fix g_dfu access from both DFU and runtime access
We need to refer to g_dfu as a pointer from all code. In DFU mode, it
gets assigned to the address of _g_dfu, which is placed by the linker
script at the start of RAM. In runtime mode, the pointer is statically
defined to point at the start of RAM. The linker script for the runtime
(dfu environment) is adjusted to save the first 32 bytes for the _g_dfu
structure.
diff --git a/firmware/atmel_softpack_libraries/usb/device/dfu/dfu.h b/firmware/atmel_softpack_libraries/usb/device/dfu/dfu.h
index 9033de6..b49cce0 100644
--- a/firmware/atmel_softpack_libraries/usb/device/dfu/dfu.h
+++ b/firmware/atmel_softpack_libraries/usb/device/dfu/dfu.h
@@ -98,7 +98,7 @@
unsigned int total_bytes;
};
-extern struct dfudata g_dfu;
+extern struct dfudata *g_dfu;
void set_usb_serial_str(const uint8_t *serial_usbstr);