rt-thread-official/bsp/ls1cdev/drivers/drv_uart.c

/*
 * File      : drv_uart.c
 * This file is part of RT-Thread RTOS
 * COPYRIGHT (C) 2008 - 2016, RT-Thread Development Team
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Change Logs:
 * Date           Author       Notes
 * 2018-05-08     zhuangwei    the first version
 */
#include <rtthread.h>
#include <rtdevice.h>
#include <rthw.h>
#include "drv_uart.h"
#include "ls1c_pin.h"
#include "ls1c_uart.h"

/* STM32 uart driver */
struct rt_uart_ls1c
{
    ls1c_uart_t UARTx;
    rt_uint32_t IRQ;
};

static rt_err_t ls1c_uart_configure(struct rt_serial_device *serial, struct serial_configure *cfg)
{
    struct rt_uart_ls1c *uart_dev = RT_NULL;
    ls1c_uart_info_t uart_info = {0};

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

    uart_dev = (struct rt_uart_ls1c *)serial->parent.user_data;

    // 初始化串口
    uart_info.UARTx    = uart_dev->UARTx;
    uart_info.baudrate = cfg->baud_rate;
    uart_info.rx_enable = TRUE;
    uart_init(&uart_info);

    return RT_EOK;

}

static rt_err_t ls1c_uart_control(struct rt_serial_device *serial, int cmd, void *arg)
{
    struct rt_uart_ls1c *uart_dev = RT_NULL;

    RT_ASSERT(serial != RT_NULL);
    uart_dev = (struct rt_uart_ls1c *)serial->parent.user_data;

    switch (cmd)
    {
    case RT_DEVICE_CTRL_CLR_INT: /* disable rx irq */
        rt_hw_interrupt_mask(uart_dev->IRQ);
        break;

    case RT_DEVICE_CTRL_SET_INT: /* enable rx irq */
        rt_hw_interrupt_umask(uart_dev->IRQ);
        break;

    default:
        break;
    }

    return RT_EOK;

}

static int ls1c_uart_putc(struct rt_serial_device *serial, char c)
{
    struct rt_uart_ls1c *uart_dev = RT_NULL;

    RT_ASSERT(serial != RT_NULL);

    uart_dev = (struct rt_uart_ls1c *)serial->parent.user_data;
    uart_putc(uart_dev->UARTx, c);

    return 1;
}

static int ls1c_uart_getc(struct rt_serial_device *serial)
{
    struct rt_uart_ls1c *uart_dev = RT_NULL;

    RT_ASSERT(serial != RT_NULL);

    uart_dev = (struct rt_uart_ls1c *)serial->parent.user_data;
    void *uart_base = uart_get_base(uart_dev->UARTx);

    if (LSR_RXRDY & reg_read_8(uart_base + LS1C_UART_LSR_OFFSET))
    {
        return reg_read_8(uart_base + LS1C_UART_DAT_OFFSET);
    }

    return -1;
}

/* UART interrupt handler */
static void uart_irq_handler(int vector, void *param)
{
    struct rt_serial_device *serial = (struct rt_serial_device *)param;
    struct rt_uart_ls1c *uart_dev = RT_NULL;

    RT_ASSERT(serial != RT_NULL);

    uart_dev = (struct rt_uart_ls1c *)serial->parent.user_data;
    void *uart_base = uart_get_base(uart_dev->UARTx);
    unsigned char iir = reg_read_8(uart_base + LS1C_UART_IIR_OFFSET);

    // 判断是否为接收超时或接收到有效数据
    if ((IIR_RXTOUT & iir) || (IIR_RXRDY & iir))
    {
        rt_interrupt_enter();
        rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_IND);
        rt_interrupt_leave();
    }

}

static const struct rt_uart_ops stm32_uart_ops =
{
    ls1c_uart_configure,
    ls1c_uart_control,
    ls1c_uart_putc,
    ls1c_uart_getc,
};

#if defined(RT_USING_UART2)
struct rt_uart_ls1c uart2 =
{
    LS1C_UART2,
    LS1C_UART2_IRQ,
};
struct rt_serial_device serial2;
#endif /* RT_USING_UART1 */

void rt_hw_uart_init(void)
{
    struct rt_uart_ls1c *uart;
    struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;

#ifdef RT_USING_UART2
    uart = &uart2;

    serial2.ops    = &stm32_uart_ops;
    serial2.config = config;

    pin_set_purpose(36, PIN_PURPOSE_OTHER);
    pin_set_purpose(37, PIN_PURPOSE_OTHER);
    pin_set_remap(36, PIN_REMAP_SECOND);
    pin_set_remap(37, PIN_REMAP_SECOND);

    rt_hw_interrupt_install(uart->IRQ, uart_irq_handler, &serial2, "UART2");

    /* register UART1 device */
    rt_hw_serial_register(&serial2,
                          "uart2",
                          //RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_DMA_RX,
                          RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
                          uart);
#endif /* RT_USING_UART1 */
}