adding GPIO control for TDD to USRP

2017-08-18 11:13:47 +02:00
parent d7096758aa
commit 9c167fc3bf
1 changed files with 11 additions and 0 deletions
@@ -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);