118 lines
7.4 KiB
C
118 lines
7.4 KiB
C
// #################################################################################################
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// # << NEORV32: neorv32_onewire.h - 1-Wire Interface Controller HW Driver (Header) >> #
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// # ********************************************************************************************* #
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// # BSD 3-Clause License #
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// # #
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// # Copyright (c) 2022, 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_onewire.h
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* @brief 1-Wire Interface Controller (ONEWIRE) HW driver header file.
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*
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* @note These functions should only be used if the ONEWIRE unit was synthesized (IO_ONEWIRE_EN = true).
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**************************************************************************/
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#ifndef neorv32_onewire_h
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#define neorv32_onewire_h
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/**********************************************************************//**
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* @name IO Device: 1-Wire Interface Controller (ONEWIRE)
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**************************************************************************/
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/**@{*/
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/** ONEWIRE 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_ONEWIRE_CTRL_enum) */
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uint32_t DATA; /**< offset 4: transmission data register (#NEORV32_ONEWIRE_DATA_enum) */
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} neorv32_onewire_t;
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/** ONEWIRE module hardware access (#neorv32_onewire_t) */
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#define NEORV32_ONEWIRE ((neorv32_onewire_t*) (NEORV32_ONEWIRE_BASE))
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/** ONEWIRE control register bits */
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enum NEORV32_ONEWIRE_CTRL_enum {
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ONEWIRE_CTRL_EN = 0, /**< ONEWIRE control register(0) (r/w): ONEWIRE controller enable */
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ONEWIRE_CTRL_PRSC0 = 1, /**< ONEWIRE control register(1) (r/w): Clock prescaler select bit 0 */
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ONEWIRE_CTRL_PRSC1 = 2, /**< ONEWIRE control register(2) (r/w): Clock prescaler select bit 1 */
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ONEWIRE_CTRL_CLKDIV0 = 3, /**< ONEWIRE control register(3) (r/w): Clock divider bit 0 */
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ONEWIRE_CTRL_CLKDIV1 = 4, /**< ONEWIRE control register(4) (r/w): Clock divider bit 1 */
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ONEWIRE_CTRL_CLKDIV2 = 5, /**< ONEWIRE control register(5) (r/w): Clock divider bit 2 */
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ONEWIRE_CTRL_CLKDIV3 = 6, /**< ONEWIRE control register(6) (r/w): Clock divider bit 3 */
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ONEWIRE_CTRL_CLKDIV4 = 7, /**< ONEWIRE control register(7) (r/w): Clock divider bit 4 */
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ONEWIRE_CTRL_CLKDIV5 = 8, /**< ONEWIRE control register(8) (r/w): Clock divider bit 5 */
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ONEWIRE_CTRL_CLKDIV6 = 9, /**< ONEWIRE control register(9) (r/w): Clock divider bit 6 */
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ONEWIRE_CTRL_CLKDIV7 = 10, /**< ONEWIRE control register(10) (r/w): Clock divider bit 7 */
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ONEWIRE_CTRL_TRIG_RST = 11, /**< ONEWIRE control register(11) (-/w): Trigger reset pulse, auto-clears */
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ONEWIRE_CTRL_TRIG_BIT = 12, /**< ONEWIRE control register(12) (-/w): Trigger single-bit transmission, auto-clears */
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ONEWIRE_CTRL_TRIG_BYTE = 13, /**< ONEWIRE control register(13) (-/w): Trigger full-byte transmission, auto-clears */
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ONEWIRE_CTRL_SENSE = 29, /**< ONEWIRE control register(29) (r/-): Current state of the bus line */
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ONEWIRE_CTRL_PRESENCE = 30, /**< ONEWIRE control register(30) (r/-): Bus presence detected */
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ONEWIRE_CTRL_BUSY = 31, /**< ONEWIRE control register(31) (r/-): Operation in progress when set */
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};
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/** ONEWIRE receive/transmit data register bits */
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enum NEORV32_ONEWIRE_DATA_enum {
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ONEWIRE_DATA_LSB = 0, /**< ONEWIRE data register(0) (r/w): Receive/transmit data (8-bit) LSB */
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ONEWIRE_DATA_MSB = 7 /**< ONEWIRE data register(7) (r/w): Receive/transmit data (8-bit) MSB */
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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_onewire_available(void);
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int neorv32_onewire_setup(uint32_t t_base);
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void neorv32_onewire_enable(void);
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void neorv32_onewire_disable(void);
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int neorv32_onewire_sense(void);
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int neorv32_onewire_busy(void);
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void neorv32_onewire_reset(void);
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int neorv32_onewire_reset_get_presence(void);
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void neorv32_onewire_read_bit(void);
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uint8_t neorv32_onewire_read_bit_get(void);
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void neorv32_onewire_write_bit(uint8_t bit);
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void neorv32_onewire_read_byte(void);
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uint8_t neorv32_onewire_read_byte_get(void);
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void neorv32_onewire_write_byte(uint8_t byte);
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int neorv32_onewire_reset_blocking(void);
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uint8_t neorv32_onewire_read_bit_blocking(void);
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void neorv32_onewire_write_bit_blocking(uint8_t bit);
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uint8_t neorv32_onewire_read_byte_blocking(void);
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void neorv32_onewire_write_byte_blocking(uint8_t byte);
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/**@}*/
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#endif // neorv32_onewire_h
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