/**************************************************************************** * drivers/wireless/ieee802154/mrf24j40/mrf24j40_interrupt.c * * Copyright (C) 2015-2016 Sebastien Lorquet. All rights reserved. * Copyright (C) 2017 Verge Inc. All rights reserved. * Author: Sebastien Lorquet * Author: Anthony Merlino * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * 3. Neither the name NuttX nor the names of its contributors may be * used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include "mrf24j40.h" #include "mrf24j40_reg.h" #include "mrf24j40_regops.h" /**************************************************************************** * Private Function Prototypes ****************************************************************************/ static void mrf24j40_irqwork_rx(FAR struct mrf24j40_radio_s *dev); static void mrf24j40_irqwork_txnorm(FAR struct mrf24j40_radio_s *dev); static void mrf24j40_irqwork_txgts(FAR struct mrf24j40_radio_s *dev, uint8_t gts_num); /**************************************************************************** * Name: mrf24j40_irqwork_txnorm * * Description: * Manage completion of packet transmission. * ****************************************************************************/ static void mrf24j40_irqwork_txnorm(FAR struct mrf24j40_radio_s *dev) { uint8_t reg; enum ieee802154_status_e status; bool framepending; /* Disable tx int */ reg = mrf24j40_getreg(dev->spi, MRF24J40_INTCON); reg |= MRF24J40_INTCON_TXNIE; mrf24j40_setreg(dev->spi, MRF24J40_INTCON, reg); /* Get the status from the device and copy the status into the tx desc. * The status for the normal FIFO is represented with bit TXNSTAT where * 0=success, 1= failure. */ reg = mrf24j40_getreg(dev->spi, MRF24J40_TXSTAT); /* TXNSTAT = 0: Transmission was successful * TXNSTAT = 1: Transmission failed, retry count exceeded */ if (reg & MRF24J40_TXSTAT_TXNSTAT) { /* The number of retries of the most recent transmission is contained in the * TXNRETRY (TXSTAT 0x24<7:6>) bits. The CCAFAIL (TXSTAT 0x24<5>) bit = 1 * indicates if the failed transmission was due to the channel busy * (CSMA-CA timed out). */ if (reg & MRF24J40_TXSTAT_CCAFAIL) { status = IEEE802154_STATUS_CHANNEL_ACCESS_FAILURE; } else { status = IEEE802154_STATUS_NO_ACK; } } else { status = IEEE802154_STATUS_SUCCESS; } framepending = (mrf24j40_getreg(dev->spi, MRF24J40_TXNCON) & MRF24J40_TXNCON_FPSTAT); if (dev->txdelayed_busy) { /* Inform the next layer of the transmission success/failure */ dev->txdelayed_desc->conf->status = status; dev->txdelayed_desc->framepending = framepending; dev->radiocb->txdone(dev->radiocb, dev->txdelayed_desc); dev->txdelayed_busy = false; if (dev->reschedule_csma) { mrf24j40_norm_setup(dev, dev->csma_desc->frame, true); mrf24j40_norm_trigger(dev); dev->reschedule_csma = false; } } else { /* Inform the next layer of the transmission success/failure */ dev->csma_desc->conf->status = status; dev->csma_desc->framepending = framepending; dev->radiocb->txdone(dev->radiocb, dev->csma_desc); /* We are now done with the transaction */ dev->csma_busy = 0; /* Must unlock the radio before calling poll */ sem_post(&dev->exclsem); mrf24j40_dopoll_csma(dev); while (sem_wait(&dev->exclsem) != 0) { } } } /**************************************************************************** * Name: mrf24j40_irqwork_gts * * Description: * Manage completion of packet