diff --git a/src/libksupport/src/cxp.rs b/src/libksupport/src/cxp.rs
new file mode 100644
index 0000000..5e9210c
--- /dev/null
+++ b/src/libksupport/src/cxp.rs
@@ -0,0 +1,224 @@
+use byteorder::{ByteOrder, NetworkEndian};
+use cslice::CMutSlice;
+use libboard_artiq::{cxp::{setup, MASTER_CHANNEL},
+                     cxp_ctrl,
+                     cxp_proto::DATA_MAXSIZE};
+
+// for downloading the XML files
+// TODO: change this to read bytes and accept TBytearray
+pub extern "C" fn cxp_read_words(addr: i32, val: &mut CMutSlice<i32>, with_tag: bool) {
+    let mut bytes: [u8; DATA_MAXSIZE] = [0; DATA_MAXSIZE];
+    cxp_ctrl::read_bytes(MASTER_CHANNEL, addr as u32, &mut bytes[..val.len() * 4], with_tag)
+        .unwrap_or_else(|e| panic!("CXP readu64 failure: {}", e));
+
+    for i in 0..val.len() {
+        val.as_mut_slice()[i] = NetworkEndian::read_u32(&bytes[i * 4..(i + 1) * 4]) as i32;
+    }
+}
+
+pub extern "C" fn cxp_readu32(addr: i32, with_tag: bool) -> i32 {
+    // TODO: use artiq_raise like i2c?
+    cxp_ctrl::read_u32(MASTER_CHANNEL, addr as u32, with_tag).unwrap_or_else(|e| panic!("CXP readu64 failure: {}", e))
+        as i32
+}
+
+pub extern "C" fn cxp_readu64(addr: i32, with_tag: bool) -> i64 {
+    // TODO: use artiq_raise like i2c?
+    cxp_ctrl::read_u64(MASTER_CHANNEL, addr as u32, with_tag).unwrap_or_else(|e| panic!("CXP read u64 failure: {}", e))
+        as i64
+}
+
+pub extern "C" fn cxp_writeu32(addr: i32, val: i32, with_tag: bool) {
+    // TODO: use artiq_raise like i2c?
+    cxp_ctrl::write_u32(MASTER_CHANNEL, addr as u32, val as u32, with_tag)
+        .unwrap_or_else(|e| panic!("CXP write u32 failure: {}", e));
+}
+
+pub extern "C" fn cxp_writeu64(addr: i32, val: i64, with_tag: bool) {
+    // TODO: use artiq_raise like i2c?
+    cxp_ctrl::write_u64(MASTER_CHANNEL, addr as u32, val as u64, with_tag)
+        .unwrap_or_else(|e| panic!("CXP write u64 failure: {}", e));
+}
+
+pub extern "C" fn cxp_setup() -> bool {
+    setup().unwrap()
+}
+
+// DEBUG: ONLY
+pub extern "C" fn cxp_debug_frame_print() {
+    use libboard_zynq::println;
+
+    use crate::pl::csr::{cxp_frame_pipeline, CXP};
+    const LEN: usize = 200;
+    let mut eop: [u8; LEN] = [0; LEN];
+    let mut pak_arr: [u32; LEN] = [0; LEN];
+    let mut k_arr: [u8; LEN] = [0; LEN];
+    let mut err: [u8; LEN] = [0; LEN];
+    let mut i: usize = 0;
+    unsafe {
+        while cxp_frame_pipeline::debug_out_dout_valid_read() == 1 {
+            pak_arr[i] = cxp_frame_pipeline::debug_out_dout_pak_read();
+            k_arr[i] = cxp_frame_pipeline::debug_out_kout_pak_read();
+            eop[i] = cxp_frame_pipeline::debug_out_eop_read();
+            err[i] = cxp_frame_pipeline::debug_out_crc_error_read();
+            // println!("received {:#04X}", pak_arr[i]);
+            cxp_frame_pipeline::debug_out_inc_write(1);
+            i += 1;
+            if i == LEN {
+                break;
+            }
+        }
+        // let channel: usize = 0;
+        // while (CXP[channel].downconn_debug_out_dout_valid_read)() == 1 {
+        //     pak_arr[i] = (CXP[channel].downconn_debug_out_dout_pak_read)();
+        //     k_arr[i] = (CXP[channel].downconn_debug_out_kout_pak_read)();
+        //     // println!("received {:#04X}", pak_arr[i]);
+        //     (CXP[channel].downconn_debug_out_inc_write)(1);
