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at86rf2xx.c
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/*
* Copyright (C) 2013 Alaeddine Weslati <[email protected]>
* Copyright (C) 2015 Freie Universität Berlin
* 2017 HAW Hamburg
*
* 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 <[email protected]>
* @author Thomas Eichinger <[email protected]>
* @author Hauke Petersen <[email protected]>
* @author Kaspar Schleiser <[email protected]>
* @author Oliver Hahm <[email protected]>
* @author Sebastian Meiling <[email protected]>
* @}
*/
#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));
/* State to return after receiving or transmitting */
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);
netdev_ieee802154_reset(&dev->netdev);
/* Reset state machine to ensure a known state */
if (dev->state == AT86RF2XX_STATE_P_ON) {
at86rf2xx_set_state(dev, AT86RF2XX_STATE_FORCE_TRX_OFF);
}
/* 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);
static const netopt_enable_t enable = NETOPT_ENABLE;
netdev_ieee802154_set(&dev->netdev, NETOPT_ACK_REQ,
&enable, sizeof(enable));
/* 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, AT86RF2XX_DEFAULT_PAGE);
#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);
/* configure smart idle listening feature */
#if AT86RF2XX_SMART_IDLE_LISTENING
tmp = at86rf2xx_reg_read(dev, AT86RF2XX_REG__TRX_RPC);
tmp |= (AT86RF2XX_TRX_RPC_MASK__RX_RPC_EN |
AT86RF2XX_TRX_RPC_MASK__PDT_RPC_EN |
AT86RF2XX_TRX_RPC_MASK__PLL_RPC_EN |
AT86RF2XX_TRX_RPC_MASK__XAH_TX_RPC_EN |
AT86RF2XX_TRX_RPC_MASK__IPAN_RPC_EN);
at86rf2xx_reg_write(dev, AT86RF2XX_REG__TRX_RPC, tmp);
at86rf2xx_set_rxsensitivity(dev, RSSI_BASE_VAL);
#endif
/* 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);
/* State to return after receiving or transmitting */
dev->idle_state = AT86RF2XX_STATE_RX_AACK_ON;
/* 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, const 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++;
state = at86rf2xx_set_state(dev, AT86RF2XX_STATE_TX_ARET_ON);
if (state != AT86RF2XX_STATE_TX_ARET_ON) {
dev->idle_state = state;
}
dev->tx_frame_len = IEEE802154_FCS_LEN;
}
size_t at86rf2xx_tx_load(at86rf2xx_t *dev, const 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(const 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->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;
}