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lin.js
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lin.js
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/* Protocol meta info:
<NAME> LIN Bus </NAME>
<DESCRIPTION>
LIN (Local Interconnect Network) protocol analyzer
</DESCRIPTION>
<VERSION> 0.7 </VERSION>
<AUTHOR_NAME> Ibrahim KAMAL, Vladislav Kosinov </AUTHOR_NAME>
<AUTHOR_URL> i.kamal@ikalogic.com </AUTHOR_URL>
<HELP_URL> https://github.com/ikalogic/ScanaStudio-scripts-v3/wiki </HELP_URL>
<COPYRIGHT> Copyright Ibrahim KAMAL, Vladislav Kosinov </COPYRIGHT>
<LICENSE> This code is distributed under the terms of the GNU General Public License GPLv3 </LICENSE>
<RELEASE_NOTES>
v0.7: Fixed bug (error in SYNC field interpretation)
v0.6: Added more information about invlid sync fields
V0.5: Added hex and packet views
V0.3: Added dec_item_end() for each dec_item_new()
V0.2: Added decoder GUI validation function
V0.1: Initial release
</RELEASE_NOTES>
*/
/*
Todo in future releases
-----------------------
* Add trigger generator support
* Add online documentation
* Add signal builder support
*/
var FRAME_ID =
{
CONFIG_0 : 0x3C,
CONFIG_1 : 0x3D,
RESERVED_0 : 0x3E,
RESERVED_1 : 0x3F
};
var ID_FIELD_MASK =
{
PARITY : 0xC0,
PARITY_0 : 0x40,
PARITY_1 : 0x80,
ID : 0x3F
};
//Decoder GUI
function on_draw_gui_decoder()
{
//Define decoder configuration GUI
ScanaStudio.gui_add_ch_selector("ch_lin","LIN bus ch_lin","LIN");
ScanaStudio.gui_add_new_tab("Advanced options",false);
ScanaStudio.gui_add_combo_box("lin_spec","LIN Specifications version");
ScanaStudio.gui_add_item_to_combo_box("LIN V1.x",false);
ScanaStudio.gui_add_item_to_combo_box("LIN V2.x",true);
ScanaStudio.gui_add_combo_box("id_format","ID display format");
ScanaStudio.gui_add_item_to_combo_box("HEX",true);
ScanaStudio.gui_add_item_to_combo_box("Binary",false);
ScanaStudio.gui_add_item_to_combo_box("Decimal",false);
ScanaStudio.gui_add_combo_box("parity_format","Parity display format");
ScanaStudio.gui_add_item_to_combo_box("HEX",false);
ScanaStudio.gui_add_item_to_combo_box("Binary",true);
ScanaStudio.gui_add_item_to_combo_box("Decimal",false);
ScanaStudio.gui_add_combo_box("data_format","Data display format");
ScanaStudio.gui_add_item_to_combo_box("HEX",true);
ScanaStudio.gui_add_item_to_combo_box("Binary",false);
ScanaStudio.gui_add_item_to_combo_box("Decimal",false);
ScanaStudio.gui_end_tab();
}
//Evaluate decoder GUI
function on_eval_gui_decoder()
{
ch_lin = ScanaStudio.gui_get_value("ch_lin");
ScanaStudio.set_script_instance_name("LIN on Ch: " + (ch_lin+1).toString());
return "" //All good.
}
//Global variables
var sampling_rate;
var state_machine;
var chksum_bytes = [];
var finished = false;
function on_decode_signals (resume)
{
if (!resume) //If resume == false, it's the first call to this function.
{
//initialization code goes here, ex:
state_machine = 0;
sampling_rate = ScanaStudio.get_capture_sample_rate();
// read GUI values using ScanaStudio.gui_get_value("ID");
ch_lin = ScanaStudio.gui_get_value("ch_lin");
lin_spec = ScanaStudio.gui_get_value("lin_spec");
id_format = ScanaStudio.gui_get_value("id_format");
parity_format = ScanaStudio.gui_get_value("parity_format");
data_format = ScanaStudio.gui_get_value("data_format");
cursor = 1;
break_width = 0;
bit_counter = 0;
n_lin_bytes = 0;
byte_counter = 0;
last_sync_bit_width = 0;
first_sync_edge = 0;
sync_bit_width = 0;
samples_per_bit = 0;
min_break_width = 11*sampling_rate/(20e3);//11 bits @ 20KBAUD, expressed in samples
chksum_bytes = [];
ScanaStudio.trs_reset(ch_lin);
}
while (ScanaStudio.trs_is_not_last(ch_lin))
{
if ((ScanaStudio.abort_is_requested() == true) || finished)
{
return;
}
switch (state_machine)
{
case 0: //Seach for break falling edge
trs = ScanaStudio.trs_get_next(ch_lin);
if ((trs.value == 0) && (trs.sample_index >= cursor)) //found!
