Adding information on how to use gnuplot to plot the results downloaded from the
PCE.
/*
PCE-HT71 programmer and data downloader for libusb
Copyright (C) 2010 LluĂs Batlle i Rossell
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 <http://www.gnu.org/licenses/>.
*/
#include <usb.h>
#include <stdio.h>
#include <assert.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <time.h>
const int vendor=0x10c4;
const int product=0x0003;
usb_dev_handle *handle;
struct usb_device *device;
int ep_in = 1;
int ep_out = 2;
enum
{
HELP,
SET,
DOWNLOAD
} action;
struct
{
int nsamples;
int time_per_sample;
int immediate;
char *download_file;
} config;
FILE *outfile;
int connect()
{
struct usb_bus *bus;
bus = usb_get_busses();
while (bus != 0)
{
struct usb_device *dev;
dev = bus->devices;
while(dev != 0)
{
if (dev->descriptor.idVendor == vendor
&& dev->descriptor.idProduct == product)
{
handle = usb_open(dev);
device = dev;
return 0;
}
dev = dev->next;
}
bus = bus->next;
}
handle = 0;
return -1;
}
int send_program()
{
int res;
res = usb_bulk_write(handle, ep_out, "\x01\x40\x00", 3, 1000);
assert(res == 3);
}
int send_config()
{
int res;
char buf[64];
struct tm *t;
time_t tmp_time;
tmp_time = time(NULL);
t = localtime(&tmp_time);
buf[0] = '\xce';
buf[1] = 0;
buf[2] = 0;
buf[3] = 0;
// Samples
*( (int *) &buf[4]) = config.nsamples;
// Samples got
*( (int *) &buf[8]) = 0;
// Sample rate
*( (int *) &buf[12]) = config.time_per_sample;
// Year
*( (int *) &buf[16]) = t->tm_year + 1900;
// Mintemp
buf[20] = 0;
buf[21] = 0;
*( (short int *) &buf[22]) = 0x4120;
// Maxtemp
buf[24] = 0;
buf[25] = 0;
*( (short int *) &buf[26]) = 0x41a0;
// Month
buf[28] = t->tm_mon;
// Day
buf[29] = t->tm_mday;
// hour
buf[30] = t->tm_hour;
// Minute
buf[31] = t->tm_min;
// second
buf[32] = t->tm_sec;
// Celsius (1 F)
buf[33] = 0;
// Pause between leds (300s)
buf[34] = 0x1e;
// Name
buf[35] = 'A';
buf[36] = '0';
// Immediate
buf[51] = config.immediate ? 2 : 1;
// Minhum
buf[52] = 0;
buf[53] = 0;
*( (short int *) &buf[54]) = 0x410f;
// Maxhum
buf[56] = 0;
buf[57] = 0;
*( (short int *) &buf[58]) = 0x4296;
// final
buf[60] = 0xce;
buf[61] = 0x0;
buf[62] = 0x0;
buf[63] = 0x0;
res = usb_bulk_write(handle, ep_out, buf, 64, 1000);
assert(res == 64);
res = usb_bulk_read(handle, ep_in, buf, 1, 1000);
assert(res == 1);
}
void parse_data(char *data)
{
fprintf(outfile, "# Start: %hi-%hhi-%hhi %hhi:%hhi:%hhi\n",
*((short int *) (data + 16)),
*((unsigned char *) (data + 28))+1,
*((unsigned char *) (data + 29)),
*((unsigned char *) (data + 30)),
*((unsigned char *) (data + 31)),
*((unsigned char *) (data + 32)));
fprintf(outfile, "# Num Samples: %hi\n",
*((short int *) (data + 8))
);
fprintf(outfile, "# Time between samples: %hi s\n",
*((short int *) (data + 12))
);
}
int
start_download()
{
int res;
res = usb_bulk_write(handle, ep_out, "\x00\x10\x01", 3, 1000);
assert(res == 3);
char data[100];
res = usb_bulk_read(handle, ep_in, data, 3, 1000);
assert(res == 3);
fprintf(stderr, "Debug: %02hhx%02hhx%02hhx\n", data[0], data[1], data[2]);
assert(data[0] == 2);
int num = *((short int*) &data[1]);
fprintf(stderr, "Found %i bytes = %i samples\n", num, num/4);
