diff --git a/openair1/PHY/CODING/nrLDPC_decoder/nrLDPC_tools/cnProc_gen.c b/openair1/PHY/CODING/nrLDPC_decoder/nrLDPC_tools/cnProc_gen.c
index 31c907d8e9..632827b871 100644
--- a/openair1/PHY/CODING/nrLDPC_decoder/nrLDPC_tools/cnProc_gen.c
+++ b/openair1/PHY/CODING/nrLDPC_decoder/nrLDPC_tools/cnProc_gen.c
@@ -9,12 +9,17 @@
 #include "../nrLDPC_bnProc.h"
 #include "cnProc_gen.h"
 
-void nrLDPC_cnProc_BG1(t_nrLDPC_lut* p_lut, t_nrLDPC_procBuf* p_procBuf, uint16_t Z)
+void nrLDPC_cnProc_BG1_generator(t_nrLDPC_procBuf* p_procBuf, uint16_t Z,int R)
 {
     printf("void nrLDPC_cnProc_BG1_Z%d\n",Z);
 
-    const uint8_t*  lut_numCnInCnGroups   = p_lut->numCnInCnGroups;
-    const uint32_t* lut_startAddrCnGroups = p_lut->startAddrCnGroups;
+    const uint8_t*  lut_numCnInCnGroups;
+    const uint32_t* lut_startAddrCnGroups = lut_startAddrCnGroups_BG1;
+
+    if (R==0)      lut_numCnInCnGroups = lut_numCnInCnGroups_BG1_R13;
+    else if (R==1) lut_numCnInCnGroups = lut_numCnInCnGroups_BG1_R23;
+    else if (R==2) lut_numCnInCnGroups = lut_numCnInCnGroups_BG1_R89;
+    else { printf("aborting, illegal R %d\n",R); abort();}
 
     int8_t* cnProcBuf    = p_procBuf->cnProcBuf;
     int8_t* cnProcBufRes = p_procBuf->cnProcBufRes;
diff --git a/openair1/PHY/CODING/nrLDPC_decoder/nrLDPC_tools/main.c b/openair1/PHY/CODING/nrLDPC_decoder/nrLDPC_tools/main.c
index 45b79ffa52..35b78963b6 100644
--- a/openair1/PHY/CODING/nrLDPC_decoder/nrLDPC_tools/main.c
+++ b/openair1/PHY/CODING/nrLDPC_decoder/nrLDPC_tools/main.c
@@ -59,12 +59,12 @@ int main(int argc, char *argv[])
   t_nrLDPC_procBuf* p_procBuf = &cnProcBuf;
 
 //  load_nrLDPClib();
-    t_nrLDPC_lut lut_numCnInCnGroups;
-    t_nrLDPC_lut* p_lut = &lut_numCnInCnGroups;
+
 
 //  load_nrLDPClib_ref("_orig", &encoder_orig);
 
-    nrLDPC_cnProc_BG1(p_lut,p_procBuf,384);
+  // Z=384, R=1/3
+  nrLDPC_cnProc_BG1_generator(p_procBuf,384,0);
 	//nrLDPC_cnProc_BG1(&lut_numCnInCnGroups, &cnProcBuf, 380);
   //for (block_length=8;block_length<=MAX_BLOCK_LENGTH;block_length+=8)