I'm doing a school project where I need to pass notes (char, ascii) using a C# code in VS to an Altera card using a RS232 cable. when I'm sending a single note('A') the data goes through just fine but when I'm trying to send two notes at the same time ("AB") the data isn't receive well enough and I'm getting multiple problems like the wrong Leds turning on and off.
My VHDL code
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
entity UART_RX is
-- clockls per bit = 50Mhz/9600baudrate
generic(
gClocks_per_Bit : integer := 5208
);
port(
iClk : in std_logic;
iReset : in std_logic;
iRX : in std_logic:='0';
led1,led2 : out std_logic:='0';
oTX : out std_logic_vector (7 downto 0)
);
end UART_RX;
architecture Behavioral of UART_RX is
type uart_rx_type is (idle,start,data,stop);
signal sNext_state : uart_rx_type := idle;
signal sClock_counter : integer range 0 to gClocks_per_Bit := 0;
signal sIndex : integer range 0 to 15 := 0;
signal sTemp : std_logic_vector (15 downto 0);
signal receiver1, receiver2 : std_logic_vector (7 downto 0);
signal oTX_1 : std_logic_vector (7 downto 0);
begin
process(iClk,iReset)
begin
if(iReset = '0') then
sIndex <= 0;
sClock_counter <= 0;
elsif(rising_edge(iClk)) then
case sNext_state is
when idle =>
sClock_counter <= 0;
sIndex <= 0;
if(iRX = '0') then
sNext_state <= start;
elsif(iRX = '1') then
sNext_state <= idle;
end if;
when start =>
if(sClock_counter < gClocks_per_Bit) then
sClock_counter <= sClock_counter + 1;
if(sClock_counter = gClocks_per_Bit/2 AND iRX ='0') then
sNext_state <= start;
elsif(sClock_counter = gClocks_per_Bit/2 AND iRX ='1') then
sClock_counter <= 0;
sNext_state <= idle;
end if;
sNext_state <= start;
else
sClock_counter <= 0;
sNext_state <= data;
end if;
when data =>
if(sClock_counter < gClocks_per_Bit) then
sClock_counter <= sClock_counter + 1;
sNext_state <= data;
if(sClock_counter = gClocks_per_Bit/2) then
sTemp(sindex)<= iRX;
end if;
else
sClock_counter <= 0;
if(sIndex < 15) then
sIndex <= sIndex + 1;
sNext_state <= data;
else
sIndex <= 0;
sNext_state <= stop;
end if;
end if;
when stop =>
if(sClock_counter = gClocks_per_Bit / 2) then
sClock_counter <= 0;
sNext_state <= idle;
elsif(sClock_counter < gClocks_per_Bit) then
sClock_counter <= sClock_counter + 1;
end if;
when others => null;
end case;
end if;
end process;
receiver1<=sTemp(7 downto 0);
receiver2<=sTemp(15 downto 8);
-- oTX <= sTemp;
process(receiver1,receiver2,iReset)
begin
if iReset = '0' then
led2<='0';
led1<='0';
elsif receiver1 = "01000001" then -- A (led 1 on)
led2 <= '0';
led1 <= '1';
elsif receiver1 = "01000010" then -- B
led2 <= '1';
led1 <= '0';
elsif receiver1 = "01000011" then -- C
led2 <= '0';
led1 <= '0';
elsif sTemp = "0100000101000010" then -- AB
led2 <= '1';
led1 <= '1';
else -- What Ever You Write Turns Off/On Leds.
null;
end if;
end process;
oTX <= sTemp(7 downto 0);
end Behavioral ;
My C# code
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO.Ports;
using System.Threading;
namespace COMPORT
{
public partial class Form1 : Form
{
string dataOUT;
public Form1()
{
InitializeComponent();
}
private void comboBox5_SelectedIndexChanged(object sender, EventArgs e)
{
}
private void button1_Click(object sender, EventArgs e)
{
try
{
serialPort1.PortName = cBoxCOMPORT.Text;
serialPort1.BaudRate = Convert.ToInt32(CBoxBaudRate.Text);
serialPort1.DataBits = Convert.ToInt32(cBoxDataBits.Text);
serialPort1.StopBits = (StopBits)Enum.Parse(typeof(StopBits), cBoxStopBits.Text);
serialPort1.Parity = (Parity)Enum.Parse(typeof(Parity), cBoxParityBits.Text);
serialPort1.Open();
progressBar1.Value = 100;
}
catch (Exception err)
{
MessageBox.Show(err.Message,"Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
private void btnClose_Click(object sender, EventArgs e)
{
if(serialPort1.IsOpen)
{
serialPort1.Close();
progressBar1.Value = 0;
}
}
private void Form1_Load(object sender, EventArgs e)
{
string[] ports = SerialPort.GetPortNames();
cBoxCOMPORT.Items.AddRange(ports);
}
private void btnSendData_Click(object sender, EventArgs e)
{
if(serialPort1.IsOpen)
{
dataOUT = tBoxDataOut.Text;
//dataOUT = ConvertToHex(dataOUT);
//dataOUT = hex2binary(dataOUT);
serialPort1.Write(dataOUT);
Thread.Sleep((int)TimeSpan.FromSeconds(2).TotalMilliseconds);
MessageBox.Show(dataOUT);
}
}
private void tBoxDataOut_TextChanged(object sender, EventArgs e)
{
}
private void timer1_Tick(object sender, EventArgs e)
{
this.Text = DateTime.Now.ToString();
}
//public static string ConvertToHex(string asciiString)
//{
// string bin = "";
// foreach (char c in asciiString)
// {
// int tmp = c;
// bin += String.Format("{0:x2}", (uint)System.Convert.ToUInt32(tmp.ToString()));
// }
// return bin;
//}
//private string hex2binary(string hexvalue)
//{
// string binaryval = "";
// binaryval = Convert.ToString(Convert.ToInt32(hexvalue, 16), 2);
// return binaryval;
//}
}
}
thanks in advance
Tried looking online but what I look for is really specific.
