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libsigrok/hardware/chronovu-la8/api.c

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/*
* This file is part of the libsigrok project.
*
* Copyright (C) 2011-2012 Uwe Hermann <uwe@hermann-uwe.de>
*
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <ftdi.h>
#include <glib.h>
#include <string.h>
#include "libsigrok.h"
#include "libsigrok-internal.h"
#include "protocol.h"
SR_PRIV struct sr_dev_driver chronovu_la8_driver_info;
static struct sr_dev_driver *di = &chronovu_la8_driver_info;
/*
* This will be initialized via config_list()/SR_CONF_SAMPLERATE.
*
* Min: 1 sample per 0.01us -> sample time is 0.084s, samplerate 100MHz
* Max: 1 sample per 2.55us -> sample time is 21.391s, samplerate 392.15kHz
*/
SR_PRIV uint64_t chronovu_la8_samplerates[255] = { 0 };
/* Note: Continuous sampling is not supported by the hardware. */
SR_PRIV const int32_t chronovu_la8_hwcaps[] = {
SR_CONF_LOGIC_ANALYZER,
SR_CONF_SAMPLERATE,
SR_CONF_LIMIT_MSEC, /* TODO: Not yet implemented. */
SR_CONF_LIMIT_SAMPLES, /* TODO: Not yet implemented. */
};
/*
* The ChronoVu LA8 can have multiple PIDs. Older versions shipped with
* a standard FTDI USB VID/PID of 0403:6001, newer ones have 0403:8867.
*/
static const uint16_t usb_pids[] = {
0x6001,
0x8867,
};
/* Function prototypes. */
static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data);
static void clear_helper(void *priv)
{
struct dev_context *devc;
devc = priv;
ftdi_free(devc->ftdic);
g_free(devc->final_buf);
}
static int dev_clear(void)
{
return std_dev_clear(di, clear_helper);
}
static int init(struct sr_context *sr_ctx)
{
return std_init(sr_ctx, di, LOG_PREFIX);
}
static GSList *scan(GSList *options)
{
struct sr_dev_inst *sdi;
struct sr_probe *probe;
struct drv_context *drvc;
struct dev_context *devc;
GSList *devices;
unsigned int i;
int ret;
(void)options;
drvc = di->priv;
devices = NULL;
/* Allocate memory for our private device context. */
if (!(devc = g_try_malloc(sizeof(struct dev_context)))) {
sr_err("Device context malloc failed.");
goto err_free_nothing;
}
/* Set some sane defaults. */
devc->ftdic = NULL;
devc->cur_samplerate = SR_MHZ(100); /* 100MHz == max. samplerate */
devc->limit_msec = 0;
devc->limit_samples = 0;
devc->cb_data = NULL;
memset(devc->mangled_buf, 0, BS);
devc->final_buf = NULL;
devc->trigger_pattern = 0x00; /* Value irrelevant, see trigger_mask. */
devc->trigger_mask = 0x00; /* All probes are "don't care". */
devc->trigger_timeout = 10; /* Default to 10s trigger timeout. */
devc->trigger_found = 0;
devc->done = 0;
devc->block_counter = 0;
devc->divcount = 0; /* 10ns sample period == 100MHz samplerate */
devc->usb_pid = 0;
/* Allocate memory where we'll store the de-mangled data. */
if (!(devc->final_buf = g_try_malloc(SDRAM_SIZE))) {
sr_err("final_buf malloc failed.");
goto err_free_devc;
}
/* Allocate memory for the FTDI context (ftdic) and initialize it. */
if (!(devc->ftdic = ftdi_new())) {
sr_err("%s: ftdi_new failed.", __func__);
goto err_free_final_buf;
}
/* Check for the device and temporarily open it. */
for (i = 0; i < ARRAY_SIZE(usb_pids); i++) {
sr_dbg("Probing for VID/PID %04x:%04x.", USB_VENDOR_ID,
usb_pids[i]);
ret = ftdi_usb_open_desc(devc->ftdic, USB_VENDOR_ID,
usb_pids[i], USB_DESCRIPTION, NULL);
if (ret == 0) {
sr_dbg("Found LA8 device (%04x:%04x).",
USB_VENDOR_ID, usb_pids[i]);
devc->usb_pid = usb_pids[i];
}
}
if (devc->usb_pid == 0)
goto err_free_ftdic;
/* Register the device with libsigrok. */
sdi = sr_dev_inst_new(0, SR_ST_INITIALIZING,
USB_VENDOR_NAME, USB_MODEL_NAME, USB_MODEL_VERSION);
if (!sdi) {
sr_err("%s: sr_dev_inst_new failed.", __func__);
goto err_close_ftdic;
}
sdi->driver = di;
sdi->priv = devc;
for (i = 0; chronovu_la8_probe_names[i]; i++) {
if (!(probe = sr_probe_new(i, SR_PROBE_LOGIC, TRUE,
chronovu_la8_probe_names[i])))
return NULL;
sdi->probes = g_slist_append(sdi->probes, probe);
