From 9c167fc3bf1f889f2a6bbe1cef14c1ab55788671 Mon Sep 17 00:00:00 2001
From: Florian Kaltenberger <florian.kaltenberger@eurecom.fr>
Date: Fri, 18 Aug 2017 11:13:47 +0200
Subject: [PATCH] adding GPIO control for TDD to USRP
---
targets/ARCH/USRP/USERSPACE/LIB/usrp_lib.cpp | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/targets/ARCH/USRP/USERSPACE/LIB/usrp_lib.cpp b/targets/ARCH/USRP/USERSPACE/LIB/usrp_lib.cpp
index 58ccce8503..8fc177245d 100644
--- a/targets/ARCH/USRP/USERSPACE/LIB/usrp_lib.cpp
+++ b/targets/ARCH/USRP/USERSPACE/LIB/usrp_lib.cpp
@@ -277,6 +277,17 @@ static int trx_usrp_start(openair0_device *device) {
usrp_state_t *s = (usrp_state_t*)device->priv;
+
+ // setup GPIO for TDD, GPIO(4) = ATR_RX
+ //set data direction register (DDR) to output
+ s->usrp->set_gpio_attr("FP0", "DDR", 0x1f, 0x1f);
+
+ //set control register to ATR
+ s->usrp->set_gpio_attr("FP0", "CTRL", 0x1f,0x1f);
+
+ //set ATR register
+ s->usrp->set_gpio_attr("FP0", "ATR_RX", 1<<4, 0x1f);
+
// init recv and send streaming
uhd::stream_cmd_t cmd(uhd::stream_cmd_t::STREAM_MODE_START_CONTINUOUS);
// should be s->usrp->get_time_next_pps(&cmd.time_spec);
--
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