Merge pull request #9510 from Josar/pr/at86rf2xx_rssi

at86rf2xx: correct rssi

drivers/at86rf2xx/at86rf2xx_netdev.c

@@ -166,18 +166,39 @@ static int _recv(netdev_t *netdev, void *buf, size_t len, void *info)
     at86rf2xx_fb_read(dev, tmp, 2);
     (void)tmp;
 
+    /* at86rf212  RSSI_BASE_VAL +3.1*RSSI, base varies for diff. modulation and datarates
+     * at86RF232  RSSI_BASE_VAL +3.0*RSSI, base -91dBm
+     * at86RF233  RSSI_BASE_VAL +3.0*RSSI, base -94dBm
+     * at86RF231  RSSI_BASE_VAL +3.0*(RSSI-1), base -91dBm
+     * at***RFR2  RSSI_BASE_VAL +3.0*(RSSI-1), base -90dBm
+     *
+     * AT86RF231 MAN. p.89 8.3.2 Reading RSSI
+     * AT86RF232 MAN. p.88 8.3.2 Reading RSSI
+     * AT86RF233 MAN. p.99 8.4.2 Reading RSSI
+     * "It is not recommended reading the RSSI value when using the Extended
+     * Operating Modes, use ED instead"
+     * at86RF231  RSSI_BASE_VAL +ED, base -90dBm
+     * at86RF232  RSSI_BASE_VAL +ED, base -91dBm
+     * at86RF233  RSSI_BASE_VAL +ED, base -94dBm
+     * at***RFR2  RSSI_BASE_VAL +ED, base -90dBm
+     */
     if (info != NULL) {
         uint8_t rssi = 0;
         netdev_ieee802154_rx_info_t *radio_info = info;
+
+#if defined(MODULE_AT86RF231) || defined(MODULE_AT86RF232) || defined(MODULE_AT86RF233)
         at86rf2xx_fb_read(dev, &(radio_info->lqi), 1);
-#ifndef MODULE_AT86RF231
-        at86rf2xx_fb_read(dev, &(rssi), 1);
         at86rf2xx_fb_stop(dev);
+        rssi = at86rf2xx_reg_read(dev, AT86RF2XX_REG__PHY_ED_LEVEL);
 #else
+        at86rf2xx_fb_read(dev, &(radio_info->lqi), 1);
+        at86rf2xx_fb_read(dev, &(rssi), 1);
         at86rf2xx_fb_stop(dev);
-        rssi = at86rf2xx_reg_read(dev, AT86RF2XX_REG__PHY_ED_LEVEL);
+        rssi = 3 * rssi;
 #endif
         radio_info->rssi = RSSI_BASE_VAL + rssi;
+        DEBUG("[at86rf2xx] LQI:%d high is good, RSSI:%d high is either good or"
+              "too much interference.\n", radio_info->lqi, radio_info->rssi);
     }
     else {
         at86rf2xx_fb_stop(dev);