{
cursor = trs.sample_index;
state_machine++;
}
break;
case 1: //search for end of break;
break_start = cursor;
trs = ScanaStudio.trs_get_next(ch_lin);
if ((trs.value == 1) && (trs.sample_index >= cursor)) //found!
{
break_width = trs.sample_index - cursor;
cursor = trs.sample_index;
ScanaStudio.packet_view_add_packet(true, ch_lin, break_start, -1, "LIN", "CH" + (ch_lin + 1),
ScanaStudio.get_channel_color(ch_lin), ScanaStudio.get_channel_color(ch_lin));
if (break_width > min_break_width)
{
ScanaStudio.dec_item_new(ch_lin, break_start, cursor);
ScanaStudio.dec_item_add_content("BREAK");
ScanaStudio.dec_item_add_content("BRK");
ScanaStudio.dec_item_add_content("B");
ScanaStudio.dec_item_end();
ScanaStudio.packet_view_add_packet(false, ch_lin, break_start, cursor, "Break", "",
ScanaStudio.PacketColors.Wrap.Title, ScanaStudio.PacketColors.Wrap.Content);
bit_counter = 0;
state_machine++;
}
else
{
//invalid break
ScanaStudio.dec_item_new(ch_lin,break_start,cursor);
ScanaStudio.dec_item_add_content("INVALID BREAK (too short)");
ScanaStudio.dec_item_add_content("INVALID BREAK");
ScanaStudio.dec_item_add_content("! BREAK");
ScanaStudio.dec_item_add_content("!");
ScanaStudio.dec_item_emphasize_error();
ScanaStudio.dec_item_end();
ScanaStudio.packet_view_add_packet(false, ch_lin, break_start, cursor, "Invalid Break", "(too short)",
ScanaStudio.PacketColors.Error.Title, ScanaStudio.PacketColors.Error.Content);
//ScanaStudio.console_info_msg("Invalid break",cursor);
state_machine = 0;
}
}
break;
case 2: //Search for sync bits
trs = ScanaStudio.trs_get_next(ch_lin);
last_sync_bit_width = sync_bit_width;
sync_bit_width = trs.sample_index - cursor;
cursor = trs.sample_index;
//ScanaStudio.console_info_msg("bit_counter="+bit_counter,cursor);
if (bit_counter == 0)
{
first_sync_edge = cursor;
}
else if (bit_counter == 1)
{
sync_start = cursor;
}
else if (bit_counter == 9)
{
sync_end = cursor;
}
bit_counter++;
if ((bit_counter > 2) && (bit_counter < 11) && ((Math.abs(last_sync_bit_width - sync_bit_width) / sync_bit_width) > 0.3)) //More than 40% variation
{
//It's not valid SYNC field
ScanaStudio.dec_item_new(ch_lin, first_sync_edge, cursor);
ScanaStudio.dec_item_add_content("INVALID SYNC (unstable bit rate)");
ScanaStudio.dec_item_add_content("! SYNC");
ScanaStudio.dec_item_add_content("!");
ScanaStudio.dec_item_emphasize_error();
ScanaStudio.dec_item_end();
ScanaStudio.packet_view_add_packet(false, ch_lin, first_sync_edge, cursor, "Invalid Sync", "(unstable bit rate)",
ScanaStudio.PacketColors.Error.Title, ScanaStudio.PacketColors.Error.Content);
//ScanaStudio.console_info_msg("Ivalid sync filed:"+last_sync_bit_width+"/"+sync_bit_width,cursor);
state_machine = 0;
}
else if ((bit_counter > 1) && (sync_bit_width > (break_width * 0.20)))
{
ScanaStudio.dec_item_new(ch_lin, first_sync_edge, cursor);
ScanaStudio.dec_item_add_content("INVALID SYNC (incoherent with BREAK width)");
ScanaStudio.dec_item_add_content("! SYNC");
ScanaStudio.dec_item_add_content("!");
ScanaStudio.dec_item_emphasize_error();
ScanaStudio.dec_item_end();
ScanaStudio.packet_view_add_packet(false, ch_lin, first_sync_edge, cursor, "Invalid Sync", "(incoherent with BREAK)",
