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Merge branch 'master' of github.com:erjiang/usbscale

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This commit is contained in:
Eric Jiang 2014-01-13 22:30:56 -05:00
commit 76270a87a5
3 changed files with 31 additions and 11 deletions
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2
50-usb-scale.rules
View File

@ -1,2 +1,4 @@
SUBSYSTEM=="usb", ATTR{idVendor}=="1446", ATTR{idProduct}=="6a73", MODE="0776"
SUBSYSTEM=="usb", ATTR{idVendor}=="7b7c", ATTR{idProduct}=="0100", MODE="0776"
SUBSYSTEM=="usb", ATTR{idVendor}=="2474", ATTR{idProduct}=="0550", MODE="0776"
SUBSYSTEM=="usb", ATTR{idVendor}=="0eb8", ATTR{idProduct}=="f000", MODE="0776"

19
scales.h
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@ -10,17 +10,26 @@
#include <stdint.h>
//
// **scalesc** should be kept updated with the length of the list.
// **NSCALES** should be kept updated with the length of the list.
//
int scalesc = 2;
#define NSCALES 4
//
// What is the number of the weighing result to show, as the first result may be incorrect (from the previous weighing)
//
#define WEIGH_COUNT 2
//
// Scales
// ------
//
uint16_t scales[2][2] = {\
// Stamps.com 10-lb USB scale
uint16_t scales[NSCALES][2] = {\
// Stamps.com Model 510 5LB Scale
{0x1446, 0x6a73},
// USPS (Elane) PS311 "XM Elane Elane UParcel 30lb"
{0x7b7c, 0x0100}
{0x7b7c, 0x0100},
// Stamps.com Stainless Steel 5 lb. Digital Scale
{0x2474, 0x0550},
// Mettler Toledo
{0x0eb8, 0xf000}
};

13
usbscale.c
View File

@ -94,6 +94,8 @@ int main(void)
libusb_device* dev;
libusb_device_handle* handle;
int weigh_count = WEIGH_COUNT -1;
//
// We first try to init libusb.
//
@ -213,10 +215,13 @@ int main(void)
printf("%x\n", data[i]);
}
#endif
if (weigh_count < 1) {
scale_result = print_scale_data(data);
if(scale_result != 1)
break;
}
weigh_count--;
}
else {
fprintf(stderr, "Error in USB transfer\n");
scale_result = -1;
@ -275,13 +280,17 @@ static int print_scale_data(unsigned char* dat) {
double weight = (double)(dat[4] + (dat[5] << 8)) / 10;
if(expt != 255 && expt != 0) {
if (expt > 127) {
weight = weight * pow(10, expt-255);
} else {
weight = pow(weight, expt);
}
}
//
// The scale's first byte, its "report", is always 3.
//
if(report != 0x03) {
if(report != 0x03 && report != 0x04) {
fprintf(stderr, "Error reading scale data\n");
return -1;
}
@ -364,7 +373,7 @@ static libusb_device* find_scale(libusb_device **devs)
return NULL;
}
int i;
for (i = 0; i < scalesc; i++) {
for (i = 0; i < NSCALES; i++) {
if(desc.idVendor == scales[i][0] &&
desc.idProduct == scales[i][1]) {
/*