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Diffstat (limited to 'Radio/HW/BladeRF/src/streaming/metadata.h')
| -rw-r--r-- | Radio/HW/BladeRF/src/streaming/metadata.h | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/Radio/HW/BladeRF/src/streaming/metadata.h b/Radio/HW/BladeRF/src/streaming/metadata.h new file mode 100644 index 0000000..e268559 --- /dev/null +++ b/Radio/HW/BladeRF/src/streaming/metadata.h @@ -0,0 +1,180 @@ +/* + * Copyright (C) 2014 Nuand LLC + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#ifndef STREAMING_METADATA_H_ +#define STREAMING_METADATA_H_ + +/* + * Metadata layout + * ~~~~~~~~~~~~~~~~~~~~~~~ + * + * The FPGA handles data in units of "messages." These messages are + * 1024 or 2048 bytes for USB 2.0 (Hi-Speed) or USB 3.0 (SuperSpeed), + * respectively. + * + * The first 16 bytes of the message form a header, which includes metadata + * for the samples within the message. This header is shown below: + * + * +-----------------+ + * 0x00 | Packet length | 2 bytes, Little-endian uint16_t + * +-----------------+ + * 0x02 | Packet flags | 1 byte + * +-----------------+ + * 0x03 | Packet core ID | 1 byte + * +-----------------+ + * 0x04 | Timestamp | 8 bytes, Little-endian uint64_t + * +-----------------+ + * 0x0c | Flags | 4 bytes, Little-endian uint32_t + * +-----------------+ + * + * The term "buffer" is used to describe a block of of data received from or + * sent to the device. The size of a "buffer" (in bytes) is always a multiple + * of the size of a "message." Said another way, a buffer will always evenly + * divide into multiple messages. Messages are *not* fragmented across + * consecutive buffers. + * + * +-----------------+ <-. <-. + * | header | | | + * +-----------------+ | | + * | | | | + * | samples | | | + * | | | | + * +-----------------+ | <-+---- message + * | header | | + * +-----------------+ | + * | | | + * | samples | | + * | | | + * +-----------------+ | + * | header | | + * +-----------------+ | + * | | | + * | samples | | + * | | | + * +-----------------+ | + * | header | | + * +-----------------+ | + * | | | + * | samples | | + * | | | + * +-----------------+ <-+---------- buffer + * + * + * When intentionally transmitting discontinuous groups of samples (such + * as bursts), it is important that the last two samples within a message + * be (0 + 0j). Otherwise, the DAC will not properly hold its output + * at (0 + 0j) for the duration of the discontinuity. + */ + +/* Components of the metadata header */ +#define METADATA_RESV_SIZE (sizeof(uint32_t)) +#define METADATA_TIMESTAMP_SIZE (sizeof(uint64_t)) +#define METADATA_FLAGS_SIZE (sizeof(uint32_t)) +#define METADATA_PACKET_LEN_SIZE (sizeof(uint16_t)) +#define METADATA_PACKET_CORE_SIZE (sizeof(uint8_t)) +#define METADATA_PACKET_FLAGS_SIZE (sizeof(uint8_t)) + +#define METADATA_RESV_OFFSET 0 +#define METADATA_PACKET_LEN_OFFSET 0 +#define METADATA_PACKET_FLAGS_OFFSET 2 +#define METADATA_PACKET_CORE_OFFSET 3 +#define METADATA_TIMESTAMP_OFFSET (METADATA_RESV_SIZE) +#define METADATA_FLAGS_OFFSET \ + (METADATA_TIMESTAMP_OFFSET + METADATA_TIMESTAMP_SIZE) + +#define METADATA_HEADER_SIZE (METADATA_FLAGS_OFFSET + METADATA_FLAGS_SIZE) + +static inline uint64_t metadata_get_timestamp(const uint8_t *header) +{ + uint64_t ret; + assert(sizeof(ret) == METADATA_TIMESTAMP_SIZE); + memcpy(&ret, &header[METADATA_TIMESTAMP_OFFSET], METADATA_TIMESTAMP_SIZE); + + ret = LE64_TO_HOST(ret); + + return ret; +} + +static inline uint32_t metadata_get_flags(const uint8_t *header) +{ + uint32_t ret; + assert(sizeof(ret) == METADATA_FLAGS_SIZE); + memcpy(&ret, &header[METADATA_FLAGS_OFFSET], METADATA_FLAGS_SIZE); + return LE32_TO_HOST(ret); +} + +static inline uint16_t metadata_get_packet_len(const uint8_t *header) +{ + uint16_t ret; + assert(sizeof(ret) == METADATA_PACKET_LEN_SIZE); + memcpy(&ret, &header[METADATA_PACKET_LEN_OFFSET], METADATA_PACKET_LEN_SIZE); + return LE16_TO_HOST(ret); +} + +static inline uint8_t metadata_get_packet_core(const uint8_t *header) +{ + uint8_t ret; + assert(sizeof(ret) == METADATA_PACKET_CORE_SIZE); + memcpy(&ret, &header[METADATA_PACKET_CORE_OFFSET], METADATA_PACKET_CORE_SIZE); + return ret; +} + +static inline uint8_t metadata_get_packet_flags(const uint8_t *header) +{ + uint8_t ret; + assert(sizeof(ret) == METADATA_PACKET_FLAGS_SIZE); + memcpy(&ret, &header[METADATA_PACKET_FLAGS_OFFSET], METADATA_PACKET_FLAGS_SIZE); + return ret; +} + +static inline void metadata_set_packet(uint8_t *header, + uint64_t timestamp, + uint32_t flags, + uint16_t length, + uint8_t core, + uint8_t pkt_flags) +{ + timestamp = HOST_TO_LE64(timestamp); + + flags = HOST_TO_LE32(flags); + + length = HOST_TO_LE16(length); + + assert(sizeof(timestamp) == METADATA_TIMESTAMP_SIZE); + assert(sizeof(flags) == METADATA_FLAGS_SIZE); + + memset(&header[METADATA_RESV_OFFSET], 0, METADATA_RESV_SIZE); + + memcpy(&header[METADATA_PACKET_LEN_OFFSET], &length, METADATA_PACKET_LEN_SIZE); + memcpy(&header[METADATA_PACKET_CORE_OFFSET], &core, METADATA_PACKET_CORE_SIZE); + memcpy(&header[METADATA_PACKET_FLAGS_OFFSET], &pkt_flags, METADATA_PACKET_FLAGS_SIZE); + + memcpy(&header[METADATA_TIMESTAMP_OFFSET], ×tamp, + METADATA_TIMESTAMP_SIZE); + + memcpy(&header[METADATA_FLAGS_OFFSET], &flags, METADATA_FLAGS_SIZE); +} + +static inline void metadata_set(uint8_t *header, + uint64_t timestamp, + uint32_t flags) +{ + metadata_set_packet(header, timestamp, flags, 0, 0, 0); +} + +#endif |