From 87f69e9784d269fffbaa430726b4d31659034ae6 Mon Sep 17 00:00:00 2001
From: Josh Blum <josh@joshknows.com>
Date: Sun, 28 Aug 2011 21:36:47 +0000
Subject: e100: add FIFO clear and kernel clear to loopback

---
 host/usrp_e_utils/usrp-e-loopback.cpp | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'host/usrp_e_utils/usrp-e-loopback.cpp')

diff --git a/host/usrp_e_utils/usrp-e-loopback.cpp b/host/usrp_e_utils/usrp-e-loopback.cpp
index 5b1003440..6b5ebd55f 100644
--- a/host/usrp_e_utils/usrp-e-loopback.cpp
+++ b/host/usrp_e_utils/usrp-e-loopback.cpp
@@ -259,6 +259,15 @@ int main(int argc, char *argv[]){
     //set the mode to loopback
     poke16(E100_REG_MISC_XFER_RATE, (1<<8) | (1<<9));
 
+    //clear FIFO state in FPGA and kernel
+    poke32(E100_REG_CLEAR_RX, 0);
+    poke32(E100_REG_CLEAR_TX, 0);
+    ::close(fp);
+    if ((fp = ::open("/dev/usrp_e0", O_RDWR)) < 0){
+        std::cerr << "Open failed" << std::endl;
+        return -1;
+    }
+
     //setup the ring buffer
     setup_ring();
 
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