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change demo.c to output analog packets 

You need to #define DEMO_ANALOG to generate DF_ANALOG packets.
This commit is contained in:
Daniel Ribeiro 2011-01-21 01:30:56 -02:00
parent 6eb0e3ea95
commit 764f887f7b
1 changed files with 102 additions and 4 deletions
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106
hardware/demo/demo.c
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@ -19,6 +19,8 @@
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
//#define DEMO_ANALOG
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
@ -30,10 +32,18 @@
#endif
#include "config.h"
#ifdef DEMO_ANALOG
#define NUM_PROBES 9
#else
#define NUM_PROBES 8
#endif
#define DEMONAME "Demo device"
/* size of chunks to send through the session bus */
#ifdef DEMO_ANALOG
#define BUFSIZE 32768
#else
#define BUFSIZE 4096
#endif
enum {
GENMODE_DEFAULT,
@ -67,6 +77,7 @@ static const char *patternmodes[] = {
NULL,
};
#ifndef DEMO_ANALOG
static uint8_t genmode_default[] = {
0x4c, 0x92, 0x92, 0x92, 0x64, 0x00, 0x00, 0x00,
0x82, 0xfe, 0xfe, 0x82, 0x00, 0x00, 0x00, 0x00,
@ -77,6 +88,7 @@ static uint8_t genmode_default[] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xbe, 0xbe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
};
#endif
/* List of struct sigrok_device_instance, maintained by opendev()/closedev(). */
static GSList *device_instances = NULL;
@ -208,6 +220,35 @@ static void samples_generator(uint8_t *buf, uint64_t size, void *data)
{
struct databag *mydata = data;
uint64_t p, i;
#ifdef DEMO_ANALOG
/*
* We will simulate a device with 8 logic probes and 1 analog probe.
* This fictional device sends the data packed: 8 bits for 8 logic
* probes and 16 bits for the analog probe, in this order.
* Total of 24 bits.
* I could just generate a properly formatted DF_ANALOG packet here,
* but I will leave the formatting to receive_data() to make its code
* more like a real hardware driver.
*/
memset(buf, 0, size * 3);
switch (mydata->sample_generator) {
default:
case GENMODE_DEFAULT:
case GENMODE_RANDOM:
for (i = 0; i < size * 3; i += 3) {
*(buf + i) = (uint8_t)(rand() & 0xff);
*(uint16_t *) (buf + i + 1) = (uint16_t)(rand() & 0xffff);
}
break;
case GENMODE_INC:
for (i = 0; i < size * 3; i += 3) {
*(buf + i) = i / 3;
*(uint16_t *)(buf + i + 1) = i / 3 * 256 * 10;
}
break;
}
#else
memset(buf, 0, size);
@ -229,6 +270,7 @@ static void samples_generator(uint8_t *buf, uint64_t size, void *data)
*(buf + i) = i;
break;
}
#endif
}
/* Thread function */
@ -257,14 +299,22 @@ static void thread_func(void *data)
limit_samples - mydata->samples_counter);
/* Make sure we don't overflow. */
#ifdef DEMO_ANALOG
nb_to_send = MIN(nb_to_send, BUFSIZE / 3);
#else
nb_to_send = MIN(nb_to_send, BUFSIZE);
#endif
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);
#ifdef DEMO_ANALOG
g_io_channel_write_chars(channels[1], (gchar *) &buf,
nb_to_send * 3, (gsize *) &bytes_written, NULL);
#else
g_io_channel_write_chars(channels[1], (gchar *) &buf,
nb_to_send, (gsize *) &bytes_written, NULL);
#endif
}
/* Check if we're done. */
@ -285,6 +335,13 @@ static int receive_data(int fd, int revents, void *user_data)
struct datafeed_packet packet;
char c[BUFSIZE];
uint64_t z;
#ifdef DEMO_ANALOG
struct analog_sample *sample;
unsigned int i, x;
int sample_size = sizeof(struct analog_sample) +
(NUM_PROBES * sizeof(struct analog_probe));
char *buf;
#endif
/* Avoid compiler warnings. */
fd = fd;
@ -292,14 +349,51 @@ static int receive_data(int fd, int revents, void *user_data)
do {
g_io_channel_read_chars(channels[0],
(gchar *)&c, BUFSIZE, &z, NULL);
(gchar *) &c, BUFSIZE, (gsize *) &z, NULL);
if (z > 0) {
#ifdef DEMO_ANALOG
packet.type = DF_ANALOG;
packet.length = (z / 3) * sample_size;
packet.unitsize = sample_size;
buf = malloc(sample_size * packet.length);
if (!buf)
return FALSE;
/* Craft our packet. */
for (i = 0; i < z / 3; i++) {
sample = (struct analog_sample *) (buf + (i * sample_size));
sample->num_probes = NUM_PROBES;
/* 8 Logic probes */
for (x = 0; x < NUM_PROBES - 1; x++) {
sample->probes[x].val =
(c[i * 3] >> x) & 1;
sample->probes[x].res = 1;
}
/* 1 Analog probe, 16 bit adc */
for (; x < NUM_PROBES; x++) {
sample->probes[x].val =
*(uint16_t *) (c + i * 3 + 1);
sample->probes[x].val &= ((1 << 16) - 1);
sample->probes[x].res = 16;
}
}
packet.payload = buf;
session_bus(user_data, &packet);
free(buf);
#else
packet.type = DF_LOGIC;
packet.length = z;
packet.unitsize = 1;
packet.payload = c;
session_bus(user_data, &packet);
#endif
}
} while (z > 0);
@ -367,6 +461,10 @@ static int hw_start_acquisition(int device_index, gpointer session_device_id)
packet->type = DF_HEADER;
packet->length = sizeof(struct datafeed_header);
packet->payload = (unsigned char *)header;
#ifdef DEMO_ANALOG
packet->unitsize = sizeof(struct analog_sample) +
(NUM_PROBES * sizeof(struct analog_probe));
#endif
header->feed_version = 1;
gettimeofday(&header->starttime, NULL);
header->samplerate = cur_samplerate;