/* * 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 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 the copyright holder 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 NRFX_SPI_H__ #define NRFX_SPI_H__ #include #include #include #ifdef __cplusplus extern "C" { #endif /** * @defgroup nrfx_spi SPI driver * @{ * @ingroup nrf_spi * @brief Serial Peripheral Interface master (SPI) driver. */ /** @brief Data structure of the Serial Peripheral Interface master (SPI) driver instance. */ typedef struct { NRF_SPI_Type * p_reg; ///< Pointer to a structure with SPI registers. uint8_t drv_inst_idx; ///< Index of the driver instance. For internal use only. } nrfx_spi_t; #ifndef __NRFX_DOXYGEN__ enum { #if NRFX_CHECK(NRFX_SPI0_ENABLED) NRFX_SPI0_INST_IDX, #endif #if NRFX_CHECK(NRFX_SPI1_ENABLED) NRFX_SPI1_INST_IDX, #endif #if NRFX_CHECK(NRFX_SPI2_ENABLED) NRFX_SPI2_INST_IDX, #endif NRFX_SPI_ENABLED_COUNT }; #endif /** @brief Macro for creating an instance of the SPI master driver. */ #define NRFX_SPI_INSTANCE(id) \ { \ .p_reg = NRFX_CONCAT_2(NRF_SPI, id), \ .drv_inst_idx = NRFX_CONCAT_3(NRFX_SPI, id, _INST_IDX), \ } /** * @brief This value can be provided instead of a pin number for signals MOSI, * MISO, and Slave Select to specify that the given signal is not used and * therefore does not need to be connected to a pin. */ #define NRFX_SPI_PIN_NOT_USED 0xFF /** @brief Configuration structure of the SPI master driver instance. */ typedef struct { uint8_t sck_pin; ///< SCK pin number. uint8_t mosi_pin; ///< MOSI pin number (optional). /**< Set to @ref NRFX_SPI_PIN_NOT_USED * if this signal is not needed. */ uint8_t miso_pin; ///< MISO pin number (optional). /**< Set to @ref NRFX_SPI_PIN_NOT_USED * if this signal is not needed. */ uint8_t ss_pin; ///< Slave Select pin number (optional). /**< Set to @ref NRFX_SPI_PIN_NOT_USED * if this signal is not needed. The driver * supports only active low for this signal. * If the signal must be active high, * it must be controlled externally. */ uint8_t irq_priority; ///< Interrupt priority. uint8_t orc; ///< Overrun character. /**< This character is used when all bytes from the TX buffer are sent, but the transfer continues due to RX. */ nrf_spi_frequency_t frequency; ///< SPI frequency. nrf_spi_mode_t mode; ///< SPI mode. nrf_spi_bit_order_t bit_order; ///< SPI bit order. nrf_gpio_pin_pull_t miso_pull; ///< MISO pull up configuration. } nrfx_spi_config_t; /** * @brief SPI master instance default configuration. * This configuration sets up SPI with the following options: * - over-run character set to 0xFF * - clock frequency 4 MHz * - mode 0 enabled (SCK active high, sample on leading edge of clock) * - MSB shifted out first * - MISO pull-up disabled * * @param[in] _pin_sck SCK pin. * @param[in] _pin_mosi MOSI pin. * @param[in] _pin_miso MISO pin. * @param[in] _pin_ss SS pin. */ #define NRFX_SPI_DEFAULT_CONFIG(_pin_sck, _pin_mosi, _pin_miso, _pin_ss) \ { \ .sck_pin = _pin_sck, \ .mosi_pin = _pin_mosi, \ .miso_pin = _pin_miso, \ .ss_pin = _pin_ss, \ .irq_priority = NRFX_SPI_DEFAULT_CONFIG_IRQ_PRIORITY, \ .orc = 0xFF, \ .frequency = NRF_SPI_FREQ_4M, \ .mode = NRF_SPI_MODE_0, \ .bit_order = NRF_SPI_BIT_ORDER_MSB_FIRST, \ .miso_pull = NRF_GPIO_PIN_NOPULL, \ } /** @brief Single transfer descriptor structure. */ typedef struct { uint8_t const * p_tx_buffer; ///< Pointer to TX buffer. size_t tx_length; ///< TX buffer length. uint8_t * p_rx_buffer; ///< Pointer to RX buffer. size_t rx_length; ///< RX buffer length. }nrfx_spi_xfer_desc_t; /** * @brief Macro for setting up