| /** |
| * 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 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_TWIM_H__ |
| #define NRFX_TWIM_H__ |
| |
| #include <nrfx.h> |
| #include <hal/nrf_twim.h> |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| /** |
| * @defgroup nrfx_twim TWIM driver |
| * @{ |
| * @ingroup nrf_twim |
| * @brief TWIM peripheral driver. |
| */ |
| |
| /** |
| * @brief Structure for the TWI master driver instance. |
| */ |
| typedef struct |
| { |
| NRF_TWIM_Type * p_twim; ///< Pointer to a structure with TWIM registers. |
| uint8_t drv_inst_idx; ///< Driver instance index. |
| } nrfx_twim_t; |
| |
| /** |
| * @brief Macro for creating a TWI master driver instance. |
| */ |
| #define NRFX_TWIM_INSTANCE(id) \ |
| { \ |
| .p_twim = NRFX_CONCAT_2(NRF_TWIM, id), \ |
| .drv_inst_idx = NRFX_CONCAT_3(NRFX_TWIM, id, _INST_IDX), \ |
| } |
| |
| enum { |
| #if NRFX_CHECK(NRFX_TWIM0_ENABLED) |
| NRFX_TWIM0_INST_IDX, |
| #endif |
| #if NRFX_CHECK(NRFX_TWIM1_ENABLED) |
| NRFX_TWIM1_INST_IDX, |
| #endif |
| NRFX_TWIM_ENABLED_COUNT |
| }; |
| |
| /** |
| * @brief Structure for the TWI master driver instance configuration. |
| */ |
| typedef struct |
| { |
| uint32_t scl; ///< SCL pin number. |
| uint32_t sda; ///< SDA pin number. |
| nrf_twim_frequency_t frequency; ///< TWIM frequency. |
| uint8_t interrupt_priority; ///< Interrupt priority. |
| bool hold_bus_uninit; ///< Hold pull up state on gpio pins after uninit. |
| } nrfx_twim_config_t; |
| |
| /** |
| * @brief TWI master driver instance default configuration. |
| */ |
| #define NRFX_TWIM_DEFAULT_CONFIG \ |
| { \ |
| .frequency = (nrf_twim_frequency_t)NRFX_TWIM_DEFAULT_CONFIG_FREQUENCY, \ |
| .scl = 31, \ |
| .sda = 31, \ |
| .interrupt_priority = NRFX_TWIM_DEFAULT_CONFIG_IRQ_PRIORITY, \ |
| .hold_bus_uninit = NRFX_TWIM_DEFAULT_CONFIG_HOLD_BUS_UNINIT, \ |
| } |
| |
| #define NRFX_TWIM_FLAG_TX_POSTINC (1UL << 0) /**< TX buffer address incremented after transfer. */ |
| #define NRFX_TWIM_FLAG_RX_POSTINC (1UL << 1) /**< RX buffer address incremented after transfer. */ |
| #define NRFX_TWIM_FLAG_NO_XFER_EVT_HANDLER (1UL << 2) /**< Interrupt after each transfer is suppressed, and the event handler is not called. */ |
| #define NRFX_TWIM_FLAG_HOLD_XFER (1UL << 3) /**< Set up the transfer but do not start it. */ |
| #define NRFX_TWIM_FLAG_REPEATED_XFER (1UL << 4) /**< Flag indicating that the transfer will be executed multiple times. */ |
| #define NRFX_TWIM_FLAG_TX_NO_STOP (1UL << 5) /**< Flag indicating that the TX transfer will not end with a stop condition. */ |
| |
| /** |
| * @brief TWI master driver event types. |
| */ |
| typedef enum |
| { |
| NRFX_TWIM_EVT_DONE, ///< Transfer completed event. |
| NRFX_TWIM_EVT_ADDRESS_NACK, ///< Error event: NACK received after sending the address. |
| NRFX_TWIM_EVT_DATA_NACK ///< Error event: NACK received after sending a data byte. |
| } nrfx_twim_evt_type_t; |
| |
| /** |
| * @brief TWI master driver transfer types. |
| */ |
| typedef enum |
| { |
| NRFX_TWIM_XFER_TX, ///< TX transfer. |
| NRFX_TWIM_XFER_RX, ///< RX transfer. |
| NRFX_TWIM_XFER_TXRX, ///< TX transfer followed by RX transfer with repeated start. |
| NRFX_TWIM_XFER_TXTX ///< TX transfer followed by TX transfer with repeated start. |
| } nrfx_twim_xfer_type_t; |
| |
| /** |
| * @brief Structure for a TWI transfer descriptor. |
| */ |
| typedef struct |
| { |
| nrfx_twim_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_twim_xfer_desc_t; |
| |
| |
| /**@brief Macro for setting the TX transfer descriptor. */ |
| #define NRFX_TWIM_XFER_DESC_TX(addr, p_data, length) \ |
| { \ |
| .type = NRFX_TWIM_XFER_TX, \ |
| .address = addr, \ |
| .primary_length = length, \ |
| .p_primary_buf = p_data, \ |
| } |
| |
| /**@brief Macro for setting the RX transfer descriptor. */ |
| #define NRFX_TWIM_XFER_DESC_RX(addr, p_data, length) \ |
| { \ |
| .type = NRFX_TWIM_XFER_RX, \ |
| .address = addr, \ |
| .primary_length = length, \ |
| .p_primary_buf = p_data, \ |
| } |
| |
| /**@brief Macro for setting the TXRX transfer descriptor. */ |
| #define NRFX_TWIM_XFER_DESC_TXRX(addr, p_tx, tx_len, p_rx, rx_len) \ |
| { \ |
| .type = NRFX_TWIM_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 TXTX transfer descriptor. */ |
