drv_uarte.c

/*
 * Copyright (c) 2006-2021, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2020-04-28     xckhmf       Modify for <nrfx>
 * 2020-10-31     xckhmf       Support for UART1
 *
 */
#include <rtdevice.h>
#include <nrfx_uarte.h>
#include "drv_uart.h"

#ifdef BSP_USING_UART
#if defined(BSP_USING_UART0) || defined(BSP_USING_UART1)
typedef struct
{
    struct rt_serial_device *serial;
    nrfx_uarte_t uarte_instance;
    uint8_t rx_length;
    uint8_t tx_buffer[1];
    uint8_t rx_buffer[1];
    bool isInit;
    uint32_t rx_pin;
    uint32_t tx_pin;
} drv_uart_cb_t;

#ifdef BSP_USING_UART0
static struct rt_serial_device m_serial_0;
drv_uart_cb_t m_uarte0_cb = {
    .uarte_instance = NRFX_UARTE_INSTANCE(0),
    .rx_length = 0,
    .rx_pin = BSP_UART0_RX_PIN,
    .tx_pin = BSP_UART0_TX_PIN,
    .isInit = false
};
#endif  /* BSP_USING_UART0 */

#ifdef BSP_USING_UART1
static struct rt_serial_device m_serial_1;
drv_uart_cb_t m_uarte1_cb = {
    .uarte_instance = NRFX_UARTE_INSTANCE(1),
    .rx_length = 0,
    .rx_pin = BSP_UART1_RX_PIN,
    .tx_pin = BSP_UART1_TX_PIN,
    .isInit = false
};
#endif  /* BSP_USING_UART1 */

static void uarte_evt_handler(nrfx_uarte_event_t const * p_event,
                              void *                     p_context)
{
    drv_uart_cb_t *p_cb = RT_NULL;
    p_cb = (drv_uart_cb_t*)p_context;
    switch (p_event->type)
    {
        case NRFX_UARTE_EVT_RX_DONE:
            p_cb->rx_length = p_event->data.rxtx.bytes;
            if(p_cb->serial->parent.open_flag&RT_DEVICE_FLAG_INT_RX)
            {
                rt_hw_serial_isr(p_cb->serial, RT_SERIAL_EVENT_RX_IND);
            }
            (void)nrfx_uarte_rx(&(p_cb->uarte_instance), p_cb->rx_buffer, 1);
            break;

        case NRFX_UARTE_EVT_ERROR:
            (void)nrfx_uarte_rx(&(p_cb->uarte_instance), p_cb->rx_buffer, 1);
            break;

        case NRFX_UARTE_EVT_TX_DONE:
            if(p_cb->serial->parent.open_flag&RT_DEVICE_FLAG_INT_TX)
            {
                rt_hw_serial_isr(p_cb->serial, RT_SERIAL_EVENT_TX_DONE);
            }
            break;

        default:
            break;
    }
}

static rt_err_t _uart_cfg(struct rt_serial_device *serial, struct serial_configure *cfg)
{
    nrfx_uarte_config_t config = NRFX_UARTE_DEFAULT_CONFIG(NRF_UARTE_PSEL_DISCONNECTED,\
                                                            NRF_UARTE_PSEL_DISCONNECTED);

    drv_uart_cb_t *p_cb = RT_NULL;

    RT_ASSERT(serial != RT_NULL);
    RT_ASSERT(cfg != RT_NULL);

    if (serial->parent.user_data == RT_NULL)
    {
        return -RT_ERROR;
    }
    p_cb = (drv_uart_cb_t*)serial->parent.user_data;
    if(p_cb->isInit)
    {
        nrfx_uarte_uninit(&(p_cb->uarte_instance));
        p_cb->isInit = false;
    }

    switch (cfg->baud_rate)
    {
    case BAUD_RATE_2400:
        config.baudrate = NRF_UARTE_BAUDRATE_2400;
        break;
    case BAUD_RATE_4800:
        config.baudrate = NRF_UARTE_BAUDRATE_4800;
        break;
    case BAUD_RATE_9600:
        config.baudrate = NRF_UARTE_BAUDRATE_9600;
        break;
    case BAUD_RATE_19200:
        config.baudrate = NRF_UARTE_BAUDRATE_19200;
        break;
    case BAUD_RATE_38400:
        config.baudrate = NRF_UARTE_BAUDRATE_38400;
        break;
    case BAUD_RATE_57600:
        config.baudrate = NRF_UARTE_BAUDRATE_57600;
        break;
    case BAUD_RATE_115200:
        config.baudrate = NRF_UARTE_BAUDRATE_115200;
        break;
    case BAUD_RATE_230400:
        config.baudrate = NRF_UARTE_BAUDRATE_230400;
        break;
    case BAUD_RATE_460800:
        config.baudrate = NRF_UARTE_BAUDRATE_460800;
        break;
    case BAUD_RATE_921600:
        config.baudrate = NRF_UARTE_BAUDRATE_921600;
        break;
    case BAUD_RATE_2000000:
    case BAUD_RATE_3000000:
        return -RT_EINVAL;
    default:
        config.baudrate = NRF_UARTE_BAUDRATE_115200;
        break;
    }
    config.hal_cfg.parity = (cfg->parity == PARITY_NONE)?\
                            NRF_UARTE_PARITY_EXCLUDED:NRF_UARTE_PARITY_INCLUDED;
    config.hal_cfg.hwfc = NRF_UARTE_HWFC_DISABLED;
    config.pselrxd = p_cb->rx_pin;
    config.pseltxd = p_cb->tx_pin;
    config.p_context = (void *)p_cb;