single transfer descriptor. * * This macro is for internal use only. */ #define NRFX_SPI_SINGLE_XFER(p_tx, tx_len, p_rx, rx_len) \ { \ .p_tx_buffer = (uint8_t const *)(p_tx), \ .tx_length = (tx_len), \ .p_rx_buffer = (p_rx), \ .rx_length = (rx_len), \ } /** @brief Macro for setting the duplex TX RX transfer. */ #define NRFX_SPI_XFER_TRX(p_tx_buf, tx_length, p_rx_buf, rx_length) \ NRFX_SPI_SINGLE_XFER(p_tx_buf, tx_length, p_rx_buf, rx_length) /** @brief Macro for setting the TX transfer. */ #define NRFX_SPI_XFER_TX(p_buf, length) \ NRFX_SPI_SINGLE_XFER(p_buf, length, NULL, 0) /** @brief Macro for setting the RX transfer. */ #define NRFX_SPI_XFER_RX(p_buf, length) \ NRFX_SPI_SINGLE_XFER(NULL, 0, p_buf, length) /** * @brief SPI master driver event types, passed to the handler routine provided * during initialization. */ typedef enum { NRFX_SPI_EVENT_DONE, ///< Transfer done. } nrfx_spi_evt_type_t; /** @brief SPI master event description with transmission details. */ typedef struct { nrfx_spi_evt_type_t type; ///< Event type. nrfx_spi_xfer_desc_t xfer_desc; ///< Transfer details. } nrfx_spi_evt_t; /** @brief SPI master driver event handler type. */ typedef void (* nrfx_spi_evt_handler_t)(nrfx_spi_evt_t const * p_event, void * p_context); /** * @brief Function for initializing the SPI master driver instance. * * This function configures and enables the specified peripheral. * * @param[in] p_instance Pointer to the driver instance structure. * @param[in] p_config Pointer to the structure with the initial configuration. * @param[in] handler Event handler provided by the user. If NULL, transfers * will be performed in blocking mode. * @param[in] p_context Context passed to the event handler. * * @retval NRFX_SUCCESS Initialization was successful. * @retval NRFX_ERROR_INVALID_STATE The driver was already initialized. * @retval NRFX_ERROR_BUSY Some other peripheral with the same * instance ID is already in use. This is * possible only if @ref nrfx_prs module * is enabled. */ nrfx_err_t nrfx_spi_init(nrfx_spi_t const * p_instance, nrfx_spi_config_t const * p_config, nrfx_spi_evt_handler_t handler, void * p_context); /** * @brief Function for uninitializing the SPI master driver instance. * * @param[in] p_instance Pointer to the driver instance structure. */ void nrfx_spi_uninit(nrfx_spi_t const * p_instance); /** * @brief Function for starting the SPI data transfer. * * If an event handler was provided in the @ref nrfx_spi_init call, this function * returns immediately and the handler is called when the transfer is done. * Otherwise, the transfer is performed in blocking mode, which means that this function * returns when the transfer is finished. * * @param p_instance Pointer to the driver instance structure. * @param p_xfer_desc Pointer to the transfer descriptor. * @param flags Transfer options (0 for default settings). * Currently, no additional flags are available. * * @retval NRFX_SUCCESS The procedure is successful. * @retval NRFX_ERROR_BUSY The driver is not ready for a new transfer. * @retval NRFX_ERROR_NOT_SUPPORTED The provided parameters are not supported. */ nrfx_err_t nrfx_spi_xfer(nrfx_spi_t const * p_instance, nrfx_spi_xfer_desc_t const * p_xfer_desc, uint32_t flags); /** * @brief Function for aborting the ongoing transfer. * * @param[in] p_instance Pointer to the driver instance structure. */ void nrfx_spi_abort(nrfx_spi_t const * p_instance); /** @} */ void nrfx_spi_0_irq_handler(void); void nrfx_spi_1_irq_handler(void); void nrfx_spi_2_irq_handler(void); #ifdef __cplusplus } #endif #endif // NRFX_SPI_H__