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authorFlorian Jung <flo@windfisch.org>2014-03-20 17:44:06 +0100
committerFlorian Jung <flo@windfisch.org>2014-06-19 23:48:56 +0200
commitef0613fc6a5eef89df1cff5c695e1ccf844359f9 (patch)
tree8b834f83a369c3f538dbe86062bfb81f0922a7e0 /pc-client.c
parenta400be8ac4d44f3f35fc362081927bc750b1f551 (diff)
initial experiments
Diffstat (limited to 'pc-client.c')
-rw-r--r--pc-client.c159
1 files changed, 159 insertions, 0 deletions
diff --git a/pc-client.c b/pc-client.c
new file mode 100644
index 0000000..1b6cb21
--- /dev/null
+++ b/pc-client.c
@@ -0,0 +1,159 @@
+#include <string.h>
+#include <usb.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+
+#define USB_LED_OFF 0
+#define USB_LED_ON 1
+
+
+/* Used to get descriptor strings for device identification */
+static int usbGetDescriptorString(usb_dev_handle *dev, int index, int langid,
+ char *buf, int buflen) {
+ char buffer[256];
+ int rval, i;
+
+ // make standard request GET_DESCRIPTOR, type string and given index
+ // (e.g. dev->iProduct)
+ rval = usb_control_msg(dev,
+ USB_TYPE_STANDARD | USB_RECIP_DEVICE | USB_ENDPOINT_IN,
+ USB_REQ_GET_DESCRIPTOR, (USB_DT_STRING << 8) + index, langid,
+ buffer, sizeof(buffer), 1000);
+
+ if(rval < 0) // error
+ return rval;
+
+ // rval should be bytes read, but buffer[0] contains the actual response size
+ if((unsigned char)buffer[0] < rval)
+ rval = (unsigned char)buffer[0]; // string is shorter than bytes read
+
+ if(buffer[1] != USB_DT_STRING) // second byte is the data type
+ return 0; // invalid return type
+
+ // we're dealing with UTF-16LE here so actual chars is half of rval,
+ // and index 0 doesn't count
+ rval /= 2;
+
+ /* lossy conversion to ISO Latin1 */
+ for(i = 1; i < rval && i < buflen; i++) {
+ if(buffer[2 * i + 1] == 0)
+ buf[i-1] = buffer[2 * i];
+ else
+ buf[i-1] = '?'; /* outside of ISO Latin1 range */
+ }
+ buf[i-1] = 0;
+
+ return i-1;
+}
+
+static usb_dev_handle * usbOpenDevice(int vendor, char *vendorName,
+ int product, char *productName) {
+ struct usb_bus *bus;
+ struct usb_device *dev;
+ char devVendor[256], devProduct[256];
+
+ usb_dev_handle * handle = NULL;
+
+ 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)
+ continue;
+
+ /* we need to open the device in order to query strings */
+ if(!(handle = usb_open(dev))) {
+ fprintf(stderr, "Warning: cannot open USB device: %s\n",
+ usb_strerror());
+ continue;
+ }
+
+ /* get vendor name */
+ if(usbGetDescriptorString(handle, dev->descriptor.iManufacturer,
+ 0x0409, devVendor, sizeof(devVendor)) < 0) {
+ fprintf(stderr,
+ "Warning: cannot query manufacturer for device: %s\n",
+ usb_strerror());
+ usb_close(handle);
+ continue;
+ }
+
+ /* get product name */
+ if(usbGetDescriptorString(handle, dev->descriptor.iProduct,
+ 0x0409, devProduct, sizeof(devVendor)) < 0) {
+ fprintf(stderr,
+ "Warning: cannot query product for device: %s\n",
+ usb_strerror());
+ usb_close(handle);
+ continue;
+ }
+
+ if(strcmp(devVendor, vendorName) == 0 &&
+ strcmp(devProduct, productName) == 0)
+ return handle;
+ else
+ usb_close(handle);
+ }
+ }
+
+ return NULL;
+}
+
+int main(int argc, char **argv) {
+ usb_dev_handle *handle = NULL;
+ int nBytes = 0;
+ char buffer[256];
+
+ if(argc < 2) {
+ printf("Usage:\n");
+ printf("usbtext.exe on\n");
+ printf("usbtext.exe off\n");
+ exit(1);
+ }
+
+ handle = usbOpenDevice(0x16C0, "windfisch.org", 0x05DC, "Flo Test");
+
+ if(handle == NULL) {
+ fprintf(stderr, "Could not find USB device!\n");
+ exit(1);
+ }
+
+ if(strcmp(argv[1], "on") == 0) {
+ nBytes = usb_control_msg(handle,
+ USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_ENDPOINT_IN,
+ USB_LED_ON, 0, 0, (char *)buffer, sizeof(buffer), 5000);
+ } else if(strcmp(argv[1], "off") == 0) {
+ nBytes = usb_control_msg(handle,
+ USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_ENDPOINT_IN,
+ USB_LED_OFF, 0, 0, (char *)buffer, sizeof(buffer), 5000);
+ } else if (strcmp(argv[1], "read") == 0) {
+ char buffer[1024];
+ nBytes = usb_control_msg(handle,
+ USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_ENDPOINT_IN,
+ 2, 0, 0, buffer, sizeof(buffer), 5000);
+ printf("received %i bytes: %s\n", nBytes, buffer);
+ } else if (strcmp(argv[1], "change") == 0) {
+ nBytes = usb_control_msg(handle,
+ USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_ENDPOINT_IN,
+ 3, 32, 4, buffer, sizeof(buffer), 5000);
+ buffer[nBytes]=0;
+ printf("received %i bytes: %s\n", nBytes, buffer);
+ } else if (strcmp(argv[1], "write") == 0) {
+ nBytes = usb_control_msg(handle,
+ USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_ENDPOINT_OUT,
+ 4, 0, 0, argv[2], strlen(argv[2])+1, 5000);
+ buffer[nBytes]=0;
+ printf("received %i bytes: %s\n", nBytes, buffer);
+ }
+
+ if(nBytes < 0)
+ fprintf(stderr, "USB error: %s\n", usb_strerror());
+
+ usb_close(handle);
+
+ return 0;
+}