From: Vincent Palatin Date: Tue, 24 Jun 2014 23:35:48 +0000 (-0700) Subject: CHROMIUM: Add driver for Chromium Twinkie dongle X-Git-Tag: twinkie-0.5.0-v2~1 X-Git-Url: https://sigrok.org/gitaction?a=commitdiff_plain;h=744e43bc8d20c4d5562635185301f316f75a367f;p=libsigrok.git CHROMIUM: Add driver for Chromium Twinkie dongle Add the hardware driver to acquire both Control Channels using the Chromium "Twinkie" dongle. Signed-off-by: Vincent Palatin --- diff --git a/Makefile.am b/Makefile.am index c9842295..e8c8e40f 100644 --- a/Makefile.am +++ b/Makefile.am @@ -248,6 +248,12 @@ src_libdrivers_la_SOURCES += \ src/hardware/center-3xx/protocol.c \ src/hardware/center-3xx/api.c endif +if HW_CHROMIUM_TWINKIE +src_libdrivers_la_SOURCES += \ + src/hardware/chromium-twinkie/protocol.h \ + src/hardware/chromium-twinkie/protocol.c \ + src/hardware/chromium-twinkie/api.c +endif if HW_CHRONOVU_LA src_libdrivers_la_SOURCES += \ src/hardware/chronovu-la/protocol.h \ diff --git a/configure.ac b/configure.ac index 8282434b..0d32f520 100644 --- a/configure.ac +++ b/configure.ac @@ -230,6 +230,7 @@ SR_DRIVER([Brymen BM86x], [brymen-bm86x], [libusb]) SR_DRIVER([Brymen DMM], [brymen-dmm], [libserialport]) SR_DRIVER([CEM DT-885x], [cem-dt-885x], [libserialport]) SR_DRIVER([Center 3xx], [center-3xx], [libserialport]) +SR_DRIVER([Chromium Twinkie], [chromium-twinkie], [libusb]) SR_DRIVER([ChronoVu LA], [chronovu-la], [libusb libftdi]) SR_DRIVER([Colead SLM], [colead-slm], [libserialport]) SR_DRIVER([Conrad DIGI 35 CPU], [conrad-digi-35-cpu], [libserialport]) diff --git a/contrib/z60_libsigrok.rules b/contrib/z60_libsigrok.rules index 0dff4353..67b184ac 100644 --- a/contrib/z60_libsigrok.rules +++ b/contrib/z60_libsigrok.rules @@ -45,6 +45,9 @@ ATTRS{idVendor}=="16d0", ATTRS{idProduct}=="0498", MODE="660", GROUP="plugdev", # CEM DT-8852 ATTRS{idVendor}=="10c4", ATTRS{idProduct}=="ea60", MODE="660", GROUP="plugdev", TAG+="uaccess" +# Chromium Twinkie dongle +ATTRS{idVendor}=="18d1", ATTRS{idProduct}=="500a", MODE="664", GROUP="plugdev" + # ChronoVu LA8 (new VID/PID) # ChronoVu LA16 (new VID/PID) ATTRS{idVendor}=="0403", ATTRS{idProduct}=="8867", MODE="660", GROUP="plugdev", TAG+="uaccess" diff --git a/src/hardware/chromium-twinkie/api.c b/src/hardware/chromium-twinkie/api.c new file mode 100644 index 00000000..7e9f20a8 --- /dev/null +++ b/src/hardware/chromium-twinkie/api.c @@ -0,0 +1,524 @@ +/* + * This file is part of the libsigrok project. + * + * Copyright 2014 Google, Inc + * + * 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 2 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 . + */ + +#include +#include +#include +#include +#include +#include +#include "libsigrok-internal.h" +#include "protocol.h" + +#define TWINKIE_VID 0x18d1 +#define TWINKIE_PID 0x500a + +#define USB_INTERFACE 1 +#define USB_CONFIGURATION 1 + +#define MAX_RENUM_DELAY_MS 3000 +#define NUM_SIMUL_TRANSFERS 32 + +#define SAMPLE_RATE SR_KHZ(2400) + +static const int32_t hwopts[] = { + SR_CONF_CONN, +}; + +static const int32_t hwcaps[] = { + SR_CONF_LOGIC_ANALYZER, + SR_CONF_CONTINUOUS, + SR_CONF_CONN | SR_CONF_GET, + SR_CONF_SAMPLERATE | SR_CONF_GET, + SR_CONF_LIMIT_SAMPLES | SR_CONF_SET, +}; + +static const struct chan { + char *name; + int type; +} chan_defs[] = { + {"CC1", SR_CHANNEL_LOGIC}, + {"CC2", SR_CHANNEL_LOGIC}, + + {NULL, 0} +}; + +static GSList *scan(struct sr_dev_driver *di, GSList *options) +{ + struct drv_context *drvc; + struct dev_context *devc; + struct sr_dev_inst *sdi; + struct sr_usb_dev_inst *usb; + struct sr_channel *ch; + struct sr_config *src; + GSList *l, *devices, *conn_devices; + struct