nimble/dtm: Disable whitening for testing

X-Original-Commit: 1aaf512484cd6986700a35b55783a7fef7a0c976

nimble/controller/src/ble_ll_dtm.c

@@ -298,6 +298,8 @@ schedule:
     rc = ble_ll_sched_dtm(sch);
     assert(rc == 0);
 
+    ble_phy_enable_dtm();
+
     g_ble_ll_dtm_ctx.active = 1;
     return 0;
 }
@@ -336,6 +338,8 @@ ble_ll_dtm_rx_create_ctx(uint8_t rf_channel, uint8_t phy_mode)
         return 1;
     }
 
+    ble_phy_enable_dtm();
+
     return 0;
 }
 
@@ -352,6 +356,7 @@ ble_ll_dtm_ctx_free(struct dtm_ctx * ctx)
     OS_EXIT_CRITICAL(sr);
 
     ble_phy_disable();
+    ble_phy_disable_dtm();
     ble_ll_state_set(BLE_LL_STATE_STANDBY);
 #ifdef BLE_XCVR_RFCLK
     ble_ll_xcvr_rfclk_stop();

nimble/drivers/nrf52/src/ble_phy.c

@@ -1800,7 +1800,9 @@ ble_phy_resolv_list_disable(void)
 #if MYNEWT_VAL(BLE_LL_DIRECT_TEST_MODE) == 1
 void ble_phy_enable_dtm(void)
 {
-    /* Disable whitening as per Bluetooth v5.0 Vol 6. Part F. 4.1.1*/
+    /* When DTM is enabled we need to disable whitening as per
+     * Bluetooth v5.0 Vol 6. Part F. 4.1.1
+     */
     NRF_RADIO->PCNF1 &= ~RADIO_PCNF1_WHITEEN_Msk;
 }