/** * Copyright (c) 2015 - 2020, Nordic Semiconductor ASA * * All rights reserved. * * Redistribution and use in source and binary forms, with or without modification, * are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright notice, this * list of conditions and the following disclaimer. * * 2. Redistributions in binary form, except as embedded into a Nordic * Semiconductor ASA integrated circuit in a product or a software update for * such product, must reproduce the above copyright notice, this list of * conditions and the following disclaimer in the documentation and/or other * materials provided with the distribution. * * 3. Neither the name of Nordic Semiconductor ASA nor the names of its * contributors may be used to endorse or promote products derived from this * software without specific prior written permission. * * 4. This software, with or without modification, must only be used with a * Nordic Semiconductor ASA integrated circuit. * * 5. Any software provided in binary form under this license must not be reverse * engineered, decompiled, modified and/or disassembled. * * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * */ #ifndef NRF_TWI_H__ #define NRF_TWI_H__ #include #ifdef __cplusplus extern "C" { #endif /** * @defgroup nrf_twi_hal TWI HAL * @{ * @ingroup nrf_twi * @brief Hardware access layer for managing the TWI peripheral. */ /** @brief TWI tasks. */ typedef enum { NRF_TWI_TASK_STARTRX = offsetof(NRF_TWI_Type, TASKS_STARTRX), ///< Start TWI receive sequence. NRF_TWI_TASK_STARTTX = offsetof(NRF_TWI_Type, TASKS_STARTTX), ///< Start TWI transmit sequence. NRF_TWI_TASK_STOP = offsetof(NRF_TWI_Type, TASKS_STOP), ///< Stop TWI transaction. NRF_TWI_TASK_SUSPEND = offsetof(NRF_TWI_Type, TASKS_SUSPEND), ///< Suspend TWI transaction. NRF_TWI_TASK_RESUME = offsetof(NRF_TWI_Type, TASKS_RESUME) ///< Resume TWI transaction. } nrf_twi_task_t; /** @brief TWI events. */ typedef enum { NRF_TWI_EVENT_STOPPED = offsetof(NRF_TWI_Type, EVENTS_STOPPED), ///< TWI stopped. NRF_TWI_EVENT_RXDREADY = offsetof(NRF_TWI_Type, EVENTS_RXDREADY), ///< TWI RXD byte received. NRF_TWI_EVENT_TXDSENT = offsetof(NRF_TWI_Type, EVENTS_TXDSENT), ///< TWI TXD byte sent. NRF_TWI_EVENT_ERROR = offsetof(NRF_TWI_Type, EVENTS_ERROR), ///< TWI error. NRF_TWI_EVENT_BB = offsetof(NRF_TWI_Type, EVENTS_BB), ///< TWI byte boundary, generated before each byte that is sent or received. NRF_TWI_EVENT_SUSPENDED = offsetof(NRF_TWI_Type, EVENTS_SUSPENDED) ///< TWI entered the suspended state. } nrf_twi_event_t; /** @brief TWI shortcuts. */ typedef enum { NRF_TWI_SHORT_BB_SUSPEND_MASK = TWI_SHORTS_BB_SUSPEND_Msk, ///< Shortcut between BB event and SUSPEND task. NRF_TWI_SHORT_BB_STOP_MASK = TWI_SHORTS_BB_STOP_Msk, ///< Shortcut between BB event and STOP task. NRF_TWI_ALL_SHORTS_MASK = TWI_SHORTS_BB_SUSPEND_Msk | TWI_SHORTS_BB_STOP_Msk ///< All TWI shortcuts. } nrf_twi_short_mask_t; /** @brief TWI interrupts. */ typedef enum { NRF_TWI_INT_STOPPED_MASK = TWI_INTENSET_STOPPED_Msk, ///< Interrupt on STOPPED event. NRF_TWI_INT_RXDREADY_MASK = TWI_INTENSET_RXDREADY_Msk, ///< Interrupt on RXDREADY event. NRF_TWI_INT_TXDSENT_MASK = TWI_INTENSET_TXDSENT_Msk, ///< Interrupt on TXDSENT event. NRF_TWI_INT_ERROR_MASK = TWI_INTENSET_ERROR_Msk, ///< Interrupt on ERROR event. NRF_TWI_INT_BB_MASK = TWI_INTENSET_BB_Msk, ///< Interrupt on BB event. NRF_TWI_INT_SUSPENDED_MASK = TWI_INTENSET_SUSPENDED_Msk, ///< Interrupt on SUSPENDED event. NRF_TWI_ALL_INTS_MASK = TWI_INTENSET_STOPPED_Msk | TWI_INTENSET_RXDREADY_Msk | TWI_INTENSET_TXDSENT_Msk | TWI_INTENSET_ERROR_Msk | TWI_INTENSET_BB_Msk | TWI_INTENSET_SUSPENDED_Msk ///< All TWI interrupts. } nrf_twi_int_mask_t; /** @brief TWI error source. */ typedef enum { NRF_TWI_ERROR_ADDRESS_NACK = TWI_ERRORSRC_ANACK_Msk, ///< NACK received after sending the address. NRF_TWI_ERROR_DATA_NACK = TWI_ERRORSRC_DNACK_Msk, ///< NACK received after sending a data byte. NRF_TWI_ERROR_OVERRUN = TWI_ERRORSRC_OVERRUN_Msk ///< Overrun error. /**< A new byte was received before the previous byte was read * from the RXD register (previous data is lost). */ } nrf_twi_error_t; /** @brief TWI master clock frequency. */ typedef enum { NRF_TWI_FREQ_100K = TWI_FREQUENCY_FREQUENCY_K100, ///< 100 kbps. NRF_TWI_FREQ_250K = TWI_FREQUENCY_FREQUENCY_K250, ///< 250 kbps. NRF_TWI_FREQ_400K = TWI_FREQUENCY_FREQUENCY_K400 ///< 400 kbps. } nrf_twi_frequency_t; /** * @brief Function for activating the specified TWI task. * * @param[in] p_reg Pointer to the structure of registers of the peripheral. * @param[in] task Task to be activated. */ __STATIC_INLINE void nrf_twi_task_trigger(NRF_TWI_Type * p_reg, nrf_twi_task_t task); /** * @brief Function for getting the address of the specified TWI task register. * * @param[in] p_reg Pointer to the structure of registers of the peripheral. * @param[in] task The specified task. * * @return Address of the specified task register. */ __STATIC_INLINE uint32_t * nrf_twi_task_address_get(NRF_TWI_Type * p_reg, nrf_twi_task_t task); /** * @brief Function for clearing the specified TWI event. * * @param[in] p_reg Pointer to the structure of registers of the peripheral. * @param[in] event Event to clear. */ __STATIC_INLINE void nrf_twi_event_clear(NRF_TWI_Type * p_reg, nrf_twi_event_t event); /** * @brief Function for retrieving the state of the TWI event. * * @param[in] p_reg Pointer to the structure of registers of the peripheral. * @param[in] event Event to be checked. * * @retval true The event has been generated. * @retval false The event has not been generated. */ __STATIC_INLINE bool nrf_twi_event_check(NRF_TWI_Type * p_reg, nrf_twi_event_t event); /** * @brief Function for getting the address of the specified TWI event register. * * @param[in] p_reg Pointer to the structure of registers of the peripheral. * @param[in] event The specified event. * * @return Address of the specified event register. */ __STATIC_INLINE uint32_t * nrf_twi_event_address_get(NRF_TWI_Type * p_reg, nrf_twi_event_t event); /** * @brief Function for enabling the specified shortcuts. * * @param[in] p_reg Pointer to the structure of registers of the peripheral. * @param[in] mask Shortcuts to be enabled. */ __STATIC_INLINE void nrf_twi_shorts_enable(NRF_TWI_Type * p_reg, uint32_t mask); /** * @brief Function for disabling the specified shortcuts. * * @param[in] p_reg Pointer to the structure of registers of the peripheral. * @param[in] mask Shortcuts to be disabled. */ __STATIC_INLINE void nrf_twi_shorts_disable(NRF_TWI_Type * p_reg, uint32_t mask); /** * @brief Function for enabling the specified interrupts. * * @param[in] p_reg Pointer to the structure of registers of the peripheral. * @param[in] mask Mask of interrupts to be enabled. */ __STATIC_INLINE void nrf_twi_int_enable(NRF_TWI_Type * p_reg, uint32_t mask); /** * @brief Function for disabling the specified interrupts. * * @param[in] p_reg Pointer to the structure of registers of the peripheral. * @param[in] mask Mask of interrupts to be disabled. */ __STATIC_INLINE void nrf_twi_int_disable(NRF_TWI_Type * p_reg, uint32_t mask); /** * @brief Function for retrieving the state of a given interrupt. * * @param[in] p_reg Pointer to the structure of registers of the peripheral. * @param[in] twi_int Interrupt to be checked. * * @retval true The interrupt is enabled. * @retval false The interrupt is not enabled. */ __STATIC_INLINE bool nrf_twi_int_enable_check(NRF_TWI_Type * p_reg, nrf_twi_int_mask_t twi_int); /** * @brief Function for enabling the TWI peripheral. * * @param[in] p_reg Pointer to the structure of registers of the peripheral. */ __STATIC_INLINE void nrf_twi_enable(NRF_TWI_Type * p_reg); /** * @brief Function for disabling the TWI peripheral. * * @param[in] p_reg Pointer to the structure of registers of the peripheral. */ __STATIC_INLINE void nrf_twi_disable(NRF_TWI_Type * p_reg); /** * @brief Function for configuring TWI pins. * * @param[in] p_reg Pointer to the structure of registers of the peripheral. * @param[in] scl_pin SCL pin number. * @param[in] sda_pin SDA pin number. */ __STATIC_INLINE void nrf_twi_pins_set(NRF_TWI_Type * p_reg, uint32_t scl_pin, uint32_t sda_pin); /** * @brief Function for retrieving the SCL pin number. * * @param[in] p_reg Pointer to the structure of registers of the peripheral. * * @return SCL pin number. */ __STATIC_INLINE uint32_t nrf_twi_scl_pin_get(NRF_TWI_Type * p_reg); /** * @brief Function for retrieving the SDA pin number. * * @param[in] p_reg Pointer to the structure of registers of the peripheral. * * @return SDA pin number. */ __STATIC_INLINE uint32_t nrf_twi_sda_pin_get(NRF_TWI_Type * p_reg); /** * @brief Function for setting the TWI master clock frequency. * * @param[in] p_reg Pointer to the structure of registers of the peripheral. * @param[in] frequency TWI frequency. */ __STATIC_INLINE void nrf_twi_frequency_set(NRF_TWI_Type * p_reg, nrf_twi_frequency_t frequency); /** * @brief Function for checking the TWI error source. * * The error flags are cleared after reading. * * @param[in] p_reg Pointer to the structure of registers of the peripheral. * * @return Mask with error source flags. */ __STATIC_INLINE uint32_t nrf_twi_errorsrc_get_and_clear(NRF_TWI_Type * p_reg); /** * @brief Function for setting the address to be used in TWI transfers. * * @param[in] p_reg Pointer to the structure of registers of the peripheral. * @param[in] address Address to be used in transfers. */ __STATIC_INLINE void nrf_twi_address_set(NRF_TWI_Type * p_reg, uint8_t address); /** * @brief Function for reading data received by TWI. * * @param[in] p_reg Pointer to the structure of registers of the peripheral. * * @return Received data. */ __STATIC_INLINE uint8_t nrf_twi_rxd_get(NRF_TWI_Type * p_reg); /** * @brief Function for writing data to be transmitted by TWI. * * @param[in] p_reg Pointer to the structure of registers of the peripheral. * @param[in] data Data to be transmitted. */ __STATIC_INLINE void nrf_twi_txd_set(NRF_TWI_Type * p_reg, uint8_t data); /** * @brief Function for setting the specified shortcuts. * * @param[in] p_reg Pointer to the structure of registers of the peripheral. * @param[in] mask Shortcuts to be set. */ __STATIC_INLINE void nrf_twi_shorts_set(NRF_TWI_Type * p_reg, uint32_t mask); #ifndef SUPPRESS_INLINE_IMPLEMENTATION __STATIC_INLINE void nrf_twi_task_trigger(NRF_TWI_Type * p_reg, nrf_twi_task_t task) { *((volatile uint32_t *)((uint8_t *)p_reg + (uint32_t)task)) = 0x1UL; } __STATIC_INLINE uint32_t * nrf_twi_task_address_get(NRF_TWI_Type * p_reg, nrf_twi_task_t task) { return (uint32_t *)((uint8_t *)p_reg + (uint32_t)task); } __STATIC_INLINE void nrf_twi_event_clear(NRF_TWI_Type * p_reg, nrf_twi_event_t event) { *((volatile uint32_t *)((uint8_t *)p_reg + (uint32_t)event)) = 0x0UL; #if __CORTEX_M == 0x04 volatile uint32_t dummy = *((volatile uint32_t *)((uint8_t *)p_reg + (uint32_t)event)); (void)dummy; #endif } __STATIC_INLINE bool nrf_twi_event_check(NRF_TWI_Type * p_reg, nrf_twi_event_t event) { return (bool)*(volatile uint32_t *)((uint8_t *)p_reg + (uint32_t)event); } __STATIC_INLINE uint32_t * nrf_twi_event_address_get(NRF_TWI_Type * p_reg, nrf_twi_event_t event) { return (uint32_t *)((uint8_t *)p_reg + (uint32_t)event); } __STATIC_INLINE void nrf_twi_shorts_enable(NRF_TWI_Type * p_reg, uint32_t mask) { p_reg->SHORTS |= mask; } __STATIC_INLINE void nrf_twi_shorts_disable(NRF_TWI_Type * p_reg, uint32_t mask) { p_reg->SHORTS &= ~(mask); } __STATIC_INLINE void nrf_twi_int_enable(NRF_TWI_Type * p_reg, uint32_t mask) { p_reg->INTENSET = mask; } __STATIC_INLINE void nrf_twi_int_disable(NRF_TWI_Type * p_reg, uint32_t mask) { p_reg->INTENCLR = mask; } __STATIC_INLINE bool nrf_twi_int_enable_check(NRF_TWI_Type * p_reg, nrf_twi_int_mask_t twi_int) { return (bool)(p_reg->INTENSET & twi_int); } __STATIC_INLINE void nrf_twi_enable(NRF_TWI_Type * p_reg) { p_reg->ENABLE = (TWI_ENABLE_ENABLE_Enabled << TWI_ENABLE_ENABLE_Pos); } __STATIC_INLINE void nrf_twi_disable(NRF_TWI_Type * p_reg) { p_reg->ENABLE = (TWI_ENABLE_ENABLE_Disabled << TWI_ENABLE_ENABLE_Pos); } __STATIC_INLINE void nrf_twi_pins_set(NRF_TWI_Type * p_reg, uint32_t scl_pin, uint32_t sda_pin) { #if defined(TWI_PSEL_SCL_CONNECT_Pos) p_reg->PSEL.SCL = scl_pin; #else p_reg->PSELSCL = scl_pin; #endif #if defined(TWI_PSEL_SDA_CONNECT_Pos) p_reg->PSEL.SDA = sda_pin; #else p_reg->PSELSDA = sda_pin; #endif } __STATIC_INLINE uint32_t nrf_twi_scl_pin_get(NRF_TWI_Type * p_reg) { #if defined(TWI_PSEL_SCL_CONNECT_Pos) return p_reg->PSEL.SCL; #else return p_reg->PSELSCL; #endif } __STATIC_INLINE uint32_t nrf_twi_sda_pin_get(NRF_TWI_Type * p_reg) { #if defined(TWI_PSEL_SDA_CONNECT_Pos) return p_reg->PSEL.SDA; #else return p_reg->PSELSDA; #endif } __STATIC_INLINE void nrf_twi_frequency_set(NRF_TWI_Type * p_reg, nrf_twi_frequency_t frequency) { p_reg->FREQUENCY = frequency; } __STATIC_INLINE uint32_t nrf_twi_errorsrc_get_and_clear(NRF_TWI_Type * p_reg) { uint32_t error_source = p_reg->ERRORSRC; // [error flags are cleared by writing '1' on their position] p_reg->ERRORSRC = error_source; return error_source; } __STATIC_INLINE void nrf_twi_address_set(NRF_TWI_Type * p_reg, uint8_t address) { p_reg->ADDRESS = address; } __STATIC_INLINE uint8_t nrf_twi_rxd_get(NRF_TWI_Type * p_reg) { return (uint8_t)p_reg->RXD; } __STATIC_INLINE void nrf_twi_txd_set(NRF_TWI_Type * p_reg, uint8_t data) { p_reg->TXD = data; } __STATIC_INLINE void nrf_twi_shorts_set(NRF_TWI_Type * p_reg, uint32_t mask) { p_reg->SHORTS = mask; } #endif // SUPPRESS_INLINE_IMPLEMENTATION /** @} */ #ifdef __cplusplus } #endif #endif // NRF_TWI_H__