#include <stdio.h>
#include <stdlib.h>
+#include <string.h>
#include <errno.h>
+#include <libusb.h>
#include "am7xxx.h"
#include "serialize.h"
#define AM7XXX_VENDOR_ID 0x1de1
#define AM7XXX_PRODUCT_ID 0xc101
+/* The header size on the wire is known to be always 24 bytes, regardless of
+ * the memory configuration enforced by different architechtures or compilers
+ * for struct am7xxx_header
+ */
+#define AM7XXX_HEADER_WIRE_SIZE 24
+
+struct _am7xxx_device {
+ libusb_device_handle *usb_device;
+ uint8_t buffer[AM7XXX_HEADER_WIRE_SIZE];
+};
+
+typedef enum {
+ AM7XXX_PACKET_TYPE_DEVINFO = 0x01,
+ AM7XXX_PACKET_TYPE_IMAGE = 0x02,
+ AM7XXX_PACKET_TYPE_POWER = 0x04,
+ AM7XXX_PACKET_TYPE_UNKNOWN = 0x05,
+} am7xxx_packet_type;
+
+struct am7xxx_generic_header {
+ uint32_t field0;
+ uint32_t field1;
+ uint32_t field2;
+ uint32_t field3;
+};
+
+struct am7xxx_devinfo_header {
+ uint32_t native_width;
+ uint32_t native_height;
+ uint32_t unknown0;
+ uint32_t unknown1;
+};
+
+struct am7xxx_image_header {
+ uint32_t format;
+ uint32_t width;
+ uint32_t height;
+ uint32_t image_size;
+};
+
+struct am7xxx_power_header {
+ uint32_t bit2;
+ uint32_t bit1;
+ uint32_t bit0;
+};
+
+/*
+ * Examples of packet headers:
+ *
+ * Image header:
+ * 02 00 00 00 00 10 3e 10 01 00 00 00 20 03 00 00 e0 01 00 00 53 E8 00 00
+ *
+ * Power header:
+ * 04 00 00 00 00 0c ff ff 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+ */
+
+struct am7xxx_header {
+ uint32_t packet_type;
+ uint8_t unknown0;
+ uint8_t header_data_len;
+ uint8_t unknown2;
+ uint8_t unknown3;
+ union {
+ struct am7xxx_generic_header data;
+ struct am7xxx_devinfo_header devinfo;
+ struct am7xxx_image_header image;
+ struct am7xxx_power_header power;
+ } header_data;
+};
+
+
static void dump_devinfo_header(struct am7xxx_devinfo_header *d)
{
if (d == NULL)
fflush(stdout);
}
-static int read_data(am7xxx_device dev, uint8_t *buffer, unsigned int len)
+static int read_data(am7xxx_device *dev, uint8_t *buffer, unsigned int len)
{
int ret;
- int transferred;
+ int transferred = 0;
- ret = libusb_bulk_transfer(dev, 0x81, buffer, len, &transferred, 0);
+ ret = libusb_bulk_transfer(dev->usb_device, 0x81, 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 0;
}
-static int send_data(am7xxx_device dev, uint8_t *buffer, unsigned int len)
+static int send_data(am7xxx_device *dev, uint8_t *buffer, unsigned int len)
{
int ret;
- int transferred;
+ int transferred = 0;
#if DEBUG
printf("\nsending -->\n");
printf("\n");
#endif
- ret = libusb_bulk_transfer(dev, 1, buffer, len, &transferred, 0);
+ ret = libusb_bulk_transfer(dev->usb_device, 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);
h->header_data.data.field3 = get_le32(buffer_iterator);
}
-static int read_header(am7xxx_device dev, struct am7xxx_header *h)
+static int read_header(am7xxx_device *dev, struct am7xxx_header *h)
{
- uint8_t *buffer;
int ret;
- buffer = calloc(AM7XXX_HEADER_WIRE_SIZE, 1);
- if (buffer == NULL) {
- perror("calloc buffer");
- return -ENOMEM;
- }
-
- ret = read_data(dev, buffer, AM7XXX_HEADER_WIRE_SIZE);
+ ret = read_data(dev, dev->buffer, AM7XXX_HEADER_WIRE_SIZE);
if (ret < 0)
goto out;
- unserialize_header(buffer, h);
+ unserialize_header(dev->buffer, h);
#if DEBUG
printf("\n");
ret = 0;
out:
- free(buffer);
return ret;
}
-static int send_header(am7xxx_device dev, struct am7xxx_header *h)
+static int send_header(am7xxx_device *dev, struct am7xxx_header *h)
{
- uint8_t *buffer;
int ret;
#if DEBUG
printf("\n");
#endif
- buffer = calloc(AM7XXX_HEADER_WIRE_SIZE, 1);
- if (buffer == NULL) {
- perror("calloc buffer");
- return -ENOMEM;
- }
-
- serialize_header(h, buffer);
- ret = send_data(dev, buffer, AM7XXX_HEADER_WIRE_SIZE);
+ serialize_header(h, dev->buffer);
+ ret = send_data(dev, dev->buffer, AM7XXX_HEADER_WIRE_SIZE);
if (ret < 0)
fprintf(stderr, "send_header: failed to send data.\n");
- free(buffer);
return ret;
}
-am7xxx_device am7xxx_init(void)
+am7xxx_device *am7xxx_init(void)
{
- am7xxx_device dev;
+ unsigned int i;
+
+ am7xxx_device *dev = malloc(sizeof(*dev));
+ if (dev == NULL) {
+ perror("malloc");
+ goto out;
+ }
+ memset(dev, 0, sizeof(*dev));
libusb_init(NULL);
libusb_set_debug(NULL, 3);
- dev = libusb_open_device_with_vid_pid(NULL,
+ dev->usb_device = libusb_open_device_with_vid_pid(NULL,
AM7XXX_VENDOR_ID,
AM7XXX_PRODUCT_ID);
- if (dev == NULL) {
+ if (dev->usb_device == NULL) {
errno = ENODEV;
perror("libusb_open_device_with_vid_pid");
goto out_libusb_exit;
}
- libusb_set_configuration(dev, 1);
- libusb_claim_interface(dev, 0);
+ libusb_set_configuration(dev->usb_device, 1);
+ libusb_claim_interface(dev->usb_device, 0);
return dev;
out_libusb_exit:
libusb_exit(NULL);
+ free(dev);
+out:
return NULL;
}
-void am7xxx_shutdown(am7xxx_device dev)
+void am7xxx_shutdown(am7xxx_device *dev)
{
if (dev) {
- libusb_close(dev);
+ libusb_close(dev->usb_device);
libusb_exit(NULL);
+ free(dev);
+ dev = NULL;
}
}
-int am7xxx_get_device_info(am7xxx_device dev,
+int am7xxx_get_device_info(am7xxx_device *dev,
unsigned int *native_width,
unsigned int *native_height,
unsigned int *unknown0,
return 0;
}
-int am7xxx_send_image(am7xxx_device dev,
+int am7xxx_send_image(am7xxx_device *dev,
am7xxx_image_format format,
unsigned int width,
unsigned int height,
return send_data(dev, image, size);
}
-int am7xxx_set_power_mode(am7xxx_device dev, am7xxx_power_mode mode)
+int am7xxx_set_power_mode(am7xxx_device *dev, am7xxx_power_mode mode)
{
int ret;
struct am7xxx_header h = {