}
devices = g_slist_append(devices, sdi);
drvc->instances = g_slist_append(drvc->instances, sdi);
/* Close device. We'll reopen it again when we need it. */
(void) la8_close(devc); /* Log, but ignore errors. */
return devices;
err_close_ftdic:
(void) la8_close(devc); /* Log, but ignore errors. */
err_free_ftdic:
ftdi_free(devc->ftdic); /* NOT free() or g_free()! */
err_free_final_buf:
g_free(devc->final_buf);
err_free_devc:
g_free(devc);
err_free_nothing:
return NULL;
}
static GSList *dev_list(void)
{
return ((struct drv_context *)(di->priv))->instances;
}
static int dev_open(struct sr_dev_inst *sdi)
{
struct dev_context *devc;
int ret;
if (!(devc = sdi->priv)) {
sr_err("%s: sdi->priv was NULL.", __func__);
return SR_ERR_BUG;
}
sr_dbg("Opening LA8 device (%04x:%04x).", USB_VENDOR_ID,
devc->usb_pid);
/* Open the device. */
if ((ret = ftdi_usb_open_desc(devc->ftdic, USB_VENDOR_ID,
devc->usb_pid, USB_DESCRIPTION, NULL)) < 0) {
sr_err("%s: ftdi_usb_open_desc: (%d) %s",
__func__, ret, ftdi_get_error_string(devc->ftdic));
(void) la8_close_usb_reset_sequencer(devc); /* Ignore errors. */
return SR_ERR;
}
sr_dbg("Device opened successfully.");
/* Purge RX/TX buffers in the FTDI chip. */
if ((ret = ftdi_usb_purge_buffers(devc->ftdic)) < 0) {
sr_err("%s: ftdi_usb_purge_buffers: (%d) %s",
__func__, ret, ftdi_get_error_string(devc->ftdic));
(void) la8_close_usb_reset_sequencer(devc); /* Ignore errors. */
goto err_dev_open_close_ftdic;
}
sr_dbg("FTDI buffers purged successfully.");
/* Enable flow control in the FTDI chip. */
if ((ret = ftdi_setflowctrl(devc->ftdic, SIO_RTS_CTS_HS)) < 0) {
sr_err("%s: ftdi_setflowcontrol: (%d) %s",
__func__, ret, ftdi_get_error_string(devc->ftdic));
(void) la8_close_usb_reset_sequencer(devc); /* Ignore errors. */
goto err_dev_open_close_ftdic;
}
sr_dbg("FTDI flow control enabled successfully.");
/* Wait 100ms. */
g_usleep(100 * 1000);
sdi->status = SR_ST_ACTIVE;
return SR_OK;
err_dev_open_close_ftdic:
(void) la8_close(devc); /* Log, but ignore errors. */
return SR_ERR;
}
static int dev_close(struct sr_dev_inst *sdi)
{
struct dev_context *devc;
devc = sdi->priv;
if (sdi->status == SR_ST_ACTIVE) {
sr_dbg("Status ACTIVE, closing device.");
(void) la8_close_usb_reset_sequencer(devc); /* Ignore errors. */
} else {
sr_spew("Status not ACTIVE, nothing to do.");
}
sdi->status = SR_ST_INACTIVE;
return SR_OK;
}
static int cleanup(void)
{
return dev_clear();
}
static int config_get(int id, GVariant **data, const struct sr_dev_inst *sdi)
{
struct dev_context *devc;
switch (id) {
case SR_CONF_SAMPLERATE:
if (sdi) {
devc = sdi->priv;
*data = g_variant_new_uint64(devc->cur_samplerate);
sr_spew("%s: Returning samplerate: %" PRIu64 "Hz.",
__func__, devc->cur_samplerate);
} else
return SR_ERR;
break;
default:
return SR_ERR_NA;
}
return SR_OK;
}
static int config_set(int id, GVariant *data, const struct sr_dev_inst *sdi)
{
struct dev_context *devc;
if (sdi->status != SR_ST_ACTIVE)
return SR_ERR_DEV_CLOSED;
if (!(devc = sdi->priv)) {
sr_err("%s: sdi->priv was NULL.", __func__);
return SR_ERR_BUG;
}
switch (id) {
case SR_CONF_SAMPLERATE:
if (set_samplerate(sdi, g_variant_get_uint64(data)) == SR_ERR) {
sr_err("%s: setting samplerate failed.", __func__);
return SR_ERR;
}
sr_dbg("SAMPLERATE = %" PRIu64, devc->cur_samplerate);
break;
case SR_CONF_LIMIT_MSEC:
if (g_variant_get_uint64(data) == 0) {
sr_err("%s: LIMIT_MSEC can't be 0.", __func__);
return SR_ERR;
}
devc->limit_msec = g_variant_get_uint64(data);
sr_dbg("LIMIT_MSEC = %" PRIu64, devc->limit_msec);
break;
case SR_CONF_LIMIT_SAMPLES:
if (g_variant_get_uint64(data) < MIN_NUM_SAMPLES) {
sr_err("%s: LIMIT_SAMPLES too small.", __func__);
return SR_ERR;
}
devc->limit_samples = g_variant_get_uint64(data);
sr_dbg("LIMIT_SAMPLES = %" PRIu64, devc->limit_samples);
break;
default:
return SR_ERR_NA;
}
return SR_OK;
}
static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi)
