/* * Copyright (C) 2013 Alaeddine Weslati * Copyright (C) 2015 Freie Universität Berlin * * This file is subject to the terms and conditions of the GNU Lesser * General Public License v2.1. See the file LICENSE in the top level * directory for more details. */ /** * @ingroup drivers_at86rf2xx * @{ * * @file * @brief Implementation of public functions for AT86RF2xx drivers * * @author Alaeddine Weslati * @author Thomas Eichinger * @author Hauke Petersen * @author Kaspar Schleiser * @author Oliver Hahm * * @} */ #include "luid.h" #include "byteorder.h" #include "net/ieee802154.h" #include "net/gnrc.h" #include "at86rf2xx_registers.h" #include "at86rf2xx_internal.h" #include "at86rf2xx_netdev.h" #define ENABLE_DEBUG (0) #include "debug.h" void at86rf2xx_setup(at86rf2xx_t *dev, const at86rf2xx_params_t *params) { netdev_t *netdev = (netdev_t *)dev; netdev->driver = &at86rf2xx_driver; /* initialize device descriptor */ memcpy(&dev->params, params, sizeof(at86rf2xx_params_t)); dev->idle_state = AT86RF2XX_STATE_TRX_OFF; /* radio state is P_ON when first powered-on */ dev->state = AT86RF2XX_STATE_P_ON; dev->pending_tx = 0; } void at86rf2xx_reset(at86rf2xx_t *dev) { eui64_t addr_long; at86rf2xx_hardware_reset(dev); /* Reset state machine to ensure a known state */ if (dev->state == AT86RF2XX_STATE_P_ON) { at86rf2xx_set_state(dev, AT86RF2XX_STATE_FORCE_TRX_OFF); } /* reset options and sequence number */ dev->netdev.seq = 0; dev->netdev.flags = 0; /* get an 8-byte unique ID to use as hardware address */ luid_get(addr_long.uint8, IEEE802154_LONG_ADDRESS_LEN); /* make sure we mark the address as non-multicast and not globally unique */ addr_long.uint8[0] &= ~(0x01); addr_long.uint8[0] |= (0x02); /* set short and long address */ at86rf2xx_set_addr_long(dev, ntohll(addr_long.uint64.u64)); at86rf2xx_set_addr_short(dev, ntohs(addr_long.uint16[0].u16)); /* set default PAN id */ at86rf2xx_set_pan(dev, AT86RF2XX_DEFAULT_PANID); /* set default channel */ at86rf2xx_set_chan(dev, AT86RF2XX_DEFAULT_CHANNEL); /* set default TX power */ at86rf2xx_set_txpower(dev, AT86RF2XX_DEFAULT_TXPOWER); /* set default options */ at86rf2xx_set_option(dev, AT86RF2XX_OPT_AUTOACK, true); at86rf2xx_set_option(dev, AT86RF2XX_OPT_CSMA, true); at86rf2xx_set_option(dev, AT86RF2XX_OPT_TELL_RX_START, false); at86rf2xx_set_option(dev, AT86RF2XX_OPT_TELL_RX_END, true); #ifdef MODULE_NETSTATS_L2 at86rf2xx_set_option(dev, AT86RF2XX_OPT_TELL_TX_END, true); #endif /* set default protocol */ #ifdef MODULE_GNRC_SIXLOWPAN dev->netdev.proto = GNRC_NETTYPE_SIXLOWPAN; #elif MODULE_GNRC dev->netdev.proto = GNRC_NETTYPE_UNDEF; #endif /* enable safe mode (protect RX FIFO until reading data starts) */ at86rf2xx_reg_write(dev, AT86RF2XX_REG__TRX_CTRL_2, AT86RF2XX_TRX_CTRL_2_MASK__RX_SAFE_MODE); #ifdef MODULE_AT86RF212B at86rf2xx_set_page(dev, 0); #endif /* don't populate masked interrupt flags to IRQ_STATUS register */ uint8_t tmp = at86rf2xx_reg_read(dev, AT86RF2XX_REG__TRX_CTRL_1); tmp &= ~(AT86RF2XX_TRX_CTRL_1_MASK__IRQ_MASK_MODE); at86rf2xx_reg_write(dev, AT86RF2XX_REG__TRX_CTRL_1, tmp); /* disable clock