/** * Copyright (c) 2015 - 2018, 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 NRFX_SPIS_H__ #define NRFX_SPIS_H__ #include #include #include #ifdef __cplusplus extern "C" { #endif /** * @defgroup nrfx_spis SPI slave driver * @{ * @ingroup nrf_spis * @brief SPI Slave peripheral driver. */ /** @brief SPI slave driver instance data structure. */ typedef struct { NRF_SPIS_Type * p_reg; //!< Pointer to a structure with SPIS registers. uint8_t drv_inst_idx; //!< Driver instance index. } nrfx_spis_t; enum { #if NRFX_CHECK(NRFX_SPIS0_ENABLED) NRFX_SPIS0_INST_IDX, #endif #if NRFX_CHECK(NRFX_SPIS1_ENABLED) NRFX_SPIS1_INST_IDX, #endif #if NRFX_CHECK(NRFX_SPIS2_ENABLED) NRFX_SPIS2_INST_IDX, #endif NRFX_SPIS_ENABLED_COUNT }; /** @brief Macro for creating an SPI slave driver instance. */ #define NRFX_SPIS_INSTANCE(id) \ { \ .p_reg = NRFX_CONCAT_2(NRF_SPIS, id), \ .drv_inst_idx = NRFX_CONCAT_3(NRFX_SPIS, id, _INST_IDX), \ } /** * @brief This value can be provided instead of a pin number for the signals MOSI * and MISO to specify that the given signal is not used and therefore * does not need to be connected to a pin. */ #define NRFX_SPIS_PIN_NOT_USED 0xFF /** @brief Default pull-up configuration of the SPI CS. */ #define NRFX_SPIS_DEFAULT_CSN_PULLUP NRF_GPIO_PIN_NOPULL /** @brief Default drive configuration of the SPI MISO. */ #define NRFX_SPIS_DEFAULT_MISO_DRIVE NRF_GPIO_PIN_S0S1 /** @brief SPI slave driver event types. */ typedef enum { NRFX_SPIS_BUFFERS_SET_DONE, //!< Memory buffer set event. Memory buffers have been set successfully to the SPI slave device, and SPI transaction can be done. NRFX_SPIS_XFER_DONE, //!< SPI transaction event. SPI transaction has been completed. NRFX_SPIS_EVT_TYPE_MAX //!< Enumeration upper bound. } nrfx_spis_evt_type_t; /** @brief SPI slave driver event structure. */ typedef struct { nrfx_spis_evt_type_t evt_type; //!< Type of the event. size_t rx_amount; //!< Number of bytes received in the last transaction. This parameter is only valid for @ref NRFX_SPIS_XFER_DONE events. size_t tx_amount; //!< Number of bytes transmitted in the last transaction. This parameter is only valid for @ref NRFX_SPIS_XFER_DONE events. } nrfx_spis_evt_t; /** @brief SPI slave instance default configuration. */ #define NRFX_SPIS_DEFAULT_CONFIG \ { \ .sck_pin = NRFX_SPIS_PIN_NOT_USED, \ .mosi_pin = NRFX_SPIS_PIN_NOT_USED, \ .miso_pin = NRFX_SPIS_PIN_NOT_USED, \ .csn_pin = NRFX_SPIS_PIN_NOT_USED, \ .mode = NRF_SPIS_MODE_0, \ .bit_order = NRF_SPIS_BIT_ORDER_MSB_FIRST, \ .csn_pullup = NRFX_SPIS_DEFAULT_CSN_PULLUP, \ .miso_drive = NRFX_SPIS_DEFAULT_MISO_DRIVE, \ .def = NRFX_SPIS_DEFAULT_DEF, \ .orc = NRFX_SPIS_DEFAULT_ORC, \ .irq_priority = NRFX_SPIS_DEFAULT_CONFIG_IRQ_PRIORITY, \ } /** @brief SPI peripheral device configuration data. */ typedef struct { uint32_t miso_pin; //!< SPI MISO pin (optional). /**< Set @ref NRFX_SPIS_PIN_NOT_USED * if this signal is not needed. */ uint32_t mosi_pin; //!< SPI MOSI pin (optional). /**< Set @ref NRFX_SPIS_PIN_NOT_USED * if this signal is not needed. */ uint32_t sck_pin; //!< SPI SCK pin. uint32_t csn_pin; //!< SPI CSN pin. nrf_spis_mode_t mode; //!< SPI mode. nrf_spis_bit_order_t bit_order; //!< SPI transaction bit order. nrf_gpio_pin_pull_t csn_pullup; //!< CSN pin pull-up configuration. nrf_gpio_pin_drive_t miso_drive; //!< MISO pin drive configuration. uint8_t def; //!< Character clocked out in case of an ignored transaction. uint8_t orc; //!< Character clocked out after an over-read of the transmit buffer. uint8_t irq_priority; //!