ScanaStudio.PacketColors.Error.Title, ScanaStudio.PacketColors.Error.Content);
// ScanaStudio.console_info_msg("Ivalid sync filed(2):"+sync_bit_width+"/"+break_width,cursor);
state_machine = 0;
}
else if (bit_counter >= 11)
{
// Calculate baud rate as the average bit time in the sync field
samples_per_bit = Math.floor((cursor - first_sync_edge) / 10);
var baud = Math.floor(sampling_rate / samples_per_bit);
ScanaStudio.dec_item_new(ch_lin, first_sync_edge, sync_start);
ScanaStudio.dec_item_add_content("START");
ScanaStudio.dec_item_add_content("S");
ScanaStudio.dec_item_end();
ScanaStudio.dec_item_new(ch_lin, sync_start, sync_end);
ScanaStudio.dec_item_add_content("SYNC Field (BAUD = " + baud.toString() + ")");
ScanaStudio.dec_item_add_content("SYNC");
ScanaStudio.dec_item_add_content("S");
ScanaStudio.dec_item_end();
ScanaStudio.packet_view_add_packet(false, ch_lin, sync_start, sync_end, "Sync", baud.toString() + " baud(s)",
ScanaStudio.PacketColors.Head.Title, ScanaStudio.PacketColors.Head.Content);
ScanaStudio.dec_item_new(ch_lin, sync_end, cursor);
ScanaStudio.dec_item_add_content("STOP");
ScanaStudio.dec_item_add_content("P");
ScanaStudio.dec_item_end();
//ScanaStudio.console_info_msg("Sync ok, baud = " + baud);
ScanaStudio.bit_sampler_init(ch_lin, cursor + (samples_per_bit * 0.5), samples_per_bit);
chksum_bytes = [];
state_machine++;
}
break;
case 3: //get PID field
if (ScanaStudio.get_available_samples(ch_lin) > (cursor + (samples_per_bit * 13)))
{
//Get Start bit
lin_start = ScanaStudio.bit_sampler_next(ch_lin);
//get 6-bit ID
lin_id = 0;
for (bit_counter = 0; bit_counter < 6; bit_counter++)
{
bit_value = ScanaStudio.bit_sampler_next(ch_lin);
lin_id += Math.pow(2, bit_counter) * bit_value;
}
//ScanaStudio.console_info_msg("ID = " + lin_id.toString(16),cursor);
//Get 2-bit parity
lin_par = 0;
for (bit_counter = 0; bit_counter < 2; bit_counter++)
{
bit_value = ScanaStudio.bit_sampler_next(ch_lin);
lin_par += Math.pow(2, bit_counter) * bit_value;
}
//ScanaStudio.console_info_msg("PAR = 0b " + lin_par.toString(2),cursor);
chksum_bytes.push((lin_id | (lin_par << 6)));
//Get stop bit
lin_stop = ScanaStudio.bit_sampler_next(ch_lin);
if (lin_stop == 0)
{
//ScanaStudio.console_info_msg("This is probably a BREAK (during ID)...",cursor);
//This is probably a BREAK.
state_machine = 1;
}
else
{
ScanaStudio.dec_item_new(ch_lin, cursor, cursor + samples_per_bit);
if (lin_start == 0)
{
ScanaStudio.dec_item_add_content("START");
ScanaStudio.dec_item_add_content("S");
}
else
{
ScanaStudio.dec_item_add_content("! INVALID START");
ScanaStudio.dec_item_add_content("! S");
ScanaStudio.dec_item_add_content("!");
ScanaStudio.dec_item_emphasize_error();
ScanaStudio.packet_view_add_packet(false, ch_lin, cursor, cursor + samples_per_bit, "Invalid Start", "",
ScanaStudio.PacketColors.Error.Title, ScanaStudio.PacketColors.Error.Content);
}
ScanaStudio.dec_item_end();
ScanaStudio.dec_item_new(ch_lin, cursor + (samples_per_bit * 1), cursor + (samples_per_bit * 7));
ScanaStudio.dec_item_add_content("ID = " + format_content(lin_id, id_format, 6) + " Data LEN = " + get_lin_data_len(lin_id));
