/* * This file is part of the libsigrok project. * * Copyright (C) 2014 Daniel Elstner * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program 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 General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #ifndef LIBSIGROK_HARDWARE_SYSCLK_LWLA_PROTOCOL_H #define LIBSIGROK_HARDWARE_SYSCLK_LWLA_PROTOCOL_H /* Message logging helpers with subsystem-specific prefix string. */ #define LOG_PREFIX "sysclk-lwla" #include "lwla.h" #include "libsigrok.h" #include "libsigrok-internal.h" #include #include /* For now, only the LWLA1034 is supported. */ #define VENDOR_NAME "SysClk" #define MODEL_NAME "LWLA1034" #define USB_VID_PID "2961.6689" #define USB_INTERFACE 0 #define USB_TIMEOUT 3000 /* ms */ #define NUM_PROBES 34 #define TRIGGER_TYPES "01fr" /** Unit and packet size for the sigrok logic datafeed. */ #define UNIT_SIZE ((NUM_PROBES + 7) / 8) #define PACKET_LENGTH 10000 /* units */ /** Size of the acquisition buffer in device memory units. */ #define MEMORY_DEPTH (256 * 1024) /* 256k x 36 bit */ /** Number of device memory units (36 bit) to read at a time. Slices of 8 * consecutive 36-bit words are mapped to 9 32-bit words each, so the chunk * length should be a multiple of 8 to ensure alignment to slice boundaries. * * Experimentation has shown that reading chunks larger than about 1024 bytes * is unreliable. The threshold seems to relate to the buffer size on the FX2 * USB chip: The configured endpoint buffer size is 512, and with double or * triple buffering enabled a multiple of 512 bytes can be kept in fly. * * The vendor software limits reads to 120 words (15 slices, 540 bytes) at * a time. So far, it appears safe to increase this to 224 words (28 slices, * 1008 bytes), thus making the most of two 512 byte buffers. */ #define READ_CHUNK_LEN (28 * 8) /** Calculate the required buffer size in 16-bit units for reading a given * number of device memory words. Rounded to a multiple of 8 device words. */ #define LWLA1034_MEMBUF_LEN(count) (((count) + 7) / 8 * 18) /** Maximum number of 16-bit words sent at a time during acquisition. * Used for allocating the libusb transfer buffer. */ #define MAX_ACQ_SEND_WORDS 8 /* 5 for memory read request plus stuffing */ /** Maximum number of 16-bit words received at a time during acquisition. * Round to the next multiple of the endpoint buffer size to avoid nasty * transfer overflow conditions on hiccups. */ #define MAX_ACQ_RECV_WORDS ((READ_CHUNK_LEN / 4 * 9 + 255) / 256 * 256) /** Maximum length of a register write sequence. */ #define MAX_REG_WRITE_SEQ_LEN 5 /** Default configured samplerate. */ #define DEFAULT_SAMPLERATE SR_MHZ(125) /** Maximum configurable sample count limit. */ #define MAX_LIMIT_SAMPLES (UINT64_C(1) << 48) /** Maximum configurable capture duration in milliseconds. */ #define MAX_LIMIT_MSEC (UINT64_C(1) << 32) /** LWLA clock sources. */ enum clock_source { CLOCK_SOURCE_NONE, CLOCK_SOURCE_INT, CLOCK_SOURCE_EXT_RISE, CLOCK_SOURCE_EXT_FALL, }; /** LWLA device states. */ enum device_state { STATE_IDLE = 0, STATE_START_CAPTURE, STATE_STATUS_WAIT, STATE_STATUS_REQUEST, STATE_STATUS_RESPONSE, STATE_STOP_CAPTURE, STATE_LENGTH_REQUEST, STATE_LENGTH_RESPONSE, STATE_READ_PREPARE, STATE_READ_REQUEST, STATE_READ_RESPONSE, STATE_READ_END, }; /** LWLA run-length encoding states. */ enum rle_state { RLE_STATE_DATA, RLE_STATE_LEN }; /** LWLA sample acquisition and decompression state. */ struct acquisition_state { uint64_t sample; uint64_t run_len; /** Maximum number of samples to process. */ uint64_t samples_max; /** Number of samples sent to the session bus. */ uint64_t samples_done; /** Maximum duration of capture, in milliseconds. */ uint64_t duration_max; /** Running capture duration since trigger event. */ uint64_t duration_now; /** Capture memory fill level. */ size_t mem_addr_fill; size_t mem_addr_done; size_t mem_addr_next; size_t mem_addr_stop; size_t out_index; struct libusb_transfer *xfer_in; struct libusb_transfer *xfer_out; unsigned int capture_flags; enum rle_state rle; /** Whether to bypass the clock divider. */ gboolean bypass_clockdiv; /* Payload data buffers for outgoing and incoming transfers. */ uint16_t xfer_buf_out[MAX_ACQ_SEND_WORDS]; uint16_t xfer_buf_in[MAX_ACQ_RECV_WORDS]; /* Payload buffer for sigrok logic packets. */ uint8_t out_packet[PACKET_LENGTH * UNIT_SIZE]; }; /** Private, per-device-instance driver context. */ struct dev_context { /** The samplerate selected by the user. */ uint64_t samplerate; /** The maximimum sampling duration, in milliseconds. */ uint64_t limit_msec; /** The maximimum number of samples to acquire. */ uint64_t limit_samples; /** Channels to use. */ uint64_t channel_mask; uint64_t trigger_mask; uint64_t trigger_edge_mask; uint64_t trigger_values; struct acquisition_state *acquisition; struct regval_pair reg_write_seq[MAX_REG_WRITE_SEQ_LEN]; int reg_write_pos; int reg_write_len; enum device_state state; /** The currently configured clock source of the device. */ enum clock_source cur_clock_source; /** The clock source selected by the user. */ enum clock_source selected_clock_source; /* Indicates that stopping the acquisition is currently in progress. */ gboolean stopping_in_progress; /* Indicates whether a transfer failed. */ gboolean transfer_error; }; SR_PRIV struct acquisition_state *lwla_alloc_acquisition_state(void); SR_PRIV void lwla_free_acquisition_state(struct acquisition_state *acq); SR_PRIV int lwla_init_device(const struct sr_dev_inst *sdi); SR_PRIV int lwla_set_clock_source(const struct sr_dev_inst *sdi); SR_PRIV int lwla_setup_acquisition(const struct sr_dev_inst *sdi); SR_PRIV int lwla_start_acquisition(const struct sr_dev_inst *sdi); SR_PRIV int lwla_abort_acquisition(const struct sr_dev_inst *sdi); SR_PRIV int lwla_receive_data(int fd, int revents, void *cb_data); #endif /* !LIBSIGROK_HARDWARE_SYSCLK_LWLA_PROTOCOL_H */