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a2ba22dd0f
RIOT/cpu/cc2538/radio/cc2538_rf_netdev.c
Aaron Sowry a2ba22dd0f cpu/cc2538: Add RF driver
2016-07-13 14:19:45 +12:00

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/*
* Copyright (C) 2016 MUTEX NZ Ltd
*
* 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 cpu_cc2538
* @{
*
* @file
* @brief Netdev adaption for the CC2538 RF driver
*
* @author Aaron Sowry <aaron@mutex.nz>
*
* @}
*/
#include <errno.h>
#include "net/gnrc.h"
#include "net/netdev2.h"
#include "cc2538_rf.h"
#include "cc2538_rf_netdev.h"
#include "cc2538_rf_internal.h"
#define ENABLE_DEBUG (0)
#include "debug.h"
#define _MAX_MHR_OVERHEAD (25)
static int _get(netdev2_t *dev, netopt_t opt, void *value, size_t max_len);
static int _set(netdev2_t *dev, netopt_t opt, void *value, size_t value_len);
static int _send(netdev2_t *netdev, const struct iovec *vector, int count);
static int _recv(netdev2_t *netdev, char *buf, int len, void *info);
static void _isr(netdev2_t *netdev);
static int _init(netdev2_t *dev);
const netdev2_driver_t cc2538_rf_driver = {
.get = _get,
.set = _set,
.send = _send,
.recv = _recv,
.isr = _isr,
.init = _init,
};
/* Reference pointer for the IRQ handler */
static netdev2_t *_dev;
void _irq_handler(void)
{
if (_dev->event_callback) {
_dev->event_callback(_dev, NETDEV2_EVENT_ISR);
}
}
static int _get(netdev2_t *netdev, netopt_t opt, void *value, size_t max_len)
{
cc2538_rf_t *dev = (cc2538_rf_t *)netdev;
if (dev == NULL) {
return -ENODEV;
}
switch (opt) {
case NETOPT_AUTOACK:
if (RFCORE->XREG_FRMCTRL0bits.AUTOACK) {
*((netopt_enable_t *)value) = NETOPT_ENABLE;
}
else {
*((netopt_enable_t *)value) = NETOPT_DISABLE;
}
return sizeof(netopt_enable_t);
case NETOPT_CHANNEL_PAGE:
if (max_len < sizeof(uint16_t)) {
return -EOVERFLOW;
}
/* This tranceiver only supports page 0 */
*((uint16_t *)value) = 0;
return sizeof(uint16_t);
case NETOPT_DEVICE_TYPE:
if (max_len < sizeof(uint16_t)) {
return -EOVERFLOW;
}
*((uint16_t *) value) = NETDEV2_TYPE_IEEE802154;
return sizeof(uint16_t);
case NETOPT_IS_CHANNEL_CLR:
if (cc2538_channel_clear()) {
*((netopt_enable_t *)value) = NETOPT_ENABLE;
}
else {
*((netopt_enable_t *)value) = NETOPT_DISABLE;
}
return sizeof(netopt_enable_t);
case NETOPT_IS_WIRED:
return -ENOTSUP;
case NETOPT_MAX_PACKET_SIZE:
if (max_len < sizeof(int16_t)) {
return -EOVERFLOW;
}
*((uint16_t *)value) = CC2538_RF_MAX_DATA_LEN - _MAX_MHR_OVERHEAD;
return sizeof(uint16_t);
case NETOPT_PROMISCUOUSMODE:
if (cc2538_get_monitor()) {
*((netopt_enable_t *)value) = NETOPT_ENABLE;
}
else {
*((netopt_enable_t *)value) = NETOPT_DISABLE;
}
return sizeof(netopt_enable_t);
case NETOPT_STATE:
if (max_len < sizeof(netopt_state_t)) {
return -EOVERFLOW;
}
*((netopt_state_t *)value) = dev->state;
return sizeof(netopt_state_t);
case NETOPT_TX_POWER:
if (max_len < sizeof(int16_t)) {
return -EOVERFLOW;
}
*((uint16_t *)value) = cc2538_get_tx_power();
return sizeof(uint16_t);
default:
break;
}
int res;
if (((res = netdev2_ieee802154_get((netdev2_ieee802154_t *)netdev, opt, value,
max_len)) >= 0) || (res != -ENOTSUP)) {
return res;
}
return -ENOTSUP;
}
static int _set(netdev2_t *netdev, netopt_t opt, void *value, size_t value_len)
{
cc2538_rf_t *dev = (cc2538_rf_t *)netdev;
int res = -ENOTSUP;
if (dev == NULL) {
return -ENODEV;
}
switch (opt) {
case NETOPT_ADDRESS:
if (value_len > sizeof(uint16_t)) {
res = -EOVERFLOW;
}
else {
cc2538_set_addr_short(*((uint16_t*)value));
}
break;
case NETOPT_ADDRESS_LONG:
if (value_len > sizeof(uint64_t)) {
res = -EOVERFLOW;
}
else {
cc2538_set_addr_long(*((uint64_t*)value));
}
break;
case NETOPT_AUTOACK:
RFCORE->XREG_FRMCTRL0bits.AUTOACK = ((bool *)value)[0];
res = sizeof(netopt_enable_t);
break;
case NETOPT_CHANNEL:
if (value_len != sizeof(uint16_t)) {
res = -EINVAL;
}
else {
uint8_t chan = ((uint8_t *)value)[0];
if (chan < IEEE802154_MIN_CHANNEL ||
chan > IEEE802154_MAX_CHANNEL) {
res = -EINVAL;
}
else {
cc2538_set_chan(chan);
}
}
break;
case NETOPT_CHANNEL_PAGE:
/* This tranceiver only supports page 0 */
if (value_len != sizeof(uint16_t) ||
*((uint16_t *)value) != 0 ) {
