diff --git a/src/libboard_artiq/src/cxp_proto.rs b/src/libboard_artiq/src/cxp_proto.rs
index dd39d76..b3b41a0 100644
--- a/src/libboard_artiq/src/cxp_proto.rs
+++ b/src/libboard_artiq/src/cxp_proto.rs
@@ -209,30 +209,6 @@ pub fn print_packetu32(pak: &[u32]) {
     println!("============================================");
 }
 
-pub fn downconn_debug_main() {
-    downconn_debug_send(&Packet::CtrlRead {
-        addr: 0x00,
-        length: 0x04,
-    });
-
-    const LEN: usize = 40;
-    let mut pak_arr: [u32; LEN] = [0; LEN];
-    let mut i: usize = 0;
-    unsafe {
-        while csr::cxp::downconn_debug_out_dout_valid_read() == 1 {
-            pak_arr[i] = csr::cxp::downconn_debug_out_dout_pak_read();
-            // println!("received {:#04X}", pak_arr[i]);
-            csr::cxp::downconn_debug_out_inc_write(1);
-            i += 1;
-            if i == LEN {
-                break;
-            }
-        }
-    }
-
-    print_packetu32(&pak_arr)
-}
-
 pub fn downconn_debug_send(packet: &Packet) -> Result<(), Error> {
     let mut buffer: [u8; MAX_PACKET] = [0; MAX_PACKET];
     let mut writer = Cursor::new(&mut buffer[..]);