rs485.c

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void Test_rs485()
{
int8 i;
	puts("Please connect the RS485 cable\n");
	puts("Please turned switch en485 on\n");
	output_low(en485);
	puts("Then RS485 is sending\n");
	for(i = 0;i < 100; i++)
	{
		putc(i);
	}
	puts("\nThen RS485 is reveiving\n");
	puts("press ESC to return\n");
	output_high(en485);
	while(1)
	{
		if(kbhit())
		{
			i = getc();
			if(i == ESC_KEY)
			{
				output_low(en485);
				puts("RS485 test is complete\n");
				output_high(en485);
				output_float(en485);
				return;
			}	
			else
			{
				output_low(en485);
				putc(i);
				puts("\n");
				output_high(en485);
			}
		}	
	}
}