libsigrok/hardware/demo/demo.c

413 lines
9.5 KiB
C

/*
* This file is part of the sigrok project.
*
* Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
* Copyright (C) 2011 Olivier Fauchon <olivier@aixmarseille.com>
*
* 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 <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sigrok.h>
#ifdef _WIN32
#include <io.h>
#include <fcntl.h>
#define pipe(fds) _pipe(fds, 4096, _O_BINARY)
#endif
#include "config.h"
#define NUM_PROBES 8
#define DEMONAME "Demo device"
/* size of chunks to send through the session bus */
#define BUFSIZE 4096
enum {
GENMODE_DEFAULT,
GENMODE_RANDOM,
GENMODE_INC,
};
GIOChannel *channels[2];
struct databag {
int pipe_fds[2];
uint8_t sample_generator;
uint8_t thread_running;
uint64_t samples_counter;
int device_index;
gpointer session_device_id;
GTimer *timer;
};
static int capabilities[] = {
SR_HWCAP_LOGIC_ANALYZER,
SR_HWCAP_PATTERN_MODE,
SR_HWCAP_LIMIT_SAMPLES,
SR_HWCAP_LIMIT_MSEC,
SR_HWCAP_CONTINUOUS,
};
static const char *patternmodes[] = {
"random",
"incremental",
NULL,
};
static uint8_t genmode_default[] = {
0x4c, 0x92, 0x92, 0x92, 0x64, 0x00, 0x00, 0x00,
0x82, 0xfe, 0xfe, 0x82, 0x00, 0x00, 0x00, 0x00,
0x7c, 0x82, 0x82, 0x92, 0x74, 0x00, 0x00, 0x00,
0xfe, 0x12, 0x12, 0x32, 0xcc, 0x00, 0x00, 0x00,
0x7c, 0x82, 0x82, 0x82, 0x7c, 0x00, 0x00, 0x00,
0xfe, 0x10, 0x28, 0x44, 0x82, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xbe, 0xbe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
};
/* List of struct sr_device_instance, maintained by opendev()/closedev(). */
static GSList *device_instances = NULL;
static uint64_t cur_samplerate = KHZ(200);
static uint64_t limit_samples = 0;
static uint64_t limit_msec = 0;
static int default_genmode = GENMODE_DEFAULT;
static GThread *my_thread;
static int thread_running;
static void hw_stop_acquisition(int device_index, gpointer session_device_id);
static int hw_init(char *deviceinfo)
{
struct sr_device_instance *sdi;
/* Avoid compiler warnings. */
deviceinfo = deviceinfo;
sdi = sr_device_instance_new(0, SR_ST_ACTIVE, DEMONAME, NULL, NULL);
if (!sdi)
return 0;
device_instances = g_slist_append(device_instances, sdi);
return 1;
}
static int hw_opendev(int device_index)
{
/* Avoid compiler warnings. */
device_index = device_index;
/* Nothing needed so far. */
return SR_OK;
}
static void hw_closedev(int device_index)
{
/* Avoid compiler warnings. */
device_index = device_index;
/* Nothing needed so far. */
}
static void hw_cleanup(void)
{
/* Nothing needed so far. */
}
static void *hw_get_device_info(int device_index, int device_info_id)
{
struct sr_device_instance *sdi;
void *info = NULL;
if (!(sdi = sr_get_device_instance(device_instances, device_index)))
return NULL;
switch (device_info_id) {
case SR_DI_INSTANCE:
info = sdi;
break;
case SR_DI_NUM_PROBES:
info = GINT_TO_POINTER(NUM_PROBES);
break;
case SR_DI_CUR_SAMPLERATE:
info = &cur_samplerate;
break;
case SR_DI_PATTERNMODES:
info = &patternmodes;
break;
}
return info;
}
static int hw_get_status(int device_index)
{
/* Avoid compiler warnings. */
device_index = device_index;
return SR_ST_ACTIVE;
}
static int *hw_get_capabilities(void)
{
return capabilities;
}
static int hw_set_configuration(int device_index, int capability, void *value)
{
int ret;
uint64_t *tmp_u64;
char *stropt;
/* Avoid compiler warnings. */
device_index = device_index;
if (capability == SR_HWCAP_PROBECONFIG) {
/* Nothing to do, but must be supported */
ret = SR_OK;
} else if (capability == SR_HWCAP_SAMPLERATE) {
tmp_u64 = value;
cur_samplerate = *tmp_u64;
ret = SR_OK;
} else if (capability == SR_HWCAP_LIMIT_SAMPLES) {
tmp_u64 = value;
limit_samples = *tmp_u64;
ret = SR_OK;
} else if (capability == SR_HWCAP_LIMIT_MSEC) {
tmp_u64 = value;
limit_msec = *tmp_u64;
ret = SR_OK;
} else if (capability == SR_HWCAP_PATTERN_MODE) {
stropt = value;
if (!strcmp(stropt, "random")) {
default_genmode = GENMODE_RANDOM;
ret = SR_OK;
} else if (!strcmp(stropt, "incremental")) {
default_genmode = GENMODE_INC;
ret = SR_OK;
} else {
ret = SR_ERR;
}
} else {
ret = SR_ERR;
}
return ret;
}
static void samples_generator(uint8_t *buf, uint64_t size, void *data)
{
static uint64_t p = 0;
struct databag *mydata = data;
uint64_t i;
memset(buf, 0, size);
switch (mydata->sample_generator) {
