From 55295b31a7e2765d934d238e9530342a7ffec602 Mon Sep 17 00:00:00 2001
From: Balaji Shankaran <balaji.shankaran@radisys.com>
Date: Mon, 13 Jul 2020 12:21:53 +0530
Subject: [PATCH] To Calculate Set Bits from Msb for FreqDomain Allocation JIRA
 ID: ODUHIGH-192

Change-Id: If9c238bbd728e5cc812893302607e690b92d1554
Signed-off-by: Balaji Shankaran <balaji.shankaran@radisys.com>
---
 src/5gnrsch/sch_utils.c |  8 ++++----
 src/5gnrsch/sch_utils.h | 13 ++++++++++---
 2 files changed, 14 insertions(+), 7 deletions(-)

diff --git a/src/5gnrsch/sch_utils.c b/src/5gnrsch/sch_utils.c
index 1397c65d8..1f0035a25 100644
--- a/src/5gnrsch/sch_utils.c
+++ b/src/5gnrsch/sch_utils.c
@@ -448,7 +448,7 @@ void schAllocFreqDomRscType0(uint16_t startPrb, uint16_t prbSize, uint8_t *freqD
 {
    uint8_t remBits = prbSize; /* each bit represents 6 PRBs */
    uint8_t firstByte = 1;
-   uint8_t numBits,startBit,byteCount = 0;
+   uint8_t numBits,startBit,byteCount = 5;
 
    while(remBits)
    {
@@ -456,7 +456,7 @@ void schAllocFreqDomRscType0(uint16_t startPrb, uint16_t prbSize, uint8_t *freqD
       if(startPrb/8)
       {
          startPrb -= 8;
-         byteCount++;
+         byteCount--;
          continue;
       }
 
@@ -477,12 +477,12 @@ void schAllocFreqDomRscType0(uint16_t startPrb, uint16_t prbSize, uint8_t *freqD
          numBits = 8 - startBit;
 
       /* bit operation to set the bits */
-		SET_BITS((startBit % 8),numBits,freqDomain[byteCount])
+		SET_BITS_MSB((startBit % 8),numBits,freqDomain[byteCount])
       firstByte = 0;
 
       /* the ramaining bits should be subtracted with the numBits set in this byte */
       remBits -= numBits;
-      byteCount++;
+      byteCount--;
    }
 }
 
diff --git a/src/5gnrsch/sch_utils.h b/src/5gnrsch/sch_utils.h
index b4a3acb88..ec7d0e0d2 100644
--- a/src/5gnrsch/sch_utils.h
+++ b/src/5gnrsch/sch_utils.h
@@ -25,9 +25,16 @@
 #define MAX_PRACH_CONFIG_IDX   256
 #define MAX_MU_PUSCH           4
 #define TOTAL_TBSIZE_VALUES    93
-#define SET_BITS(_startBit, _numBits, _byte)                                \
-{                                                            \
-   _byte = (((~((~0)<<_numBits))<<_startBit));               \
+#define SET_BITS_MSB(_startBit, _numBits, _byte) \
+{                                                \
+   _byte = (~((0xFF) >> _numBits));              \
+	_byte >>= _startBit;                          \
+}
+
+#define SET_BITS_LSB(_startBit, _numBits, _byte) \
+{                                                \
+   _byte = (~((0xFF) << _numBits));              \
+	_byte <<= _startBit;                          \
 }
 
 /* functions declarations */
-- 
2.16.6