\doxysection{RACH channel coding}
\label{group__rach}\index{RACH channel coding@{RACH channel coding}}
\doxysubsection*{Files}
\begin{DoxyCompactItemize}
\item 
file \textbf{ rach.\+h}
\begin{DoxyCompactList}\small\item\em Osmocom GMR-\/1 RACH channel coding header. \end{DoxyCompactList}\item 
file \textbf{ rach.\+c}
\begin{DoxyCompactList}\small\item\em Osmocom GMR-\/1 RACH channel coding implementation. \end{DoxyCompactList}\end{DoxyCompactItemize}
\doxysubsection*{Functions}
\begin{DoxyCompactItemize}
\item 
void \textbf{ gmr1\+\_\+rach\+\_\+encode} (\textbf{ ubit\+\_\+t} $\ast$bits\+\_\+e, const uint8\+\_\+t $\ast$rach, uint8\+\_\+t sb\+\_\+mask)
\begin{DoxyCompactList}\small\item\em Stateless GMR-\/1 RACH channel coder. \end{DoxyCompactList}\item 
int \textbf{ gmr1\+\_\+rach\+\_\+decode} (uint8\+\_\+t $\ast$rach, const \textbf{ sbit\+\_\+t} $\ast$bits\+\_\+e, uint8\+\_\+t sb\+\_\+mask, int $\ast$conv\+\_\+rv, int $\ast$crc\+\_\+rv)
\begin{DoxyCompactList}\small\item\em Stateless GMR-\/1 RACH channel decoder. \end{DoxyCompactList}\end{DoxyCompactItemize}


\doxysubsection{Detailed Description}


\doxysubsection{Function Documentation}
\mbox{\label{group__rach_ga4e3f0c261d715b618e188dd5d2a14391}} 
\index{RACH channel coding@{RACH channel coding}!gmr1\_rach\_decode@{gmr1\_rach\_decode}}
\index{gmr1\_rach\_decode@{gmr1\_rach\_decode}!RACH channel coding@{RACH channel coding}}
\doxysubsubsection{gmr1\_rach\_decode()}
{\footnotesize\ttfamily int gmr1\+\_\+rach\+\_\+decode (\begin{DoxyParamCaption}\item[{uint8\+\_\+t $\ast$}]{rach,  }\item[{const \textbf{ sbit\+\_\+t} $\ast$}]{bits\+\_\+e,  }\item[{uint8\+\_\+t}]{sb\+\_\+mask,  }\item[{int $\ast$}]{conv\+\_\+rv,  }\item[{int $\ast$}]{crc\+\_\+rv }\end{DoxyParamCaption})}



Stateless GMR-\/1 RACH channel decoder. 


\begin{DoxyParams}[1]{Parameters}
\mbox{\texttt{ out}}  & {\em rach} & RACH packet data (2 class-\/1 bytes, 16 class-\/2 bytes) \\
\hline
\mbox{\texttt{ in}}  & {\em bits\+\_\+e} & Data bits of a burst \\
\hline
\mbox{\texttt{ in}}  & {\em sb\+\_\+mask} & RACH SB Mask value (see GMR-\/1 04.\+008) \\
\hline
\mbox{\texttt{ out}}  & {\em conv\+\_\+rv} & Return of the convolutional decode (can be NULL) \\
\hline
\mbox{\texttt{ out}}  & {\em crc\+\_\+rv} & Return array of the 2 CRC checks (can be NULL) \\
\hline
\end{DoxyParams}
\begin{DoxyReturn}{Returns}
0 if all CRC check pass, any other value for fail.
\end{DoxyReturn}
RACH data is 18 bytes long (2 class-\/1, 16 class-\/2), and bits\+\_\+e is a 494 soft bits array unmapped from a RACH burst. 

References \textbf{ gmr1\+\_\+deinterleave\+\_\+intra()}, \textbf{ gmr1\+\_\+scramble\+\_\+sbit()}, and \textbf{ osmo\+\_\+conv\+\_\+decode()}.

\mbox{\label{group__rach_gaa55acd1e1d248c2b34a97af389c69e90}} 
\index{RACH channel coding@{RACH channel coding}!gmr1\_rach\_encode@{gmr1\_rach\_encode}}
\index{gmr1\_rach\_encode@{gmr1\_rach\_encode}!RACH channel coding@{RACH channel coding}}
\doxysubsubsection{gmr1\_rach\_encode()}
{\footnotesize\ttfamily void gmr1\+\_\+rach\+\_\+encode (\begin{DoxyParamCaption}\item[{\textbf{ ubit\+\_\+t} $\ast$}]{bits\+\_\+e,  }\item[{const uint8\+\_\+t $\ast$}]{rach,  }\item[{uint8\+\_\+t}]{sb\+\_\+mask }\end{DoxyParamCaption})}



Stateless GMR-\/1 RACH channel coder. 


\begin{DoxyParams}[1]{Parameters}
\mbox{\texttt{ out}}  & {\em bits\+\_\+e} & Data bits of a burst \\
\hline
\mbox{\texttt{ in}}  & {\em rach} & RACH packet data (2 class-\/1 bytes, 16 class-\/2 bytes) \\
\hline
\mbox{\texttt{ in}}  & {\em sb\+\_\+mask} & RACH SB Mask value (see GMR-\/1 04.\+008)\\
\hline
\end{DoxyParams}
RACH data is 18 bytes long (2 class-\/1, 16 class-\/2), and bits\+\_\+e is a 494 hard bits array to be mapped on a RACH burst. 

References \textbf{ gmr1\+\_\+crc12}, \textbf{ gmr1\+\_\+crc8}, \textbf{ osmo\+\_\+conv\+\_\+encode()}, \textbf{ osmo\+\_\+crc16gen\+\_\+set\+\_\+bits()}, \textbf{ osmo\+\_\+crc8gen\+\_\+set\+\_\+bits()}, and \textbf{ osmo\+\_\+pbit2ubit\+\_\+ext()}.