rt-thread-official/libcpu/arm/sep4020/serial.h

/*
 * Copyright (c) 2006-2021, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2006-03-13     Bernard      first version
 * 2009-04-20     yi.qiu      modified according bernard's stm32 version
 * 2010-10-6      wangmeng    added sep4020 surpport
 */

#ifndef __SERIAL_H__
#define __SERIAL_H__

#include <sep4020.h>

#define USTAT_RCV_READY     0x01    /* receive data ready */
#define USTAT_TXB_EMPTY     0x40    /* tx buffer empty */
#define BPS                 115200  /* serial baudrate */

#define UART_RX_BUFFER_SIZE     64
#define UART_TX_BUFFER_SIZE     64

/*For sep4020's uart have several secondary function*/
/*we use union to decribe it*/

union dlbl_fifo
{
    rt_uint32_t dlbl;
    rt_uint32_t rxfifo;
    rt_uint32_t txfifo;
};

union dlbh_ier
{
    rt_uint32_t dlbh;
    rt_uint32_t ier;
};

union iir_fcr
{
    rt_uint32_t iir;
    rt_uint32_t fcr;
};

struct serial_int_rx
{
    rt_uint8_t  rx_buffer[UART_RX_BUFFER_SIZE];
    rt_uint32_t read_index, save_index;
};

struct serial_int_tx
{
    rt_uint8_t  tx_buffer[UART_TX_BUFFER_SIZE];
    rt_uint32_t write_index, save_index;
};

typedef struct uartport
{
    union dlbl_fifo dlbl_fifo;
    union dlbh_ier  dlbh_ier;
    union iir_fcr   iir_fcr;
    rt_uint32_t lcr;
    rt_uint32_t mcr;
    rt_uint32_t lsr;
    rt_uint32_t msr;
}uartport;

struct serial_device
{
    uartport* uart_device;

    /* rx structure */
    struct serial_int_rx* int_rx;

    /* tx structure */
    struct serial_int_tx* int_tx;
};

rt_err_t rt_hw_serial_register(rt_device_t device, const char* name, rt_uint32_t flag, struct serial_device *serial);

void rt_hw_serial_isr(rt_device_t device);


#endif