| #define NRFX_TWIM_XFER_DESC_TXTX(addr, p_tx, tx_len, p_tx2, tx_len2) \ |
| { \ |
| .type = NRFX_TWIM_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_twim_evt_type_t type; ///< Event type. |
| nrfx_twim_xfer_desc_t xfer_desc; ///< Transfer details. |
| } nrfx_twim_evt_t; |
| |
| /** |
| * @brief TWI event handler prototype. |
| */ |
| typedef void (* nrfx_twim_evt_handler_t)(nrfx_twim_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 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 If initialization was successful. |
| * @retval NRFX_ERROR_INVALID_STATE If the driver is in invalid state. |
| * @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. |
| */ |
| nrfx_err_t nrfx_twim_init(nrfx_twim_t const * p_instance, |
| nrfx_twim_config_t const * p_config, |
| nrfx_twim_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_twim_uninit(nrfx_twim_t const * p_instance); |
| |
| /** |
| * @brief Function for enabling the TWI instance. |
| * |
| * @param[in] p_instance Pointer to the driver instance structure. |
| */ |
| void nrfx_twim_enable(nrfx_twim_t const * p_instance); |
| |
| /** |
| * @brief Function for disabling the TWI instance. |
| * |
| * @param[in] p_instance Pointer to the driver instance structure. |
| */ |
| void nrfx_twim_disable(nrfx_twim_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 Peripherals using EasyDMA (including TWIM) 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] 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. Maximum possible length is |
| * dependent on the used SoC (see the MAXCNT register |
| * description in the Product Specification). The driver |
| * checks it with assertion. |
| * @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 If the procedure was successful. |
| * @retval NRFX_ERROR_BUSY If the driver is not ready for a new transfer. |
| * @retval NRFX_ERROR_INTERNAL If an error was detected by hardware. |
| * @retval NRFX_ERROR_INVALID_ADDR If the provided buffer is not placed in the Data RAM region. |
| * @retval NRFX_ERROR_DRV_TWI_ERR_ANACK If NACK received after sending the address in polling mode. |
| * @retval NRFX_ERROR_DRV_TWI_ERR_DNACK If NACK received after sending a data byte in polling mode. |
| */ |
| nrfx_err_t nrfx_twim_tx(nrfx_twim_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. |
| * |
| * @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. Maximum possible length |
| * is dependent on the used SoC (see the MAXCNT register |
| * description in the Product Specification). The driver |
| * checks it with assertion. |
| * |
| * @retval NRFX_SUCCESS If the procedure was successful. |
| * @retval NRFX_ERROR_BUSY If the driver is not ready for a new transfer. |
| * @retval NRFX_ERROR_INTERNAL If an error was detected by hardware. |
| * @retval NRFX_ERROR_DRV_TWI_ERR_ANACK If NACK received after sending the address in polling mode. |
| * @retval NRFX_ERROR_DRV_TWI_ERR_DNACK If NACK received after sending a data byte in polling mode. |
| */ |
| nrfx_err_t nrfx_twim_rx(nrfx_twim_t const * p_instance, |
| uint8_t address, |
| uint8_t * p_data, |
| size_t length); |
| |
| /** |
| * @brief Function for preparing a TWI transfer. |
| * |
| * The following transfer types can be configured (@ref nrfx_twim_xfer_desc_t::type): |
| * - @ref NRFX_TWIM_XFER_TXRX<span></span>: Write operation followed by a read operation (without STOP condition in between). |
| * - @ref NRFX_TWIM_XFER_TXTX<span></span>: Write operation followed by a write operation (without STOP condition in between). |
| * - @ref NRFX_TWIM_XFER_TX<span></span>: Write operation (with or without STOP condition). |
| * - @ref NRFX_TWIM_XFER_RX<span></span>: Read operation (with STOP condition). |
| * |
| * @note TXRX and TXTX transfers are supported only in non-blocking mode. |
| * |
| * Additional options are provided using the flags parameter: |
| * - @ref NRFX_TWIM_FLAG_TX_POSTINC and @ref NRFX_TWIM_FLAG_RX_POSTINC<span></span>: Post-incrementation of buffer addresses. Supported only by TWIM. |
| * - @ref NRFX_TWIM_FLAG_NO_XFER_EVT_HANDLER<span></span>: No user event handler after transfer completion. In most cases, this also means no interrupt at the end of the transfer. |
