Add initial support for USB output communication

[libam7xxx.git] / picoproj.c

diff --git a/picoproj.c b/picoproj.c
index 32f90ea..a5e5075 100644 (file)
--- a/picoproj.c
+++ b/picoproj.c
@@ -22,8 +22,19 @@
 #include <string.h>
 #include <endian.h>
 #include <errno.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#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,
@@ -150,7 +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;
 }
 
@@ -221,9 +243,11 @@ static void usage(char *name)
 int main(int argc, char *argv[])
 {
        int ret;
+       int exit_code = EXIT_SUCCESS;
        int opt;
 
        char filename[FILENAME_MAX] = {0};
+       int image_fd = -1;
        int format = AM7x01_IMAGE_FORMAT_JPEG;
        int width = 800;
        int height = 480;
@@ -262,11 +286,74 @@ int main(int argc, char *argv[])
                }
        }
 
+       if (filename[0] != '\0') {
+               struct stat st;
+               
+               image_fd = open(filename, O_RDONLY);
+               if (image_fd < 0) {
+                       perror("open");
+                       exit_code = EXIT_FAILURE;
+                       goto out;
+               }
+               if (fstat(image_fd, &st) < 0) {
+                       perror("fstat");
+                       exit_code = EXIT_FAILURE;
+                       goto out_close_image_fd;
+               }
+               size = st.st_size;
+
+               image = mmap(NULL, st.st_size, PROT_READ, MAP_SHARED, image_fd, 0);
+               if (image == NULL) {
+                       perror("mmap");
+                       exit_code = EXIT_FAILURE;
+                       goto out_close_image_fd;
+               }
+       }
+
+       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");
-               exit(EXIT_FAILURE);
+               exit_code = EXIT_FAILURE;
+               goto cleanup;
+       }
+
+       exit_code = EXIT_SUCCESS;
+
+cleanup:
+       libusb_close(dev);
+
+out_libusb_exit:
+       libusb_exit(NULL);
+
+       if (image != NULL) {
+               ret = munmap(image, size);
+               if (ret < 0)
+                       perror("munmap");
+       }
+
+out_close_image_fd:
+       if (image_fd >= 0) {
+               ret = close(image_fd);
+               if (ret < 0)
+                       perror("close");
        }
 
-       exit(EXIT_SUCCESS);
+out:
+       exit(exit_code);
 }