owner-nrf52sdk/nRF5_SDK_15.2.0/modules/nrfx/drivers/include/nrfx_uarte.h

/**
 * 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
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#ifndef NRFX_UARTE_H__
#define NRFX_UARTE_H__

#include <nrfx.h>
#include <hal/nrf_uarte.h>

#ifdef __cplusplus
extern "C" {
#endif

/**
 * @defgroup nrfx_uarte UARTE driver
 * @{
 * @ingroup nrf_uarte
 * @brief   UARTE peripheral driver.
 */

/**
 * @brief Structure for the UARTE driver instance.
 */
typedef struct
{
    NRF_UARTE_Type * p_reg;        ///< Pointer to a structure with UARTE registers.
    uint8_t          drv_inst_idx; ///< Driver instance index.
} nrfx_uarte_t;

enum {
#if NRFX_CHECK(NRFX_UARTE0_ENABLED)
    NRFX_UARTE0_INST_IDX,
#endif
#if NRFX_CHECK(NRFX_UARTE1_ENABLED)
    NRFX_UARTE1_INST_IDX,
#endif
    NRFX_UARTE_ENABLED_COUNT
};

/**
 * @brief Macro for creating a UARTE driver instance.
 */
#define NRFX_UARTE_INSTANCE(id)                               \
{                                                             \
    .p_reg        = NRFX_CONCAT_2(NRF_UARTE, id),             \
    .drv_inst_idx = NRFX_CONCAT_3(NRFX_UARTE, id, _INST_IDX), \
}

/**
 * @brief Types of UARTE driver events.
 */
typedef enum
{
    NRFX_UARTE_EVT_TX_DONE, ///< Requested TX transfer completed.
    NRFX_UARTE_EVT_RX_DONE, ///< Requested RX transfer completed.
    NRFX_UARTE_EVT_ERROR,   ///< Error reported by UART peripheral.
} nrfx_uarte_evt_type_t;

/**
 * @brief Structure for UARTE configuration.
 */
typedef struct
{
    uint32_t             pseltxd;            ///< TXD pin number.
    uint32_t             pselrxd;            ///< RXD pin number.
    uint32_t             pselcts;            ///< CTS pin number.
    uint32_t             pselrts;            ///< RTS pin number.
    void *               p_context;          ///< Context passed to interrupt handler.
    nrf_uarte_hwfc_t     hwfc;               ///< Flow control configuration.
    nrf_uarte_parity_t   parity;             ///< Parity configuration.
    nrf_uarte_baudrate_t baudrate;           ///< Baudrate.
    uint8_t              interrupt_priority; ///< Interrupt priority.
} nrfx_uarte_config_t;

/**
 * @brief UARTE default configuration.
 */
#define NRFX_UARTE_DEFAULT_CONFIG                                                   \
{                                                                                   \
    .pseltxd            = NRF_UARTE_PSEL_DISCONNECTED,                              \
    .pselrxd            = NRF_UARTE_PSEL_DISCONNECTED,                              \
    .pselcts            = NRF_UARTE_PSEL_DISCONNECTED,                              \
    .pselrts            = NRF_UARTE_PSEL_DISCONNECTED,                              \
    .p_context          = NULL,                                                     \
    .hwfc               = (nrf_uarte_hwfc_t)NRFX_UARTE_DEFAULT_CONFIG_HWFC,         \
    .parity             = (nrf_uarte_parity_t)NRFX_UARTE_DEFAULT_CONFIG_PARITY,     \
    .baudrate           = (nrf_uarte_baudrate_t)NRFX_UARTE_DEFAULT_CONFIG_BAUDRATE, \
    .interrupt_priority = NRFX_UARTE_DEFAULT_CONFIG_IRQ_PRIORITY,                   \
}

/**
 * @brief Structure for UARTE transfer completion event.
 */
typedef struct
{
    uint8_t * p_data; ///< Pointer to memory used for transfer.
    uint8_t   bytes;  ///< Number of bytes transfered.
} nrfx_uarte_xfer_evt_t;

