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strawmanbobi
2017-06-10 17:57:47 +08:00
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cc26xx-example/ti/BLE-CC264x/ble_cc26xx/Components/npi/npi_rxbuf.c Normal file
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//******************************************************************************
//! \file npi_rxbuf.c
//! \brief NPI RX Buffer and utilities
//
// Revised $Date: 2015-07-28 14:31:44 -0700 (Tue, 28 Jul 2015) $
// Revision: $Revision: 44419 $
//
// Copyright 2015 Texas Instruments Incorporated. All rights reserved.
//
// IMPORTANT: Your use of this Software is limited to those specific rights
// granted under the terms of a software license agreement between the user
// who downloaded the software, his/her employer (which must be your employer)
// and Texas Instruments Incorporated (the "License"). You may not use this
// Software unless you agree to abide by the terms of the License. The License
// limits your use, and you acknowledge, that the Software may not be modified,
// copied or distributed unless used solely and exclusively in conjunction with
// a Texas Instruments radio frequency device, which is integrated into
// your product. Other than for the foregoing purpose, you may not use,
// reproduce, copy, prepare derivative works of, modify, distribute, perform,
// display or sell this Software and/or its documentation for any purpose.
//
// YOU FURTHER ACKNOWLEDGE AND AGREE THAT THE SOFTWARE AND DOCUMENTATION ARE
// PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED,l
// INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY, TITLE,
// NON-INFRINGEMENT AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL
// TEXAS INSTRUMENTS OR ITS LICENSORS BE LIABLE OR OBLIGATED UNDER CONTRACT,
// NEGLIGENCE, STRICT LIABILITY, CONTRIBUTION, BREACH OF WARRANTY, OR OTHER
// LEGAL EQUITABLE THEORY ANY DIRECT OR INDIRECT DAMAGES OR EXPENSES
// INCLUDING BUT NOT LIMITED TO ANY INCIDENTAL, SPECIAL, INDIRECT, PUNITIVE
// OR CONSEQUENTIAL DAMAGES, LOST PROFITS OR LOST DATA, COST OF PROCUREMENT
// OF SUBSTITUTE GOODS, TECHNOLOGY, SERVICES, OR ANY CLAIMS BY THIRD PARTIES
// (INCLUDING BUT NOT LIMITED TO ANY DEFENSE THEREOF), OR OTHER SIMILAR COSTS.
//
// Should you have any questions regarding your right to use this Software,
// contact Texas Instruments Incorporated at www.TI.com.
//******************************************************************************
// ****************************************************************************
// includes
// ****************************************************************************
#include <string.h>
#include <xdc/std.h>
#include "Board.h"
#include "hal_types.h"
#include "inc/npi_config.h"
#include "inc/npi_tl.h"
// ****************************************************************************
// defines
// ****************************************************************************
#define NPIRXBUF_RXHEAD_INC(x) RxBufHead += x; \
RxBufHead %= NPI_TL_BUF_SIZE;
#define NPIRXBUF_RXTAIL_INC(x) RxBufTail += x; \
RxBufTail %= NPI_TL_BUF_SIZE;
// ****************************************************************************
// typedefs
// ****************************************************************************
//*****************************************************************************
// globals
//*****************************************************************************
//Receive Buffer for all NPI messages
static uint8 RxBuf[NPI_TL_BUF_SIZE];
static uint16 RxBufHead = 0;
static uint16 RxBufTail = 0;
//*****************************************************************************
// function prototypes
//*****************************************************************************
// -----------------------------------------------------------------------------
//! \brief NPIRxBuf_Read
//!
//! \param[in] len - number of bytes to read out of circular buffer
//!
//! \return uint16 - number of bytes read
// -----------------------------------------------------------------------------
uint16 NPIRxBuf_Read(uint16 len)
{
uint16 partialLen = 0;
// Need to make two reads due to wrap around of circular buffer
if ((len + RxBufTail) > NPI_TL_BUF_SIZE)
{
partialLen = NPI_TL_BUF_SIZE - RxBufTail;
NPITL_readTL(&RxBuf[RxBufTail], partialLen);
len -= partialLen;
RxBufTail = 0;
}
// Read remainder of data from Transport Layer
NPITL_readTL(&RxBuf[RxBufTail], len);
NPIRXBUF_RXTAIL_INC(len);
// Return len to original size
len += partialLen;
return len;
}
// -----------------------------------------------------------------------------
//! \brief Returns number of bytes that are unparsed in RxBuf
//!
//! \return uint16 - number of bytes that are unparsed in RxBuf
// -----------------------------------------------------------------------------
uint16 NPIRxBuf_GetRxBufCount(void)
{
return ((RxBufTail - RxBufHead) + NPI_TL_BUF_SIZE) % NPI_TL_BUF_SIZE;
}
// -----------------------------------------------------------------------------
//! \brief Returns number of bytes that are available in RxBuf
//!
//! \return uint16 - number of bytes that are available in RxBuf
// -----------------------------------------------------------------------------
uint16 NPIRxBuf_GetRxBufAvail(void)
{
return (NPI_TL_BUF_SIZE - NPIRxBuf_GetRxBufCount());
}
// -----------------------------------------------------------------------------
//! \brief NPIRxBuf_ReadFromRxBuf
//!
//! \param[in] buf - pointer to byte array in which to copy bytes read
//! \param[in] len - number of bytes to read out of circular buffer
//!
//! \return uint16 - numjer of bytes read
// -----------------------------------------------------------------------------
uint16 NPIRxBuf_ReadFromRxBuf(uint8_t *buf, uint16 len)
{
uint16_t idx;
for (idx = 0; idx < len; idx++)
{
*buf++ = RxBuf[RxBufHead];
NPIRXBUF_RXHEAD_INC(1)
}
return len;
}