Implement am7xxx_get_device_info()

Add support for packet type 0x01, which can be used to query device
information like the native width and native height.

Introduce also read_data(), read_header(), unserialize_header()
which are needed by am7xxx_get_device_info()

diff --git a/src/am7xxx.c b/src/am7xxx.c
index 90dcc8c..cdcbf3f 100644 (file)
--- a/src/am7xxx.c
+++ b/src/am7xxx.c
@@ -26,6 +26,18 @@
 #define AM7XXX_VENDOR_ID  0x1de1
 #define AM7XXX_PRODUCT_ID 0xc101
 
+static void dump_devinfo_header(struct am7xxx_devinfo_header *d)
+{
+       if (d == NULL)
+               return;
+
+       printf("Info header:\n");
+       printf("\tnative_width:  0x%08x (%u)\n", d->native_width, d->native_width);
+       printf("\tnative_height: 0x%08x (%u)\n", d->native_height, d->native_height);
+       printf("\tunknown0:      0x%08x (%u)\n", d->unknown0, d->unknown0);
+       printf("\tunknown1:      0x%08x (%u)\n", d->unknown1, d->unknown1);
+}
+
 static void dump_image_header(struct am7xxx_image_header *i)
 {
        if (i == NULL)
@@ -61,6 +73,10 @@ static void dump_header(struct am7xxx_header *h)
        printf("unknown3:        0x%02hhx (%hhu)\n", h->unknown3, h->unknown3);
 
        switch(h->packet_type) {
+       case AM7XXX_PACKET_TYPE_DEVINFO:
+               dump_devinfo_header(&(h->header_data.devinfo));
+               break;
+
        case AM7XXX_PACKET_TYPE_IMAGE:
                dump_image_header(&(h->header_data.image));
                break;
@@ -97,6 +113,27 @@ static void dump_buffer(uint8_t *buffer, unsigned int len)
        fflush(stdout);
 }
 
+static int read_data(am7xxx_device dev, uint8_t *buffer, unsigned int len)
+{
+       int ret;
+       int transferred;
+
+       ret = libusb_bulk_transfer(dev, 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 ret;
+       }
+
+#if DEBUG
+       printf("\n<-- received\n");
+       dump_buffer(buffer, len);
+       printf("\n");
+#endif
+
+       return 0;
+}
+
 static int send_data(am7xxx_device dev, uint8_t *buffer, unsigned int len)
 {
        int ret;
@@ -133,6 +170,51 @@ static void serialize_header(struct am7xxx_header *h, uint8_t *buffer)
        put_le32(h->header_data.data.field3, buffer_iterator);
 }
 
+static void unserialize_header(uint8_t *buffer, struct am7xxx_header *h)
+{
+       uint8_t **buffer_iterator = &buffer;
+
+       h->packet_type = get_le32(buffer_iterator);
+       h->unknown0 = get_8(buffer_iterator);
+       h->header_data_len = get_8(buffer_iterator);
+       h->unknown2 = get_8(buffer_iterator);
+       h->unknown3 = get_8(buffer_iterator);
+       h->header_data.data.field0 = get_le32(buffer_iterator);
+       h->header_data.data.field1 = get_le32(buffer_iterator);
+       h->header_data.data.field2 = get_le32(buffer_iterator);
+       h->header_data.data.field3 = get_le32(buffer_iterator);
+}
+
+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);
+       if (ret < 0)
+               goto out;
+
+       unserialize_header(buffer, h);
+
+#if DEBUG
+       printf("\n");
+       dump_header(h);
+       printf("\n");
+#endif
+
+       ret = 0;
+
+out:
+       free(buffer);
+       return ret;
+}
+
 static int send_header(am7xxx_device dev, struct am7xxx_header *h)
 {
        uint8_t *buffer;
@@ -193,6 +275,45 @@ void am7xxx_shutdown(am7xxx_device dev)
        }
 }
 
