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pcsensor.c
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pcsensor.c
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#include <usb.h>
#include <stdio.h>
#include <time.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <signal.h>
#define VENDOR_ID 0x0c45
#define PRODUCT_ID 0x7401
#define INTERFACE1 0x00
#define INTERFACE2 0x01
const static int reqIntLen=8;
const static int endpoint_Int_in=0x82; /* endpoint 0x81 address for IN */
const static int endpoint_Int_out=0x00; /* endpoint 1 address for OUT */
const static int timeout=5000; /* timeout in ms */
const static char uTemp[] = { 0x01, 0x80, 0x33, 0x01, 0x00, 0x00, 0x00, 0x00 };
const static char uIni1[] = { 0x01, 0x82, 0x77, 0x01, 0x00, 0x00, 0x00, 0x00 };
const static char uIni2[] = { 0x01, 0x86, 0xff, 0x01, 0x00, 0x00, 0x00, 0x00 };
/* Offset of temperature in read buffer; varies by product */
static size_t tempOffset;
static int bsalir=1;
static int debug=0;
static int seconds=5;
/* Even within the same VENDOR_ID / PRODUCT_ID, there are hardware variations
* which we can detect by reading the USB product ID string. This determines
* where the temperature offset is stored in the USB read buffer. */
const static struct product_hw {
size_t offset;
const char *id_string;
} product_ids[] = {
{ 4, "TEMPer1F_V1.3" },
{ 2, 0 } /* default offset is 2 */
};
void bad(const char *why) {
fprintf(stderr,"Fatal error> %s\n",why);
exit(17);
}
usb_dev_handle *find_lvr_winusb();
void usb_detach(usb_dev_handle *lvr_winusb, int iInterface) {
int ret;
ret = usb_detach_kernel_driver_np(lvr_winusb, iInterface);
if (ret) {
if (errno == ENODATA) {
if (debug) {
printf("Device already detached\n");
}
}
else {
if (debug) {
printf("Detach failed: %s[%d]\n", strerror(errno), errno);
printf("Continuing anyway\n");
}
}
}
else {
if (debug) {
printf("detach successful\n");
}
}
}
usb_dev_handle* setup_libusb_access() {
usb_dev_handle *lvr_winusb;
if (debug) {
usb_set_debug(255);
}
else {
usb_set_debug(0);
}
usb_init();
usb_find_busses();
usb_find_devices();
if (!(lvr_winusb = find_lvr_winusb())) {
printf("Couldn't find the USB device, exiting.\n");
return NULL;
}
usb_detach(lvr_winusb, INTERFACE1);
usb_detach(lvr_winusb, INTERFACE2);
// reset device
if (usb_reset(lvr_winusb) != 0) {
printf("Could not reset device.\n");
return NULL;
}
if (usb_set_configuration(lvr_winusb, 0x01) < 0) {
printf("Could not set configuration 1.\n");
return NULL;
}
// Microdia tiene 2 interfaces
if (usb_claim_interface(lvr_winusb, INTERFACE1) < 0) {
printf("Could not claim interface.\n");
return NULL;
}
if (usb_claim_interface(lvr_winusb, INTERFACE2) < 0) {
printf("Could not claim interface.\n");
return NULL;
}
return lvr_winusb;
}
static void read_product_string(usb_dev_handle *handle, struct usb_device *dev) {
char prodIdStr[256];
const struct product_hw *p;
int strLen;
memset(prodIdStr, 0, sizeof(prodIdStr));
strLen = usb_get_string_simple(handle, dev->descriptor.iProduct, prodIdStr, sizeof(prodIdStr)-1);
if (debug) {
if (strLen < 0) {
puts("Couldn't read iProduct string");
}
else {
printf("iProduct: %s\n", prodIdStr);
}
}
for (p = product_ids; p->id_string; ++p) {
if (!strncmp(p->id_string, prodIdStr, sizeof(prodIdStr))) {
break;
}
}
tempOffset = p->offset;
}
usb_dev_handle *find_lvr_winusb() {
struct usb_bus *bus;
struct usb_device *dev;
for (bus = usb_busses; bus; bus = bus->next) {
for (dev = bus->devices; dev; dev = dev->next) {
if (dev->descriptor.idVendor == VENDOR_ID && dev->descriptor.idProduct == PRODUCT_ID ) {
usb_dev_handle *handle;
if (debug) {
printf("lvr_winusb with Vendor Id: %x and Product Id: %x found.\n", VENDOR_ID, PRODUCT_ID);
}
if (!(handle = usb_open(dev))) {
printf("Could not open USB device\n");
return NULL;
}
read_product_string(handle, dev);
return handle;
}
}
}
return NULL;
}
void ini_control_transfer(usb_dev_handle *dev) {
int r,i;
char question[] = { 0x01, 0x01 };
