nrf5x_sdk/components/libraries/libuarte/nrf_libuarte_drv.c

/**
 * Copyright (c) 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, 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.
 *
 */
#include "sdk_config.h"
#include "nrf_libuarte_drv.h"
#include "nrf_uarte.h"
#include "nrf_gpio.h"
#include <nrfx_gpiote.h>
#include <../src/prs/nrfx_prs.h>

#define NRF_LOG_MODULE_NAME libUARTE
#if NRF_LIBUARTE_CONFIG_LOG_ENABLED
#define NRF_LOG_LEVEL       NRF_LIBUARTE_CONFIG_LOG_LEVEL
#define NRF_LOG_INFO_COLOR  NRF_LIBUARTE_CONFIG_INFO_COLOR
#define NRF_LOG_DEBUG_COLOR NRF_LIBUARTE_CONFIG_DEBUG_COLOR
#else // NRF_LIBUARTE_CONFIG_LOG_ENABLED
#define NRF_LOG_LEVEL       0
#endif // NRF_LIBUARTE_CONFIG_LOG_ENABLED
#include "nrf_log.h"
NRF_LOG_MODULE_REGISTER();

#define MAX_DMA_XFER_LEN    ((1UL << UARTE0_EASYDMA_MAXCNT_SIZE) - 1)

#define INTERRUPTS_MASK  \
    (NRF_UARTE_INT_ENDRX_MASK | NRF_UARTE_INT_RXSTARTED_MASK | NRF_UARTE_INT_ERROR_MASK | \
     NRF_UARTE_INT_ENDTX_MASK | NRF_UARTE_INT_TXSTOPPED_MASK)

static const nrf_libuarte_drv_t * m_libuarte_instance[2];

/* if it is defined it means that PRS for uart is not used. */
#ifdef nrfx_uarte_0_irq_handler
#define libuarte_0_irq_handler UARTE0_UART0_IRQHandler
#endif

#if NRFX_CHECK(NRF_LIBUARTE_DRV_UARTE0)
void libuarte_0_irq_handler(void);
#endif

#if NRFX_CHECK(NRF_LIBUARTE_DRV_UARTE1)
void libuarte_1_irq_handler(void);
#endif

#if defined(NRF_LIBUARTE_DRV_HWFC_ENABLED)
#define LIBUARTE_DRV_WITH_HWFC NRF_LIBUARTE_DRV_HWFC_ENABLED
#else
#define LIBUARTE_DRV_WITH_HWFC 1
#endif

#define RTS_PIN_DISABLED 0xff

/** @brief Macro executes given function on every allocated channel in the list between provided
 * indexes.
 */
#define PPI_CHANNEL_FOR_M_N(p_libuarte, m, n, func) \
        for (int i = m; i < n; i++) \
        { \
            if (p_libuarte->ctrl_blk->ppi_channels[i] < PPI_CH_NUM) \
            { func(&p_libuarte->ctrl_blk->ppi_channels[i]); } \
        }

/** @brief Macro executes provided function on every allocated PPI channel. */
#define PPI_CHANNEL_FOR_ALL(p_libuarte, func) \
        PPI_CHANNEL_FOR_M_N(p_libuarte, 0, NRF_LIBUARTE_DRV_PPI_CH_MAX, func)

/** @brief Macro executes provided function on every allocated group in the list. */
#define PPI_GROUP_FOR_ALL(p_libuarte, func) \
        for (int i = 0; i < NRF_LIBUARTE_DRV_PPI_GROUP_MAX; i++) \
        { \
            if (p_libuarte->ctrl_blk->ppi_groups[i] < PPI_GROUP_NUM) \
                { func(&p_libuarte->ctrl_blk->ppi_groups[i]); } \
        }

/** @brief Allocate and configure PPI channel. Fork is optional and it's not set if NULL.
 *         Channel parameter is field by the function.
 */
static ret_code_t ppi_channel_configure(nrf_ppi_channel_t * p_ch, uint32_t evt,
                                        uint32_t task, uint32_t fork)
{
    nrfx_err_t err;

    err = nrfx_ppi_channel_alloc(p_ch);
    if (err != NRFX_SUCCESS)
    {
        return NRF_ERROR_NO_MEM;
    }

    err = nrfx_ppi_channel_assign(*p_ch, evt, task);
    if (err != NRFX_SUCCESS)
    {
        return NRF_ERROR_INTERNAL;
    }

    if (fork)
    {
        err = nrfx_ppi_channel_fork_assign(*p_ch, fork);
        if (err != NRFX_SUCCESS)
        {
            return NRF_ERROR_INTERNAL;
        }
    }

    return NRF_SUCCESS;
}

/** @brief Allocate and configure group with one channel. Fetch addresses of enable/disable tasks.*/
static ret_code_t ppi_group_configure(nrf_ppi_channel_group_t * p_ppi_group, nrf_ppi_channel_t ch,
                                      uint32_t * p_en_task, uint32_t * p_dis_task, bool en)
{
    nrfx_err_t err;

    err = nrfx_ppi_group_alloc(p_ppi_group);
    if (err != NRFX_SUCCESS)
    {
        return NRF_ERROR_NO_MEM;
    }

    err = nrfx_ppi_channel_include_in_group(ch, *p_ppi_group);
    if (err != NRFX_SUCCESS)
    {
        return NRF_ERROR_INTERNAL;
    }

    if (en)
    {
        err = nrfx_ppi_group_enable(*p_ppi_group);
        if (err != NRFX_SUCCESS)
        {
            return NRF_ERROR_INTERNAL;
        }
    }