res = -EINVAL;
}
else {
res = sizeof(uint16_t);
}
break;
case NETOPT_IS_WIRED:
return -ENOTSUP;
case NETOPT_NID:
if (value_len > sizeof(uint16_t)) {
res = -EOVERFLOW;
}
else {
cc2538_set_pan(*((uint16_t *)value));
}
break;
case NETOPT_PROMISCUOUSMODE:
cc2538_set_monitor(((bool *)value)[0]);
res = sizeof(netopt_enable_t);
break;
case NETOPT_STATE:
if (value_len > sizeof(netopt_state_t)) {
return -EOVERFLOW;
}
cc2538_set_state(dev, *((netopt_state_t *)value));
res = sizeof(netopt_state_t);
break;
case NETOPT_TX_POWER:
if (value_len > sizeof(int16_t)) {
return -EOVERFLOW;
}
cc2538_set_tx_power(*((int16_t *)value));
res = sizeof(uint16_t);
break;
default:
break;
}
if (res == -ENOTSUP) {
res = netdev2_ieee802154_set((netdev2_ieee802154_t *)netdev, opt,
value, value_len);
}
return res;
}
static int _send(netdev2_t *netdev, const struct iovec *vector, int count)
{
int pkt_len = 0;
cc2538_rf_t *dev = (cc2538_rf_t *) netdev;
mutex_lock(&dev->mutex);
/* Flush TX FIFO */
RFCORE_SFR_RFST = ISFLUSHTX;
/* The first byte of the TX FIFO must be the packet length,
but we don't know what it is yet. Write a null byte to the
start of the FIFO, so we can come back and update it later */
rfcore_write_byte(0);
for (int i = 0; i < count; i++) {
pkt_len += vector[i].iov_len;
if (pkt_len > CC2538_RF_MAX_DATA_LEN) {
DEBUG("cc2538_rf: packet too large (%u > %u)\n",
pkt_len, CC2538_RF_MAX_DATA_LEN);
return -EOVERFLOW;
}
rfcore_write_fifo(vector[i].iov_base, vector[i].iov_len);
}
/* Set first byte of TX FIFO to the packet length */
rfcore_poke_tx_fifo(0, pkt_len + CC2538_AUTOCRC_LEN);
RFCORE_SFR_RFST = ISTXON;
mutex_unlock(&dev->mutex);
return pkt_len;
}
static int _recv(netdev2_t *netdev, char *buf, int len, void *info)
{
cc2538_rf_t *dev = (cc2538_rf_t *) netdev;
size_t pkt_len;
mutex_lock(&dev->mutex);
if (buf == NULL) {
/* GNRC wants to know how much data we've got for it */
pkt_len = rfcore_read_byte();
/* If the value of the first byte of the RX FIFO does not correspond
to the amount of data received, then drop the packet. */
if (pkt_len != RFCORE_XREG_RXFIFOCNT) {
RFCORE_SFR_RFST = ISFLUSHRX;
mutex_unlock(&dev->mutex);
return -EOVERFLOW;
}
if (len > 0) {
/* GNRC wants us to drop the packet */
RFCORE_SFR_RFST = ISFLUSHRX;
}
mutex_unlock(&dev->mutex);
return pkt_len - IEEE802154_FCS_LEN;
}
else {
/* GNRC is expecting len bytes of data */
pkt_len = len;
}
rfcore_read_fifo(buf, pkt_len);
if (info != NULL) {
netdev2_ieee802154_rx_info_t *radio_info = info;
radio_info->rssi = rfcore_read_byte();
/* This is not strictly 802.15.4 compliant, since according to
the CC2538 documentation, this value will tend between ~50
for the lowest quality link detectable by the receiver, and
~110 for the highest. The IEEE 802.15.4 spec mandates that
this value be between 0-255, with 0 as lowest quality and
255 as the highest. FIXME. */
radio_info->lqi = rfcore_read_byte() & 0x7F;
}
RFCORE_SFR_RFST = ISFLUSHRX;
mutex_unlock(&dev->mutex);
return pkt_len;
}
static void _isr(netdev2_t *netdev)
{
netdev->event_callback(netdev, NETDEV2_EVENT_RX_COMPLETE);
}
static int _init(netdev2_t *netdev)
{
cc2538_rf_t *dev = (cc2538_rf_t *) netdev;
_dev = netdev;
mutex_lock(&dev->mutex);
uint16_t pan = cc2538_get_pan();
uint16_t chan = cc2538_get_chan();
uint16_t addr_short = cc2538_get_addr_short();
uint64_t addr_long = cc2538_get_addr_long();
/* Initialise netdev2_ieee802154_t struct */
netdev2_ieee802154_set((netdev2_ieee802154_t *)netdev, NETOPT_NID,
&pan, sizeof(pan));
netdev2_ieee802154_set((netdev2_ieee802154_t *)netdev, NETOPT_CHANNEL,
&chan, sizeof(chan));
netdev2_ieee802154_set((netdev2_ieee802154_t *)netdev, NETOPT_ADDRESS,
&addr_short, sizeof(addr_short));
netdev2_ieee802154_set((netdev2_ieee802154_t *)netdev, NETOPT_ADDRESS_LONG,
&addr_long, sizeof(addr_long));
cc2538_set_state(dev, NETOPT_STATE_IDLE);
/* set default protocol */
#ifdef MODULE_GNRC_SIXLOWPAN
dev->netdev.proto = GNRC_NETTYPE_SIXLOWPAN;
#elif MODULE_GNRC
dev->netdev.proto = GNRC_NETTYPE_UNDEF;
#endif
mutex_unlock(&dev->mutex);
return 0;
}
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