| /* Copyright (c) 2015-2017 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 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. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER 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__ |
| |
| /** |
| * @defgroup nrf_twi_hal TWI HAL |
| * @{ |
| * @ingroup nrf_twi |
| * |
| * @brief Hardware access layer for managing the TWI peripheral. |
| */ |
| |
| #include <stdint.h> |
| #include <stddef.h> |
| #include <stdbool.h> |
| |
| #include "nrf_peripherals.h" |
| #include "nrf.h" |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| /** |
| * @brief TWI tasks. |
| */ |
| typedef enum |
| { |
| /*lint -save -e30*/ |
| 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. |
| /*lint -restore*/ |
| } nrf_twi_task_t; |
| |
| /** |
| * @brief TWI events. |
| */ |
| typedef enum |
| { |
| /*lint -save -e30*/ |
| 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. |
| /*lint -restore*/ |
| } 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_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_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 a specific TWI task. |
| * |
| * @param[in] p_reg Pointer to the peripheral registers structure. |
| * @param[in] task Task to activate. |
| */ |
| __STATIC_INLINE void nrf_twi_task_trigger(NRF_TWI_Type * p_reg, |
| nrf_twi_task_t task); |
| |
| /** |
| * @brief Function for getting the address of a specific TWI task register. |
| * |
| * @param[in] p_reg Pointer to the peripheral registers structure. |
| * @param[in] task Requested 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 a specific TWI event. |
| * |
| * @param[in] p_reg Pointer to the peripheral registers structure. |
| * @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 checking the state of a specific event. |
| * |
| * @param[in] p_reg Pointer to the peripheral registers structure. |
| * @param[in] event Event to check. |
| * |
| * @retval true If the event is set. |
| * @retval false If the event is not set. |
| */ |
| __STATIC_INLINE bool nrf_twi_event_check(NRF_TWI_Type * p_reg, |
| nrf_twi_event_t event); |
| |
| /** |
| * @brief Function for getting the address of a specific TWI event register. |
| * |
| * @param[in] p_reg Pointer to the peripheral registers structure. |
| * @param[in] event Requested 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 specified shortcuts. |
| * |
| * @param[in] p_reg Pointer to the peripheral registers structure. |
| * @param[in] shorts_mask Shortcuts to enable. |
| */ |
| __STATIC_INLINE void nrf_twi_shorts_enable(NRF_TWI_Type * p_reg, |
| uint32_t shorts_mask); |
| |
| /** |
| * @brief Function for disabling specified shortcuts. |
| * |
| * @param[in] p_reg Pointer to the peripheral registers structure. |
| * @param[in] shorts_mask Shortcuts to disable. |
| */ |
| __STATIC_INLINE void nrf_twi_shorts_disable(NRF_TWI_Type * p_reg, |
| uint32_t shorts_mask); |
| |
| /** |
| * @brief Function for enabling specified interrupts. |
| * |
| * @param[in] p_reg Pointer to the peripheral registers structure. |
| * @param[in] int_mask Interrupts to enable. |
| */ |
| __STATIC_INLINE void nrf_twi_int_enable(NRF_TWI_Type * p_reg, |
| uint32_t int_mask); |
| |
| /** |
| * @brief Function for disabling specified interrupts. |
| * |
| * @param[in] p_reg Pointer to the peripheral registers structure. |
| * @param[in] int_mask Interrupts to disable. |
| */ |
| __STATIC_INLINE void nrf_twi_int_disable(NRF_TWI_Type * p_reg, |
| uint32_t int_mask); |
| |
| /** |
| * @brief Function for retrieving the state of a given interrupt. |
| * |
| * @param[in] p_reg Pointer to the peripheral registers structure. |
| * @param[in] int_mask Interrupt to check. |
| * |
| * @retval true If the interrupt is enabled. |
| * @retval false If the interrupt is not enabled. |
| */ |
| __STATIC_INLINE bool nrf_twi_int_enable_check(NRF_TWI_Type * p_reg, |
| nrf_twi_int_mask_t int_mask); |
| |
| /** |
| * @brief Function for enabling the TWI peripheral. |
| * |
| * @param[in] p_reg Pointer to the peripheral registers structure. |
| */ |
| __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 peripheral registers structure. |
| */ |
| __STATIC_INLINE void nrf_twi_disable(NRF_TWI_Type * p_reg); |
| |
| /** |
| * @brief Function for configuring TWI pins. |
| * |
| * |
| * @param[in] p_reg Pointer to the peripheral registers structure. |
| * @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 setting the TWI master clock frequency. |
| * |
| * @param[in] p_reg Pointer to the peripheral registers structure. |
| * @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 peripheral registers structure. |
| * |
| * @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 peripheral registers structure. |
| * @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 peripheral registers structure. |
| * |
| * @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 peripheral registers structure. |
| * @param[in] data Data to be transmitted. |
| */ |
| __STATIC_INLINE void nrf_twi_txd_set(NRF_TWI_Type * p_reg, uint8_t data); |
| |
| __STATIC_INLINE void nrf_twi_shorts_set(NRF_TWI_Type * p_reg, |
| uint32_t shorts_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 shorts_mask) |
| { |
| p_reg->SHORTS |= shorts_mask; |
| } |
| |
| __STATIC_INLINE void nrf_twi_shorts_disable(NRF_TWI_Type * p_reg, |
| uint32_t shorts_mask) |
| { |
| p_reg->SHORTS &= ~(shorts_mask); |
| } |
| |
| __STATIC_INLINE void nrf_twi_int_enable(NRF_TWI_Type * p_reg, |
| uint32_t int_mask) |
| { |
| p_reg->INTENSET = int_mask; |
| } |
| |
| __STATIC_INLINE void nrf_twi_int_disable(NRF_TWI_Type * p_reg, |
| uint32_t int_mask) |
| { |
| p_reg->INTENCLR = int_mask; |
| } |
| |
| __STATIC_INLINE bool nrf_twi_int_enable_check(NRF_TWI_Type * p_reg, |
| nrf_twi_int_mask_t int_mask) |
| { |
| return (bool)(p_reg->INTENSET & int_mask); |
| } |
| |
| __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 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 shorts_mask) |
| { |
| p_reg->SHORTS = shorts_mask; |
| } |
| |
| #endif // SUPPRESS_INLINE_IMPLEMENTATION |
| |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif // NRF_TWI_H__ |