    *p_en_task = nrfx_ppi_task_addr_group_enable_get(*p_ppi_group);
    *p_dis_task = nrfx_ppi_task_addr_group_disable_get(*p_ppi_group);

    return NRF_SUCCESS;
}

/** @brief Disable and free PPI channel. */
static void ppi_ch_free(nrf_ppi_channel_t * p_ch)
{
    nrfx_err_t err;
    err = nrfx_ppi_channel_disable(*p_ch);
    ASSERT(err == NRFX_SUCCESS);
    err = nrfx_ppi_channel_free(*p_ch);
    ASSERT(err == NRFX_SUCCESS);
    *p_ch = (nrf_ppi_channel_t)PPI_CH_NUM;
}

/** @brief Disable and free PPI group. */
static void ppi_group_free(nrf_ppi_channel_group_t * p_group)
{
    nrfx_err_t err;
    err = nrfx_ppi_group_free(*p_group);
    ASSERT(err == NRFX_SUCCESS);
    *p_group = (nrf_ppi_channel_group_t)PPI_GROUP_NUM;

}

/** @brief Free all channels. */
static void ppi_free(const nrf_libuarte_drv_t * const p_libuarte)
{
    PPI_CHANNEL_FOR_ALL(p_libuarte, ppi_ch_free);
    PPI_GROUP_FOR_ALL(p_libuarte, ppi_group_free);
}

/** @brief Enable PPI channel. */
static void ppi_ch_enable(nrf_ppi_channel_t * p_ch)
{
    nrfx_err_t err;
    err = nrfx_ppi_channel_enable(*p_ch);
    ASSERT(err == NRFX_SUCCESS);
}

/** @brief Disable PPI channel. */
static void ppi_ch_disable(nrf_ppi_channel_t * p_ch)
{
    nrfx_err_t err;
    err = nrfx_ppi_channel_disable(*p_ch);
    ASSERT(err == NRFX_SUCCESS);
}

/** @brief Enable PPI channels for RX. */
static void rx_ppi_enable(const nrf_libuarte_drv_t * const p_libuarte)
{
    PPI_CHANNEL_FOR_M_N(p_libuarte, 0, NRF_LIBUARTE_DRV_PPI_CH_RX_GROUP_MAX, ppi_ch_enable);
}

/** @brief Disable PPI channels for RX. */
static void rx_ppi_disable(const nrf_libuarte_drv_t * const p_libuarte)
{
    PPI_CHANNEL_FOR_M_N(p_libuarte, 0, NRF_LIBUARTE_DRV_PPI_CH_RX_GROUP_MAX, ppi_ch_disable);
}

/** @brief Enable PPI channels for TX. */
static void tx_ppi_enable(const nrf_libuarte_drv_t * const p_libuarte)
{
    PPI_CHANNEL_FOR_M_N(p_libuarte, NRF_LIBUARTE_DRV_PPI_CH_RX_GROUP_MAX,
                        NRF_LIBUARTE_DRV_PPI_CH_MAX, ppi_ch_enable);
}

/** @brief Disable PPI channels for TX. */
static void tx_ppi_disable(const nrf_libuarte_drv_t * const p_libuarte)
{
    PPI_CHANNEL_FOR_M_N(p_libuarte, NRF_LIBUARTE_DRV_PPI_CH_RX_GROUP_MAX,
                        NRF_LIBUARTE_DRV_PPI_CH_MAX, ppi_ch_disable);
}

static ret_code_t ppi_configure(const nrf_libuarte_drv_t * const p_libuarte,
                                nrf_libuarte_drv_config_t * p_config)
{
    ret_code_t ret;
    uint32_t gr0_en_task = 0;
    uint32_t gr0_dis_task = 0;
    uint32_t gr1_en_task = 0;
    uint32_t gr1_dis_task = 0;

    for (int i = 0; i < NRF_LIBUARTE_DRV_PPI_CH_MAX; i++)
    {
        /* set to invalid value */
        p_libuarte->ctrl_blk->ppi_channels[i] = (nrf_ppi_channel_t)PPI_CH_NUM;
    }

