usrp2: work on mtu discovery

added echo routine to the firmware and discovery routine to host

the implementation is integrated into the factory function and appears to work on linux

1 files changed, 6 insertions, 0 deletions

diff --git a/host/lib/usrp/usrp2/fw_common.h b/host/lib/usrp/usrp2/fw_common.h
index 6eb047454..68c49cafc 100644
--- a/host/lib/usrp/usrp2/fw_common.h
+++ b/host/lib/usrp/usrp2/fw_common.h
@@ -89,6 +89,9 @@ typedef enum{
     USRP2_CTRL_ID_SO_LIKE_CAN_YOU_READ_THIS_UART_BRO = 'v',
     USRP2_CTRL_ID_I_HELLA_READ_THAT_UART_DUDE = 'V',
 
+    USRP2_CTRL_ID_HOLLER_AT_ME_BRO = 'l',
+    USRP2_CTRL_ID_HOLLER_BACK_DUDE = 'L',
+
     USRP2_CTRL_ID_PEACE_OUT = '~'
 
 } usrp2_ctrl_id_t;
@@ -133,6 +136,9 @@ typedef struct{
             uint8_t bytes;
             uint8_t data[20];
         } uart_args;
+        struct {
+            uint32_t len;
+        } echo_args;
     } data;
 } usrp2_ctrl_data_t;