ScanaStudio.dec_item_add_content("ID = " + format_content(lin_id, id_format, 6) + " L = " + get_lin_data_len(lin_id));
ScanaStudio.dec_item_add_content("ID = " + format_content(lin_id, id_format, 6));
ScanaStudio.dec_item_add_content(format_content(lin_id, id_format, 6));
ScanaStudio.dec_item_end();
ScanaStudio.packet_view_add_packet(false, ch_lin, cursor + (samples_per_bit * 1), cursor + (samples_per_bit * 7), "ID",
format_content(lin_id, id_format, 6), ScanaStudio.PacketColors.Preamble.Title,
ScanaStudio.PacketColors.Preamble.Content);
ScanaStudio.packet_view_add_packet(false, ch_lin, cursor + (samples_per_bit * 1), cursor + (samples_per_bit * 7), "Data Length",
get_lin_data_len(lin_id), ScanaStudio.PacketColors.Preamble.Title,
ScanaStudio.PacketColors.Preamble.Content);
ScanaStudio.dec_item_new(ch_lin, cursor + (samples_per_bit * 7), cursor + (samples_per_bit * 9));
ScanaStudio.dec_item_add_content("Parity = " + format_content(lin_par, parity_format, 2));
ScanaStudio.dec_item_add_content("P = " + format_content(lin_par, parity_format, 2));
ScanaStudio.dec_item_add_content(format_content(lin_par, parity_format, 2));
ScanaStudio.dec_item_end();
ScanaStudio.packet_view_add_packet(false, ch_lin, cursor + (samples_per_bit * 7), cursor + (samples_per_bit * 9), "Parity",
format_content(lin_par, parity_format, 2), ScanaStudio.PacketColors.Check.Title,
ScanaStudio.PacketColors.Check.Content);
ScanaStudio.dec_item_new(ch_lin, cursor + (samples_per_bit * 9), cursor + (samples_per_bit * 10));
if (lin_stop == 1)
{
ScanaStudio.dec_item_add_content("STOP");
ScanaStudio.dec_item_add_content("S");
}
else
{
ScanaStudio.dec_item_add_content("! STOP MISSING");
ScanaStudio.dec_item_add_content("! S");
ScanaStudio.dec_item_add_content("!");
ScanaStudio.dec_item_emphasize_error();
ScanaStudio.packet_view_add_packet(false, ch_lin, cursor + (samples_per_bit * 9), cursor + (samples_per_bit * 10),
"Missing Stop", "", ScanaStudio.PacketColors.Error.Title, ScanaStudio.PacketColors.Error.Conent);
}
ScanaStudio.dec_item_end();
n_lin_bytes = get_lin_data_len(lin_id);
byte_counter = 0;
cursor += samples_per_bit * 9.5;
state_machine++;
}
}
else
{
finished = true;
}
break;
case 4: //Reading 1 byte: Wait for start bit
trs = ScanaStudio.trs_get_next(ch_lin);
if ((trs.value == 0) && (trs.sample_index >= cursor)) //found!
{
cursor = trs.sample_index;
ScanaStudio.bit_sampler_init(ch_lin,cursor+(samples_per_bit * 0.5),samples_per_bit);
state_machine++;
//ScanaStudio.console_info_msg("Data "+byte_counter+"/"+n_lin_bytes,cursor);
}
break;
case 5: //Reading 1 byte: gather the bits and ensure it's not a break;
if (ScanaStudio.get_available_samples(ch_lin) > (cursor + (samples_per_bit * 13)))
{
//Get Start bit
lin_start = ScanaStudio.bit_sampler_next(ch_lin);
//get 8 data bits
lin_data = 0;
for (bit_counter = 0; bit_counter < 8; bit_counter++)
{
bit_value = ScanaStudio.bit_sampler_next(ch_lin);
lin_data += Math.pow(2, bit_counter) * bit_value;
}
lin_stop = ScanaStudio.bit_sampler_next(ch_lin);
if (lin_stop == 0)
{
//ScanaStudio.console_info_msg("This is probably a BREAK (during data)...",cursor);
//This is probably a BREAK.