/**
 * @brief Structure for UARTE error event.
 */
typedef struct
{
    nrfx_uarte_xfer_evt_t rxtx;       ///< Transfer details includes number of bytes transferred.
    uint32_t              error_mask; ///< Mask of error flags that generated the event.
} nrfx_uarte_error_evt_t;

/**
 * @brief Structure for UARTE event.
 */
typedef struct
{
    nrfx_uarte_evt_type_t type; ///< Event type.
    union
    {
        nrfx_uarte_xfer_evt_t  rxtx;  ///< Data provided for transfer completion events.
        nrfx_uarte_error_evt_t error; ///< Data provided for error event.
    } data;
} nrfx_uarte_event_t;

/**
 * @brief UARTE interrupt event handler.
 *
 * @param[in] p_event    Pointer to event structure. Event is allocated on the stack so it is available
 *                       only within the context of the event handler.
 * @param[in] p_context  Context passed to interrupt handler, set on initialization.
 */
typedef void (*nrfx_uarte_event_handler_t)(nrfx_uarte_event_t const * p_event,
                                           void *                     p_context);

/**
 * @brief Function for initializing the UARTE driver.
 *
 * This function configures and enables UARTE. After this function GPIO pins are controlled by UARTE.
 *
 * @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 not provided driver works in
 *                          blocking mode.
 *
 * @retval    NRFX_SUCCESS             If initialization was successful.
 * @retval    NRFX_ERROR_INVALID_STATE If driver is already initialized.
 * @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_uarte_init(nrfx_uarte_t const *        p_instance,
                           nrfx_uarte_config_t const * p_config,
                           nrfx_uarte_event_handler_t  event_handler);

/**
 * @brief Function for uninitializing  the UARTE driver.
 * @param[in] p_instance Pointer to the driver instance structure.
 */
void nrfx_uarte_uninit(nrfx_uarte_t const * p_instance);

/**
 * @brief Function for getting the address of a specific UARTE task.
 *
 * @param[in] p_instance Pointer to the driver instance structure.
 * @param[in] task       Task.
 *
 * @return    Task address.
 */
__STATIC_INLINE uint32_t nrfx_uarte_task_address_get(nrfx_uarte_t const * p_instance,
                                                     nrf_uarte_task_t     task);

/**
 * @brief Function for getting the address of a specific UARTE event.
 *
 * @param[in] p_instance Pointer to the driver instance structure.
 * @param[in] event      Event.
 *
 * @return    Event address.
 */
__STATIC_INLINE uint32_t nrfx_uarte_event_address_get(nrfx_uarte_t const * p_instance,
                                                      nrf_uarte_event_t    event);

/**
 * @brief Function for sending data over UARTE.
 *
 * If an event handler was provided in nrfx_uarte_init() call, this function
 * returns immediately and the handler is called when the transfer is done.
 * Otherwise, the transfer is performed in blocking mode, i.e. this function
 * returns when the transfer is finished. Blocking mode is not using interrupt
 * so there is no context switching inside the function.
 *
 * @note Peripherals using EasyDMA (including UARTE) 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_data     Pointer to data.
 * @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.
 *
 * @retval    NRFX_SUCCESS            If initialization was successful.
 * @retval    NRFX_ERROR_BUSY         If driver is already transferring.
 * @retval    NRFX_ERROR_FORBIDDEN    If the transfer was aborted from a different context
 *                                    (blocking mode only).
 * @retval    NRFX_ERROR_INVALID_ADDR If p_data does not point to RAM buffer.
 */
nrfx_err_t nrfx_uarte_tx(nrfx_uarte_t const * p_instance,
                         uint8_t const *      p_data,
                         size_t               length);

/**
 * @brief Function for checking if UARTE is currently transmitting.
 *
 * @param[in] p_instance Pointer to the driver instance structure.
 *
 * @retval true  If UARTE is transmitting.
 * @retval false If UARTE is not transmitting.
 */
bool nrfx_uarte_tx_in_progress(nrfx_uarte_t const * p_instance);

