drivers/cc2538_rf: disable RX detection during CCA

RIOT-OS · Aug 9, 2021 · 3fce21a · 3fce21a
1 parent 39d27c2
commit 3fce21a
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Showing 2 changed files with 6 additions and 0 deletions.
diff --git a/cpu/cc2538/include/cc2538_rf.h b/cpu/cc2538/include/cc2538_rf.h
@@ -110,6 +110,8 @@ extern "C" {
 #define CC2538_STATE_SFD_WAIT_RANGE_MAX  (0x06U)  /**< max range value of SFD wait state */
 #define CC2538_FRMCTRL1_PENDING_OR_MASK  (0x04)   /**< mask for enabling or disabling the
                                                        frame pending bit */
+#define CC2538_FRMCTRL0_RX_MODE_DIS      (0xC)    /**< mask for disabling RX Chain during
+                                                       CCA */
 
 #define RFCORE_ASSERT(expr) (void)( (expr) || RFCORE_ASSERT_failure(#expr, __FUNCTION__, __LINE__) )
 

diff --git a/cpu/cc2538/radio/cc2538_rf_radio_ops.c b/cpu/cc2538/radio/cc2538_rf_radio_ops.c
@@ -104,6 +104,8 @@ static int _request_transmit(ieee802154_dev_t *dev)
     else {
         cc2538_cca = false;
 
+        /* Disable RX Chain for CCA (see CC2538 RM, Section 29.9.5.3) */
+        RFCORE_XREG_FRMCTRL0 |= CC2538_FRMCTRL0_RX_MODE_DIS;
         RFCORE_SFR_RFST = ISRXON;
         /* Clear last program */
         RFCORE_SFR_RFST = ISCLEAR;
@@ -314,6 +316,8 @@ static int _request_set_trx_state(ieee802154_dev_t *dev, ieee802154_trx_state_t
         case IEEE802154_TRX_STATE_RX_ON:
             RFCORE_XREG_RFIRQM0 |= RXPKTDONE;
             RFCORE_SFR_RFST = ISFLUSHRX;
+            /* Enable RX Chain */
+            RFCORE_XREG_FRMCTRL0 &= ~CC2538_FRMCTRL0_RX_MODE_DIS;
             RFCORE_SFR_RFST = ISRXON;
             break;
     }