| /* |
| * Copyright (c) 2015 - 2019, 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_TWI_H__ |
| #define NRFX_TWI_H__ |
| |
| #include <nrfx.h> |
| #include <nrfx_twi_twim.h> |
| #include <hal/nrf_twi.h> |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| /** |
| * @defgroup nrfx_twi TWI driver |
| * @{ |
| * @ingroup nrf_twi |
| * @brief Two Wire Interface master (TWI) peripheral driver. |
| */ |
| |
| /** |
| * @brief Structure for the TWI master driver instance. |
| */ |
| typedef struct |
| { |
| NRF_TWI_Type * p_twi; ///< Pointer to a structure with TWI registers. |
| uint8_t drv_inst_idx; ///< Index of the driver instance. For internal use only. |
| } nrfx_twi_t; |
| |
| /** @brief Macro for creating a TWI master driver instance. */ |
| #define NRFX_TWI_INSTANCE(id) \ |
| { \ |
| .p_twi = NRFX_CONCAT_2(NRF_TWI, id), \ |
| .drv_inst_idx = NRFX_CONCAT_3(NRFX_TWI, id, _INST_IDX), \ |
| } |
| |
| #ifndef __NRFX_DOXYGEN__ |
| enum { |
| #if NRFX_CHECK(NRFX_TWI0_ENABLED) |
| NRFX_TWI0_INST_IDX, |
| #endif |
| #if NRFX_CHECK(NRFX_TWI1_ENABLED) |
| NRFX_TWI1_INST_IDX, |
| #endif |
| NRFX_TWI_ENABLED_COUNT |
| }; |
| #endif |
| |
| /** @brief Structure for the configuration of the TWI master driver instance. */ |
| typedef struct |
| { |
| uint32_t scl; ///< SCL pin number. |
| uint32_t sda; ///< SDA pin number. |
| nrf_twi_frequency_t frequency; ///< TWI frequency. |
| uint8_t interrupt_priority; ///< Interrupt priority. |
| bool hold_bus_uninit; ///< Hold pull up state on GPIO pins after uninit. |
| } nrfx_twi_config_t; |
| |
| /** @brief The default configuration of the TWI master driver instance. */ |
| #define NRFX_TWI_DEFAULT_CONFIG \ |
| { \ |
| .frequency = (nrf_twi_frequency_t)NRFX_TWI_DEFAULT_CONFIG_FREQUENCY, \ |
| .scl = 31, \ |
| .sda = 31, \ |
| .interrupt_priority = NRFX_TWI_DEFAULT_CONFIG_IRQ_PRIORITY, \ |
| .hold_bus_uninit = NRFX_TWI_DEFAULT_CONFIG_HOLD_BUS_UNINIT, \ |
| } |
| |
| /** @brief Flag indicating that the interrupt after each transfer will be suppressed, and the event handler will not be called. */ |
| #define NRFX_TWI_FLAG_NO_XFER_EVT_HANDLER (1UL << 2) |
| /** @brief Flag indicating that the TX transfer will not end with a stop condition. */ |
| #define NRFX_TWI_FLAG_TX_NO_STOP (1UL << 5) |
| /** @brief Flag indicating that the transfer will be suspended. */ |
| #define NRFX_TWI_FLAG_SUSPEND (1UL << 6) |
| |
| /** @brief TWI master driver event types. */ |
| typedef enum |
| { |
| NRFX_TWI_EVT_DONE, ///< Transfer completed event. |
| NRFX_TWI_EVT_ADDRESS_NACK, ///< Error event: NACK received after sending the address. |
| NRFX_TWI_EVT_DATA_NACK, ///< Error event: NACK received after sending a data byte. |
| NRFX_TWI_EVT_OVERRUN ///< Error event: The unread data is replaced by new data. |
| } nrfx_twi_evt_type_t; |
| |
| /** @brief TWI master driver transfer types. */ |
| typedef enum |
| { |
| NRFX_TWI_XFER_TX, ///< TX transfer. |
| NRFX_TWI_XFER_RX, ///< RX transfer. |
| NRFX_TWI_XFER_TXRX, ///< TX transfer followed by RX transfer with repeated start. |
| NRFX_TWI_XFER_TXTX ///< TX transfer followed by TX transfer with repeated start. |
| } nrfx_twi_xfer_type_t; |
| |
| /** @brief Structure for a TWI transfer descriptor. */ |
| typedef struct |
| { |
| nrfx_twi_xfer_type_t type; ///< Type of transfer. |
| uint8_t address; ///< Slave address. |
| size_t primary_length; ///< Number of bytes transferred. |
| size_t secondary_length; ///< Number of bytes transferred. |
