瑞萨RA6M4开发板在RT-Thread中使用segger_rtt软件包

rtconfg.h
// 修改RT_CONSOLE_DEVICE_NAME为空

shell.c [ 路径:D:\rt-thread\components\finsh\shell.c]
/* 1、首先添加以下头文件 */
#include "SEGGER_RTT.h"
#include "SEGGER_RTT_Conf.h"
/* 2、修改finsh_getchar */
int finsh_getchar(void)
{
#ifdef RT_USING_DEVICE
    char ch = 0;
#ifdef RT_USING_POSIX_STDIO
    if(read(STDIN_FILENO, &ch, 1) > 0)
    {
        return ch;
    }
    else
    {
        return -1; /* EOF */
    }
#else
    rt_device_t device;
    RT_ASSERT(shell != RT_NULL);
    device = shell->device;
    if (device == RT_NULL)
    {
        extern char rt_hw_console_getchar(void);
        return rt_hw_console_getchar();
    }
    while (rt_device_read(device, -1, &ch, 1) != 1)
    {
        rt_sem_take(&shell->rx_sem, RT_WAITING_FOREVER);
        if (shell->device != device)
        {
            device = shell->device;
            if (device == RT_NULL)
            {
                return -1;
            }
        }
    }
    return ch;
#endif /* RT_USING_POSIX_STDIO */
#else
    extern char rt_hw_console_getchar(void);
    return rt_hw_console_getchar();
#endif /* RT_USING_DEVICE */
}

kservice.c [ 路径:\rt-thread\src\kservice.c ]
// 另外我们还需要完成对控制台字符读取的对接，修改rt_hw_console_output 
RT_WEAK void rt_hw_console_output(const char *str)
{
    /* empty console output */
    rt_size_t i = 0, size = 0;
    size = rt_strlen(str);
    for (i = 0; i < size; i++)
    {
        if (*(str + i) == '\n')
        {
           break;
        }
    }
    SEGGER_RTT_printf(0,"%s",str);
}
RTM_EXPORT(rt_hw_console_output);