    nrfx_uarte_init(&(p_cb->uarte_instance),(nrfx_uarte_config_t const *)&config,uarte_evt_handler);
    nrfx_uarte_rx(&(p_cb->uarte_instance),p_cb->rx_buffer,1);
    p_cb->isInit = true;
    return RT_EOK;
}

static rt_err_t _uart_ctrl(struct rt_serial_device *serial, int cmd, void *arg)
{
    drv_uart_cb_t *p_cb = RT_NULL;
    RT_ASSERT(serial != RT_NULL);

    if (serial->parent.user_data == RT_NULL)
    {
        return -RT_ERROR;
    }
    p_cb = (drv_uart_cb_t*)serial->parent.user_data;

    switch (cmd)
    {
        /* disable interrupt */
    case RT_DEVICE_CTRL_CLR_INT:
        break;

        /* enable interrupt */
    case RT_DEVICE_CTRL_SET_INT:
        break;

    case RT_DEVICE_CTRL_CUSTOM:
        if ((rt_uint32_t)(arg) == UART_CONFIG_BAUD_RATE_9600)
        {
            p_cb->serial->config.baud_rate = 9600;
        }
        else if ((rt_uint32_t)(arg) == UART_CONFIG_BAUD_RATE_115200)
        {
            p_cb->serial->config.baud_rate = 115200;
        }
        _uart_cfg(serial, &(serial->config));
        break;

    case RT_DEVICE_CTRL_PIN:
        _uart_cfg(serial, &(serial->config));
        break;

    case RT_DEVICE_POWERSAVE:
        if(p_cb->isInit)
        {
            nrfx_uarte_uninit(&(p_cb->uarte_instance));
            p_cb->isInit = false;
        }
        break;

    case RT_DEVICE_WAKEUP:
        _uart_cfg(serial, &(serial->config));
        break;

    default:
        return -RT_ERROR;
    }

    return RT_EOK;
}

static int _uart_putc(struct rt_serial_device *serial, char c)
{
    drv_uart_cb_t *p_cb = RT_NULL;
    int rtn = -1;
    RT_ASSERT(serial != RT_NULL);

    if (serial->parent.user_data != RT_NULL)
    {
        p_cb = (drv_uart_cb_t*)serial->parent.user_data;
    }
    p_cb->tx_buffer[0] = c;
    nrfx_uarte_tx(&(p_cb->uarte_instance),p_cb->tx_buffer,1);
    if(!(serial->parent.open_flag&RT_DEVICE_FLAG_INT_TX))
    {
        while(nrfx_uarte_tx_in_progress(&(p_cb->uarte_instance)))
        {
        }
    }
    return rtn;
}

static int _uart_getc(struct rt_serial_device *serial)
{
    int ch = -1;
    drv_uart_cb_t *p_cb = RT_NULL;
    RT_ASSERT(serial != RT_NULL);

    if (serial->parent.user_data != RT_NULL)
    {
        p_cb = (drv_uart_cb_t*)serial->parent.user_data;
    }
    if(p_cb->rx_length)
    {
        ch = p_cb->rx_buffer[0];
        p_cb->rx_length--;
    }
    return ch;
}

static struct rt_uart_ops _uart_ops = {
    _uart_cfg,
    _uart_ctrl,
    _uart_putc,
    _uart_getc
};

void rt_hw_uart_init(void)
{
    struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;

#ifdef BSP_USING_UART0
    m_serial_0.config = config;
    m_serial_0.ops = &_uart_ops;
    m_uarte0_cb.serial = &m_serial_0;
    rt_hw_serial_register(&m_serial_0, "uart0", \
                            RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX ,  &m_uarte0_cb);
#endif  /* BSP_USING_UART0 */

#ifdef BSP_USING_UART1
    m_serial_1.config = config;
    m_serial_1.ops = &_uart_ops;
    m_uarte1_cb.serial = &m_serial_1;
    rt_hw_serial_register(&m_serial_1, "uart1", \
                            RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX |RT_DEVICE_FLAG_INT_TX,  &m_uarte1_cb);
#endif  /* BSP_USING_UART1 */

}
#endif /* defined(BSP_USING_UART0) || defined(BSP_USING_UART1) */
#endif /* BSP_USING_UART */