rt-thread/bsp/sep6200/drivers/board.c

/*
 * Copyright (c) 2006-2021, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2013-7-14      Peng Fan     sep6200 implementation
 */

/**
 * @addtogroup sep6200
 */

/*@{*/
#include <rthw.h>
#include <rtthread.h>

#include <serial.h>

#include <sep6200.h>

void rt_hw_serial_putc(const char c);

#define UART0   ((struct uartport *)SEP6200_UART0_BASE)

struct rt_device uart0_device;
struct serial_int_rx uart0_int_rx;
struct serial_device uart0 =
{
    UART0,
    &uart0_int_rx,
  RT_NULL
};

/*
 * This function will handle rtos timer
 */
void rt_timer_handler(int vector, void *param)
{
    rt_uint32_t clear_int;

    /* clear timer interrupt */
    if (read_reg(SEP6200_TIMER_T2IMSR) & 0x1)
        clear_int = read_reg(SEP6200_TIMER_T2ISCR);

    rt_tick_increase();
}

/*
 * This function will handle serial interrupt
 */
void rt_serial_handler(int vector, void *param)
{
    rt_uint32_t num;
    switch (vector) {
        case INTSRC_UART0:

      /*No interrupt*/
            if ((*(RP)SEP6200_UART0_IIR & 0x1))
                return;

      /*Get the serial interrupt num*/
            num = (*(RP)SEP6200_UART0_IIR >> 1) & 0x7;

      /*Receive or timeout*/
      if ((num == 6) || (num == 2))
              rt_hw_serial_isr(&uart0_device);
            break;
        /*1,2,3 not implemented now, do in future*/
        case INTSRC_UART1:
            break;
        case INTSRC_UART2:
            break;
        case INTSRC_UART3:
            break;
    }
}

/*
 * This function will init timer2 for system ticks
 */
#define BUS4_FREQ   320000000UL
#define TIMER_CLK   BUS4_FREQ
#define HZ 100
void rt_hw_timer_init(void)
{
    *(RP)SEP6200_TIMER_T2LCR = (TIMER_CLK + HZ / 2) / HZ;
    *(RP)SEP6200_TIMER_T2CR  = 0x6;

    rt_hw_interrupt_install(INTSRC_TIMER1, rt_timer_handler, RT_NULL, "timer");
    rt_hw_interrupt_umask(INTSRC_TIMER1);

    /* start the timer */
    *(RP)SEP6200_TIMER_T2CR |= 0x1;
}

/*
 * This function will init uart
 */
#define UART_CLK 60000000UL
void rt_hw_uart_init(void)
{
    const rt_uint32_t uartclk = UART_CLK;

    *(RP)(SEP6200_UART0_LCR) = 0x83;
    *(RP)(SEP6200_UART0_DLBH) = (uartclk/16/115200) >> 8;
    *(RP)(SEP6200_UART0_DLBL) = (uartclk/16/115200) & 0xff;
    *(RP)(SEP6200_UART0_LCR) = 0x83 & (~(0x1 << 7));

    *(RP)(SEP6200_UART0_FCR) = 0x0;
    *(RP)(SEP6200_UART0_MCR) = 0x0;

    *(RP)(SEP6200_UART0_IER) = 0x0;
    /* Enable rx interrupt*/
    *(RP)(SEP6200_UART0_IER) |= 0x1;
    /* Disable tx interrupt*/
    *(RP)(SEP6200_UART0_IER) &= ~(0x1 << 1);

    rt_hw_interrupt_install(INTSRC_UART0, rt_serial_handler, RT_NULL, "uart0");
    rt_hw_interrupt_umask(INTSRC_UART0);

    rt_hw_serial_register(&uart0_device, "uart0",
            RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_STREAM,
            &uart0);
}

void rt_hw_board_init(void)
{
  int i = 0;
    rt_hw_uart_init();
    rt_hw_timer_init();
}

/*
 * Write one char to serial, must not trigger interrupt
 */
void rt_hw_serial_putc(const char c)
{
    if (c == '\n')
        rt_hw_serial_putc('\r');

    while (!((*(RP)SEP6200_UART0_LSR) & 0x40));

    *(RP)(SEP6200_UART0_TXFIFO) = c;
}

/**
* This function is used by rt_kprintf to display a string on console.
*
* @param str the displayed string^M
*/
void rt_hw_console_output(const char *str)
{
  while (*str) {
    rt_hw_serial_putc(*str++);
  }
}

/*@}*/