SG_BUF_CNT
currSCCB->Sccb_sgseg += (unsigned char)SG_BUF_CNT;
while ((sg_count < (unsigned char)SG_BUF_CNT) &&
sg_ptr = pCurrSCCB->Sccb_sgseg + SG_BUF_CNT;
pCurrSCCB->Sccb_sgseg += SG_BUF_CNT;