if (num > 0)
{
int num_frames = (num + 63) / 64;
fprintf(stderr, "%i frames\n", num_frames);
/*
res = usb_bulk_write(handle, ep_out, "\x00\x00\x01", 3, 1000);
assert(res == 3);
*/
res = usb_bulk_read(handle, ep_in, data, 64, 1000);
assert(res == 64);
parse_data(data);
int sec = 0;
int block = 0;
do
{
char frame[3];
int step_frames = num_frames >= 0x40 ? 0x40 : num_frames;
frame[0] = 0;
frame[1] = block;
frame[2] = step_frames;
res = usb_bulk_write(handle, ep_out, frame, 3, 1000);
assert(res == 3);
res = usb_bulk_read(handle, ep_in, data, 3, 1000);
assert(res == 3);
fprintf(stderr, "Debug: %02hhx%02hhx%02hhx\n", data[0], data[1], data[2]);
assert(data[0] == 2);
int i;
for(i=0; i < step_frames; ++i)
{
res = usb_bulk_read(handle, ep_in, data, 64, 5000);
assert(res == 64);
int take = (num >= 64) ? 64 : num;
int j;
for(j=0; j<take; j+=4)
{
float temp = *((short int *) (data + j)) / 10.;
float hum = *((short int *) (data + j + 2)) / 10.;
fprintf(outfile, "%i %g %g\n", sec, temp, hum);
sec++;
}
num -= 64;
num_frames -= 1;
}
++block;
}
while(num_frames > 0);
}
}
void
usage()
{
fprintf(stderr, "pce v0.2 - PCE-HT71 programmer and data downloader\n");
fprintf(stderr, "Copyright (C) 2010 Lluis Batlle i Rossell\n");
fprintf(stderr, "This program comes with ABSOLUTELY NO WARRANTY.\n");
fprintf(stderr, "This is free software, and you are welcome to redistribute it\n");
fprintf(stderr, "under certain conditions; type `show c' for details.\n");
fprintf(stderr, "\nusage: pce [-n maxsamples] [-t timepersample] [-i] <-d downloadfile | -s>\n");
}
int main(int argc, char **argv)
{
int res;
int opt;
config.nsamples = 16000;
config.immediate = 0;
config.time_per_sample = 2;
config.download_file = 0;
action = HELP;
while ((opt = getopt(argc, argv, "n:d:t:si")) != -1) {
switch (opt) {
case 'n':
config.nsamples = atoi(optarg);
break;
case 't':
config.time_per_sample = atoi(optarg);
break;
case 'd':
config.download_file = optarg;
action = DOWNLOAD;
break;
case 's':
action = SET;
break;
case 'i':
config.immediate = 1;
break;
default:
usage();
return 1;
}
}
if (action == HELP)
{
usage();
return 0;
}
usb_init();
usb_find_busses();
usb_find_devices();
connect();
if (handle == 0)
{
fprintf(stderr, "Cannot find the PCE-HT71\n");
return -1;
}
res = usb_claim_interface(handle,
device->config->interface->altsetting->bInterfaceNumber);
assert(res == 0 && "claim_interface");
if (action == SET)
{
fprintf(stderr, "Settings: \n");
fprintf(stderr, " Max samples: %i\n", config.nsamples);
fprintf(stderr, " Time between samples: %i\n", config.time_per_sample);
fprintf(stderr, " Mode: %s\n", config.immediate ? "immediate" : "manual");
send_program();
send_config();
}
else
{
outfile = fopen(config.download_file, "w");
if (outfile != NULL)
{
start_download();
fprintf(stderr, "File \"%s\" written\n", config.download_file);
fclose(outfile);
}
else
{
fprintf(stderr, "Error opening file: %s", strerror(errno));
}
}
res = usb_release_interface(handle,
device->config->interface->altsetting->bInterfaceNumber);
assert(res == 0 && "release_interface");
usb_close(handle);
handle = 0;
return 0;
}