libusb_device_descriptor des; + libusb_device **devlist; + int ret, i, j; + const char *conn; + char connection_id[64]; + + drvc = di->context; + + conn = NULL; + for (l = options; l; l = l->next) { + src = l->data; + switch (src->key) { + case SR_CONF_CONN: + conn = g_variant_get_string(src->data, NULL); + break; + } + } + if (conn) + conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn); + else + conn_devices = NULL; + + /* Find all Twinkie devices */ + devices = NULL; + libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist); + for (i = 0; devlist[i]; i++) { + if (conn) { + usb = NULL; + for (l = conn_devices; l; l = l->next) { + usb = l->data; + if (usb->bus == libusb_get_bus_number(devlist[i]) + && usb->address == libusb_get_device_address(devlist[i])) + break; + } + if (!l) + /* This device matched none of the ones that + * matched the conn specification. */ + continue; + } + + if ((ret = libusb_get_device_descriptor(devlist[i], &des)) != 0) { + sr_warn("Failed to get device descriptor: %s.", + libusb_error_name(ret)); + continue; + } + + if (des.idVendor != TWINKIE_VID || des.idProduct != TWINKIE_PID) + continue; + + usb_get_port_path(devlist[i], connection_id, sizeof(connection_id)); + + sdi = g_malloc0(sizeof(struct sr_dev_inst)); + sdi->status = SR_ST_INITIALIZING; + sdi->vendor = g_strdup("Chromium"); + sdi->model = g_strdup("Twinkie"); + sdi->driver = di; + sdi->connection_id = g_strdup(connection_id); + + for (j = 0; chan_defs[j].name; j++) + if (!(ch = sr_channel_new(sdi, j, chan_defs[j].type, + TRUE, chan_defs[j].name))) + return NULL; + + if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) + return NULL; + sdi->priv = devc; + drvc->instances = g_slist_append(drvc->instances, sdi); + devices = g_slist_append(devices, sdi); + + sr_dbg("Found a Twinkie dongle."); + sdi->status = SR_ST_INACTIVE; + sdi->inst_type = SR_INST_USB; + sdi->conn = sr_usb_dev_inst_new( + libusb_get_bus_number(devlist[i]), + libusb_get_device_address(devlist[i]), NULL); + } + libusb_free_device_list(devlist, 1); + g_slist_free_full(conn_devices, (GDestroyNotify)sr_usb_dev_inst_free); + + return devices; +} + +static int twinkie_dev_open(struct sr_dev_inst *sdi) +{ + struct sr_dev_driver *di; + libusb_device **devlist; + struct sr_usb_dev_inst *usb; + struct libusb_device_descriptor des; + struct drv_context *drvc; + int ret, i, device_count; + char connection_id[64]; + + di = sdi->driver; + drvc = di->context; + usb = sdi->conn; + + if (sdi->status == SR_ST_ACTIVE) + /* Device is already in use. */ + return SR_ERR; + + device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist); + if (device_count < 0) { + sr_err("Failed to get device list: %s.", + libusb_error_name(device_count)); + return SR_ERR; + } + + for (i = 0; i < device_count; i++) { + if ((ret = libusb_get_device_descriptor(devlist[i], &des))) { + sr_err("Failed to get device descriptor: %s.", + libusb_error_name(ret)); + continue; + } + + if (des.idVendor != TWINKIE_VID || des.idProduct != TWINKIE_PID) + continue; + + if ((sdi->status == SR_ST_INITIALIZING) || + (sdi->status == SR_ST_INACTIVE)) { + /* + * Check device by its physical USB bus/port address. + */ + usb_get_port_path(devlist[i], connection_id, sizeof(connection_id)); + if (strcmp(sdi->connection_id, connection_id)) + /* This is not the one. */ + continue; + } + + if (!