state_machine = 1;
}
else
{
ScanaStudio.dec_item_new(ch_lin, cursor, cursor + samples_per_bit);
if (lin_start == 0)
{
ScanaStudio.dec_item_add_content("START");
ScanaStudio.dec_item_add_content("S");
}
else
{
ScanaStudio.dec_item_add_content("! INVALID START");
ScanaStudio.dec_item_add_content("! S");
ScanaStudio.dec_item_add_content("!");
ScanaStudio.dec_item_emphasize_error();
ScanaStudio.packet_view_add_packet(false, ch_lin, cursor, cursor + samples_per_bit, "Invalid Start", "",
ScanaStudio.PacketColors.Error.Title, ScanaStudio.PacketColors.Error.Content);
}
ScanaStudio.dec_item_end();
if (byte_counter < n_lin_bytes)
{
//ScanaStudio.console_info_msg("push to cheksum: " + lin_data);
chksum_bytes.push(lin_data);
ScanaStudio.dec_item_new(ch_lin, cursor + (samples_per_bit * 1), cursor + (samples_per_bit * 9));
ScanaStudio.dec_item_add_content("DATA("+ byte_counter.toString(10) +") = " + format_content(lin_data, data_format, 8));
ScanaStudio.dec_item_add_content("DATA = " + format_content(lin_data, data_format, 8));
ScanaStudio.dec_item_add_content(format_content(lin_data, data_format, 8));
ScanaStudio.dec_item_end();
ScanaStudio.packet_view_add_packet(false, ch_lin, cursor + (samples_per_bit * 1), cursor + (samples_per_bit * 9), "Data",
format_content(lin_data, data_format, 8), ScanaStudio.PacketColors.Data.Title,
ScanaStudio.PacketColors.Data.Content);
ScanaStudio.hex_view_add_byte(ch_lin, cursor + (samples_per_bit * 1), cursor + (samples_per_bit * 9), lin_data);
}
else
{
var chksum = checksum_calc(chksum_bytes, lin_spec);
ScanaStudio.dec_item_new(ch_lin, cursor + (samples_per_bit * 1), cursor + (samples_per_bit * 9));
if (chksum == lin_data)
{
ScanaStudio.dec_item_add_content("CHECKSUM = " + format_content(lin_data, data_format, 8) + " OK");
ScanaStudio.dec_item_add_content(format_content(lin_data, data_format, 8) + " OK");
ScanaStudio.dec_item_add_content(format_content(lin_data, data_format, 8));
ScanaStudio.packet_view_add_packet(false, ch_lin, cursor + (samples_per_bit * 1), cursor + (samples_per_bit * 9),
"Checksum", format_content(lin_data, data_format, 8) + " OK", ScanaStudio.PacketColors.Check.Title,
ScanaStudio.PacketColors.Check.Content);
}
else
{
ScanaStudio.dec_item_add_content("CHECKSUM = " + format_content(lin_data, data_format, 8) + " INVALID! Should be = " + format_content(chksum, data_format, 8));
ScanaStudio.dec_item_add_content("Err! " + format_content(lin_data, data_format, 8) + " (" + format_content(chksum, data_format, 8) + ")");
ScanaStudio.dec_item_add_content("! " + format_content(lin_data, data_format, 8));
ScanaStudio.dec_item_add_content("!");
ScanaStudio.dec_item_emphasize_error();
ScanaStudio.packet_view_add_packet(false, ch_lin, cursor + (samples_per_bit * 1), cursor + (samples_per_bit * 9),
"Invalid Checksum", format_content(chksum, data_format, 8),
ScanaStudio.PacketColors.Error.Title, ScanaStudio.PacketColors.Error.Content);
}
ScanaStudio.dec_item_end();
}
ScanaStudio.dec_item_new(ch_lin, cursor + (samples_per_bit * 9), cursor + (samples_per_bit * 10));
if (lin_stop == 1)
{
ScanaStudio.dec_item_add_content("STOP");
ScanaStudio.dec_item_add_content("S");
}
else
{
ScanaStudio.dec_item_add_content("! STOP MISSING");
ScanaStudio.dec_item_add_content("! S");
ScanaStudio.dec_item_add_content("!");
ScanaStudio.dec_item_emphasize_error();
ScanaStudio.packet_view_add_packet(false, ch_lin, cursor + (samples_per_bit * 9), cursor + (samples_per_bit * 10), "Missing Stop",
"", ScanaStudio.PacketColors.Error.Title, ScanaStudio.PacketColors.Error.Content);
}
ScanaStudio.dec_item_end();
cursor += samples_per_bit * 9.5;
if (byte_counter < n_lin_bytes)
{
byte_counter++;
state_machine--;
}
else
{
state_machine = 0; //search for next break;
}
}
}
else
{
finished = true;
}
break;
default:
state_machine = 0;