{
GVariant *gvar;
GVariantBuilder gvb;
(void)sdi;
switch (key) {
case SR_CONF_DEVICE_OPTIONS:
*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
chronovu_la8_hwcaps,
ARRAY_SIZE(chronovu_la8_hwcaps),
sizeof(int32_t));
break;
case SR_CONF_SAMPLERATE:
fill_supported_samplerates_if_needed();
g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
chronovu_la8_samplerates,
ARRAY_SIZE(chronovu_la8_samplerates),
sizeof(uint64_t));
g_variant_builder_add(&gvb, "{sv}", "samplerates", gvar);
*data = g_variant_builder_end(&gvb);
break;
case SR_CONF_TRIGGER_TYPE:
*data = g_variant_new_string(TRIGGER_TYPE);
break;
default:
return SR_ERR_NA;
}
return SR_OK;
}
static int receive_data(int fd, int revents, void *cb_data)
{
int i, ret;
struct sr_dev_inst *sdi;
struct dev_context *devc;
(void)fd;
(void)revents;
if (!(sdi = cb_data)) {
sr_err("%s: cb_data was NULL.", __func__);
return FALSE;
}
if (!(devc = sdi->priv)) {
sr_err("%s: sdi->priv was NULL.", __func__);
return FALSE;
}
if (!devc->ftdic) {
sr_err("%s: devc->ftdic was NULL.", __func__);
return FALSE;
}
/* Get one block of data. */
if ((ret = la8_read_block(devc)) < 0) {
sr_err("%s: la8_read_block error: %d.", __func__, ret);
dev_acquisition_stop(sdi, sdi);
return FALSE;
}
/* We need to get exactly NUM_BLOCKS blocks (i.e. 8MB) of data. */
if (devc->block_counter != (NUM_BLOCKS - 1)) {
devc->block_counter++;
return TRUE;
}
sr_dbg("Sampling finished, sending data to session bus now.");
/* All data was received and demangled, send it to the session bus. */
for (i = 0; i < NUM_BLOCKS; i++)
send_block_to_session_bus(devc, i);
dev_acquisition_stop(sdi, sdi);
return TRUE;
}
static int dev_acquisition_start(const struct sr_dev_inst *sdi, void *cb_data)
{
struct dev_context *devc;
uint8_t buf[4];
int bytes_written;
if (sdi->status != SR_ST_ACTIVE)
return SR_ERR_DEV_CLOSED;
if (!(devc = sdi->priv)) {
sr_err("%s: sdi->priv was NULL.", __func__);
return SR_ERR_BUG;
}
if (!devc->ftdic) {
sr_err("%s: devc->ftdic was NULL.", __func__);
return SR_ERR_BUG;
}
devc->divcount = samplerate_to_divcount(devc->cur_samplerate);
if (devc->divcount == 0xff) {
sr_err("%s: Invalid divcount/samplerate.", __func__);
return SR_ERR;
}
if (configure_probes(sdi) != SR_OK) {
sr_err("Failed to configure probes.");
return SR_ERR;
}
/* Fill acquisition parameters into buf[]. */
buf[0] = devc->divcount;
buf[1] = 0xff; /* This byte must always be 0xff. */
buf[2] = devc->trigger_pattern;
buf[3] = devc->trigger_mask;
/* Start acquisition. */
bytes_written = la8_write(devc, buf, 4);
if (bytes_written < 0) {
sr_err("Acquisition failed to start: %d.", bytes_written);
return SR_ERR;
} else if (bytes_written != 4) {
sr_err("Acquisition failed to start: %d.", bytes_written);
return SR_ERR;
}
sr_dbg("Hardware acquisition started successfully.");
devc->cb_data = cb_data;
/* Send header packet to the session bus. */
std_session_send_df_header(cb_data, LOG_PREFIX);
/* Time when we should be done (for detecting trigger timeouts). */
devc->done = (devc->divcount + 1) * 0.08388608 + time(NULL)
+ devc->trigger_timeout;
devc->block_counter = 0;
devc->trigger_found = 0;
/* Hook up a dummy handler to receive data from the LA8. */
sr_source_add(-1, G_IO_IN, 0, receive_data, (void *)sdi);
return SR_OK;
}
static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
{
struct sr_datafeed_packet packet;
(void)sdi;
sr_dbg("Stopping acquisition.");
sr_source_remove(-1);
/* Send end packet to the session bus. */
sr_dbg("Sending SR_DF_END.");
packet.type = SR_DF_END;
sr_session_send(cb_data, &packet);
return SR_OK;
}
SR_PRIV struct sr_dev_driver chronovu_la8_driver_info = {
.name = "chronovu-la8",
.longname = "ChronoVu LA8",
.api_version = 1,
.init = init,
.cleanup = cleanup,
.scan = scan,
.dev_list = 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,
.priv = NULL,
};
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