    for (int i = 0; i < NRF_LIBUARTE_DRV_PPI_GROUP_MAX; i++)
    {
        /* set to invalid value */
        p_libuarte->ctrl_blk->ppi_groups[i] = (nrf_ppi_channel_group_t)PPI_GROUP_NUM;
    }

    if (MAX_DMA_XFER_LEN < UINT16_MAX)
    {
        ret = ppi_channel_configure(
                &p_libuarte->ctrl_blk->ppi_channels[NRF_LIBUARTE_DRV_PPI_CH_ENDTX_STARTTX],
                nrf_uarte_event_address_get(p_libuarte->uarte, NRF_UARTE_EVENT_ENDTX),
                nrf_uarte_task_address_get(p_libuarte->uarte, NRF_UARTE_TASK_STARTTX),
                0);
        if (ret != NRF_SUCCESS)
        {
            goto complete_config;
        }
    }

    ret = ppi_channel_configure(
            &p_libuarte->ctrl_blk->ppi_channels[NRF_LIBUARTE_DRV_PPI_CH_RXRDY_TIMER_COUNT],
            nrf_uarte_event_address_get(p_libuarte->uarte, NRF_UARTE_EVENT_RXDRDY),
            nrfx_timer_task_address_get(&p_libuarte->timer, NRF_TIMER_TASK_COUNT),
            0);
    if (ret != NRF_SUCCESS)
    {
        goto complete_config;
    }

    ret = ppi_channel_configure(
            &p_libuarte->ctrl_blk->ppi_channels[NRF_LIBUARTE_DRV_PPI_CH_ENDRX_STARTRX],
            nrf_uarte_event_address_get(p_libuarte->uarte, NRF_UARTE_EVENT_ENDRX),
            nrf_uarte_task_address_get(p_libuarte->uarte, NRF_UARTE_TASK_STARTRX),
            nrfx_timer_capture_task_address_get(&p_libuarte->timer, 0));
    if (ret != NRF_SUCCESS)
    {
        goto complete_config;
    }

    if (p_config->endrx_evt && p_config->rxdone_tsk)
    {
        ret = ppi_channel_configure(
                &p_libuarte->ctrl_blk->ppi_channels[NRF_LIBUARTE_DRV_PPI_CH_ENDRX_EXT_TSK],
                nrf_uarte_event_address_get(p_libuarte->uarte, NRF_UARTE_EVENT_ENDRX),
                nrfx_timer_capture_task_address_get(&p_libuarte->timer, 0),
                p_config->rxdone_tsk);
        if (ret != NRF_SUCCESS)
        {
            goto complete_config;
        }

        ret = ppi_group_configure(&p_libuarte->ctrl_blk->ppi_groups[NRF_LIBUARTE_DRV_PPI_GROUP_ENDRX_STARTRX],
                p_libuarte->ctrl_blk->ppi_channels[NRF_LIBUARTE_DRV_PPI_CH_ENDRX_STARTRX],
                &gr0_en_task, &gr0_dis_task, true);
        if (ret != NRF_SUCCESS)
        {
            goto complete_config;
        }

        ret = ppi_group_configure(&p_libuarte->ctrl_blk->ppi_groups[NRF_LIBUARTE_DRV_PPI_GROUP_ENDRX_EXT_RXDONE_TSK],
                p_libuarte->ctrl_blk->ppi_channels[NRF_LIBUARTE_DRV_PPI_CH_ENDRX_EXT_TSK],
                &gr1_en_task, &gr1_dis_task, false);
        if (ret != NRF_SUCCESS)
        {
            goto complete_config;
        }

        ret = ppi_channel_configure(
                &p_libuarte->ctrl_blk->ppi_channels[NRF_LIBUARTE_DRV_PPI_CH_EXT_STOP_STOPRX],
                p_config->endrx_evt,
                nrf_uarte_task_address_get(p_libuarte->uarte, NRF_UARTE_TASK_STOPRX),
                nrfx_timer_capture_task_address_get(&p_libuarte->timer, 1));
        if (ret != NRF_SUCCESS)
        {
            goto complete_config;
        }

        ret = ppi_channel_configure(
                &p_libuarte->ctrl_blk->ppi_channels[NRF_LIBUARTE_DRV_PPI_CH_EXT_STOP_GROUPS_EN],
                p_config->endrx_evt,
                gr0_dis_task,
                gr1_en_task);
        if (ret != NRF_SUCCESS)
        {
            goto complete_config;
        }
    }

    if (p_config->rxstarted_tsk || gr1_dis_task)
    {
        ret = ppi_channel_configure(
                &p_libuarte->ctrl_blk->ppi_channels[NRF_LIBUARTE_DRV_PPI_CH_RXSTARTED_EXT_TSK],
                nrf_uarte_event_address_get(p_libuarte->uarte, NRF_UARTE_EVENT_RXSTARTED),
                gr1_dis_task ? gr1_dis_task : p_config->rxstarted_tsk,
                gr1_dis_task ? p_config->rxstarted_tsk : 0);
        if (ret != NRF_SUCCESS)
        {
            goto complete_config;
        }
    }

