mirror of
https://github.com/gnss-sdr/gnss-sdr
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102 lines
2.4 KiB
C++
102 lines
2.4 KiB
C++
/*!
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* \file fpga_dma.h
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* \brief FPGA DMA control. This code is based in the Xilinx DMA proxy test application:
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* https://github.com/Xilinx-Wiki-Projects/software-prototypes/tree/master/linux-user-space-dma/Software
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* \author Marc Majoral, mmajoral(at)cttc.es
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*
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* -----------------------------------------------------------------------------
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*
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* GNSS-SDR is a Global Navigation Satellite System software-defined receiver.
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* This file is part of GNSS-SDR.
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*
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* Copyright (C) 2010-2022 (see AUTHORS file for a list of contributors)
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* SPDX-License-Identifier: GPL-3.0-or-later
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*
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* -----------------------------------------------------------------------------
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*/
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#ifndef GNSS_SDR_FPGA_DMA_H
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#define GNSS_SDR_FPGA_DMA_H
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#include <array> // for std::array
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#include <cstdint> // for std::int8_t
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#define BUFFER_SIZE (128 * 1024) /* must match driver exactly */
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#if INTPTR_MAX == INT64_MAX // 64-bit processor architecture
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#define TX_BUFFER_COUNT 1 /* app only, must be <= to the number in the driver */
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#define FINISH_XFER _IOW('a', 'a', int32_t *)
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#define START_XFER _IOW('a', 'b', int32_t *)
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// channel buffer structure
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struct channel_buffer
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{
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std::array<int8_t, BUFFER_SIZE> buffer;
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enum proxy_status
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{
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PROXY_NO_ERROR = 0,
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PROXY_BUSY = 1,
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PROXY_TIMEOUT = 2,
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PROXY_ERROR = 3
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} status;
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unsigned int length;
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} __attribute__((aligned(1024))); /* 64 byte alignment required for DMA, but 1024 handy for viewing memory */
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// internal DMA channel data structure
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struct channel
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{
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struct channel_buffer *buf_ptr;
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int fd;
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};
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#endif
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/*!
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* \brief Class that controls the switch DMA in the FPGA
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*/
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class Fpga_DMA
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{
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public:
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/*!
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* \brief Default constructor.
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*/
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Fpga_DMA() = default;
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/*!
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* \brief Default destructor.
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*/
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~Fpga_DMA() = default;
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/*!
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* \brief Open the DMA device driver.
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*/
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int DMA_open(void);
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/*!
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* \brief Obtain DMA buffer address.
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*/
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std::array<int8_t, BUFFER_SIZE> *get_buffer_address(void);
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/*!
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* \brief Transfer DMA data
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*/
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int DMA_write(int nbytes);
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/*!
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* \brief Close the DMA device driver
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*/
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int DMA_close(void);
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private:
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#if INTPTR_MAX == INT64_MAX // 64-bit processor architecture
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channel tx_channel;
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#else // 32-bit processor architecture
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std::array<int8_t, BUFFER_SIZE> buffer;
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int tx_fd;
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#endif
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};
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#endif // GNSS_SDR_FPGA_DMA_H
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