transmission. * ****************************************************************************/ static void mrf24j40_irqwork_txgts(FAR struct mrf24j40_radio_s *dev, uint8_t gts) { uint8_t txstat; /* Disable tx int */ txstat = mrf24j40_getreg(dev->spi, MRF24J40_INTCON); txstat |= MRF24J40_INTCON_TXNIE; mrf24j40_setreg(dev->spi, MRF24J40_INTCON, txstat); /* Get the status from the device and copy the status into the tx desc. * The status for the normal FIFO is represented with bit TXNSTAT where * 0=success, 1= failure. */ txstat = mrf24j40_getreg(dev->spi, MRF24J40_TXSTAT); if (gts == 0) { dev->csma_desc->conf->status = txstat & MRF24J40_TXSTAT_TXG1STAT; } else if (gts == 1) { dev->csma_desc->conf->status = txstat & MRF24J40_TXSTAT_TXG2STAT; } /* Inform the next layer of the transmission success/failure */ dev->radiocb->txdone(dev->radiocb, dev->gts_desc[gts]); /* We are now done with the transaction */ dev->gts_busy[gts]= 0; mrf24j40_dopoll_gts(dev); } /**************************************************************************** * Name: mrf24j40_irqwork_rx * * Description: * Manage packet reception. * ****************************************************************************/ static void mrf24j40_irqwork_rx(FAR struct mrf24j40_radio_s *dev) { FAR struct ieee802154_data_ind_s *ind; uint32_t addr; uint32_t index; uint8_t reg; wlinfo("RX interrupt\n"); /* Disable rx int */ reg = mrf24j40_getreg(dev->spi, MRF24J40_INTCON); reg |= MRF24J40_INTCON_RXIE; mrf24j40_setreg(dev->spi, MRF24J40_INTCON, reg); /* Disable packet reception. See pg. 109 of datasheet */ mrf24j40_setreg(dev->spi, MRF24J40_BBREG1, MRF24J40_BBREG1_RXDECINV); /* Allocate a data_ind to put the frame in */ ind = ieee802154_ind_allocate(); if (ind == NULL) { wlerr("ERROR: Unable to allocate data_ind. Discarding frame\n"); goto done; } /* Read packet */ addr = MRF24J40_RXBUF_BASE; ind->frame->io_len = mrf24j40_getreg(dev->spi, addr++); for (index = 0; index < ind->frame->io_len; index++) { ind->frame->io_data[index] = mrf24j40_getreg(dev->spi, addr++); } ind->lqi = mrf24j40_getreg(dev->spi, addr++); ind->rssi = mrf24j40_getreg(dev->spi, addr++); /* Reduce len by 2, we only receive frames with correct crc, no check * required. */ ind->frame->io_len -= 2; /* Callback the receiver in the next highest layer */ dev->radiocb->rxframe(dev->radiocb, ind); done: /* Enable reception of next packet by flushing the fifo. * This is an MRF24J40 errata (no. 1). */ mrf24j40_setreg(dev->spi, MRF24J40_RXFLUSH, 1); /* Only enable RX interrupt if we are to be listening when IDLE */ if (dev->rxenabled) { /* Enable packet reception */ mrf24j40_setreg(dev->spi, MRF24J40_BBREG1, 0); reg = mrf24j40_getreg(dev->spi, MRF24J40_INTCON); reg &= ~MRF24J40_INTCON_RXIE; mrf24j40_setreg(dev->spi, MRF24J40_INTCON, reg); } } /**************************************************************************** * Name: mrf24j40_irqworker * * Description: * Perform interrupt handling logic outside of the interrupt handler (on * the work queue thread). * * Parameters: * arg - The reference to the driver structure (cast to void*) * * Returned Value: * None * * Assumptions: * ****************************************************************************/ void mrf24j40_irqworker(FAR void *arg) { FAR struct mrf24j40_radio_s *dev = (FAR struct mrf24j40_radio_s *)arg; uint8_t intstat; uint8_t reg; DEBUGASSERT(dev); DEBUGASSERT(dev->spi); /* Get exclusive access