    if (p_config->startrx_evt)
    {
        ret = ppi_channel_configure(
                &p_libuarte->ctrl_blk->ppi_channels[NRF_LIBUARTE_DRV_PPI_CH_EXT_TRIGGER_STARTRX_EN_ENDRX_STARTX],
                p_config->startrx_evt,
                nrf_uarte_task_address_get(p_libuarte->uarte, NRF_UARTE_TASK_STARTRX),
                gr0_en_task);
        if (ret != NRF_SUCCESS)
        {
            goto complete_config;
        }
    }

    if (p_config->endrx_evt)
    {

    }

    if (LIBUARTE_DRV_WITH_HWFC && (p_config->rts_pin != NRF_UARTE_PSEL_DISCONNECTED))
    {
        ret = ppi_channel_configure(&p_libuarte->ctrl_blk->ppi_channels[NRF_LIBUARTE_DRV_PPI_CH_RTS_PIN],
                nrfx_timer_compare_event_address_get(&p_libuarte->timer, 2),
                nrfx_gpiote_set_task_addr_get(p_config->rts_pin),
                0);
        if (ret != NRF_SUCCESS)
        {
            goto complete_config;
        }
    }

complete_config:
    if (ret == NRF_SUCCESS)
    {
        return ret;
    }

    ppi_free(p_libuarte);

    return ret;
}

void tmr_evt_handler(nrf_timer_event_t event_type, void * p_context)
{
    UNUSED_PARAMETER(event_type);
    UNUSED_PARAMETER(p_context);
}

ret_code_t nrf_libuarte_drv_init(const nrf_libuarte_drv_t * const p_libuarte,
                             nrf_libuarte_drv_config_t * p_config,
                             nrf_libuarte_drv_evt_handler_t evt_handler,
                             void * context)
{
    ret_code_t ret;
    IRQn_Type irqn = nrfx_get_irq_number(p_libuarte->uarte);

    p_libuarte->ctrl_blk->evt_handler = evt_handler;
    p_libuarte->ctrl_blk->p_cur_rx = NULL;
    p_libuarte->ctrl_blk->p_next_rx = NULL;
    p_libuarte->ctrl_blk->p_next_next_rx = NULL;
    p_libuarte->ctrl_blk->p_tx = NULL;
    p_libuarte->ctrl_blk->context = context;

    m_libuarte_instance[p_libuarte->uarte == NRF_UARTE0 ? 0 : 1] = p_libuarte;

    //UART init
    nrf_gpio_pin_set(p_config->tx_pin);
    nrf_gpio_cfg_output(p_config->tx_pin);
    nrf_gpio_cfg_input(p_config->rx_pin, p_config->pullup_rx ?
                        NRF_GPIO_PIN_PULLUP : NRF_GPIO_PIN_NOPULL);
    nrf_uarte_baudrate_set(p_libuarte->uarte, p_config->baudrate);
    nrf_uarte_configure(p_libuarte->uarte, p_config->parity, p_config->hwfc);
    nrf_uarte_txrx_pins_set(p_libuarte->uarte, p_config->tx_pin, p_config->rx_pin);

    if (LIBUARTE_DRV_WITH_HWFC && (p_config->hwfc == NRF_UARTE_HWFC_ENABLED))
    {
        if (p_config->cts_pin != NRF_UARTE_PSEL_DISCONNECTED)
        {
            nrf_gpio_cfg_input(p_config->cts_pin, NRF_GPIO_PIN_PULLUP);
        }
        if (p_config->rts_pin != NRF_UARTE_PSEL_DISCONNECTED)
        {
            nrfx_gpiote_out_config_t out_config = NRFX_GPIOTE_CONFIG_OUT_TASK_TOGGLE(true);

            nrfx_err_t err = nrfx_gpiote_init();
            if ((err != NRFX_SUCCESS) && (err != NRFX_ERROR_INVALID_STATE))
            {
                return err;
            }

            err = nrfx_gpiote_out_init(p_config->rts_pin, &out_config);
            if (err != NRFX_SUCCESS)
            {
                return NRF_ERROR_INTERNAL;
            }
            nrfx_gpiote_out_task_enable(p_config->rts_pin);
            nrf_gpio_cfg_output(p_config->rts_pin);
            p_libuarte->ctrl_blk->rts_pin = p_config->rts_pin;
        }
        else
        {
            p_libuarte->ctrl_blk->rts_pin = RTS_PIN_DISABLED;
        }

        nrf_uarte_hwfc_pins_set(p_libuarte->uarte, NRF_UARTE_PSEL_DISCONNECTED, p_config->cts_pin);
    }
    else if ((p_config->hwfc == NRF_UARTE_HWFC_ENABLED) && !LIBUARTE_DRV_WITH_HWFC)
    {
        return NRFX_ERROR_INVALID_PARAM;
    }

