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/**
* The MIT License (MIT)
*
* Copyright (c) 2013 Paulo B. de Oliveira Filho <pauloborgesfilho@gmail.com>
* Copyright (c) 2013 Claudio Takahasi <claudio.takahasi@gmail.com>
* Copyright (c) 2013 João Paulo Rechi Vita <jprvita@gmail.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <string.h>
#include <nrf51.h>
#include <nrf51_bitfields.h>
#include "nrf51822.h"
#include "radio.h"
#define MAX_BUF_LEN (RADIO_MAX_PDU_LEN + 1) /* S0, LEN
and S1 occupies 3 bytes, not 2 */
#define STATUS_INITIALIZED 1
#define STATUS_RX 2
#define STATUS_BUSY STATUS_RX
static radio_handler handler;
static uint8_t buf[MAX_BUF_LEN];
static uint8_t status;
#define COMMON_INITIALIZATION(ch, aa, crc) \
do { \
int8_t freq; \
if (!(status & STATUS_INITIALIZED)) \
return -1; \
if (status & STATUS_BUSY) \
return -1; \
freq = ch2freq(ch); \
if (freq < 0) \
return -1; \
NRF_RADIO->DATAWHITEIV = ch & 0x3F; \
NRF_RADIO->FREQUENCY = freq; \
NRF_RADIO->BASE0 = (aa << 8) & 0xFFFFFF00; \
NRF_RADIO->PREFIX0 = (aa >> 24) & 0x000000FF; \
NRF_RADIO->CRCINIT = crc; \
} while (0)
static __inline int8_t ch2freq(uint8_t ch)
{
switch (ch) {
case 37:
return 2;
case 38:
return 26;
case 39:
return 80;
default:
if (ch > 39)
return -1;
else if (ch < 11)
return 4 + (2 * ch);
else
return 6 + (2 * ch);
}
}
void RADIO_IRQHandler(void)
{
struct radio_packet packet;
uint8_t old_status;
NRF_RADIO->EVENTS_END = 0UL;
old_status = status;
status = STATUS_INITIALIZED;
if ((old_status & STATUS_RX) && handler) {
packet.len = buf[1] + 2;
packet.crc = NRF_RADIO->CRCSTATUS;
packet.pdu[0] = buf[0];
packet.pdu[1] = ((buf[2] & 0x3) << 6) | (buf[1] & 0x3F);
memcpy(packet.pdu + 2, buf + 3, buf[1]);
handler(RADIO_EVT_RX_COMPLETED, &packet);
}
}
int16_t radio_recv(uint8_t ch, uint32_t aa, uint32_t crc)
{
COMMON_INITIALIZATION(ch, aa, crc);
NRF_RADIO->TASKS_RXEN = 1UL;
status |= STATUS_RX;
return 0;
}
int16_t radio_stop(void)
{
if (!(status & STATUS_BUSY))
return -1;
NRF_RADIO->EVENTS_DISABLED = 0UL;
NRF_RADIO->TASKS_DISABLE = 1UL;
while (NRF_RADIO->EVENTS_DISABLED == 0UL);
status &= ~STATUS_BUSY;
return 0;
}
void radio_register_handler(radio_handler hdlr)
{
handler = hdlr;
}
int16_t radio_init(void)
{
if (NRF_CLOCK->EVENTS_HFCLKSTARTED == 0UL) {
NRF_CLOCK->TASKS_HFCLKSTART = 1UL;
while (NRF_CLOCK->EVENTS_HFCLKSTARTED == 0UL);
}
NRF_RADIO->MODE = RADIO_MODE_MODE_Ble_1Mbit << RADIO_MODE_MODE_Pos;
NRF_RADIO->TXPOWER = RADIO_TXPOWER_TXPOWER_0dBm
<< RADIO_TXPOWER_TXPOWER_Pos;
NRF_RADIO->PCNF1 = (RADIO_PCNF1_WHITEEN_Enabled
<< RADIO_PCNF1_WHITEEN_Pos)
| (MAX_BUF_LEN << RADIO_PCNF1_MAXLEN_Pos)
| (3UL << RADIO_PCNF1_BALEN_Pos);
NRF_RADIO->RXADDRESSES = 1UL;
NRF_RADIO->TXADDRESS = 0UL;
NRF_RADIO->CRCCNF = (RADIO_CRCCNF_LEN_Three << RADIO_CRCCNF_LEN_Pos) |
(RADIO_CRCCNF_SKIP_ADDR_Skip << RADIO_CRCCNF_SKIP_ADDR_Pos);
NRF_RADIO->CRCPOLY = 0x100065B;
/* FIXME: These header sizes only works for advertise channel PDUs */
NRF_RADIO->PCNF0 = (1UL << RADIO_PCNF0_S0LEN_Pos) | /* 1 byte */
(6UL << RADIO_PCNF0_LFLEN_Pos) | /* 6 bits */
(2UL << RADIO_PCNF0_S1LEN_Pos); /* 2 bits */
NRF_RADIO->SHORTS = (RADIO_SHORTS_READY_START_Enabled
<< RADIO_SHORTS_READY_START_Pos)
| (RADIO_SHORTS_END_DISABLE_Enabled
<< RADIO_SHORTS_END_DISABLE_Pos);
NRF_RADIO->INTENSET = RADIO_INTENSET_END_Msk;
NVIC_SetPriority(RADIO_IRQn, IRQ_PRIORITY_HIGH);
NVIC_ClearPendingIRQ(RADIO_IRQn);
NVIC_EnableIRQ(RADIO_IRQn);
NRF_RADIO->PACKETPTR = (uint32_t) buf;
memset(buf, 0, sizeof(buf));
status = STATUS_INITIALIZED;
handler = NULL;
return 0;
}
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