| uint8_t * p_primary_buf; ///< Pointer to transferred data. |
| uint8_t * p_secondary_buf; ///< Pointer to transferred data. |
| } nrfx_twi_xfer_desc_t; |
| |
| |
| /** @brief Macro for setting the TX transfer descriptor. */ |
| #define NRFX_TWI_XFER_DESC_TX(addr, p_data, length) \ |
| { \ |
| .type = NRFX_TWI_XFER_TX, \ |
| .address = (addr), \ |
| .primary_length = (length), \ |
| .secondary_length = 0, \ |
| .p_primary_buf = (p_data), \ |
| .p_secondary_buf = NULL, \ |
| } |
| |
| /** @brief Macro for setting the RX transfer descriptor. */ |
| #define NRFX_TWI_XFER_DESC_RX(addr, p_data, length) \ |
| { \ |
| .type = NRFX_TWI_XFER_RX, \ |
| .address = (addr), \ |
| .primary_length = (length), \ |
| .secondary_length = 0, \ |
| .p_primary_buf = (p_data), \ |
| .p_secondary_buf = NULL, \ |
| } |
| |
| /** @brief Macro for setting the TX-RX transfer descriptor. */ |
| #define NRFX_TWI_XFER_DESC_TXRX(addr, p_tx, tx_len, p_rx, rx_len) \ |
| { \ |
| .type = NRFX_TWI_XFER_TXRX, \ |
| .address = (addr), \ |
| .primary_length = (tx_len), \ |
| .secondary_length = (rx_len), \ |
| .p_primary_buf = (p_tx), \ |
| .p_secondary_buf = (p_rx), \ |
| } |
| |
| /** @brief Macro for setting the TX-TX transfer descriptor. */ |
| #define NRFX_TWI_XFER_DESC_TXTX(addr, p_tx, tx_len, p_tx2, tx_len2) \ |
| { \ |
| .type = NRFX_TWI_XFER_TXTX, \ |
| .address = (addr), \ |
| .primary_length = (tx_len), \ |
| .secondary_length = (tx_len2), \ |
| .p_primary_buf = (p_tx), \ |
| .p_secondary_buf = (p_tx2), \ |
| } |
| |
| /** @brief Structure for a TWI event. */ |
| typedef struct |
| { |
| nrfx_twi_evt_type_t type; ///< Event type. |
| nrfx_twi_xfer_desc_t xfer_desc; ///< Transfer details. |
| } nrfx_twi_evt_t; |
| |
| /** @brief TWI event handler prototype. */ |
| typedef void (* nrfx_twi_evt_handler_t)(nrfx_twi_evt_t const * p_event, |
| void * p_context); |
| |
| /** |
| * @brief Function for initializing the TWI driver instance. |
| * |
| * @param[in] p_instance Pointer to the driver instance structure. |
| * @param[in] p_config Pointer to the structure with the initial configuration. |
| * @param[in] event_handler Event handler provided by the user. If NULL, blocking mode is enabled. |
| * @param[in] p_context Context passed to event handler. |
| * |
| * @retval NRFX_SUCCESS Initialization is successful. |
| * @retval NRFX_ERROR_INVALID_STATE The driver is in invalid state. |
| * @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_twi_init(nrfx_twi_t const * p_instance, |
| nrfx_twi_config_t const * p_config, |
| nrfx_twi_evt_handler_t event_handler, |
| void * p_context); |
| |
| /** |
| * @brief Function for uninitializing the TWI instance. |
| * |
| * @param[in] p_instance Pointer to the driver instance structure. |
| */ |
| void nrfx_twi_uninit(nrfx_twi_t const * p_instance); |
| |
| /** |
| * @brief Function for enabling the TWI instance. |
| * |
| * @param[in] p_instance Pointer to the driver instance structure. |
| */ |
| void nrfx_twi_enable(nrfx_twi_t const * p_instance); |
| |
| /** |
| * @brief Function for disabling the TWI instance. |
| * |
| * @param[in] p_instance Pointer to the driver instance structure. |
| */ |
| void nrfx_twi_disable(nrfx_twi_t const * p_instance); |
| |
| /** |
| * @brief Function for sending data to a TWI slave. |
| * |
| * The transmission will be stopped when an error occurs. If a transfer is ongoing, |
| * the function returns the error code @ref NRFX_ERROR_BUSY. |
| * |
| * @note This function is deprecated. Use @ref nrfx_twi_xfer instead. |
