#include <stdint.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <getopt.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/types.h>
#include <string.h>
#include <termios.h>

#define FY_TRUE     1
#define FY_FALSE    0
static char device[128] = "/dev/ttyS2";

void SAMPLE_UART_Usage(void)
{
	printf("please choose the case which you want to run:\n");
	printf("\t1:  UART Send Test\n");
	printf("\t2:  UART Recv Test\n");

	printf("\n");
	printf("================================================================\n");
}

int send_test(int fd,char *s)
{
	int len = 0;
	//检查发送的字符
	printf("send data:%s\n", s);
	len = strlen(s);
	write(fd, s, len);
	return 0;
}

void recv_test(int fd,char *s)
{
	int len = 0;
	//检测串口接收缓存区中的字符
	while((len = read(fd, s, 12)) != 0){
		s[12] = '\0';
		printf("%s", s);
	}
}

int main(int argc, char *argv[])
{
	char s[] = "hello world\n";
	char s1[13] = {0};
	char ch;
	int bExit = FY_FALSE;

	//在此处打开串口设备
	if (argc > 1)
		memcpy(device, argv[1], strlen(argv[1]));

	printf("\n");
	printf("================================================================\n");
	printf("Test Device is %s\n", device);
	printf("================================================================\n");

 	int fd = open(device, O_RDWR | O_NOCTTY);
	if (fd < 0)
		printf("can't open device\n");


	while(1) {
		SAMPLE_UART_Usage();
		ch = getchar();
		if(10 == ch)
		{
			continue;
		}
		getchar();
		switch (ch)
		{
			case '1':
				send_test(fd,s);
				break;
			case '2':
				recv_test(fd,s1);
				break;
			case 'q':
			case 'Q':
			{
				bExit = FY_TRUE;
				break;
			}
			default :
				break;
		}
		if (bExit)
		{
			break;
		}
	}
	//关闭文件
	close(fd);
	return 0;
}