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Diffstat (limited to 'drivers_nrf/hal/nrf_twi.h')
| -rw-r--r-- | drivers_nrf/hal/nrf_twi.h | 452 |
1 files changed, 452 insertions, 0 deletions
diff --git a/drivers_nrf/hal/nrf_twi.h b/drivers_nrf/hal/nrf_twi.h new file mode 100644 index 0000000..5e80272 --- /dev/null +++ b/drivers_nrf/hal/nrf_twi.h @@ -0,0 +1,452 @@ +/** + * 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, 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__ + +/** + * @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__ |