| * |
| * @param[in] p_instance Pointer to the driver instance structure. |
| * @param[in] address Address of a specific slave device (only 7 LSB). |
| * @param[in] p_data Pointer to a transmit buffer. |
| * @param[in] length Number of bytes to send. |
| * @param[in] no_stop If set, the stop condition is not generated on the bus |
| * after the transfer has completed successfully (allowing |
| * for a repeated start in the next transfer). |
| * |
| * @retval NRFX_SUCCESS The procedure is successful. |
| * @retval NRFX_ERROR_BUSY The driver is not ready for a new transfer. |
| * @retval NRFX_ERROR_INTERNAL An error is detected by hardware. |
| * @retval NRFX_ERROR_INVALID_STATE RX transaction is suspended on bus. |
| * @retval NRFX_ERROR_DRV_TWI_ERR_ANACK Negative acknowledgement (NACK) is received after sending |
| * the address in polling mode. |
| * @retval NRFX_ERROR_DRV_TWI_ERR_DNACK Negative acknowledgement (NACK) is received after sending |
| * a data byte in polling mode. |
| */ |
| nrfx_err_t nrfx_twi_tx(nrfx_twi_t const * p_instance, |
| uint8_t address, |
| uint8_t const * p_data, |
| size_t length, |
| bool no_stop); |
| |
| /** |
| * @brief Function for reading data from a TWI slave. |
| * |
| * The transmission will be stopped when an error occurs. If a transfer is ongoing, |
| * the function returns the error code @ref NRFX_ERROR_BUSY. |
| * |
| * @note This function is deprecated. Use @ref nrfx_twi_xfer instead. |
| * |
| * @param[in] p_instance Pointer to the driver instance structure. |
| * @param[in] address Address of a specific slave device (only 7 LSB). |
| * @param[in] p_data Pointer to a receive buffer. |
| * @param[in] length Number of bytes to be received. |
| * |
| * @retval NRFX_SUCCESS The procedure is successful. |
| * @retval NRFX_ERROR_BUSY The driver is not ready for a new transfer. |
| * @retval NRFX_ERROR_INTERNAL An error is detected by hardware. |
| * @retval NRFX_ERROR_INVALID_STATE TX transaction is suspended on bus. |
| * @retval NRFX_ERROR_DRV_TWI_ERR_OVERRUN The unread data is replaced by new data. |
| * @retval NRFX_ERROR_DRV_TWI_ERR_ANACK Negative acknowledgement (NACK) is received after sending |
| * the address in polling mode. |
| * @retval NRFX_ERROR_DRV_TWI_ERR_DNACK Negative acknowledgement (NACK) is received after sending |
| * a data byte in polling mode. |
| */ |
| nrfx_err_t nrfx_twi_rx(nrfx_twi_t const * p_instance, |
| uint8_t address, |
| uint8_t * p_data, |
| size_t length); |
| |
| |
| /** |
| * @brief Function for performing a TWI transfer. |
| * |
| * The following transfer types can be configured (@ref nrfx_twi_xfer_desc_t::type): |
| * - @ref NRFX_TWI_XFER_TXRX - Write operation followed by a read operation (without STOP condition in between). |
| * - @ref NRFX_TWI_XFER_TXTX - Write operation followed by a write operation (without STOP condition in between). |
| * - @ref NRFX_TWI_XFER_TX - Write operation (with or without STOP condition). |
| * - @ref NRFX_TWI_XFER_RX - Read operation (with STOP condition). |
| * |
| * @note TX-RX and TX-TX transfers are supported only in non-blocking mode. |
| * |
| * Additional options are provided using the flags parameter: |
| * - @ref NRFX_TWI_FLAG_NO_XFER_EVT_HANDLER - No user event handler after transfer completion. In most cases, this also means no interrupt at the end of the transfer. |
| * - @ref NRFX_TWI_FLAG_TX_NO_STOP - No stop condition after TX transfer. |
