriver object
 *
 * @notapi
 */
static void ow_search_rom_cb(PWMDriver *pwmp, onewireDriver *owp) {

  onewire_search_rom_t *sr = &owp->search_rom;

  if (0 == sr->reg.bit_step) {                    /* read direct bit */
    sr->reg.bit_buf |= ow_read_bit(owp);
    sr->reg.bit_step++;
  }
  else if (1 == sr->reg.bit_step) {               /* read complement bit */
    sr->reg.bit_buf |= ow_read_bit(owp) << 1;
    sr->reg.bit_step++;
    switch(sr->reg.bit_buf){
    case 0b11:
      /* no one device on bus or any other fail happened */
      sr->reg.result = ONEWIRE_SEARCH_ROM_ERROR;
      goto THE_END;
      break;
    case 0b01:
      /* all slaves have 1 in this position */
      store_bit(sr, 1);
      ow_write_bit_I(owp, 1);
      break;
    case 0b10:
      /* all slaves have 0 in this position */
      store_bit(sr, 0);
      ow_write_bit_I(owp, 0);
      break;
    case 0b00:
      /* collision */
      sr->reg.single_device = false;
      ow_write_bit_I(owp, collision_handler(sr));
      break;
    }
  }
  else {                                      /* start next step */
    #if !ONEWIRE_SYNTH_SEARCH_TEST
    ow_write_bit_I(owp, 1);
    #endif
    sr->reg.bit_step = 0;
    sr->reg.bit_buf = 0;
  }

  /* one ROM successfully discovered */
  if (64 == sr->reg.rombit) {
    sr->reg.devices_found++;
    sr->reg.search_iter = ONEWIRE_SEARCH_ROM_NEXT;
    if (true == sr->reg.single_device)
      sr->reg.result = ONEWIRE_SEARCH_ROM_LAST;
    goto THE_END;
  }
  return; /* next search bit iteration */

THE_END:
#if ONEWIRE_SYNTH_SEARCH_TEST
  (void)pwmp;
  return;
#else
  osalSysLockFromISR();
  pwmDisableChannelI(pwmp, owp->config->master_channel);
  pwmDisableChannelI(pwmp, owp->config->sample_channel);
  osalThreadResumeI(&(owp)->thread, MSG_OK);
  osalSysUnlockFromISR();
#endif
}