#if NRFX_CHECK(NRFX_PRS_ENABLED) && NRFX_CHECK(NRF_LIBUARTE_DRV_UARTE0)
    if (irqn == UARTE0_UART0_IRQn)
    {
        if (nrfx_prs_acquire(p_libuarte->uarte, libuarte_0_irq_handler) != NRFX_SUCCESS)
        {
            return NRF_ERROR_BUSY;
        }
    }
#endif // NRFX_CHECK(NRFX_PRS_ENABLED) && NRFX_CHECK(NRF_LIBUARTE_DRV_UARTE0)

    nrf_uarte_int_enable(p_libuarte->uarte, INTERRUPTS_MASK);

    NVIC_SetPriority(irqn, p_config->irq_priority);
    NVIC_ClearPendingIRQ(irqn);
    NVIC_EnableIRQ(irqn);

    nrf_uarte_enable(p_libuarte->uarte);

    nrfx_timer_config_t tmr_config = NRFX_TIMER_DEFAULT_CONFIG;
    tmr_config.mode = NRF_TIMER_MODE_COUNTER;
    tmr_config.bit_width = NRF_TIMER_BIT_WIDTH_32;
    ret = nrfx_timer_init(&p_libuarte->timer, &tmr_config, tmr_evt_handler);
    if (ret != NRFX_SUCCESS)
    {
        return NRF_ERROR_INTERNAL;
    }

    return ppi_configure(p_libuarte, p_config);
}

void nrf_libuarte_drv_uninit(const nrf_libuarte_drv_t * const p_libuarte)
{
    IRQn_Type irqn = nrfx_get_irq_number(p_libuarte->uarte);

    NVIC_DisableIRQ(irqn);
    nrf_uarte_int_disable(p_libuarte->uarte, 0xFFFFFFFF);
    nrf_uarte_event_clear(p_libuarte->uarte, NRF_UARTE_EVENT_TXSTOPPED);
    nrf_uarte_task_trigger(p_libuarte->uarte, NRF_UARTE_TASK_STOPTX);
    nrf_uarte_task_trigger(p_libuarte->uarte, NRF_UARTE_TASK_STOPRX);

    nrf_uarte_int_disable(p_libuarte->uarte, 0xFFFFFFFF);
    nrf_uarte_disable(p_libuarte->uarte);

    nrf_uarte_event_clear(p_libuarte->uarte, NRF_UARTE_EVENT_TXSTARTED);
    nrf_uarte_event_clear(p_libuarte->uarte, NRF_UARTE_EVENT_TXSTOPPED);
    nrf_uarte_event_clear(p_libuarte->uarte, NRF_UARTE_EVENT_ENDTX);
    nrf_uarte_event_clear(p_libuarte->uarte, NRF_UARTE_EVENT_ENDRX);
    nrf_uarte_event_clear(p_libuarte->uarte, NRF_UARTE_EVENT_RXSTARTED);

#if NRFX_CHECK(NRFX_PRS_ENABLED) && NRFX_CHECK(NRF_LIBUARTE_DRV_UARTE0)
    if (irqn == UARTE0_UART0_IRQn)
    {
        nrfx_prs_release(p_libuarte->uarte);
    }
#endif // NRFX_CHECK(NRFX_PRS_ENABLED) && NRFX_CHECK(NRF_LIBUARTE_DRV_UARTE0)

    nrfx_timer_disable(&p_libuarte->timer);
    nrfx_timer_uninit(&p_libuarte->timer);

    if (LIBUARTE_DRV_WITH_HWFC && (p_libuarte->ctrl_blk->rts_pin != RTS_PIN_DISABLED))
    {
        nrfx_gpiote_out_uninit(p_libuarte->ctrl_blk->rts_pin);
    }
    ppi_free(p_libuarte);
}

ret_code_t nrf_libuarte_drv_tx(const nrf_libuarte_drv_t * const p_libuarte,
                               uint8_t * p_data, size_t len)
{
    if (p_libuarte->ctrl_blk->p_tx)
    {
        return NRF_ERROR_BUSY;
    }
    p_libuarte->ctrl_blk->p_tx = p_data;
    p_libuarte->ctrl_blk->tx_len = len;
    p_libuarte->ctrl_blk->tx_cur_idx = 0;
    uint16_t first_chunk;

    if ((MAX_DMA_XFER_LEN <= UINT16_MAX) && (len <= MAX_DMA_XFER_LEN))
    {
        first_chunk = len;
        p_libuarte->ctrl_blk->tx_chunk8 = 0;
    }
    else
    {
        uint32_t num_of_chunks = CEIL_DIV(len, MAX_DMA_XFER_LEN);
        p_libuarte->ctrl_blk->tx_chunk8 =  len/num_of_chunks;
        first_chunk = p_libuarte->ctrl_blk->tx_chunk8 + len%p_libuarte->ctrl_blk->tx_chunk8;
    }