| * - @ref NRFX_TWI_FLAG_SUSPEND - Transfer will be suspended. This allows for combining multiple transfers into one transaction. |
| * Only transactions with the same direction can be combined. To finish the transaction, call the function without this flag. |
| * |
| * @note |
| * Some flag combinations are invalid: |
| * - @ref NRFX_TWI_FLAG_TX_NO_STOP with @ref nrfx_twi_xfer_desc_t::type different than @ref NRFX_TWI_XFER_TX |
| * |
| * @param[in] p_instance Pointer to the driver instance structure. |
| * @param[in] p_xfer_desc Pointer to the transfer descriptor. |
| * @param[in] flags Transfer options (0 for default settings). |
| * |
| * @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. |
| * @retval NRFX_ERROR_INTERNAL An error is detected by hardware. |
| * @retval NRFX_ERROR_INVALID_STATE Other direction of transaction is suspended on the bus. |
| * @retval NRFX_ERROR_DRV_TWI_ERR_OVERRUN The unread data is replaced by new data (TXRX and RX) |
| * @retval NRFX_ERROR_DRV_TWI_ERR_ANACK Negative acknowledgement (NACK) is received after sending |
| * the address in polling mode. |
| * @retval NRFX_ERROR_DRV_TWI_ERR_DNACK Negative acknowledgement (NACK) is received after sending |
| * a data byte in polling mode. |
| */ |
| nrfx_err_t nrfx_twi_xfer(nrfx_twi_t const * p_instance, |
| nrfx_twi_xfer_desc_t const * p_xfer_desc, |
| uint32_t flags); |
| |
| /** |
| * @brief Function for checking the TWI driver state. |
| * |
| * @param[in] p_instance TWI instance. |
| * |
| * @retval true The TWI driver is currently busy performing a transfer. |
| * @retval false The TWI driver is ready for a new transfer. |
| */ |
| bool nrfx_twi_is_busy(nrfx_twi_t const * p_instance); |
| |
| /** |
| * @brief Function for getting the transferred data count. |
| * |
| * @param[in] p_instance Pointer to the driver instance structure. |
| * |
| * @return Data count. |
| */ |
| size_t nrfx_twi_data_count_get(nrfx_twi_t const * const p_instance); |
| |
| /** |
| * @brief Function for returning the address of a STOPPED TWI event. |
| * |
| * A STOPPED event can be used to detect the end of a transfer if the @ref NRFX_TWI_FLAG_NO_XFER_EVT_HANDLER |
| * option is used. |
| * |
| * @param[in] p_instance Pointer to the driver instance structure. |
| * |
| * @return STOPPED event address. |
| */ |
| uint32_t nrfx_twi_stopped_event_get(nrfx_twi_t const * p_instance); |
| |
| /** |
| * @brief Function for recovering the bus. |
| * |
| * This function checks if the bus is not stuck because of a slave holding the SDA line in the low state, |
| * and if needed it performs required number of pulses on the SCL line to make the slave release the SDA line. |
| * Finally, the function generates a STOP condition on the bus to put it into a known state. |
| * |
| * @note This function can be used only if the TWI driver is uninitialized. |
| * |
| * @param[in] scl_pin SCL pin number. |
| * @param[in] sda_pin SDA pin number. |
| * |
| * @retval NRFX_SUCCESS Bus recovery was successful. |
| * @retval NRFX_ERROR_INTERNAL Bus recovery failed. |
| */ |
| __STATIC_INLINE nrfx_err_t nrfx_twi_bus_recover(uint32_t scl_pin, uint32_t sda_pin); |
| |
| #ifndef SUPPRESS_INLINE_IMPLEMENTATION |
| __STATIC_INLINE nrfx_err_t nrfx_twi_bus_recover(uint32_t scl_pin, uint32_t sda_pin) |
| { |
| return nrfx_twi_twim_bus_recover(scl_pin, sda_pin); |
| } |
| #endif |
| |
| /** @} */ |
| |
| |
| void nrfx_twi_0_irq_handler(void); |
| void nrfx_twi_1_irq_handler(void); |
| |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif // NRFX_TWI_H__ |