Add initial support for USB output communication

diff --git a/picoproj.c b/picoproj.c
index 161be49..a5e5075 100644 (file)
--- a/picoproj.c
+++ b/picoproj.c
@@ -28,6 +28,13 @@
 #include <fcntl.h>
 #include <unistd.h>
 
+#include <libusb.h>
+
+#define AM7x01_VENDOR_ID  0x1de1
+#define AM7x01_PRODUCT_ID 0xc101
+
+static libusb_device_handle *dev;
+
 typedef enum {
        AM7x01_PACKET_TYPE_INIT    = 0x01,
        AM7x01_PACKET_TYPE_IMAGE   = 0x02,
@@ -154,7 +161,18 @@ static void dump_buffer(uint8_t *buffer, unsigned int len)
 
 static int send_data(uint8_t *buffer, unsigned int len)
 {
+       int ret;
+       int transferred;
+
        dump_buffer(buffer, len);
+
+       ret = libusb_bulk_transfer(dev, 1, buffer, len, &transferred, 0);
+       if (ret != 0 || (unsigned int)transferred != len) {
+               fprintf(stderr, "Error: ret: %d\ttransferred: %d (expected %u)\n",
+                       ret, transferred, len);
+               return ret;
+       }
+
        return 0;
 }
 
@@ -292,6 +310,22 @@ int main(int argc, char *argv[])
                }
        }
 
+       libusb_init(NULL);
+       libusb_set_debug(NULL, 3);
+
+       dev = libusb_open_device_with_vid_pid(NULL,
+                                             AM7x01_VENDOR_ID,
+                                             AM7x01_PRODUCT_ID);
+       if (dev == NULL) {
+               errno = ENODEV;
+               perror("libusb_open_device_with_vid_pid");
+               exit_code = EXIT_FAILURE;
+               goto out_libusb_exit;
+       }
+
+       libusb_set_configuration(dev, 1);
+       libusb_claim_interface(dev, 0);
+
        ret = send_image(format, width, height, image, size);
        if (ret < 0) {
                perror("send_image");
@@ -302,6 +336,11 @@ int main(int argc, char *argv[])
        exit_code = EXIT_SUCCESS;
 
 cleanup:
+       libusb_close(dev);
+
+out_libusb_exit:
+       libusb_exit(NULL);
+
        if (image != NULL) {
                ret = munmap(image, size);
                if (ret < 0)