    NRF_LOG_WARNING("Started TX total length:%d, first chunk:%d", len, first_chunk);
    nrf_uarte_tx_buffer_set(p_libuarte->uarte, p_data, first_chunk);
    nrf_uarte_event_clear(p_libuarte->uarte, NRF_UARTE_EVENT_TXSTARTED);
    nrf_uarte_task_trigger(p_libuarte->uarte, NRF_UARTE_TASK_STARTTX);

    if ((MAX_DMA_XFER_LEN <= UINT16_MAX) && (len > MAX_DMA_XFER_LEN))
    {
        while(nrf_uarte_event_check(p_libuarte->uarte, NRF_UARTE_EVENT_TXSTARTED) == 0)
        {
        }
        nrf_uarte_event_clear(p_libuarte->uarte, NRF_UARTE_EVENT_TXSTARTED);
        tx_ppi_enable(p_libuarte);

        nrf_uarte_tx_buffer_set(p_libuarte->uarte, &p_libuarte->ctrl_blk->p_tx[first_chunk], p_libuarte->ctrl_blk->tx_chunk8);
    }
    return NRF_SUCCESS;
}

ret_code_t nrf_libuarte_drv_rx_start(const nrf_libuarte_drv_t * const p_libuarte,
                                     uint8_t * p_data, size_t len, bool ext_trigger_en)
{

    p_libuarte->ctrl_blk->chunk_size = len;

    ASSERT(len <= MAX_DMA_XFER_LEN);

    if (p_data)
    {
        p_libuarte->ctrl_blk->p_cur_rx = p_data;
        nrf_uarte_rx_buffer_set(p_libuarte->uarte, p_data, len);
    }

    /* Reset byte counting */
    nrfx_timer_enable(&p_libuarte->timer);
    nrfx_timer_clear(&p_libuarte->timer);
    p_libuarte->ctrl_blk->last_rx_byte_cnt = 0;
    p_libuarte->ctrl_blk->last_pin_rx_byte_cnt = 0;

    nrf_uarte_event_clear(p_libuarte->uarte, NRF_UARTE_EVENT_ENDRX);
    nrf_uarte_event_clear(p_libuarte->uarte, NRF_UARTE_EVENT_RXSTARTED);

    rx_ppi_enable(p_libuarte);

    if (LIBUARTE_DRV_WITH_HWFC && (p_libuarte->ctrl_blk->rts_pin != RTS_PIN_DISABLED))
    {
        uint32_t rx_limit = len - NRF_LIBUARTE_DRV_HWFC_BYTE_LIMIT;
        *(uint32_t *)nrfx_gpiote_clr_task_addr_get(p_libuarte->ctrl_blk->rts_pin) = 1;
        nrfx_timer_compare(&p_libuarte->timer, NRF_TIMER_CC_CHANNEL2, rx_limit, false);
    }

    if (!ext_trigger_en)
    {
         nrf_uarte_task_trigger(p_libuarte->uarte, NRF_UARTE_TASK_STARTRX);
    }
    NRF_LOG_DEBUG("Start continues RX. Provided buffer:0x%08X", p_data);
    return NRF_SUCCESS;
}

void nrf_libuarte_drv_rx_buf_rsp(const nrf_libuarte_drv_t * const p_libuarte,
                                 uint8_t * p_data, size_t len)
{
    if (p_libuarte->ctrl_blk->p_next_rx == NULL)
    {
        p_libuarte->ctrl_blk->p_next_rx = p_data;
        NRF_LOG_DEBUG("RX buf response (next). Provided buffer:0x%08X", p_data);
        nrf_uarte_rx_buffer_set(p_libuarte->uarte, p_data, len);
    }
    else
    {
        NRF_LOG_DEBUG("RX buf response (mp_next_rx not NULL:0x%08X), Provided buffer:0x%08X",
                        p_libuarte->ctrl_blk->p_next_rx, p_data);
        p_libuarte->ctrl_blk->p_next_next_rx = p_data;
    }

    if (LIBUARTE_DRV_WITH_HWFC && (p_libuarte->ctrl_blk->rts_pin != RTS_PIN_DISABLED))
    {
        uint32_t rx_limit = nrfx_timer_capture_get(&p_libuarte->timer, NRF_TIMER_CC_CHANNEL0) +
                2*len - NRF_LIBUARTE_DRV_HWFC_BYTE_LIMIT;
        nrfx_timer_compare(&p_libuarte->timer, NRF_TIMER_CC_CHANNEL2, rx_limit, false);
        if (p_libuarte->ctrl_blk->rts_manual == false)
        {
            *(uint32_t *)nrfx_gpiote_clr_task_addr_get(p_libuarte->ctrl_blk->rts_pin) = 1;
        }
    }
}

void nrf_libuarte_drv_rx_stop(const nrf_libuarte_drv_t * const p_libuarte)
{
    rx_ppi_disable(p_libuarte);