| * - @ref NRFX_TWIM_FLAG_HOLD_XFER<span></span>: Driver is not starting the transfer. Use this flag if the transfer is triggered externally by PPI. Supported only by TWIM. |
| * Use @ref nrfx_twim_start_task_get to get the address of the start task. |
| * - @ref NRFX_TWIM_FLAG_REPEATED_XFER<span></span>: Prepare for repeated transfers. You can set up a number of transfers that will be triggered externally (for example by PPI). |
| * An example is a TXRX transfer with the options @ref NRFX_TWIM_FLAG_RX_POSTINC, @ref NRFX_TWIM_FLAG_NO_XFER_EVT_HANDLER, and @ref NRFX_TWIM_FLAG_REPEATED_XFER. |
| * After the transfer is set up, a set of transfers can be triggered by PPI that will read, for example, the same register of an |
| * external component and put it into a RAM buffer without any interrupts. @ref nrfx_twim_stopped_event_get can be used to get the |
| * address of the STOPPED event, which can be used to count the number of transfers. If @ref NRFX_TWIM_FLAG_REPEATED_XFER is used, |
| * the driver does not set the driver instance into busy state, so you must ensure that the next transfers are set up |
| * when TWIM is not active. Supported only by TWIM. |
| * - @ref NRFX_TWIM_FLAG_TX_NO_STOP<span></span>: No stop condition after TX transfer. |
| * |
| * @note |
| * Some flag combinations are invalid: |
| * - @ref NRFX_TWIM_FLAG_TX_NO_STOP with @ref nrfx_twim_xfer_desc_t::type different than @ref NRFX_TWIM_XFER_TX |
| * - @ref NRFX_TWIM_FLAG_REPEATED_XFER with @ref nrfx_twim_xfer_desc_t::type set to @ref NRFX_TWIM_XFER_TXTX |
| * |
| * If @ref nrfx_twim_xfer_desc_t::type is set to @ref NRFX_TWIM_XFER_TX and the @ref NRFX_TWIM_FLAG_TX_NO_STOP and @ref NRFX_TWIM_FLAG_REPEATED_XFER |
| * flags are set, two tasks must be used to trigger a transfer: TASKS_RESUME followed by TASKS_STARTTX. If no stop condition is generated, |
| * TWIM is in SUSPENDED state. Therefore, it must be resumed before the transfer can be started. |
| * |
| * @note Peripherals using EasyDMA (including TWIM) 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_xfer_desc Pointer to the transfer descriptor. |
| * @param[in] flags Transfer options (0 for default settings). |
| * |
| * @retval NRFX_SUCCESS If the procedure was successful. |
| * @retval NRFX_ERROR_BUSY If the driver is not ready for a new transfer. |
| * @retval NRFX_ERROR_NOT_SUPPORTED If the provided parameters are not supported. |
| * @retval NRFX_ERROR_INTERNAL If an error was detected by hardware. |
| * @retval NRFX_ERROR_INVALID_ADDR If the provided buffers are not placed in the Data RAM region. |
| * @retval NRFX_ERROR_DRV_TWI_ERR_ANACK If NACK received after sending the address. |
| * @retval NRFX_ERROR_DRV_TWI_ERR_DNACK If NACK received after sending a data byte. |
| */ |
| nrfx_err_t nrfx_twim_xfer(nrfx_twim_t const * p_instance, |
| nrfx_twim_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 If the TWI driver is currently busy performing a transfer. |
| * @retval false If the TWI driver is ready for a new transfer. |
| */ |
| bool nrfx_twim_is_busy(nrfx_twim_t const * p_instance); |
| |
| |
| /** |
| * @brief Function for returning the address of a TWIM start task. |
| * |
| * This function should be used if @ref nrfx_twim_xfer was called with the flag @ref NRFX_TWIM_FLAG_HOLD_XFER. |
| * In that case, the transfer is not started by the driver, but it must be started externally by PPI. |
| * |
| * @param[in] p_instance Pointer to the driver instance structure. |
| * @param[in] xfer_type Transfer type used in the last call of the @ref nrfx_twim_xfer function. |
| * |
| * @return Start task address (TX or RX) depending on the value of xfer_type. |
| */ |
| uint32_t nrfx_twim_start_task_get(nrfx_twim_t const * p_instance, nrfx_twim_xfer_type_t xfer_type); |
| |
| /** |
| * @brief Function for returning the address of a STOPPED TWIM event. |
| * |
| * A STOPPED event can be used to detect the end of a transfer if the @ref NRFX_TWIM_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_twim_stopped_event_get(nrfx_twim_t const * p_instance); |
| |
| |
| void nrfx_twim_0_irq_handler(void); |
| void nrfx_twim_1_irq_handler(void); |
| |
| |
| /** @} */ |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif // NRFX_TWIM_H__ |