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kp184.cs
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kp184.cs
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//////////////////////////////////////////////////////////////////////
// the wacky KP184 electronic load
using System;
using System.Collections.Generic;
using System.Text;
using System.IO.Ports;
using System.Threading;
//////////////////////////////////////////////////////////////////////
namespace KP184
{
public class kp184: serial_port
{
public byte address;
public load_switch switch_status;
public load_mode switch_mode;
public uint voltage;
public uint current;
public bool checksum_check = true;
//////////////////////////////////////////////////////////////////////
public enum load_mode
{
CV = 0,
CC = 1,
CR = 2,
CW = 3
};
public static string load_mode_as_string(int mode)
{
return Enum.GetName(typeof(load_mode), mode);
}
public static string load_mode_as_string(load_mode mode)
{
return Enum.GetName(typeof(load_mode), mode);
}
//////////////////////////////////////////////////////////////////////
public enum load_switch
{
off = 0,
on = 1
};
//////////////////////////////////////////////////////////////////////
// these are not normal modbus (0x03 means read the whole bank)
public enum command
{
read_registers = 0x03,
write_single = 0x06,
write_multiple = 0x16
};
//////////////////////////////////////////////////////////////////////
public enum register
{
load_switch = 0x010e,
load_mode = 0x0110,
volts = 0x0112,
current = 0x0116,
resistance = 0x011a,
watts = 0x011e,
measured_volts = 0x0122,
measured_amps = 0x0126,
dummy = 0x0122
};
//////////////////////////////////////////////////////////////////////
const int offset_voltage = 5;
const int offset_current = 8;
//////////////////////////////////////////////////////////////////////
private const int reply_delay = 50;
private static void delay()
{
Thread.Sleep(reply_delay);
}
//////////////////////////////////////////////////////////////////////
// assumes the message body is already set up
private void init_message(command type, ushort start, ushort registers, ref byte[] message)
{
message[0] = address;
message[1] = (byte)type;
message[2] = (byte)(start >> 8);
message[3] = (byte)start;
message[4] = (byte)(registers >> 8);
message[5] = (byte)registers;
checksum.set(message, message.Length);
}
//////////////////////////////////////////////////////////////////////
private void send_message(command type, ushort start, ushort registers, ref byte[] message)
{
if(address == 0)
{
throw new ApplicationException($"Device address has not been set");
}
init_message(type, start, registers, ref message);
write(message, message.Length);
}
//////////////////////////////////////////////////////////////////////
// get a checked modbus response
private byte[] get_response(int length)
{
byte[] response = new byte[length];
read(response, length);
checksum.verify(response, length, checksum_check);
return response;
}
//////////////////////////////////////////////////////////////////////
// write multiple registers to modbus
// this is untested and probably doesn't work, there's no example in the manual
public void write_multiple(register start_register, ushort num_registers, uint[] values)
{
byte[] message = new byte[9 + 4 * num_registers];
message[6] = (byte)(num_registers * 4);
int rstart = 7;
int rend = 7 + num_registers * 4;
for(int i = rstart; i < rend;)
{
message[i++] = (byte)(values[i] >> 24);
message[i++] = (byte)(values[i] >> 16);
message[i++] = (byte)(values[i] >> 8);
message[i++] = (byte)(values[i] >> 0);
}
send_message(command.write_multiple, (ushort)start_register, num_registers, ref message);
delay();
get_response(8);
}
//////////////////////////////////////////////////////////////////////
// write a single modbus register
public void write_register(register register, uint value)
{
byte[] message = new byte[11 + 2];
message[6] = sizeof(uint); //4
message[7] = (byte)(value >> 24);
message[8] = (byte)(value >> 16);
message[9] = (byte)(value >> 8);
message[10] = (byte)(value >> 0);
send_message(command.write_single, (ushort)register, 1, ref message);
delay();
get_response(9);
}
//////////////////////////////////////////////////////////////////////
// wacky special read at 0x300 means get them all and the format of the return message is... special
public byte[] get_status_bank()
{
byte[] message = new byte[8];
send_message(command.read_registers, 0x300, 0, ref message);
delay();
byte[] x = get_response(23);
return x;
}
//////////////////////////////////////////////////////////////////////
// get the KP184 status
public void get_status()
{
byte[] response = get_status_bank();
if(response != null)
{
switch_status = (load_switch)(response[3] & 1);
switch_mode = (load_mode)((response[3] >> 1) & 3); // TODO (chs): then look this up, the values in the status are wacky
voltage = ((uint)response[offset_voltage] << 16) | ((uint)response[offset_voltage + 1] << 8) | response[offset_voltage + 2];
current = ((uint)response[offset_current] << 16) | ((uint)response[offset_current + 1] << 8) | response[offset_current + 2];
Log.Info("Status:");
Log.Info($" Switch is {switch_status}");
Log.Info($" Mode is {load_mode_as_string(switch_mode)}");
Log.Info($" Current is {current}");
Log.Info($" Voltage is {voltage}");
}
}
//////////////////////////////////////////////////////////////////////
// helpers
public void set_current(uint milliamps)
{
Log.Verbose($"Set current to {milliamps}mA");
write_register(register.current, milliamps);
}
public void set_power(uint watt)
{
Log.Verbose($"Set watt to {watt}dW");
write_register(register.watts, watt);
}
public void set_resistance(uint ohms)
{
Log.Verbose($"Set resistance to {ohms}Ohm");
write_register(register.resistance, ohms);
}
public void set_mode(load_mode mode)
{
Log.Verbose($"Set mode to {mode}");
write_register(register.load_mode, (uint)mode);
}
public void set_load_switch(load_switch on_or_off)
{
Log.Verbose($"Set switch {on_or_off}");
write_register(register.load_switch, (uint)on_or_off);
}
public int get_load_switch()
{
Log.Verbose($"Get load switch");
byte[] response = get_status_bank();
if (response != null)
{
switch_status = (load_switch)(response[3] & 1);
}
return (int)switch_status;
}
public int get_mode()
{
Log.Verbose($"Get mode");
byte[] response = get_status_bank();
if (response != null)
{
switch_mode = (load_mode)((response[3] >> 1) & 3);
}
return (int)switch_mode;
}
public int get_voltage()
{
Log.Verbose($"Get voltage");
byte[] response = get_status_bank();
if (response != null)
{
voltage = ((uint)response[offset_voltage] << 16) | ((uint)response[offset_voltage + 1] << 8) | response[offset_voltage + 2];
}
return (int)voltage;
}
public int get_current()
{
Log.Verbose($"Get current");
byte[] response = get_status_bank();
if (response != null)
{
current = ((uint)response[offset_current] << 16) | ((uint)response[offset_current + 1] << 8) | response[offset_current + 2];
}
return (int)current;
}
}
}