From 01d85c733bd3220e6a44e5a9c132172462f85ef7 Mon Sep 17 00:00:00 2001
From: Josh Blum <josh@joshknows.com>
Date: Mon, 6 Jun 2011 04:09:13 +0100
Subject: usrp-e100: added check for wishbone readback and clock recovery

---
 host/lib/usrp/usrp_e100/fpga_downloader.cpp | 12 ++++----
 host/lib/usrp/usrp_e100/usrp_e100_impl.cpp  | 44 +++++++++++++++++++++--------
 host/lib/usrp/usrp_e100/usrp_e100_impl.hpp  |  2 +-
 3 files changed, 39 insertions(+), 19 deletions(-)

(limited to 'host/lib/usrp')

diff --git a/host/lib/usrp/usrp_e100/fpga_downloader.cpp b/host/lib/usrp/usrp_e100/fpga_downloader.cpp
index a7449d3b1..b8420796f 100644
--- a/host/lib/usrp/usrp_e100/fpga_downloader.cpp
+++ b/host/lib/usrp/usrp_e100/fpga_downloader.cpp
@@ -254,9 +254,9 @@ void usrp_e100_load_fpga(const std::string &bin_file){
 
 	UHD_MSG(status) << "Loading FPGA image: " << bin_file << "... " << std::flush;
 
-	if(std::system("/sbin/rmmod usrp_e") != 0){
-		UHD_MSG(warning) << "USRP-E100 FPGA downloader: could not unload usrp_e module" << std::endl;
-	}
+//	if(std::system("/sbin/rmmod usrp_e") != 0){
+//		UHD_MSG(warning) << "USRP-E100 FPGA downloader: could not unload usrp_e module" << std::endl;
+//	}
 
 	prepare_fpga_for_configuration(gpio_prog_b, gpio_init_b);
 
@@ -264,9 +264,9 @@ void usrp_e100_load_fpga(const std::string &bin_file){
 
 	send_file_to_fpga(bin_file, gpio_init_b, gpio_done);
 
-	if(std::system("/sbin/modprobe usrp_e") != 0){
-		UHD_MSG(warning) << "USRP-E100 FPGA downloader: could not load usrp_e module" << std::endl;
-	}
+//	if(std::system("/sbin/modprobe usrp_e") != 0){
+//		UHD_MSG(warning) << "USRP-E100 FPGA downloader: could not load usrp_e module" << std::endl;
+//	}
 
 }
 
diff --git a/host/lib/usrp/usrp_e100/usrp_e100_impl.cpp b/host/lib/usrp/usrp_e100/usrp_e100_impl.cpp
index e9e9b6e20..893e1eb45 100644
--- a/host/lib/usrp/usrp_e100/usrp_e100_impl.cpp
+++ b/host/lib/usrp/usrp_e100/usrp_e100_impl.cpp
@@ -93,7 +93,7 @@ static device::sptr usrp_e100_make(const device_addr_t &device_addr){
     usrp_e100_iface::sptr iface = usrp_e100_iface::make(node);
 
     //extract the fpga path for usrp-e
-    std::string usrp_e100_fpga_image = find_image_path(device_addr.get("fpga", "usrp_e100_fpga.bin"));
+    std::string usrp_e100_fpga_image = find_image_path(device_addr.get("fpga", "usrp_e100_fpga_m2.bin"));
 
     //compute a hash of the fpga file
     const boost::uint32_t file_hash = boost::uint32_t(hash_fpga_file(usrp_e100_fpga_image));
@@ -105,21 +105,41 @@ static device::sptr usrp_e100_make(const device_addr_t &device_addr){
     if (iface->peek32(UE_REG_RB_MISC_TEST32) != file_hash){
         iface.reset();
         usrp_e100_load_fpga(usrp_e100_fpga_image);
-        sleep(1); ///\todo do this better one day.
         UHD_MSG(status) << boost::format("re-Opening USRP-E on %s") % node << std::endl;
         iface = usrp_e100_iface::make(node);
     }
 
-    //store the hash into the FPGA register
-    iface->poke32(UE_REG_SR_MISC_TEST32, file_hash);
-
-    //check that the hash can be readback correctly
-    if (iface->peek32(UE_REG_RB_MISC_TEST32) != file_hash){
-        UHD_MSG(error) << boost::format(
-            "The FPGA hash readback failed!\n"
-            "The FPGA is either clocked improperly\n"
-            "or the FPGA build is not compatible.\n"
-        );
+    //Perform wishbone readback tests:
+    //If the tests fail, try to re-initialize the clock.
+    //If the tests fail again, we just continue...
+    for (size_t phase = 0; phase <= 1; phase++){
+        bool test_fail = false;
+        UHD_MSG(status) << "Performing wishbone readback test... " << std::flush;
+        for (size_t i = 0; i < 100; i++){
+            iface->poke32(UE_REG_SR_MISC_TEST32, file_hash);
+            test_fail = iface->peek32(UE_REG_RB_MISC_TEST32) != file_hash;
+            if (test_fail) break; //exit loop on any failure
+        }
+        UHD_MSG(status) << ((test_fail)? " fail" : "pass") << std::endl;
+
+        if (not test_fail) break; //no more tests, its good
+
+        switch (phase){
+        case 0:
+            UHD_MSG(warning) << boost::format(
+                "The FPGA may be clocked improperly.\n"
+                "Attempting to re-initialize the clock...\n"
+            );
+            usrp_e100_clock_ctrl::make(iface, 64e6);
+            break;
+
+        case 1:
+            UHD_MSG(error) << boost::format(
+                "The FPGA is either clocked improperly\n"
+                "or the FPGA build is not compatible.\n"
+            );
+            break;
+        }
     }
 
     //check that the compatibility is correct
diff --git a/host/lib/usrp/usrp_e100/usrp_e100_impl.hpp b/host/lib/usrp/usrp_e100/usrp_e100_impl.hpp
index 318a75191..84703f828 100644
--- a/host/lib/usrp/usrp_e100/usrp_e100_impl.hpp
+++ b/host/lib/usrp/usrp_e100/usrp_e100_impl.hpp
@@ -33,7 +33,7 @@
 
 uhd::transport::zero_copy_if::sptr usrp_e100_make_mmap_zero_copy(usrp_e100_iface::sptr iface);
 
-static const boost::uint16_t USRP_E_FPGA_COMPAT_NUM = 0x04;
+static const boost::uint16_t USRP_E_FPGA_COMPAT_NUM = 0x05;
 
 //! load an fpga image from a bin file into the usrp-e fpga
 extern void usrp_e100_load_fpga(const std::string &bin_file);
-- 
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