+        //     i += 1;
+        //     if i == LEN {
+        //         break;
+        //     }
+        // }
+        println!(
+            "Decode error = {}",
+            (CXP[MASTER_CHANNEL as usize].downconn_bootstrap_decoder_err_read)()
+        );
+        println!(
+            "Trigger ack = {}",
+            (CXP[MASTER_CHANNEL as usize].downconn_trigger_ack_read)()
+        );
+        if (CXP[MASTER_CHANNEL as usize].downconn_trigger_ack_read)() == 1 {
+            println!("Trigger ack clear");
+            (CXP[MASTER_CHANNEL as usize].downconn_trigger_ack_write)(1);
+        };
+    }
+    cxp_ctrl::print_decode_error(MASTER_CHANNEL);
+    if i > 0 {
+        print_packetu32(&pak_arr, &k_arr, &err, &eop, i as usize);
+    } else {
+        println!("No frame data received");
+    }
+}
+
+pub fn print_packetu32(pak: &[u32], k: &[u8], err: &[u8], eop: &[u8], len: usize) {
+    use libboard_zynq::println;
+    println!("pak = [");
+    let mut i_stream_id: usize = len + 1;
+    let mut i_pak_tag: usize = len + 1;
+    let mut i_size_0: usize = len + 1;
+    let mut i_size_1: usize = len + 1;
+    for i in 0..len {
+        let data: [u8; 4] = pak[i].to_be_bytes();
+        // if eop[i] == 1 {
+        //     if err[i] == 1 {
+        //         println!(
+        //             "{:#03}     {:#04X} {:#04X} {:#04X} {:#04X} | K {:04b} | eop crc error",
+        //             i + 1,
+        //             data[0],
+        //             data[1],
+        //             data[2],
+        //             data[3],
+        //             k[i],
+        //         );
+        //     } else {
+        //         println!(
+        //             "{:#03}     {:#04X} {:#04X} {:#04X} {:#04X} | K {:04b} | eop",
+        //             i + 1,
+        //             data[0],
+        //             data[1],
+        //             data[2],
+        //             data[3],
+        //             k[i],
+        //         );
+        //     }
+        //     i_stream_id = i + 1;
+        //     i_pak_tag = i + 2;
+        //     i_size_0 = i + 3;
+        //     i_size_1 = i + 4
+        // } else if i == i_stream_id {
+        //     println!(
+        //         "{:#03}     {:#04X} {:#04X} {:#04X} {:#04X} | K {:04b} | stream id",
+        //         i + 1,
+        //         data[0],
+        //         data[1],
+        //         data[2],
+        //         data[3],
+        //         k[i],
+        //     );
+        // } else if i == i_pak_tag {
+        //     println!(
+        //         "{:#03}     {:#04X} {:#04X} {:#04X} {:#04X} | K {:04b} | packet tag",
+        //         i + 1,
+        //         data[0],
+        //         data[1],
+        //         data[2],
+        //         data[3],
+        //         k[i],
+        //     );
+        // } else if i == i_size_0 {
+        //     println!(
+        //         "{:#03}     {:#04X} {:#04X} {:#04X} {:#04X} | K {:04b} | DsizeP[15:8]",
+        //         i + 1,
+        //         data[0],
+        //         data[1],
+        //         data[2],
+        //         data[3],
+        //         k[i],
+        //     );
+        // } else if i == i_size_1 {
+        //     println!(
+        //         "{:#03}     {:#04X} {:#04X} {:#04X} {:#04X} | K {:04b} | DsizeP[7:0]",
