[patch] STB0899 signal strength fix (vdr 1.7.28)

mtron · 5. Juni 2012

da der Thread [Tester gesucht] Verbessertes DVB-S Tuning mit STB0899 Satkarten leider geschlossen wurde muss ich hier ein neues Thema erstellen.

Auf der vdr mailing liste ist ein neuer patch bezüglich der falsch dargestellten Signalstärke bei den STB0899 chips gepostet worden: http://www.spinics.net/lists/vdr/msg26242.html

Diff

--- dvbdevice.c.orig
+++ dvbdevice.c
@@ -560,6 +560,12 @@ int cDvbTuner::GetSignalStrength(void) c
   switch (subsystemId) {
     case 0x13C21019: MaxSignal = 670; break; // TT-budget S2-3200 (DVB-S/DVB-S2)
     }
+#if 1
+  // XXX This is likely not correct for all cards using stb0899
+  // but pctv452e usb ones seem to be affected too...
+  if (!strcmp(device->DeviceName(), "STB0899 Multistandard"))
+    MaxSignal = 670;
+#endif
   int s = int(Signal) * 100 / MaxSignal;
   if (s > 100)
      s = 100;
@@ -632,6 +638,12 @@ int cDvbTuner::GetSignalQuality(void) co
      switch (subsystemId) {
        case 0x13C21019: MaxSnr = 200; break; // TT-budget S2-3200 (DVB-S/DVB-S2)
        }
+#if 1
+     // XXX This is likely not correct for all cards using stb0899
+     // but pctv452e usb ones seem to be affected too...
+     if (!strcmp(device->DeviceName(), "STB0899 Multistandard"))
+       MaxSnr = 200;
+#endif
      int a = int(Snr) * 100 / MaxSnr;
      int b = 100 - (Unc * 10 + (Ber / 256) * 5);
      if (b < 0)

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dieser Patch funktioniert auch für die Terratec Cinergy S2 PCI mit den mantis treibern eines aktuellen media_build. Getestet mit vdr 1.7.28 (ST TNG OSD Skin & aktuellem softhddevice git)

Code

00:0b.0 Multimedia controller: Twinhan Technology Co. Ltd Mantis DTV PCI Bridge Controller [Ver 1.0] (rev 01)
	Subsystem: TERRATEC Electronic GmbH Device 1179
	Flags: bus master, medium devsel, latency 128, IRQ 19
	Memory at e0000000 (32-bit, prefetchable) [size=4K]
	Kernel driver in use: Mantis
	Kernel modules: mantis

Danke an die Beteiligten!

penix · 6. September 2012

i use this one

Diff

--- /common/Programms/ver2/src/s2-liplianin/linux/drivers/media/dvb/frontends/stb0899_drv.c	2009-12-31 17:15:38.115203347 +0300
+++ ./linux/drivers/media/dvb/frontends/stb0899_drv.c	2010-01-14 22:17:22.671634551 +0300
@@ -980,6 +980,16 @@
 
 				*strength = stb0899_table_lookup(stb0899_dvbsrf_tab, ARRAY_SIZE(stb0899_dvbsrf_tab) - 1, val);
 				*strength += 750;
+            	
+            	const int MIN_STRENGTH_DVBS = 0;
+            	const int MAX_STRENGTH_DVBS = 680;
+            	if (*strength < MIN_STRENGTH_DVBS) 	
+                	*strength = 0;
+            	else if(*strength > MAX_STRENGTH_DVBS) 
+                	*strength = 0xFFFF;
+            	else
+			    	*strength = (*strength - MIN_STRENGTH_DVBS) * 0xFFFF / (MAX_STRENGTH_DVBS - MIN_STRENGTH_DVBS); 
+
 				dprintk(state->verbose, FE_DEBUG, 1, "AGCIQVALUE = 0x%02x, C = %d * 0.1 dBm",
 					val & 0xff, *strength);
 			}
@@ -992,6 +1002,7 @@
 
 			*strength = stb0899_table_lookup(stb0899_dvbs2rf_tab, ARRAY_SIZE(stb0899_dvbs2rf_tab) - 1, val);
 			*strength += 750;
+			*strength = *strength << 4;
 			dprintk(state->verbose, FE_DEBUG, 1, "IF_AGC_GAIN = 0x%04x, C = %d * 0.1 dBm",
 				val & 0x3fff, *strength);
 		}
@@ -1024,6 +1035,16 @@
 				val = MAKEWORD16(buf[0], buf[1]);
 
 				*snr = stb0899_table_lookup(stb0899_cn_tab, ARRAY_SIZE(stb0899_cn_tab) - 1, val);
+
+            	const int MIN_SNR_DVBS = 0;
+            	const int MAX_SNR_DVBS = 200;
+            	if (*snr < MIN_SNR_DVBS) 	
+                	*snr = 0;
+            	else if(*snr > MAX_SNR_DVBS) 
+                	*snr = 0xFFFF;
+            	else
+			    	*snr = (*snr - MIN_SNR_DVBS) * 0xFFFF / (MAX_SNR_DVBS - MIN_SNR_DVBS); 
+
 				dprintk(state->verbose, FE_DEBUG, 1, "NIR = 0x%02x%02x = %u, C/N = %d * 0.1 dBm\n",
 					buf[0], buf[1], val, *snr);
 			}
@@ -1048,6 +1069,16 @@
 				val = (quantn - estn) / 10;
 			}
 			*snr = val;
+
+        	const int MIN_SNR_DVBS2 = 10;
+        	const int MAX_SNR_DVBS2 = 70;
+        	if (*snr < MIN_SNR_DVBS2) 	
+            	*snr = 0;
+        	else if(*snr > MAX_SNR_DVBS2) 
+            	*snr = 0xFFFF;
+        	else
+				*snr = (*snr - MIN_SNR_DVBS2) * 0xFFFF / (MAX_SNR_DVBS2 - MIN_SNR_DVBS2); 
+
 			dprintk(state->verbose, FE_DEBUG, 1, "Es/N0 quant = %d (%d) estimate = %u (%d), C/N = %d * 0.1 dBm",
 				quant, quantn, est, estn, val);
 		}

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[patch] STB0899 signal strength fix (vdr 1.7.28)

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