(ret = libusb_open(devlist[i], &usb->devhdl))) { + if (usb->address == 0xff) + /* + * First time we touch this device after FW + * upload, so we don't know the address yet. + */ + usb->address = libusb_get_device_address(devlist[i]); + } else { + sr_err("Failed to open device: %s.", + libusb_error_name(ret)); + break; + } + + ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE); + if (ret == LIBUSB_ERROR_BUSY) { + sr_err("Unable to claim USB interface. Another " + "program or driver has already claimed it."); + break; + } else if (ret == LIBUSB_ERROR_NO_DEVICE) { + sr_err("Device has been disconnected."); + break; + } else if (ret != 0) { + sr_err("Unable to claim interface: %s.", + libusb_error_name(ret)); + break; + } + + if ((ret = twinkie_init_device(sdi)) != SR_OK) { + sr_err("Failed to init device."); + break; + } + + sdi->status = SR_ST_ACTIVE; + sr_info("Opened device %d.%d, interface %d.", + usb->bus, usb->address, USB_INTERFACE); + + break; + } + libusb_free_device_list(devlist, 1); + + if (sdi->status != SR_ST_ACTIVE) { + if (usb->devhdl) { + libusb_release_interface(usb->devhdl, USB_INTERFACE); + libusb_close(usb->devhdl); + usb->devhdl = NULL; + } + return SR_ERR; + } + + return SR_OK; +} + +static int dev_open(struct sr_dev_inst *sdi) +{ + int ret; + + ret = twinkie_dev_open(sdi); + if (ret != SR_OK) { + sr_err("Unable to open device."); + return SR_ERR; + } + + return SR_OK; +} + +static int dev_close(struct sr_dev_inst *sdi) +{ + struct sr_usb_dev_inst *usb; + + usb = sdi->conn; + if (usb->devhdl == NULL) + return SR_ERR; + + sr_info("Closing device %d.%d interface %d.", + usb->bus, usb->address, USB_INTERFACE); + libusb_release_interface(usb->devhdl, USB_INTERFACE); + libusb_close(usb->devhdl); + usb->devhdl = NULL; + sdi->status = SR_ST_INACTIVE; + + return SR_OK; +} + +static int dev_clear(const struct sr_dev_driver *di) +{ + return std_dev_clear(di, NULL); +} + +static int config_get(uint32_t key, GVariant **data, + const struct sr_dev_inst *sdi, + const struct sr_channel_group *cg) +{ + struct sr_usb_dev_inst *usb; + char str[128]; + int ret; + + (void)cg; + + ret = SR_OK; + switch (key) { + case SR_CONF_CONN: + if (!sdi || !sdi->conn) + return SR_ERR_ARG; + usb = sdi->conn; + if (usb->address == 255) + /* Device still needs to re-enumerate after firmware + * upload, so we don't know its (future) address. */ + return SR_ERR; + snprintf(str, 128, "%d.%d", usb->bus, usb->address); + *data = g_variant_new_string(str); + break; + case SR_CONF_SAMPLERATE: + *data = g_variant_new_uint64(SAMPLE_RATE); + break; + default: + return SR_ERR_NA; + } + + return ret; +} + +static int config_set(uint32_t key, GVariant *data, + const struct sr_dev_inst *sdi, + const struct sr_channel_group *cg) +{ + struct dev_context *devc; + int ret; + + (void)cg; + + if (sdi->status != SR_ST_ACTIVE) + return SR_ERR_DEV_CLOSED; + + devc = sdi->priv; + + ret = SR_OK; + switch (key) { + case SR_CONF_LIMIT_SAMPLES: + devc->limit_samples = g_variant_get_uint64(data); + break; + default: + ret = SR_ERR_NA; + } + + return ret; +} + +static int config_list(uint32_t key, GVariant **data, + const struct sr_dev_inst *sdi, + const struct sr_channel_group *cg) +{ + int ret; + + (void)sdi; + (void)cg; + + ret = SR_OK; + switch (key) { + case SR_CONF_SCAN_OPTIONS: + *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32, + hwopts, ARRAY_SIZE(hwopts), sizeof(int32_t)); + break; + case SR_CONF_DEVICE_OPTIONS: + *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32, + hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_t)); + break; + default: + return SR_ERR_NA; + } + + return ret; +} + +static void abort_acquisition(struct dev_context *devc) +{ + int i; + + devc->sent_samples = -1; + + for (i = devc->num_transfers - 1; i >= 0; i--) { + if (devc->transfers[i]) + libusb_cancel_transfer(devc->transfers[i]); + } +} + +static