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/* Name: powerSwitch.c
* Project: PowerSwitch based on AVR USB driver
* Author: Christian Starkjohann
* Creation Date: 2005-01-16
* Tabsize: 4
* Copyright: (c) 2005 by OBJECTIVE DEVELOPMENT Software GmbH
* License: GNU GPL v2 (see License.txt) or proprietary (CommercialLicense.txt)
* This Revision: $Id$
*/
/*
General Description:
This program controls the PowerSwitch USB device from the command line.
It must be linked with libusb, a library for accessing the USB bus from
Linux, FreeBSD, Mac OS X and other Unix operating systems. Libusb can be
obtained from http://libusb.sourceforge.net/.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <usb.h> /* this is libusb, see http://libusb.sourceforge.net/ */
#define USBDEV_SHARED_VENDOR 0x16C0 /* VOTI */
#define USBDEV_SHARED_PRODUCT 0x05DC /* Obdev's free shared PID */
/* Use obdev's generic shared VID/PID pair and follow the rules outlined
* in firmware/usbdrv/USBID-License.txt.
*/
#define PSCMD_ECHO 0
#define PSCMD_GET 1
#define PSCMD_ON 2
#define PSCMD_OFF 3
/* These are the vendor specific SETUP commands implemented by our USB device */
static int usbGetStringAscii(usb_dev_handle *dev, int index, int langid, char *buf, int buflen)
{
char buffer[256];
int rval, i;
if((rval = usb_control_msg(dev, USB_ENDPOINT_IN, USB_REQ_GET_DESCRIPTOR, (USB_DT_STRING << 8) + index, langid, buffer, sizeof(buffer), 1000)) < 0)
return rval;
if(buffer[1] != USB_DT_STRING)
return 0;
if((unsigned char)buffer[0] < rval)
rval = (unsigned char)buffer[0];
rval /= 2;
/* lossy conversion to ISO Latin1 */
for(i=1;i<rval;i++){
if(i > buflen) /* destination buffer overflow */
break;
buf[i-1] = buffer[2 * i];
if(buffer[2 * i + 1] != 0) /* outside of ISO Latin1 range */
buf[i-1] = '?';
}
buf[i-1] = 0;
return i-1;
}
/* PowerSwitch uses the free shared default VID/PID. If you want to see an
* example device lookup where an individually reserved PID is used, see our
* RemoteSensor reference implementation.
*/
#define USB_ERROR_NOTFOUND 1
#define USB_ERROR_ACCESS 2
#define USB_ERROR_IO 3
static int usbOpenDevice(usb_dev_handle **device, int vendor, char *vendorName, int product, char *productName)
{
struct usb_bus *bus;
struct usb_device *dev;
usb_dev_handle *handle = NULL;
int errorCode = USB_ERROR_NOTFOUND;
static int didUsbInit = 0;
if(!didUsbInit){
didUsbInit = 1;
usb_init();
}
usb_find_busses();
usb_find_devices();
for(bus=usb_get_busses(); bus; bus=bus->next){
for(dev=bus->devices; dev; dev=dev->next){
if(dev->descriptor.idVendor == vendor && dev->descriptor.idProduct == product){
char string[256];
int len;
handle = usb_open(dev); /* we need to open the device in order to query strings */
if(!handle){
errorCode = USB_ERROR_ACCESS;
fprintf(stderr, "Warning: cannot open USB device: %s\n", usb_strerror());
continue;
}
if(vendorName == NULL && productName == NULL){ /* name does not matter */
break;
}
/* now check whether the names match: */
len = usbGetStringAscii(handle, dev->descriptor.iManufacturer, 0x0409, string, sizeof(string));
if(len < 0){
errorCode = USB_ERROR_IO;
fprintf(stderr, "Warning: cannot query manufacturer for device: %s\n", usb_strerror());
}else{
errorCode = USB_ERROR_NOTFOUND;
/* fprintf(stderr, "seen device from vendor ->%s<-\n", string); */
if(strcmp(string, vendorName) == 0){
len = usbGetStringAscii(handle, dev->descriptor.iProduct, 0x0409, string, sizeof(string));
if(len < 0){
errorCode = USB_ERROR_IO;
fprintf(stderr, "Warning: cannot query product for device: %s\n", usb_strerror());
}else{
errorCode = USB_ERROR_NOTFOUND;
/* fprintf(stderr, "seen product ->%s<-\n", string); */
if(strcmp(string, productName) == 0)
break;
}
}
}
usb_close(handle);
handle = NULL;
}
}
if(handle)
break;
}
if(handle != NULL){
errorCode = 0;
*device = handle;
}
return errorCode;
}
#define SDA_1 usb_control_msg(handle, USB_TYPE_VENDOR \
| USB_RECIP_DEVICE | USB_ENDPOINT_IN, \
PSCMD_ON, 0, 6, (char *)buffer, sizeof(buffer), \
5000);
#define SDA_0 usb_control_msg(handle, USB_TYPE_VENDOR \
| USB_RECIP_DEVICE | USB_ENDPOINT_IN, \
PSCMD_OFF, 0, 6, (char *)buffer, sizeof(buffer), \
5000);
#define SCL_1 usb_control_msg(handle, USB_TYPE_VENDOR \
| USB_RECIP_DEVICE | USB_ENDPOINT_IN, \
PSCMD_ON, 0, 7, (char *)buffer, sizeof(buffer), \
5000);
#define SCL_0 usb_control_msg(handle, USB_TYPE_VENDOR \
| USB_RECIP_DEVICE | USB_ENDPOINT_IN, \
PSCMD_OFF, 0, 7, (char *)buffer, sizeof(buffer), \
5000);
int main(int argc, char **argv)
{
usb_dev_handle *handle = NULL;
unsigned char buffer[8];
usb_init();
if(usbOpenDevice(&handle, USBDEV_SHARED_VENDOR, "www.obdev.at", USBDEV_SHARED_PRODUCT, "PowerSwitch") != 0){
fprintf(stderr, "Could not find USB device \"PowerSwitch\" with vid=0x%x pid=0x%x\n", USBDEV_SHARED_VENDOR, USBDEV_SHARED_PRODUCT);
exit(1);
}
/* We have searched all devices on all busses for our USB device above. Now
* try to open it and perform the vendor specific control operations for the
* function requested by the user.
*/
char line[8];
signed char i;
short int number;
SCL_1;
SDA_1;
usleep(1000);
SDA_0;
usleep(10);
SCL_0;
while (fgets(line, 8, stdin) != NULL) {
if (sscanf(line, "%hi\n", &number) == 1) {
if ((number >= 0) && (number <= 255)) {
for (i = 7; i >= 0; i--) {
usleep(3);
if (number & (1 << i)) {
SDA_1;
} else {
SDA_0;
}
usleep(3);
SCL_1;
usleep(3);
SCL_0;
}
usleep(50);
}
}
if (strcmp(line, "push\n") == 0) {
SCL_1;
usleep(3);
SDA_1;
usleep(10);
SDA_0;
usleep(10);
SCL_0;
}
}
SCL_1;
usleep(3);
SDA_1;
usleep(10);
usb_close(handle);
return 0;
}
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