/**
 * @brief Function for aborting any ongoing transmission.
 * @note @ref NRFX_UARTE_EVT_TX_DONE event will be generated in non-blocking mode.
 *       It will contain number of bytes sent until abort was called. The event
 *       handler will be called from UARTE interrupt context.
 *
 * @param[in] p_instance Pointer to the driver instance structure.
 */
void nrfx_uarte_tx_abort(nrfx_uarte_t const * p_instance);

/**
 * @brief Function for receiving data over UARTE.
 *
 * If an event handler was provided in the nrfx_uarte_init() call, this function
 * returns immediately and the handler is called when the transfer is done.
 * Otherwise, the transfer is performed in blocking mode, i.e. this function
 * returns when the transfer is finished. Blocking mode is not using interrupt so
 * there is no context switching inside the function.
 * The receive buffer pointer is double buffered in non-blocking mode. The secondary
 * buffer can be set immediately after starting the transfer and will be filled
 * when the primary buffer is full. The double buffering feature allows
 * receiving data continuously.
 *
 * @note Peripherals using EasyDMA (including UARTE) 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_data     Pointer to data.
 * @param[in] length     Number of bytes to receive. 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 initialization was successful.
 * @retval    NRFX_ERROR_BUSY         If the driver is already receiving
 *                                    (and the secondary buffer has already been set
 *                                    in non-blocking mode).
 * @retval    NRFX_ERROR_FORBIDDEN    If the transfer was aborted from a different context
 *                                    (blocking mode only).
 * @retval    NRFX_ERROR_INTERNAL     If UARTE peripheral reported an error.
 * @retval    NRFX_ERROR_INVALID_ADDR If p_data does not point to RAM buffer.
 */
nrfx_err_t nrfx_uarte_rx(nrfx_uarte_t const * p_instance,
                         uint8_t *            p_data,
                         size_t               length);



/**
 * @brief Function for testing the receiver state in blocking mode.
 *
 * @param[in] p_instance Pointer to the driver instance structure.
 *
 * @retval true  If the receiver has at least one byte of data to get.
 * @retval false If the receiver is empty.
 */
bool nrfx_uarte_rx_ready(nrfx_uarte_t const * p_instance);

/**
 * @brief Function for aborting any ongoing reception.
 * @note @ref NRFX_UARTE_EVT_RX_DONE event will be generated in non-blocking mode.
 *       It will contain number of bytes received until abort was called. The event
 *       handler will be called from UARTE interrupt context.
 *
 * @param[in] p_instance Pointer to the driver instance structure.
 */
void nrfx_uarte_rx_abort(nrfx_uarte_t const * p_instance);

/**
 * @brief Function for reading error source mask. Mask contains values from @ref nrf_uarte_error_mask_t.
 * @note Function should be used in blocking mode only. In case of non-blocking mode, an error event is
 *       generated. Function clears error sources after reading.
 *
 * @param[in] p_instance Pointer to the driver instance structure.
 *
 * @retval    Mask of reported errors.
 */
uint32_t nrfx_uarte_errorsrc_get(nrfx_uarte_t const * p_instance);


#ifndef SUPPRESS_INLINE_IMPLEMENTATION
__STATIC_INLINE uint32_t nrfx_uarte_task_address_get(nrfx_uarte_t const * p_instance,
                                                     nrf_uarte_task_t     task)
{
    return nrf_uarte_task_address_get(p_instance->p_reg, task);
}

__STATIC_INLINE uint32_t nrfx_uarte_event_address_get(nrfx_uarte_t const * p_instance,
                                                      nrf_uarte_event_t    event)
{
    return nrf_uarte_event_address_get(p_instance->p_reg, event);
}
#endif // SUPPRESS_INLINE_IMPLEMENTATION


void nrfx_uarte_0_irq_handler(void);
void nrfx_uarte_1_irq_handler(void);

/** @} */

#ifdef __cplusplus
}
#endif

#endif // NRFX_UARTE_H__