int receive_data(int fd, int revents, void *cb_data) +{ + struct timeval tv; + struct dev_context *devc; + struct drv_context *drvc; + const struct sr_dev_inst *sdi; + struct sr_dev_driver *di; + + (void)fd; + (void)revents; + + sdi = cb_data; + di = sdi->driver; + drvc = di->context; + devc = sdi->priv; + + tv.tv_sec = tv.tv_usec = 0; + libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv); + + if (devc->sent_samples == -2) { + abort_acquisition(devc); + } + + return TRUE; +} + +static int dev_acquisition_start(const struct sr_dev_inst *sdi) +{ + struct sr_dev_driver *di = sdi->driver; + struct dev_context *devc; + struct drv_context *drvc; + struct sr_usb_dev_inst *usb; + struct libusb_transfer *transfer; + unsigned int i, timeout, num_transfers; + int ret; + unsigned char *buf; + size_t size, convsize; + + if (sdi->status != SR_ST_ACTIVE) + return SR_ERR_DEV_CLOSED; + + drvc = di->context; + devc = sdi->priv; + usb = sdi->conn; + + devc->sent_samples = 0; + /* reset per-CC context */ + memset(devc->cc, 0, sizeof(devc->cc)); + + timeout = 1000; + num_transfers = 10; + size = 10*1024; + convsize = size * 8 * 256 /* largest size : only rollbacks/no edges */; + devc->submitted_transfers = 0; + + devc->convbuffer_size = convsize; + if (!(devc->convbuffer = g_try_malloc(convsize))) { + sr_err("Conversion buffer malloc failed."); + return SR_ERR_MALLOC; + } + memset(devc->convbuffer, 0, devc->convbuffer_size); + + devc->transfers = g_try_malloc0(sizeof(*devc->transfers) * num_transfers); + if (!devc->transfers) { + sr_err("USB transfers malloc failed."); + g_free(devc->convbuffer); + return SR_ERR_MALLOC; + } + + devc->num_transfers = num_transfers; + for (i = 0; i < num_transfers; i++) { + if (!(buf = g_try_malloc(size))) { + sr_err("USB transfer buffer malloc failed."); + if (devc->submitted_transfers) + abort_acquisition(devc); + else { + g_free(devc->transfers); + g_free(devc->convbuffer); + } + return SR_ERR_MALLOC; + } + transfer = libusb_alloc_transfer(0); + libusb_fill_bulk_transfer(transfer, usb->devhdl, + 3 | LIBUSB_ENDPOINT_IN, buf, size, + twinkie_receive_transfer, (void *)sdi, timeout); + if ((ret = libusb_submit_transfer(transfer)) != 0) { + sr_err("Failed to submit transfer: %s.", + libusb_error_name(ret)); + libusb_free_transfer(transfer); + g_free(buf); + abort_acquisition(devc); + return SR_ERR; + } + devc->transfers[i] = transfer; + devc->submitted_transfers++; + } + + devc->ctx = drvc->sr_ctx; + + usb_source_add(sdi->session, devc->ctx, timeout, receive_data, + (void *)sdi); + + /* Send header packet to the session bus. */ + std_session_send_df_header(sdi); + + if ((ret = twinkie_start_acquisition(sdi)) != SR_OK) { + abort_acquisition(devc); + return ret; + } + + return SR_OK; +} + +static int dev_acquisition_stop(struct sr_dev_inst *sdi) +{ + if (sdi->status != SR_ST_ACTIVE) + return SR_ERR_DEV_CLOSED; + + abort_acquisition(sdi->priv); + + return SR_OK; +} + +static struct sr_dev_driver chromium_twinkie_driver_info = { + .name = "chromium-twinkie", + .longname = "Chromium Twinkie", + .api_version = 1, + .init = std_init, + .cleanup = std_cleanup, + .scan = scan, + .dev_list = std_dev_list, + .dev_clear = dev_clear, + .config_get = config_get, + .config_set = config_set, + .config_list = config_list, + .dev_open = dev_open, + .dev_close = dev_close, + .dev_acquisition_start = dev_acquisition_start, + .dev_acquisition_stop = dev_acquisition_stop, +}; +SR_REGISTER_DEV_DRIVER(chromium_twinkie_driver_info); diff --git a/src/hardware/chromium-twinkie/protocol.c b/src/hardware/chromium-twinkie/protocol.c new