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pcsensor2.c
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pcsensor2.c
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#include <stdio.h>
#include <unistd.h>
#include <ctype.h>
#include <libusb-1.0/libusb.h>
#include <errno.h>
#include <stdint.h>
#include <stdlib.h>
#define VERSION "1.0"
#define USB_VID 0x0c45
#define USB_PID 0x7401
#define USBTIMEOUTINMS 1000
static struct libusb_device_handle *usbdevh = NULL;
static int debug = 1;
static void printversion(void) {
printf("pcsensor2 v" VERSION "\n");
}
static void printusage(void) {
printversion();
printf("usage: -h - this help\n");
printf(" -v - print version\n");
printf(" -q - silent operation\n");
printf(" -b [bus] - set usb bus to search for sensors\n");
printf(" -d [dev] - set usb device address to search for sensors,\n");
printf(" needs bus given with -b\n");
}
static int init_control_transfer(void) {
int r;
uint8_t question1[] = { 0x01, 0x01 };
r = libusb_control_transfer(usbdevh, 0x21, 0x09, 0x0201, 0x00, question1, sizeof(question1), USBTIMEOUTINMS);
if (r < 0) {
fprintf(stderr, "error: init control transfer error\n");
return -1;
}
return 0;
}
static int control_transfer(uint8_t *question, int questionsize) {
int r;
r = libusb_control_transfer(usbdevh, 0x21, 0x09, 0x0200, 0x01, question, questionsize, USBTIMEOUTINMS);
if (r < 0) {
fprintf(stderr, "error: control transfer error\n");
return -1;
}
return 0;
}
static int interrupt_read(uint8_t *response, int responsesize) {
int r, transferred;
r = libusb_interrupt_transfer(usbdevh, 0x82, response, responsesize, &transferred, USBTIMEOUTINMS);
if (r < 0 || transferred != responsesize) {
fprintf(stderr, "error: failed to read interrupt response\n");
return -1;
}
return 0;
}
static int readtemp(float *temp) {
int r;
uint8_t question1[] = { 0x01, 0x80, 0x33, 0x01, 0x00, 0x00, 0x00, 0x00 };
uint8_t question2[] = { 0x01, 0x82, 0x77, 0x01, 0x00, 0x00, 0x00, 0x00 };
uint8_t question3[] = { 0x01, 0x86, 0xff, 0x01, 0x00, 0x00, 0x00, 0x00 };
uint8_t response[8];
if (debug)
printf("sending init control transfer\n");
r = init_control_transfer();
if (r < 0)
return r;
if (debug)
printf("sending control transfer question1\n");
r = control_transfer(question1, sizeof(question1));
if (r < 0)
return r;
if (debug)
printf("reading interrupt response\n");
r = interrupt_read(response, sizeof(response));
if (r < 0)
return r;
if (debug)
printf("sending control transfer question2\n");
r = control_transfer(question2, sizeof(question2));
if (r < 0)
return r;
if (debug)
printf("reading interrupt response\n");
r = interrupt_read(response, sizeof(response));
if (r < 0)
return r;
if (debug)
printf("sending control transfer question3\n");
r = control_transfer(question3, sizeof(question3));
if (r < 0)
return r;
if (debug)
printf("reading interrupt response\n");
r = interrupt_read(response, sizeof(response));
if (r < 0)
return r;
if (debug)
printf("reading interrupt response\n");
r = interrupt_read(response, sizeof(response));
if (r < 0)
return r;
if (debug)
printf("sending control transfer question1\n");
r = control_transfer(question1, sizeof(question1));
if (r < 0)
return r;
if (debug)
printf("reading temperature interrupt response\n");
r = interrupt_read(response, sizeof(response));
if (r < 0)
return r;
*temp = (response[3] & 0xFF) + (response[2] << 8);
*temp = *temp * (125.0 / 32000.0);
return 0;
}
int main(int argc, char **argv) {
int r, i, usbdevcount;
char *endptr;
int cmdline_bus = -1, cmdline_dev = -1;
libusb_device **usbdevlist = NULL;
struct libusb_device_descriptor desc;
libusb_device *probe_usbdev = NULL;
float temp;
while ((r = getopt(argc, argv, "vb:d:qh")) != -1) {
switch (r) {
case 'v':
printversion();
break;
case 'b':
errno = 0;
cmdline_bus = strtol(optarg, &endptr, 10);
if (*endptr != 0 || errno != 0) {
fprintf(stderr, "invalid bus number\n");
return 1;
}
break;
case 'd':
errno = 0;
cmdline_dev = strtol(optarg, &endptr, 10);
if (*endptr != 0 || errno != 0) {
fprintf(stderr, "invalid device address\n");
return 1;
}
break;
case 'q':
debug = 0;
break;
case 'h':
printusage();
return 0;
break;
default:
if (isprint(optopt))
fprintf(stderr, "unknown option '-%c'.\n", optopt);
else
fprintf(stderr, "unknown option character '-%x'.\n", optopt);
return 1;
}
}
if (optind < argc || (cmdline_dev && !cmdline_bus)) {
printusage();
return 1;
}
r = libusb_init(NULL);
if (r < 0) {
fprintf(stderr, "error: libusb init error\n");
return 1;
}
libusb_set_debug(NULL, 3);
if (debug)
printf("opening device vid=%.4x pid=%.4x...\n", USB_VID, USB_PID);
usbdevcount = libusb_get_device_list(NULL, &usbdevlist);
for (i = 0; i < usbdevcount; i++) {
probe_usbdev = usbdevlist[i];
r = libusb_get_device_descriptor(probe_usbdev, &desc);
if (r >= 0 && desc.idVendor == USB_VID && desc.idProduct == USB_PID) {
if (cmdline_bus >= 0 && libusb_get_bus_number(probe_usbdev) != cmdline_bus)
continue;
if (cmdline_dev >= 0 && libusb_get_device_address(probe_usbdev) != cmdline_dev)
continue;
r = libusb_open(probe_usbdev, &usbdevh);
if (r >= 0 && debug)
printf("device opened\n");
break;
}
}
if (usbdevlist)
libusb_free_device_list(usbdevlist, 1);
if (!usbdevh) {
fprintf(stderr, "error: can't find device\n");
libusb_exit(NULL);
return 1;
}
if (libusb_kernel_driver_active(usbdevh, 0))
libusb_detach_kernel_driver(usbdevh, 0);
if (libusb_kernel_driver_active(usbdevh, 1))
libusb_detach_kernel_driver(usbdevh, 1);
r = libusb_set_configuration(usbdevh, 1);
if (r < 0) {
fprintf(stderr, "error: can't set usb configuration\n");
return 1;
}
r = libusb_claim_interface(usbdevh, 0);
if (r < 0) {
fprintf(stderr, "error: can't claim interface 0\n");
libusb_close(usbdevh);
libusb_exit(NULL);
return 1;
}
r = libusb_claim_interface(usbdevh, 1);
if (r < 0) {
fprintf(stderr, "error: can't claim interface 1\n");
libusb_release_interface(usbdevh, 0);
libusb_close(usbdevh);
libusb_exit(NULL);
return 1;
}
if (debug)
printf("device claimed\n");
r = readtemp(&temp);
if (r >= 0) {
if (debug)
printf("temperature: %f°C\n", temp);
else
printf("%f\n", temp);
}
libusb_release_interface(usbdevh, 0);
libusb_release_interface(usbdevh, 1);
libusb_close(usbdevh);
libusb_exit(NULL);
return 0;
}