    NRF_LOG_DEBUG("RX stopped.");
    if (LIBUARTE_DRV_WITH_HWFC && (p_libuarte->ctrl_blk->rts_pin != RTS_PIN_DISABLED))
    {
        *(uint32_t *)nrfx_gpiote_set_task_addr_get(p_libuarte->ctrl_blk->rts_pin) = 1;
    }
    nrf_uarte_task_trigger(p_libuarte->uarte, NRF_UARTE_TASK_STOPRX);
}

void nrf_libuarte_drv_rts_clear(const nrf_libuarte_drv_t * const p_libuarte)
{
    if (LIBUARTE_DRV_WITH_HWFC && (p_libuarte->ctrl_blk->rts_pin != RTS_PIN_DISABLED))
    {
        *(uint32_t *)nrfx_gpiote_clr_task_addr_get(p_libuarte->ctrl_blk->rts_pin) = 1;
        p_libuarte->ctrl_blk->rts_manual = false;
    }
}

void nrf_libuarte_drv_rts_set(const nrf_libuarte_drv_t * const p_libuarte)
{
    if (LIBUARTE_DRV_WITH_HWFC && (p_libuarte->ctrl_blk->rts_pin != RTS_PIN_DISABLED))
    {
        p_libuarte->ctrl_blk->rts_manual = true;
        *(uint32_t *)nrfx_gpiote_set_task_addr_get(p_libuarte->ctrl_blk->rts_pin) = 1;
    }
}

static void irq_handler(const nrf_libuarte_drv_t * const p_libuarte)
{
    if (nrf_uarte_event_check(p_libuarte->uarte, NRF_UARTE_EVENT_ERROR))
    {
        nrf_uarte_event_clear(p_libuarte->uarte, NRF_UARTE_EVENT_ERROR);
        nrf_libuarte_drv_evt_t evt = {
                .type = NRF_LIBUARTE_DRV_EVT_ERROR,
                .data = { .errorsrc = nrf_uarte_errorsrc_get_and_clear(p_libuarte->uarte) }
        };
        p_libuarte->ctrl_blk->evt_handler(p_libuarte->ctrl_blk->context, &evt);
    }

    if (nrf_uarte_event_check(p_libuarte->uarte, NRF_UARTE_EVENT_RXSTARTED))
    {
        nrf_uarte_event_clear(p_libuarte->uarte, NRF_UARTE_EVENT_RXSTARTED);

        nrf_libuarte_drv_evt_t evt = {
                .type = NRF_LIBUARTE_DRV_EVT_RX_BUF_REQ,
        };
        p_libuarte->ctrl_blk->evt_handler(p_libuarte->ctrl_blk->context, &evt);
    }

    if (nrf_uarte_event_check(p_libuarte->uarte, NRF_UARTE_EVENT_ENDRX))
    {
        nrf_uarte_event_clear(p_libuarte->uarte, NRF_UARTE_EVENT_ENDRX);

        uint32_t endrx_byte_cnt = nrfx_timer_capture_get(&p_libuarte->timer, NRF_TIMER_CC_CHANNEL0);
        uint32_t stop_byte_cnt  = nrfx_timer_capture_get(&p_libuarte->timer, NRF_TIMER_CC_CHANNEL1);

        uint32_t dma_amount = endrx_byte_cnt - p_libuarte->ctrl_blk->last_rx_byte_cnt;
        uint32_t pin_amount = stop_byte_cnt - p_libuarte->ctrl_blk->last_pin_rx_byte_cnt;
        NRF_LOG_DEBUG("(evt) RX dma_cnt:%d, endrx_cnt:%d, stop_cnt:%d",
                     dma_amount,
                     endrx_byte_cnt,
                     stop_byte_cnt);
        p_libuarte->ctrl_blk->last_rx_byte_cnt = endrx_byte_cnt;
        p_libuarte->ctrl_blk->last_pin_rx_byte_cnt = stop_byte_cnt;

        if (dma_amount || pin_amount)
        {
            uint32_t chunk0 = (dma_amount > p_libuarte->ctrl_blk->chunk_size) ?
                                p_libuarte->ctrl_blk->chunk_size : dma_amount;
            uint32_t chunk1 = dma_amount - chunk0;