file mode 100644 index 00000000..e9d334d6 --- /dev/null +++ b/src/hardware/chromium-twinkie/protocol.c @@ -0,0 +1,248 @@ +/* + * This file is part of the libsigrok project. + * + * Copyright 2014 Google, Inc + * + * 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 2 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 . + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include "libsigrok-internal.h" +#include "protocol.h" + +SR_PRIV int twinkie_start_acquisition(const struct sr_dev_inst *sdi) +{ + (void)sdi; + + return SR_OK; +} + +SR_PRIV int twinkie_init_device(const struct sr_dev_inst *sdi) +{ + (void)sdi; + + return SR_OK; +} + +static void finish_acquisition(struct sr_dev_inst *sdi) +{ + struct sr_datafeed_packet packet; + struct dev_context *devc = sdi->priv; + + /* Terminate session. */ + packet.type = SR_DF_END; + sr_session_send(sdi, &packet); + + /* Remove fds from polling. */ + usb_source_remove(sdi->session, devc->ctx); + + devc->num_transfers = 0; + g_free(devc->transfers); + g_free(devc->convbuffer); +} + +static void free_transfer(struct libusb_transfer *transfer) +{ + struct sr_dev_inst *sdi; + struct dev_context *devc; + unsigned int i; + + sdi = transfer->user_data; + devc = sdi->priv; + + g_free(transfer->buffer); + transfer->buffer = NULL; + libusb_free_transfer(transfer); + + for (i = 0; i < devc->num_transfers; i++) { + if (devc->transfers[i] == transfer) { + devc->transfers[i] = NULL; + break; + } + } + + devc->submitted_transfers--; + if (devc->submitted_transfers == 0) + finish_acquisition(sdi); +} + +static void export_samples(const struct sr_dev_inst *sdi, size_t cnt) +{ + struct sr_datafeed_packet packet; + struct sr_datafeed_logic logic; + struct dev_context *devc = sdi->priv; + + /* export the received data */ + packet.type = SR_DF_LOGIC; + packet.payload = &logic; + if (devc->limit_samples && + cnt > devc->limit_samples - devc->sent_samples) + cnt = devc->limit_samples - devc->sent_samples; + logic.length = cnt; + logic.unitsize = 1; + logic.data = devc->convbuffer; + sr_session_send(sdi, &packet); + devc->sent_samples += cnt; +} + +static void expand_sample_data(const struct sr_dev_inst *sdi, + const uint8_t *src, size_t srccnt) +{ + struct dev_context *devc = sdi->priv; + int i, f; + size_t b; + size_t rdy_samples, left_samples; + int frames = srccnt / 64; + + for (f = 0; f < frames; f++) { + int ch = (src[1] >> 4) & 3; /* samples channel number */ + int bit = 1 << ch; /* channel bit mask */ + struct cc_context *cc = devc->cc + ch; + uint8_t *dest = devc->convbuffer + cc->idx; + + if (ch >= 2) /* only acquires CCx channels */ + continue; + + /* TODO: check timestamp, overflow, sequence number */ + + /* skip header, go to edges data */ + src+=4; + for (i = 0; i < 60; i++,src++) + if (*src == cc->prev_src) { + cc->rollbacks++; + } else { + uint8_t diff = *src - cc->prev_src; + int fixup = cc->rollbacks && (((int)*src < (int)cc->prev_src) || (*src == 0xff)); + size_t total = (fixup ? cc->rollbacks - 1 : cc->rollbacks) * 256 + diff; + + if (total + cc->idx > devc->convbuffer_size) { + sr_warn("overflow %d+%zd/%zd\n", + cc->idx, total, + devc->convbuffer_size); + /* reset current decoding */ + cc->rollbacks = 0; + break; + } + + /* insert bits in the buffer */ + if (cc->level) + for (b = 0 ; b < total ; b++, dest++) + *dest |= bit; + else + dest += total; + cc->idx += total; + + /* flip level on the next edge */ + cc->level = ~cc->level; + + cc->rollbacks = 0; + cc->prev_src = *src; + } + /* expand repeated rollbacks */ + if (cc->rollbacks > 1) { + size_t total = 256 * (cc->rollbacks - 1); + if (total + cc->idx > devc->convbuffer_size) { + sr_warn("overflow %d+%zd/%zd\n", + cc->idx, total, devc->convbuffer_size); + /* reset current decoding */ + total = 0; + } + /* insert bits in the buffer */ + if (cc->level) + for (b = 0 ; b < total ; b++, dest++) + *dest |= bit ; + cc->idx += total; + cc->rollbacks = 1; + } + } + + /* samples ready to be pushed (with both channels) */ + rdy_samples = MIN(devc->cc[0].idx, devc->cc[1].idx); + left_samples = MAX(devc->cc[0].idx, devc->cc[1].idx) - rdy_samples; + /* skip empty transfer */ + if (rdy_samples == 0) + return; + + export_samples(sdi, rdy_samples); + + /* clean up what we have sent */ + memmove(devc->convbuffer, devc->convbuffer + rdy_samples, left_samples); + memset(devc->convbuffer + left_samples, 0, rdy_samples); + devc->cc[0].idx -= rdy_samples; + devc->cc[1].idx -= rdy_samples; +} + +SR_PRIV void LIBUSB_CALL twinkie_receive_transfer(struct libusb_transfer *transfer) +{ + gboolean packet_has_error = FALSE; + struct sr_dev_inst *sdi; + struct dev_context *devc; + + sdi = transfer->user_data; + devc = sdi->priv; + + /* + * If acquisition has already ended, just free any queued up + * transfer that come in. + */ + if (devc->sent_samples < 0) { + free_transfer(transfer); + return; + } + + if (transfer->status || transfer->actual_length) + sr_info("receive_transfer(): status %d received %d bytes.", + transfer->status, transfer->actual_length); + + switch (transfer->status) { + case LIBUSB_TRANSFER_NO_DEVICE: + devc->sent_samples = -2; + free_transfer(transfer); + return; + case LIBUSB_TRANSFER_COMPLETED: + case LIBUSB_TRANSFER_TIMED_OUT: /* We may have received some data though. */ + break; + default: + packet_has_error = TRUE; + break; + } + + if (transfer->actual_length % 64) { + sr_err("Bad USB packet size."); + packet_has_error = TRUE; + } + + if (transfer->actual_length == 0 || packet_has_error) + goto resubmit; + + /* decode received edges */ + expand_sample_data(sdi, transfer->buffer, transfer->actual_length); + + if (devc->limit_samples && + (uint64_t)devc->sent_samples >= devc->limit_samples) { + devc->sent_samples = -2; + free_transfer(transfer); + return; + } +resubmit: + if (libusb_submit_transfer(transfer) != LIBUSB_SUCCESS) + free_transfer(transfer); +} diff --git a/src/hardware/chromium-twinkie/protocol.h b/src/hardware/chromium-twinkie/protocol.h new file mode 100644 index 00000000..8ed6987b --- /dev/null +++ b/src/hardware/chromium-twinkie/protocol.h @@ -0,0 +1,59 @@ +/* + * This file is part of the libsigrok project. + * + * Copyright 2014 Google, Inc + * + * 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 2 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_CHROMIUM_TWINKIE_PROTOCOL_H +#define LIBSIGROK_HARDWARE_CHROMIUM_TWINKIE_PROTOCOL_H + +#include +#include +#include +#include "libsigrok-internal.h" + +#define LOG_PREFIX "twinkie" + +/** Private, per-CC logical channel context. */ +struct cc_context { + int idx; + int rollbacks; + uint8_t prev_src; + uint8_t level; +}; + +/** Private, per-device-instance driver context. */ +struct dev_context { + /** Maximum number of samples to capture, if nonzero. */ + uint64_t limit_samples; + + int64_t sent_samples; + int submitted_transfers; + uint8_t *convbuffer; + size_t convbuffer_size; + + unsigned int num_transfers; + struct libusb_transfer **transfers; + struct sr_context *ctx; + + struct cc_context cc[2]; +}; + +SR_PRIV int twinkie_start_acquisition(const struct sr_dev_inst *sdi); +SR_PRIV int twinkie_init_device(const struct sr_dev_inst *sdi); +SR_PRIV void LIBUSB_CALL twinkie_receive_transfer(struct libusb_transfer *transfer); + +#endif