+int am7xxx_get_device_info(am7xxx_device dev,
+                          unsigned int *native_width,
+                          unsigned int *native_height,
+                          unsigned int *unknown0,
+                          unsigned int *unknown1)
+{
+       int ret;
+       struct am7xxx_header h = {
+               .packet_type     = AM7XXX_PACKET_TYPE_DEVINFO,
+               .unknown0        = 0x00,
+               .header_data_len = 0x00,
+               .unknown2        = 0x3e,
+               .unknown3        = 0x10,
+               .header_data = {
+                       .devinfo = {
+                               .native_width  = 0,
+                               .native_height = 0,
+                               .unknown0      = 0,
+                               .unknown1      = 0,
+                       },
+               },
+       };
+
+       ret = send_header(dev, &h);
+       if (ret < 0)
+               return ret;
+
+       ret = read_header(dev, &h);
+       if (ret < 0)
+               return ret;
+
+       *native_width = h.header_data.devinfo.native_width;
+       *native_height = h.header_data.devinfo.native_height;
+       *unknown0 = h.header_data.devinfo.unknown0;
+       *unknown1 = h.header_data.devinfo.unknown1;
+
+       return 0;
+}
+
 int am7xxx_send_image(am7xxx_device dev,
                      am7xxx_image_format format,
                      unsigned int width,

diff --git a/src/am7xxx.h b/src/am7xxx.h
index 6847796..393c53f 100644 (file)
--- a/src/am7xxx.h
+++ b/src/am7xxx.h
@@ -29,7 +29,7 @@ extern "C" {
 typedef libusb_device_handle *am7xxx_device;
 
 typedef enum {
-       AM7XXX_PACKET_TYPE_INIT    = 0x01,
+       AM7XXX_PACKET_TYPE_DEVINFO = 0x01,
        AM7XXX_PACKET_TYPE_IMAGE   = 0x02,
        AM7XXX_PACKET_TYPE_POWER   = 0x04,
        AM7XXX_PACKET_TYPE_UNKNOWN = 0x05,
@@ -55,6 +55,13 @@ struct am7xxx_generic_header {
        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;
@@ -92,6 +99,7 @@ struct am7xxx_header {
        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;
@@ -101,6 +109,12 @@ am7xxx_device am7xxx_init(void);
 
 void am7xxx_shutdown(am7xxx_device dev);
 
+int am7xxx_get_device_info(am7xxx_device dev,
+                          unsigned int *native_width,
+                          unsigned int *native_height,
+                          unsigned int *unknown0,
+                          unsigned int *unknown1);
+
 int am7xxx_send_image(am7xxx_device dev,
                      am7xxx_image_format format,
                      unsigned int width,

diff --git a/src/picoproj.c b/src/picoproj.c
index 1aa6b04..8d511b9 100644 (file)
--- a/src/picoproj.c
+++ b/src/picoproj.c
@@ -56,6 +56,10 @@ int main(int argc, char *argv[])
        int height = 480;
        uint8_t *image;
        unsigned int size;
+       unsigned int native_width;
+       unsigned int native_height;
+       unsigned int unknown0;
+       unsigned int unknown1;
 
        while ((opt = getopt(argc, argv, "f:F:W:H:h")) != -1) {
                switch (opt) {
@@ -133,6 +137,16 @@ int main(int argc, char *argv[])
                goto out_munmap;
        }
 
+       ret = am7xxx_get_device_info(dev, &native_width, &native_height, &unknown0, &unknown1);
+       if (ret < 0) {
+               perror("am7xxx_get_info");
+               exit_code = EXIT_FAILURE;
+               goto cleanup;
+       }
+       printf("Native resolution: %dx%d\n", native_width, native_height);
+       printf("Unknown0: %d\n", unknown0);
+       printf("Unknown1: %d\n", unknown1);
+
        ret = am7xxx_set_power_mode(dev, AM7XXX_POWER_LOW);
        if (ret < 0) {
                perror("am7xxx_set_power_mode");