115 lines
7.1 KiB
C
115 lines
7.1 KiB
C
// #################################################################################################
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// # << NEORV32: neorv32_slink.h - Stream Link Interface HW Driver >> #
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// # ********************************************************************************************* #
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// # BSD 3-Clause License #
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// # #
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// # Copyright (c) 2024, Stephan Nolting. All rights reserved. #
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// # #
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// # Redistribution and use in source and binary forms, with or without modification, are #
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// # permitted provided that the following conditions are met: #
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// # #
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// # 1. Redistributions of source code must retain the above copyright notice, this list of #
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// # conditions and the following disclaimer. #
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// # #
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// # 2. Redistributions in binary form must reproduce the above copyright notice, this list of #
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// # conditions and the following disclaimer in the documentation and/or other materials #
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// # provided with the distribution. #
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// # #
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// # 3. Neither the name of the copyright holder nor the names of its contributors may be used to #
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// # endorse or promote products derived from this software without specific prior written #
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// # permission. #
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// # #
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// # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS #
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// # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF #
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// # MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE #
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// # COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, #
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// # EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE #
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// # GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED #
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// # AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING #
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// # NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED #
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// # OF THE POSSIBILITY OF SUCH DAMAGE. #
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// # ********************************************************************************************* #
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// # The NEORV32 Processor - https://github.com/stnolting/neorv32 (c) Stephan Nolting #
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// #################################################################################################
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/**********************************************************************//**
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* @file neorv32_slink.h
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* @brief Stream Link Interface HW driver header file.
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**************************************************************************/
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#ifndef neorv32_slink_h
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#define neorv32_slink_h
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/**********************************************************************//**
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* @name IO Device: Stream Link Interface (SLINK)
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**************************************************************************/
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/**@{*/
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/** SLINK module prototype */
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typedef volatile struct __attribute__((packed,aligned(4))) {
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uint32_t CTRL; /**< offset 0: control register (#NEORV32_SLINK_CTRL_enum) */
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uint32_t RX_DATA; /**< offset 4: rx data register */
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uint32_t TX_DATA; /**< offset 8: rx data register */
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uint32_t TX_DATA_LAST; /**< offset 12: rx data register + end-of-stream delimiter */
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} neorv32_slink_t;
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/** SLINK module hardware access (#neorv32_slink_t) */
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#define NEORV32_SLINK ((neorv32_slink_t*) (NEORV32_SLINK_BASE))
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/** SLINK control register bits */
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enum NEORV32_SLINK_CTRL_enum {
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SLINK_CTRL_EN = 0, /**< SLINK control register(0) (r/w): SLINK unit enable */
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SLINK_CTRL_RX_CLR = 1, /**< SLINK control register(1) (-/w): Clear RX FIFO, auto-clears */
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SLINK_CTRL_TX_CLR = 2, /**< SLINK control register(2) (-/w): Clear TX FIFO, auto-clears */
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SLINK_CTRL_RX_LAST = 4, /**< SLINK control register(4) (r/-): RX end-of-stream delimiter */
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SLINK_CTRL_RX_EMPTY = 8, /**< SLINK control register(8) (r/-): RX FIFO empty */
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SLINK_CTRL_RX_HALF = 9, /**< SLINK control register(9) (r/-): RX FIFO at least half full */
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SLINK_CTRL_RX_FULL = 10, /**< SLINK control register(10) (r/-): RX FIFO full */
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SLINK_CTRL_TX_EMPTY = 11, /**< SLINK control register(11) (r/-): TX FIFO empty */
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SLINK_CTRL_TX_HALF = 12, /**< SLINK control register(12) (r/-): TX FIFO at least half full */
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SLINK_CTRL_TX_FULL = 13, /**< SLINK control register(13) (r/-): TX FIFO full */
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SLINK_CTRL_IRQ_RX_NEMPTY = 16, /**< SLINK control register(16) (r/w): IRQ if RX FIFO not empty */
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SLINK_CTRL_IRQ_RX_HALF = 17, /**< SLINK control register(17) (r/w): IRQ if RX FIFO at least half full */
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SLINK_CTRL_IRQ_RX_FULL = 18, /**< SLINK control register(18) (r/w): IRQ if RX FIFO full */
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SLINK_CTRL_IRQ_TX_EMPTY = 19, /**< SLINK control register(19) (r/w): IRQ if TX FIFO empty */
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SLINK_CTRL_IRQ_TX_NHALF = 20, /**< SLINK control register(20) (r/w): IRQ if TX FIFO not at least half full */
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SLINK_CTRL_IRQ_TX_NFULL = 21, /**< SLINK control register(21) (r/w): IRQ if TX FIFO not full */
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SLINK_CTRL_RX_FIFO_LSB = 24, /**< SLINK control register(24) (r/-): log2(RX FIFO size) LSB */
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SLINK_CTRL_RX_FIFO_MSB = 27, /**< SLINK control register(27) (r/-): log2(RX FIFO size) MSB */
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SLINK_CTRL_TX_FIFO_LSB = 28, /**< SLINK control register(28) (r/-): log2(TX FIFO size) LSB */
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SLINK_CTRL_TX_FIFO_MSB = 31, /**< SLINK control register(31) (r/-): log2(TX FIFO size) MSB */
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};
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enum NEORV32_SLINK_STATUS_enum {
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SLINK_FIFO_EMPTY = 0, /**< FIFO is empty */
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SLINK_FIFO_HALF = 1, /**< FIFO is at least half full */
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SLINK_FIFO_FULL = 2 /**< FIFO is full */
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};
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/**@}*/
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/**********************************************************************//**
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* @name Prototypes
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**************************************************************************/
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/**@{*/
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int neorv32_slink_available(void);
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void neorv32_slink_setup(uint32_t irq_config);
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void neorv32_slink_rx_clear(void);
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void neorv32_slink_tx_clear(void);
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int neorv32_slink_get_rx_fifo_depth(void);
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int neorv32_slink_get_tx_fifo_depth(void);
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uint32_t neorv32_slink_get(void);
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uint32_t neorv32_slink_check_last(void);
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void neorv32_slink_put(uint32_t tx_data);
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void neorv32_slink_put_last(uint32_t tx_data);
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int neorv32_slink_rx_status(void);
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int neorv32_slink_tx_status(void);
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/**@}*/
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#endif // neorv32_slink_h
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