/*
* 程序清单： 这是一个串口设备使用例程
* 例程导出了uart_sample 命令到控制终端
* 命令调用格式： uart_sample uart2
* 命令解释： 命令第二个参数是要使用的串口设备名称， 为空则使用默认的串口设备
* 程序功能： 通过串口输出字符串"hello RT-Thread!" ， 然后错位输出输入的字符
*/
#include <rtthread.h>
#include "test_config.h"
#include <rtdevice.h>

#ifdef UART_DEMO_TEST
#define SAMPLE_UART_NAME "uart1"
/* 用于接收消息的信号量*/
static struct rt_semaphore rx_sem;
static rt_device_t serial;

/* 接收数据回调函数*/
static rt_err_t uart_input(rt_device_t dev, rt_size_t size) 
{
    /* 串口接收到数据后产生中断， 调用此回调函数， 然后发送接收信号量*/
    rt_sem_release(&rx_sem);
    return RT_EOK;
}

static void serial_thread_entry(void *parameter) 
{
    char ch;
    while (1) 
    {
        /* 从串口读取一个字节的数据， 没有读取到则等待接收信号量*/
        while (rt_device_read(serial, -1, &ch, 1) != 1) 
        {
            /* 阻塞等待接收信号量， 等到信号量后再次读取数据*/
            rt_sem_take(&rx_sem, RT_WAITING_FOREVER);
        }
        /* 读取到的数据通过串口错位输出*/
        ch = ch + 1;
        rt_device_write(serial, 0, &ch, 1);
    }
}

static int uart_sample(int argc, char *argv[]) 
{
    rt_err_t ret = RT_EOK;
    char uart_name[RT_NAME_MAX];
    char str[] = "hello BK72xx!\r\n";
	struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;

    if (argc == 2) 
    {
        rt_strncpy(uart_name, argv[1], RT_NAME_MAX);
    }
    else  
    {
        rt_strncpy(uart_name, SAMPLE_UART_NAME , RT_NAME_MAX);
    }
    
    /* 查找系统中的串口设备*/
    serial = rt_device_find(uart_name);
    if (!serial) {
        rt_kprintf("find %s failed!\n", uart_name);
        return RT_ERROR;
    }

    rt_sem_init(&rx_sem, "rx_sem", 0, RT_IPC_FLAG_FIFO);
    /* 以中断接收及轮询发送模式打开串口设备*/
    rt_device_open(serial, RT_DEVICE_FLAG_INT_RX);
    /* 设置接收回调函数*/
    rt_device_set_rx_indicate(serial, uart_input);

    /* 设置配置参数 */
    config.baud_rate = BAUD_RATE_115200;
    config.data_bits = DATA_BITS_8;
    config.stop_bits = STOP_BITS_1;
    config.parity = PARITY_NONE;
    config.bufsz = 2048;        /*can not change buffer size, must be 2048*/
    /* 打开设备后才可修改串口配置参数 */
    rt_device_control(serial, RT_DEVICE_CTRL_CONFIG, &config);

    rt_device_write(serial, 0, str, (sizeof(str) - 1));

    rt_thread_t thread = rt_thread_create("serial", serial_thread_entry , RT_NULL,1024, 25, 10);
    if (thread != RT_NULL) {
        rt_thread_startup(thread);
    }
    else {
        ret = RT_ERROR;
    }
    return ret;
}
/* 导出到msh 命令列表中*/
MSH_CMD_EXPORT(uart_sample, uart device sample);
#endif