case GENMODE_DEFAULT:
for (i = 0; i < size; i++) {
*(buf + i) = ~(genmode_default[p] >> 1);
if (++p == 64)
p = 0;
}
break;
case GENMODE_RANDOM: /* Random */
for (i = 0; i < size; i++)
*(buf + i) = (uint8_t)(rand() & 0xff);
break;
case GENMODE_INC: /* Simple increment */
for (i = 0; i < size; i++)
*(buf + i) = i;
break;
}
}
/* Thread function */
static void thread_func(void *data)
{
struct databag *mydata = data;
uint8_t buf[BUFSIZE];
uint64_t nb_to_send = 0;
int bytes_written;
double time_cur, time_last, time_diff;
time_last = g_timer_elapsed(mydata->timer, NULL);
while (thread_running) {
/* Rate control */
time_cur = g_timer_elapsed(mydata->timer, NULL);
time_diff = time_cur - time_last;
time_last = time_cur;
nb_to_send = cur_samplerate * time_diff;
if (limit_samples)
nb_to_send = MIN(nb_to_send,
limit_samples - mydata->samples_counter);
/* Make sure we don't overflow. */
nb_to_send = MIN(nb_to_send, BUFSIZE);
if (nb_to_send) {
samples_generator(buf, nb_to_send, data);
mydata->samples_counter += nb_to_send;
g_io_channel_write_chars(channels[1], (gchar *)&buf,
nb_to_send, (gsize *)&bytes_written, NULL);
}
/* Check if we're done. */
if ((limit_msec && time_cur * 1000 > limit_msec) ||
(limit_samples && mydata->samples_counter >= limit_samples))
{
close(mydata->pipe_fds[1]);
thread_running = 0;
}
g_usleep(10);
}
}
/* Callback handling data */
static int receive_data(int fd, int revents, void *user_data)
{
struct sr_datafeed_packet packet;
char c[BUFSIZE];
gsize z;
/* Avoid compiler warnings. */
fd = fd;
revents = revents;
do {
g_io_channel_read_chars(channels[0],
(gchar *)&c, BUFSIZE, &z, NULL);
if (z > 0) {
packet.type = SR_DF_LOGIC;
packet.length = z;
packet.unitsize = 1;
packet.payload = c;
sr_session_bus(user_data, &packet);
}
} while (z > 0);
if (!thread_running && z <= 0)
{
/* Make sure we don't receive more packets */
g_io_channel_close(channels[0]);
/* Send last packet. */
packet.type = SR_DF_END;
sr_session_bus(user_data, &packet);
return FALSE;
}
return TRUE;
}
static int hw_start_acquisition(int device_index, gpointer session_device_id)
{
struct sr_datafeed_packet *packet;
struct sr_datafeed_header *header;
struct databag *mydata;
mydata = malloc(sizeof(struct databag));
if (!mydata)
return SR_ERR_MALLOC;
mydata->sample_generator = default_genmode;
mydata->session_device_id = session_device_id;
mydata->device_index = device_index;
mydata->samples_counter = 0;
if (pipe(mydata->pipe_fds))
return SR_ERR;
channels[0] = g_io_channel_unix_new(mydata->pipe_fds[0]);
channels[1] = g_io_channel_unix_new(mydata->pipe_fds[1]);
/* Set channel encoding to binary (default is UTF-8). */
g_io_channel_set_encoding(channels[0], NULL, NULL);
g_io_channel_set_encoding(channels[1], NULL, NULL);
/* Make channels to unbuffered. */
g_io_channel_set_buffered(channels[0], FALSE);
g_io_channel_set_buffered(channels[1], FALSE);
source_add(mydata->pipe_fds[0], G_IO_IN | G_IO_ERR, 40, receive_data,
session_device_id);
/* Run the demo thread. */
g_thread_init(NULL);
/* this needs to be done between g_thread_init() and g_thread_create() */
mydata->timer = g_timer_new();
thread_running = 1;
my_thread =
g_thread_create((GThreadFunc)thread_func, mydata, TRUE, NULL);
if (!my_thread)
return SR_ERR;
packet = malloc(sizeof(struct sr_datafeed_packet));
header = malloc(sizeof(struct sr_datafeed_header));
if (!packet || !header)
return SR_ERR_MALLOC;
packet->type = SR_DF_HEADER;
packet->length = sizeof(struct sr_datafeed_header);
packet->payload = (unsigned char *)header;
header->feed_version = 1;
gettimeofday(&header->starttime, NULL);
header->samplerate = cur_samplerate;
header->protocol_id = SR_PROTO_RAW;
header->num_logic_probes = NUM_PROBES;
header->num_analog_probes = 0;
sr_session_bus(session_device_id, packet);
free(header);
free(packet);
return SR_OK;
}
static void hw_stop_acquisition(int device_index, gpointer session_device_id)
{
/* Avoid compiler warnings. */
device_index = device_index;
session_device_id = session_device_id;
/* Stop generate thread. */
thread_running = 0;
}
struct sr_device_plugin demo_plugin_info = {
"demo",
"Demo driver and pattern generator",
1,
hw_init,
hw_cleanup,
hw_opendev,
hw_closedev,
hw_get_device_info,
hw_get_status,
hw_get_capabilities,
hw_set_configuration,
hw_start_acquisition,
hw_stop_acquisition,
};