output to save power */ tmp = at86rf2xx_reg_read(dev, AT86RF2XX_REG__TRX_CTRL_0); tmp &= ~(AT86RF2XX_TRX_CTRL_0_MASK__CLKM_CTRL); tmp &= ~(AT86RF2XX_TRX_CTRL_0_MASK__CLKM_SHA_SEL); tmp |= (AT86RF2XX_TRX_CTRL_0_CLKM_CTRL__OFF); at86rf2xx_reg_write(dev, AT86RF2XX_REG__TRX_CTRL_0, tmp); /* enable interrupts */ at86rf2xx_reg_write(dev, AT86RF2XX_REG__IRQ_MASK, AT86RF2XX_IRQ_STATUS_MASK__TRX_END); /* clear interrupt flags */ at86rf2xx_reg_read(dev, AT86RF2XX_REG__IRQ_STATUS); /* go into RX state */ at86rf2xx_set_state(dev, AT86RF2XX_STATE_RX_AACK_ON); DEBUG("at86rf2xx_reset(): reset complete.\n"); } size_t at86rf2xx_send(at86rf2xx_t *dev, uint8_t *data, size_t len) { /* check data length */ if (len > AT86RF2XX_MAX_PKT_LENGTH) { DEBUG("[at86rf2xx] Error: data to send exceeds max packet size\n"); return 0; } at86rf2xx_tx_prepare(dev); at86rf2xx_tx_load(dev, data, len, 0); at86rf2xx_tx_exec(dev); return len; } void at86rf2xx_tx_prepare(at86rf2xx_t *dev) { uint8_t state; dev->pending_tx++; /* make sure ongoing transmissions are finished */ do { state = at86rf2xx_get_status(dev); } while (state == AT86RF2XX_STATE_BUSY_RX_AACK || state == AT86RF2XX_STATE_BUSY_TX_ARET); if (state != AT86RF2XX_STATE_TX_ARET_ON) { dev->idle_state = state; } at86rf2xx_set_state(dev, AT86RF2XX_STATE_TX_ARET_ON); dev->tx_frame_len = IEEE802154_FCS_LEN; } size_t at86rf2xx_tx_load(at86rf2xx_t *dev, uint8_t *data, size_t len, size_t offset) { dev->tx_frame_len += (uint8_t)len; at86rf2xx_sram_write(dev, offset + 1, data, len); return offset + len; } void at86rf2xx_tx_exec(at86rf2xx_t *dev) { netdev_t *netdev = (netdev_t *)dev; /* write frame length field in FIFO */ at86rf2xx_sram_write(dev, 0, &(dev->tx_frame_len), 1); /* trigger sending of pre-loaded frame */ at86rf2xx_reg_write(dev, AT86RF2XX_REG__TRX_STATE, AT86RF2XX_TRX_STATE__TX_START); if (netdev->event_callback && (dev->netdev.flags & AT86RF2XX_OPT_TELL_TX_START)) { netdev->event_callback(netdev, NETDEV_EVENT_TX_STARTED); } } bool at86rf2xx_cca(at86rf2xx_t *dev) { uint8_t reg; uint8_t old_state = at86rf2xx_set_state(dev, AT86RF2XX_STATE_TRX_OFF); /* Disable RX path */ uint8_t rx_syn = at86rf2xx_reg_read(dev, AT86RF2XX_REG__RX_SYN); reg = rx_syn | AT86RF2XX_RX_SYN__RX_PDT_DIS; at86rf2xx_reg_write(dev, AT86RF2XX_REG__RX_SYN, reg); /* Manually triggered CCA is only possible in RX_ON (basic operating mode) */ at86rf2xx_set_state(dev, AT86RF2XX_STATE_RX_ON); /* Perform CCA */ reg = at86rf2xx_reg_read(dev, AT86RF2XX_REG__PHY_CC_CCA); reg |= AT86RF2XX_PHY_CC_CCA_MASK__CCA_REQUEST; at86rf2xx_reg_write(dev, AT86RF2XX_REG__PHY_CC_CCA, reg); /* Spin until done (8 symbols + 12 µs = 128 µs + 12 µs for O-QPSK)*/ do { reg = at86rf2xx_reg_read(dev, AT86RF2XX_REG__TRX_STATUS); } while ((reg & AT86RF2XX_TRX_STATUS_MASK__CCA_DONE) == 0); /* return true if channel is clear */ bool ret = !!(reg & AT86RF2XX_TRX_STATUS_MASK__CCA_STATUS); /* re-enable RX */ at86rf2xx_reg_write(dev, AT86RF2XX_REG__RX_SYN, rx_syn); /* Step back to the old state */ at86rf2xx_set_state(dev, AT86RF2XX_STATE_TRX_OFF); at86rf2xx_set_state(dev, old_state); return ret; }