< Interrupt priority. } nrfx_spis_config_t; /** * @brief SPI slave driver event handler type. * * @param[in] p_event Pointer to the event structure. The structure is * allocated on the stack so it is valid only until * the event handler returns. * @param[in] p_context Context set on initialization. */ typedef void (*nrfx_spis_event_handler_t)(nrfx_spis_evt_t const * p_event, void * p_context); /** * @brief Function for initializing the SPI slave driver instance. * * @note When the nRF52 Anomaly 109 workaround for SPIS is enabled, this function * initializes the GPIOTE driver as well, and uses one of GPIOTE channels * to detect falling edges on CSN pin. * * @param[in] p_instance Pointer to the driver instance structure. * @param[in] p_config Pointer to the structure with initial configuration. * @param[in] event_handler Function to be called by the SPI slave driver upon event. * Must not be NULL. * @param[in] p_context Context passed to the event handler. * * @retval NRFX_SUCCESS If the initialization was successful. * @retval NRFX_ERROR_INVALID_STATE If the instance is already initialized. * @retval NRFX_ERROR_INVALID_PARAM If an invalid parameter is supplied. * @retval NRFX_ERROR_BUSY If some other peripheral with the same * instance ID is already in use. This is * possible only if @ref nrfx_prs module * is enabled. * @retval NRFX_ERROR_INTERNAL GPIOTE channel for detecting falling edges * on CSN pin cannot be initialized. Possible * only when using nRF52 Anomaly 109 workaround. */ nrfx_err_t nrfx_spis_init(nrfx_spis_t const * const p_instance, nrfx_spis_config_t const * p_config, nrfx_spis_event_handler_t event_handler, void * p_context); /** * @brief Function for uninitializing the SPI slave driver instance. * * @param[in] p_instance Pointer to the driver instance structure. */ void nrfx_spis_uninit(nrfx_spis_t const * const p_instance); /** * @brief Function for preparing the SPI slave instance for a single SPI transaction. * * This function prepares the SPI slave device to be ready for a single SPI transaction. It configures * the SPI slave device to use the memory supplied with the function call in SPI transactions. * * When either the memory buffer configuration or the SPI transaction has been * completed, the event callback function will be called with the appropriate event * @ref nrfx_spis_evt_type_t. Note that the callback function can be called before returning from * this function, because it is called from the SPI slave interrupt context. * * @note This function can be called from the callback function context. * * @note Client applications must call this function after every @ref NRFX_SPIS_XFER_DONE event if * the SPI slave driver should be prepared for a possible new SPI transaction. * * @note Peripherals using EasyDMA (including SPIS) require the transfer buffers * to be placed in the Data RAM region. If this condition is not met, * this function will fail with the error code NRFX_ERROR_INVALID_ADDR. * * @param[in] p_instance Pointer to the driver instance structure. * @param[in] p_tx_buffer Pointer to the TX buffer. Can be NULL when the buffer length is zero. * @param[in] p_rx_buffer Pointer to the RX buffer. Can be NULL when the buffer length is zero. * @param[in] tx_buffer_length Length of the TX buffer in bytes. * @param[in] rx_buffer_length Length of the RX buffer in bytes. * * @retval NRFX_SUCCESS If the operation was successful. * @retval NRFX_ERROR_INVALID_STATE If the operation failed because the SPI slave device is in an incorrect state. * @retval NRFX_ERROR_INVALID_ADDR If the provided buffers are not placed in the Data * RAM region. * @retval NRFX_ERROR_INVALID_LENGTH If provided lengths exceed the EasyDMA limits for the peripheral. * @retval NRFX_ERROR_INTERNAL If the operation failed because of an internal error. */ nrfx_err_t nrfx_spis_buffers_set(nrfx_spis_t const * const p_instance, uint8_t const * p_tx_buffer, size_t tx_buffer_length, uint8_t * p_rx_buffer, size_t rx_buffer_length); void nrfx_spis_0_irq_handler(void); void nrfx_spis_1_irq_handler(void); void nrfx_spis_2_irq_handler(void); /** @} */ #ifdef __cplusplus } #endif #endif // NRFX_SPIS_H__