fix SNR calculation

daq-tools · Oct 1, 2019 · 918f20d · 918f20d
1 parent 19fc2fc
commit 918f20d
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/SX127x/LoRa.py b/SX127x/LoRa.py
@@ -489,7 +489,7 @@ def get_modem_status(self):
 
     def get_pkt_snr_value(self):
         v = self.spi.xfer([REG.LORA.PKT_SNR_VALUE, 0])[1]
-        return float(256-v) / 4.
+        return (float(v-256) if v > 127 else float(v)) / 4.
 
     def get_pkt_rssi_value(self):
         v = self.spi.xfer([REG.LORA.PKT_RSSI_VALUE, 0])[1]