213 lines
8.5 KiB
C
213 lines
8.5 KiB
C
// #################################################################################################
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// # << NEORV32: neorv32_slink.c - 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) 2023, 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.c
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* @brief Stream Link Interface HW driver source file.
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**************************************************************************/
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#include "neorv32.h"
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#include "neorv32_slink.h"
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/**********************************************************************//**
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* Check if stream link interface was synthesized.
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*
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* @return 0 if SLINK was not synthesized, 1 if SLINK is available.
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**************************************************************************/
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int neorv32_slink_available(void) {
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if (NEORV32_SYSINFO->SOC & (1 << SYSINFO_SOC_IO_SLINK)) {
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return 1;
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}
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else {
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return 0;
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}
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}
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/**********************************************************************//**
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* Reset, enable and configure SLINK.
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*
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* @param[in] irq_config Configure RX and TX interrupt conditions (#NEORV32_SLINK_CTRL_enum).
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**************************************************************************/
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void neorv32_slink_setup(uint32_t irq_config) {
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NEORV32_SLINK->CTRL = 0; // reset and disable
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uint32_t tmp = 0;
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tmp |= (uint32_t)(1 & 0x01) << SLINK_CTRL_EN;
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tmp |= (uint32_t)(irq_config & 0x00ff0000);
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NEORV32_SLINK->CTRL = tmp;
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}
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/**********************************************************************//**
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* Clear RX FIFO.
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**************************************************************************/
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void neorv32_slink_rx_clear(void) {
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NEORV32_SLINK->CTRL |= 1 << SLINK_CTRL_RX_CLR; // auto-clears
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}
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/**********************************************************************//**
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* Clear TX FIFO.
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**************************************************************************/
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void neorv32_slink_tx_clear(void) {
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NEORV32_SLINK->CTRL |= 1 << SLINK_CTRL_TX_CLR; // auto-clears
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}
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/**********************************************************************//**
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* Get FIFO depth of RX link.
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*
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* @return FIFO depth of RX link (1..32768).
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**************************************************************************/
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int neorv32_slink_get_rx_fifo_depth(void) {
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uint32_t tmp = (NEORV32_SLINK->CTRL >> SLINK_CTRL_RX_FIFO_LSB) & 0x0f;
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return (int)(1 << tmp);
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}
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/**********************************************************************//**
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* Get FIFO depth of TX link.
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*
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* @return FIFO depth of TX link (1..32768).
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**************************************************************************/
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int neorv32_slink_get_tx_fifo_depth(void) {
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uint32_t tmp = (NEORV32_SLINK->CTRL >> SLINK_CTRL_TX_FIFO_LSB) & 0x0f;
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return (int)(1 << tmp);
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}
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/**********************************************************************//**
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* Read data from RX link (non-blocking)
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*
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* @return Data received from link.
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**************************************************************************/
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inline uint32_t __attribute__((always_inline)) neorv32_slink_get(void) {
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return NEORV32_SLINK->RX_DATA;
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}
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/**********************************************************************//**
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* Check if last RX word has "end-of-stream" delimiter.
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*
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* @note This needs has to be called AFTER reading the actual data word
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* using #neorv32_slink_get(void).
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*
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* @return 0 if not end of stream, !=0 if end of stream.
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**************************************************************************/
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inline uint32_t __attribute__((always_inline)) neorv32_slink_check_last(void) {
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return NEORV32_SLINK->CTRL & (1 << SLINK_CTRL_RX_LAST);
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}
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/**********************************************************************//**
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* Write data to TX link (non-blocking)
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*
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* @param[in] tx_data Data to send to link.
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**************************************************************************/
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inline void __attribute__((always_inline)) neorv32_slink_put(uint32_t tx_data) {
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NEORV32_SLINK->TX_DATA = tx_data;
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}
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/**********************************************************************//**
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* Write data to TX link (non-blocking) and set "last" (end-of-stream)
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* delimiter.
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*
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* @param[in] tx_data Data to send to link.
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**************************************************************************/
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inline void __attribute__((always_inline)) neorv32_slink_put_last(uint32_t tx_data) {
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NEORV32_SLINK->TX_DATA_LAST = tx_data;
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}
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/**********************************************************************//**
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* Get RX link FIFO status.
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*
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* @return FIFO status #NEORV32_SLINK_STATUS_enum.
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**************************************************************************/
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int neorv32_slink_rx_status(void) {
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uint32_t tmp = NEORV32_SLINK->CTRL;
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if (tmp & (1 << SLINK_CTRL_RX_FULL)) {
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return SLINK_FIFO_FULL;
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}
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else if (tmp & (1 << SLINK_CTRL_RX_HALF)) {
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return SLINK_FIFO_HALF;
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}
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else if (tmp & (1 << SLINK_CTRL_RX_EMPTY)) {
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return SLINK_FIFO_EMPTY;
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}
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else {
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return -1;
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}
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}
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/**********************************************************************//**
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* Get TX link FIFO status.
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*
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* @return FIFO status #NEORV32_SLINK_STATUS_enum.
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**************************************************************************/
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int neorv32_slink_tx_status(void) {
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uint32_t tmp = NEORV32_SLINK->CTRL;
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if (tmp & (1 << SLINK_CTRL_TX_FULL)) {
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return SLINK_FIFO_FULL;
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}
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else if (tmp & (1 << SLINK_CTRL_TX_HALF)) {
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return SLINK_FIFO_HALF;
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}
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else if (tmp & (1 << SLINK_CTRL_TX_EMPTY)) {
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return SLINK_FIFO_EMPTY;
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}
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else {
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return -1;
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}
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}
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