to the driver */ while (sem_wait(&dev->exclsem) != 0) { } /* Read and store INTSTAT - this clears the register. */ intstat = mrf24j40_getreg(dev->spi, MRF24J40_INTSTAT); /* Do work according to the pending interrupts */ if ((intstat & MRF24J40_INTSTAT_HSYMTMRIF)) { /* As of now the only use for the MAC timer is for delayed transactions. * Therefore, all we do here is trigger the TX norm FIFO */ mrf24j40_norm_trigger(dev); /* Timers are one-shot, so disable the interrupt */ reg = mrf24j40_getreg(dev->spi, MRF24J40_INTCON); reg |= MRF24J40_INTCON_HSYMTMRIE; mrf24j40_setreg(dev->spi, MRF24J40_INTCON, reg); } if ((intstat & MRF24J40_INTSTAT_RXIF) && dev->rxenabled) { /* A packet was received, retrieve it */ mrf24j40_irqwork_rx(dev); } if ((intstat & MRF24J40_INTSTAT_TXNIF)) { /* A packet was transmitted or failed*/ mrf24j40_irqwork_txnorm(dev); } if ((intstat & MRF24J40_INTSTAT_TXG1IF)) { /* A packet was transmitted or failed*/ mrf24j40_irqwork_txgts(dev, 0); } if ((intstat & MRF24J40_INTSTAT_TXG1IF)) { /* A packet was transmitted or failed*/ mrf24j40_irqwork_txgts(dev, 1); } if ((intstat & MRF24J40_INTSTAT_SLPIF)) { dev->radiocb->sfevent(dev->radiocb, IEEE802154_SFEVENT_ENDOFACTIVE); /* Acknowledge the alert and put the device to sleep */ reg = mrf24j40_getreg(dev->spi, MRF24J40_SLPACK); reg |= MRF24J40_SLPACK_SLPACK; mrf24j40_setreg(dev->spi, MRF24J40_SLPACK, reg); } if ((intstat & MRF24J40_INTSTAT_WAKEIF)) { #ifdef CONFIG_MAC802154_SFEVENT_VERBOSE wlinfo("Wake Interrupt\n"); #endif if (dev->devmode != IEEE802154_DEVMODE_ENDPOINT) { /* This is right before the beacon, we set the bsn here, since the MAC * uses the SLPIF (end of active portion of superframe). to make any * changes to the beacon. This assumes that any changes to the beacon * be in by the time that this interrupt fires. */ mrf24j40_setreg(dev->spi, MRF24J40_BEACON_FIFO + 4, dev->bsn++); mrf24j40_beacon_trigger(dev); wlinfo("Beacon triggered. BSN: 0x%02X\n", dev->bsn-1); } } /* Unlock the radio device */ sem_post(&dev->exclsem); /* Re-enable GPIO interrupts */ dev->lower->enable(dev->lower, true); } /**************************************************************************** * Name: mrf24j40_interrupt * * Description: * Hardware interrupt handler * * Parameters: * irq - Number of the IRQ that generated the interrupt * context - Interrupt register state save info (architecture-specific) * * Returned Value: * OK on success * * Assumptions: * ****************************************************************************/ int mrf24j40_interrupt(int irq, FAR void *context, FAR void *arg) { FAR struct mrf24j40_radio_s *dev = (FAR struct mrf24j40_radio_s *)arg; DEBUGASSERT(dev != NULL); /* In complex environments, we cannot do SPI transfers from the interrupt * handler because semaphores are probably used to lock the SPI bus. In * this case, we will defer processing to the worker thread. This is also * much kinder in the use of system resources and is, therefore, probably * a good thing to do in any event. */ DEBUGASSERT(work_available(&dev->irqwork)); /* Notice that further GPIO interrupts are disabled until the work is * actually performed. This is to prevent overrun of the worker thread. * Interrupts are re-enabled in enc_irqworker() when the work is completed. */ dev->lower->enable(dev->lower, false); return work_queue(HPWORK, &dev->irqwork, mrf24j40_irqworker, (FAR void *)dev, 0); }