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path: root/cesar/mac/pbproc/src/fsm_handle_fc.c
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/* Cesar project {{{
 *
 * Copyright (C) 2007 Spidcom
 *
 * <<<Licence>>>
 *
 * }}} */
/**
 * \file    mac/pbproc/src/fsm_handle_fc.c
 * \brief   FSM handle FC part.
 * \ingroup mac_pbproc
 */
#include "common/std.h"

#include "pbproc.h"
#include "inc/context.h"
#include "inc/fsm_handle_fc.h"

#include "inc/fsm_rx_data.h"
#include "inc/fsm_rx_beacon.h"
#include "inc/fsm_rx_sound.h"

/**
 * Handle BEACON FC.
 * \param  ctx  pbproc context
 * \param  rx_date  start of preamble date
 * \param  beacon  BEACON FC
 */
static void
pbproc_fhfc_beacon (pbproc_t *ctx, u32 rx_date,
                    const pbproc_fc_beacon_t *beacon);

/**
 * Handle SOF FC.
 * \param  ctx  pbproc context
 * \param  rx_date  start of preamble date
 * \param  sof  SOF FC
 */
static void
pbproc_fhfc_sof (pbproc_t *ctx, u32 rx_date, const pbproc_fc_sof_t *sof);

/**
 * Handle SOUND FC.
 * \param  ctx  pbproc context
 * \param  rx_date  start of preamble date
 * \param  sound  SOUND FC
 */
static void
pbproc_fhfc_sound (pbproc_t *ctx, u32 rx_date,
                   const pbproc_fc_sound_t *sound);

/**
 * Ignore the received PPDU.
 * \param  ctx  pbproc context
 * \param  rx_date  start of preamble date
 * \param  length_tck  length to ignore
 */
static void
pbproc_fhfc_ignore (pbproc_t *ctx, u32 rx_date, uint length_tck);

void
pbproc_fhfc_init (pbproc_t *ctx)
{
    dbg_assert (ctx);
}

void ARCH_ILRAM
pbproc_fhfc_handle_fc (pbproc_t *ctx, u32 rx_date, const pbproc_fc_t *fc_av)
{
    dbg_claim (ctx);
    const bool hybrid = ctx->alloc.hybrid;
    /* Cancel any pending TX. */
    phy_tx_cancel (ctx->phy);
    /* Hold any access update. */
    ca_access_hold (ctx->ca);
    /* Look at FC. */
    if (!fc_av)
    {
        /* Bad CRC. */
        phy_rx_prepare_short (ctx->phy);
        ca_access_vcs_restart (ctx->ca, rx_date,
                               ctx->times[hybrid].eifs_tck,
                               PBPROC_ANTICIP_TCK, true);
        phy_rx_activate (ctx->phy, true, 0, true);
        pbproc_fsm_change_state (ctx, PBPROC_FSM_STATE_IDLE);
    }
    else
    {
        /* Determine PPDU type. */
        switch (fc_av->generic.dt_av)
        {
        case PBPROC_FC_DT_BEACON:
            pbproc_fhfc_beacon (ctx, rx_date, &fc_av->beacon);
            break;
        case PBPROC_FC_DT_SOF:
            pbproc_fhfc_sof (ctx, rx_date, &fc_av->sof);
            break;
        case PBPROC_FC_DT_SACK:
            pbproc_fhfc_ignore (ctx, rx_date, ctx->times[hybrid].pre_fcs_tck +
                                MAC_CIFS_TCK);
            break;
        case PBPROC_FC_DT_SOUND:
            pbproc_fhfc_sound (ctx, rx_date, &fc_av->sound);
            break;
        default:
            /* Count as bad CRC. */
            phy_rx_prepare_short (ctx->phy);
            ca_access_vcs_restart (ctx->ca, rx_date,
                                   ctx->times[hybrid].eifs_tck,
                                   PBPROC_ANTICIP_TCK, true);
            phy_rx_activate (ctx->phy, true, 0, true);
            pbproc_fsm_change_state (ctx, PBPROC_FSM_STATE_IDLE);
        }
    }
}

static void ARCH_ILRAM
pbproc_fhfc_beacon (pbproc_t *ctx, u32 rx_date,
                    const pbproc_fc_beacon_t *beacon)
{
    pbproc_frbe__handle (ctx, rx_date, beacon);
}

static void ARCH_ILRAM
pbproc_fhfc_sof (pbproc_t *ctx, u32 rx_date, const pbproc_fc_sof_t *sof)
{
    const bool hybrid = ctx->alloc.hybrid;
    if (sof->access == false
        && (sof->snid == ctx->alloc.snid || sof->mnbf)
        && (sof->dtei == ctx->config->tei || sof->mcf))
    {
        pbproc_frda__handle (ctx, rx_date, sof);
    }
    else
    {
        /* Not for us, count the expected following SACK. */
        pbproc_fhfc_ignore (ctx, rx_date, MAC_FL_TO_TCK (sof->fl_av)
                            + 2 * ctx->times[hybrid].pre_fcs_tck
                            + MAC_CIFS_TCK);
    }
}

static void ARCH_ILRAM
pbproc_fhfc_sound (pbproc_t *ctx, u32 rx_date, const pbproc_fc_sound_t *sound)
{
    const bool hybrid = ctx->alloc.hybrid;
    if (sound->access == false
        && sound->snid == ctx->alloc.snid
        && sound->dtei == ctx->config->tei
        && !sound->saf)
    {
        pbproc_frso__handle (ctx, rx_date, sound);
    }
    else if (sound->saf)
    {
        /* Acknowledge, ignore. */
        pbproc_fhfc_ignore (ctx, rx_date, ctx->times[hybrid].pre_fcs_tck
                            + MAC_CIFS_TCK);
    }
    else
    {
        /* Not for us, count the expected following SOUND ACK. */
        pbproc_fhfc_ignore (ctx, rx_date, MAC_FL_TO_TCK (sound->fl_av)
                            + 2 * ctx->times[hybrid].pre_fcs_tck
                            + MAC_CIFS_TCK);
    }
}

static void ARCH_ILRAM
pbproc_fhfc_ignore (pbproc_t *ctx, u32 rx_date, uint length_tck)
{
    dbg_claim (ctx);
    dbg_claim (length_tck <= MAC_FL_TO_TCK (MAC_MAX_FL_MAX_FL));
    phy_rx_prepare_short (ctx->phy);
    ca_access_vcs_restart (ctx->ca, rx_date, length_tck, PBPROC_ANTICIP_TCK,
                           false);
    pbproc_fsm_change_state (ctx, PBPROC_FSM_STATE_IDLE);
}