r = usb_control_msg(dev, 0x21, 0x09, 0x0201, 0x00, (char *) question, 2, timeout);
if (r < 0) {
perror("USB control write"); bad("USB write failed");
}
if (debug) {
for (i=0; i < reqIntLen; i++) {
printf("%02x ", question[i] & 0xFF);
}
printf("\n");
}
}
void control_transfer(usb_dev_handle *dev, const char *pquestion) {
int r,i;
char question[reqIntLen];
memcpy(question, pquestion, sizeof question);
r = usb_control_msg(dev, 0x21, 0x09, 0x0200, 0x01, (char *) question, reqIntLen, timeout);
if (r < 0) {
perror("USB control write"); bad("USB write failed");
}
if(debug) {
for (i=0; i < reqIntLen; i++) {
printf("%02x ", question[i] & 0xFF);
}
printf("\n");
}
}
void interrupt_transfer(usb_dev_handle *dev) {
int r,i;
char answer[reqIntLen];
char question[reqIntLen];
for (i=0; i < reqIntLen; i++) {
question[i]=i;
}
r = usb_interrupt_write(dev, endpoint_Int_out, question, reqIntLen, timeout);
if (r < 0) {
perror("USB interrupt write"); bad("USB write failed");
}
r = usb_interrupt_read(dev, endpoint_Int_in, answer, reqIntLen, timeout);
if (r != reqIntLen) {
perror("USB interrupt read1"); bad("USB read failed");
}
if (debug) {
for (i=0; i < reqIntLen; i++) {
printf("%i, %i, \n", question[i], answer[i]);
}
}
usb_release_interface(dev, 0);
}
void interrupt_read(usb_dev_handle *dev) {
int r,i;
unsigned char answer[reqIntLen];
bzero(answer, reqIntLen);
r = usb_interrupt_read(dev, 0x82, (char*)answer, reqIntLen, timeout);
if (r != reqIntLen) {
printf("r=%d. expected %d.\n", r, reqIntLen);
perror("USB interrupt read2"); bad("USB read failed");
}
if (debug) {
for (i=0; i < reqIntLen; i++) {
printf("%02x ", answer[i] & 0xFF);
}
printf("\n");
}
}
float interrupt_read_temperature(usb_dev_handle *dev) {
int r,i;
unsigned char answer[reqIntLen];
bzero(answer, reqIntLen);
r = usb_interrupt_read(dev, 0x82, (char*)answer, reqIntLen, timeout);
if (r != reqIntLen) {
perror("USB interrupt read3"); bad("USB read failed");
}
if (debug) {
for (i=0; i < reqIntLen; i++) {
printf("%02x ", answer[i] & 0xFF);
}
printf("\n");
}
/* Temperature in C is a 16-bit signed fixed-point number, big-endian */
return (float)(signed char)answer[tempOffset] + answer[tempOffset+1] / 256.0f;
}
void ex_program(int sig) {
bsalir=1;
(void) signal(SIGINT, SIG_DFL);
}
int main(int argc, char **argv) {
int c;
while ((c = getopt (argc, argv, "mfcvhl::")) != -1) {
switch (c) {
case 'v':
debug = 1;
break;
case 'l':
if (optarg != NULL) {
if (!sscanf(optarg,"%i",&seconds) == 1) {
fprintf(stderr, "Error: '%s' is not numeric.\n", optarg);
exit(EXIT_FAILURE);
}
else {
bsalir = 0;
break;
}
}
else {
bsalir = 0;
seconds = 5;
break;
}
case 'h':
printf("Available options:\n");
printf(" -h help\n");
printf(" -v verbose\n");
printf(" -l[n] loop every 'n' seconds, default value is 5s\n");
exit(EXIT_FAILURE);
default:
if (isprint (optopt))
fprintf (stderr, "Unknown option `-%c'.\n", optopt);
else
fprintf (stderr, "Unknown option character `\\x%x'.\n", optopt);
exit(EXIT_FAILURE);
}
}
if (optind < argc) {
fprintf(stderr, "Non-option ARGV-elements, try -h for help.\n");
exit(EXIT_FAILURE);
}
usb_dev_handle *lvr_winusb = NULL;
if ((lvr_winusb = setup_libusb_access()) == NULL) {
exit(EXIT_FAILURE);
}
signal(SIGINT, ex_program);
ini_control_transfer(lvr_winusb);
control_transfer(lvr_winusb, uTemp);
interrupt_read(lvr_winusb);
control_transfer(lvr_winusb, uIni1);
interrupt_read(lvr_winusb);
control_transfer(lvr_winusb, uIni2);
interrupt_read(lvr_winusb);
interrupt_read(lvr_winusb);
do {
control_transfer(lvr_winusb, uTemp);
float temp_c = interrupt_read_temperature(lvr_winusb);
time_t t = time(NULL);
struct tm *local = localtime(&t);
printf("%04d/%02d/%02d %02d:%02d:%02d ",
local->tm_year + 1900,
local->tm_mon + 1,
local->tm_mday,
local->tm_hour,
local->tm_min,
local->tm_sec);
printf("Temperature %f\n", temp_c);
fflush(stdout);
if (!bsalir)
sleep(seconds);
} while (!bsalir);
usb_release_interface(lvr_winusb, INTERFACE1);
usb_release_interface(lvr_winusb, INTERFACE2);
usb_close(lvr_winusb);
return 0;
}