Serialize struct am7xxx_header properly before sending it on the wire

[libam7xxx.git] / src / am7xxx.h

diff --git a/src/am7xxx.h b/src/am7xxx.h
index 5b5f111..49510eb 100644 (file)
--- a/src/am7xxx.h
+++ b/src/am7xxx.h
@@ -47,6 +47,13 @@ typedef enum {
        AM7XXX_POWER_HIGH = 3,
 } am7xxx_power_mode;
 
+struct am7xxx_generic_header {
+       uint32_t field0;
+       uint32_t field1;
+       uint32_t field2;
+       uint32_t field3;
+};
+
 struct am7xxx_image_header {
        uint32_t format;
        uint32_t width;
@@ -70,6 +77,12 @@ struct am7xxx_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
  */
 
+/* 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_header {
        uint32_t packet_type;
        uint8_t unknown0;
@@ -77,6 +90,7 @@ struct am7xxx_header {
        uint8_t unknown2;
        uint8_t unknown3;
        union {
+               struct am7xxx_generic_header data;
                struct am7xxx_image_header image;
                struct am7xxx_power_header power;
        } header_data;