+        //         i + 1,
+        //         data[0],
+        //         data[1],
+        //         data[2],
+        //         data[3],
+        //         k[i],
+        //     );
+        // } else {
+        //     if err[i] == 1 {
+        //         println!(
+        //             "{:#03}     {:#04X} {:#04X} {:#04X} {:#04X} | K {:04b} | crc error",
+        //             i + 1,
+        //             data[0],
+        //             data[1],
+        //             data[2],
+        //             data[3],
+        //             k[i],
+        //         );
+        //     } else {
+        //         println!(
+        //             "{:#03}     {:#04X} {:#04X} {:#04X} {:#04X} | K {:04b} |",
+        //             i + 1,
+        //             data[0],
+        //             data[1],
+        //             data[2],
+        //             data[3],
+        //             k[i],
+        //         );
+        //     }
+        if err[i] == 1 {
+            println!(
+                "{:#03}     {:#04X} {:#04X} {:#04X} {:#04X} | K {:04b} | crc error",
+                i + 1,
+                data[0],
+                data[1],
+                data[2],
+                data[3],
+                k[i],
+            );
+        } else {
+            println!(
+                "{:#03}     {:#04X} {:#04X} {:#04X} {:#04X} | K {:04b} |",
+                i + 1,
+                data[0],
+                data[1],
+                data[2],
+                data[3],
+                k[i],
+            );
+        };
+    }
+    println!("]");
+    println!("============================================");
+}
diff --git a/src/libksupport/src/kernel/api.rs b/src/libksupport/src/kernel/api.rs
index ef77e43..2c58c57 100644
--- a/src/libksupport/src/kernel/api.rs
+++ b/src/libksupport/src/kernel/api.rs
@@ -11,6 +11,8 @@ use super::{cache,
             core1::rtio_get_destination_status,
             dma, linalg,
             rpc::{rpc_recv, rpc_send, rpc_send_async}};
+#[cfg(has_cxp_phys)]
+use crate::cxp;
 use crate::{eh_artiq, i2c, rtio};
 
 extern "C" {
@@ -126,6 +128,22 @@ pub fn resolve(required: &[u8]) -> Option<u32> {
         #[cfg(has_drtio)]
         api!(subkernel_await_message = subkernel::await_message),
 
+        // CoaXPress
+        #[cfg(has_cxp_phys)]
+        api!(cxp_read_words = cxp::cxp_read_words),
+        #[cfg(has_cxp_phys)]
+        api!(cxp_readu32 = cxp::cxp_readu32),
+        #[cfg(has_cxp_phys)]
+        api!(cxp_readu64 = cxp::cxp_readu64),
+        #[cfg(has_cxp_phys)]
+        api!(cxp_writeu32 = cxp::cxp_writeu32),
+        #[cfg(has_cxp_phys)]
+        api!(cxp_writeu64 = cxp::cxp_writeu64),
+        #[cfg(has_cxp_phys)]
+        api!(cxp_setup = cxp::cxp_setup),
+        #[cfg(has_cxp_phys)]
+        api!(cxp_debug_frame_print = cxp::cxp_debug_frame_print),
+
         // Double-precision floating-point arithmetic helper functions
         // RTABI chapter 4.1.2, Table 2
         api!(__aeabi_dadd),
diff --git a/src/libksupport/src/lib.rs b/src/libksupport/src/lib.rs
index 630f19e..a243d01 100644
--- a/src/libksupport/src/lib.rs
+++ b/src/libksupport/src/lib.rs
@@ -35,6 +35,8 @@ pub mod rtio;
 #[path = "../../../build/pl.rs"]
 pub mod pl;
 
+#[cfg(has_cxp_phys)]
+pub mod cxp;
 
 #[derive(Debug, Clone)]
 pub struct RPCException {