            NRF_LOG_DEBUG("RX END chunk0:%d, chunk1:%d, data[0]=%d %d",
                         chunk0,
                         chunk1,
                         p_libuarte->ctrl_blk->p_cur_rx[0],
                         p_libuarte->ctrl_blk->p_cur_rx[1]);
            nrf_libuarte_drv_evt_t evt = {
                    .type = NRF_LIBUARTE_DRV_EVT_RX_DATA,
                    .data = {
                            .rxtx = {
                                .p_data = p_libuarte->ctrl_blk->p_cur_rx,
                                .length = chunk0
                            }
                    }
            };
            p_libuarte->ctrl_blk->p_cur_rx = p_libuarte->ctrl_blk->p_next_rx;
            p_libuarte->ctrl_blk->p_next_rx = NULL;
            if (p_libuarte->ctrl_blk->p_next_next_rx)
            {
                p_libuarte->ctrl_blk->p_next_rx = p_libuarte->ctrl_blk->p_next_next_rx;
                p_libuarte->ctrl_blk->p_next_next_rx = NULL;
                nrf_uarte_rx_buffer_set(p_libuarte->uarte,
                                        p_libuarte->ctrl_blk->p_next_rx,
                                        p_libuarte->ctrl_blk->chunk_size);
            }
            p_libuarte->ctrl_blk->evt_handler(p_libuarte->ctrl_blk->context, &evt);

            if ( chunk1 ||
                ((dma_amount == p_libuarte->ctrl_blk->chunk_size) && (endrx_byte_cnt == stop_byte_cnt)))
            {
                NRF_LOG_WARNING("RX END Chunk1:%d", chunk1);

                nrf_libuarte_drv_evt_t err_evt = {
                    .type = NRF_LIBUARTE_DRV_EVT_OVERRUN_ERROR,
                    .data = {
                            .overrun_err = {
                                    .overrun_length = chunk1
                            }
                    }
                };
                p_libuarte->ctrl_blk->evt_handler(p_libuarte->ctrl_blk->context, &err_evt);

                p_libuarte->ctrl_blk->p_cur_rx  = p_libuarte->ctrl_blk->p_next_rx;
                p_libuarte->ctrl_blk->p_next_rx = NULL;
            }
        }
    }

    if (nrf_uarte_event_check(p_libuarte->uarte, NRF_UARTE_EVENT_TXSTOPPED))
    {
        nrf_uarte_event_clear(p_libuarte->uarte, NRF_UARTE_EVENT_TXSTOPPED);
        nrf_libuarte_drv_evt_t evt = {
           .type = NRF_LIBUARTE_DRV_EVT_TX_DONE,
           .data = {
               .rxtx = {
                   .p_data = p_libuarte->ctrl_blk->p_tx,
                   .length = p_libuarte->ctrl_blk->tx_len
               }
           }
       };
       p_libuarte->ctrl_blk->p_tx = NULL;
       p_libuarte->ctrl_blk->evt_handler(p_libuarte->ctrl_blk->context, &evt);
    }

    if (nrf_uarte_event_check(p_libuarte->uarte, NRF_UARTE_EVENT_ENDTX))
    {
        nrf_uarte_event_clear(p_libuarte->uarte, NRF_UARTE_EVENT_ENDTX);
        size_t amount = nrf_uarte_tx_amount_get(p_libuarte->uarte);

        NRF_LOG_DEBUG("(evt) TX completed (%d)", amount);
        p_libuarte->ctrl_blk->tx_cur_idx += amount;
        if (p_libuarte->ctrl_blk->tx_cur_idx == p_libuarte->ctrl_blk->tx_len)
        {
            nrf_uarte_event_clear(p_libuarte->uarte, NRF_UARTE_EVENT_TXSTOPPED);
            nrf_uarte_task_trigger(p_libuarte->uarte, NRF_UARTE_TASK_STOPTX);
        }
        else
        {
            size_t rem_len = (p_libuarte->ctrl_blk->tx_len - p_libuarte->ctrl_blk->tx_cur_idx);
            if ( rem_len <= MAX_DMA_XFER_LEN)
            {
                tx_ppi_disable(p_libuarte);
            }
            else
            {
                uint8_t * p_buffer = &p_libuarte->ctrl_blk->p_tx[
                                                               p_libuarte->ctrl_blk->tx_cur_idx +
                                                               p_libuarte->ctrl_blk->tx_chunk8];
                if (nrf_uarte_event_check(p_libuarte->uarte, NRF_UARTE_EVENT_TXSTARTED) == 0)
                {
                    NRF_LOG_ERROR("Tx not started yet!");
                    ASSERT(false);
                }
                nrf_uarte_event_clear(p_libuarte->uarte, NRF_UARTE_EVENT_TXSTARTED);
                nrf_uarte_tx_buffer_set(p_libuarte->uarte,
                                        p_buffer,
                                        p_libuarte->ctrl_blk->tx_chunk8);
            }
        }

    }
}


#if NRF_LIBUARTE_DRV_UARTE0
void libuarte_0_irq_handler(void)
{
    irq_handler(m_libuarte_instance[0]);
}
#endif

#if NRF_LIBUARTE_DRV_UARTE1
void UARTE1_IRQHandler(void)
{
    irq_handler(m_libuarte_instance[1]);
}
#endif