break;
}
}
}
//Function called to generate demo siganls (when no physical device is attached)
function on_build_demo_signals()
{
//Use the function below to get the number of samples to be built
var samples_to_build = ScanaStudio.builder_get_maximum_samples_count();
var silence_period_samples = 1000 + (samples_to_build / 125);
ch_lin = ScanaStudio.gui_get_value("ch_lin");
lin_spec = ScanaStudio.gui_get_value("lin_spec");
var builder = ScanaStudio.BuilderObject;
builder.config(ch_lin,9600,lin_spec);
while (ScanaStudio.builder_get_samples_acc(ch_lin) < samples_to_build)
{
builder.put_silence(silence_period_samples);
var random_id = Math.floor(Math.random()*63);
var len = get_lin_data_len(random_id);
var i;
var data = []
for (i = 0; i<len; i++)
{
data.push(Math.floor(Math.random()*255));
}
builder.put_frame(random_id,data);
}
}
//Builder object that can be shared to other scripts
ScanaStudio.BuilderObject =
{
//to be configured by the user of this object using the setter functions below
ch_lin: 0,
sampling_rate: 1e6,
put_silence : function (samples_count)
{
ScanaStudio.builder_add_samples(this.ch_lin, 1, samples_count);
},
put_frame : function (id, data_bytes)
{
var lin_frame = [];
var i;
lin_frame.push(id | (calc_parity(id) << 6));
this.put_header(id);
for (i = 0; i < data_bytes.length; i++)
{
lin_frame.push(data_bytes[i]);
this.put_byte(data_bytes[i]);
}
this.put_byte(checksum_calc(lin_frame, this.spec));
},
put_header : function (id)
{
var parity;
//13 break bits
ScanaStudio.builder_add_samples(this.ch_lin, 0, 13 * this.samples_per_bit);
ScanaStudio.builder_add_samples(this.ch_lin, 1, 4 * this.samples_per_bit);
this.put_byte(0x55);
//Put ID field
//Start bit
ScanaStudio.builder_add_samples(this.ch_lin, 0, this.samples_per_bit);
for (i = 0; i < 6; i++)
{
b = ((id >> i) & 0x1)
ScanaStudio.builder_add_samples(this.ch_lin, b, this.samples_per_bit);
}
//Put parity bits
parity = calc_parity(id);
for (i = 0; i < 2; i++)
{
b = ((parity >> i) & 0x1)
ScanaStudio.builder_add_samples(this.ch_lin, b, this.samples_per_bit);
}
//Stop bit
ScanaStudio.builder_add_samples(this.ch_lin,1,this.samples_per_bit);
},
put_byte : function (byte)
{
var i, b;
//Start bit
ScanaStudio.builder_add_samples(this.ch_lin, 0, this.samples_per_bit);
for (i = 0; i < 8; i++)
{
b = ((byte >> i) & 0x1)
ScanaStudio.builder_add_samples(this.ch_lin, b, this.samples_per_bit);
}
//Stop bit
ScanaStudio.builder_add_samples(this.ch_lin,1,this.samples_per_bit);
},
config : function (ch, baud, spec)
{
this.ch_lin = ch;
this.spec = spec;
this.samples_per_bit = Math.floor(ScanaStudio.builder_get_sample_rate() / baud);
}
};
//Helper functions below
/* Get the checksum of all data bytes (array should include PID byte)
*/
/*
Spec: 0 for lin 1.x, 1 for lin 2.x
Test pattern: 0x3C 0xBB 0XE9 should return 0x1E.
*/
function checksum_calc (lin_cheksumed_bytes, spec)
{
var i;
var chksum = 0;
for (i = 0; i < lin_cheksumed_bytes.length; i++)
{
if ((i == 0) && (spec > 0))
{
var id = (lin_cheksumed_bytes[0] & ID_FIELD_MASK.ID);
// Config frame identifiers shall always use classic checksum w/o id field
if ((id != FRAME_ID.CONFIG_0) && (id != FRAME_ID.CONFIG_1))
{
//ScanaStudio.console_info_msg("cheksumming ID byte");
chksum += lin_cheksumed_bytes[i];
//ScanaStudio.console_info_msg("chksum calc step("+ i +"), data= 0x"+lin_cheksumed_bytes[i].toString(16));
}
else
{
//ScanaStudio.console_info_msg("ignoring ID byte from cheksum");
}
}
else if (i > 0)
{
//ScanaStudio.console_info_msg("chksum calc step("+ i +"), data= 0x"+lin_cheksumed_bytes[i].toString(16));
chksum += lin_cheksumed_bytes[i];
}
if (chksum >= 256) chksum -= 255;
//ScanaStudio.console_info_msg("SUM = 0x"+chksum.toString(16));
}
//ScanaStudio.console_info_msg("chksum before invert="+chksum);
return (~chksum) & 0xFF;
}
function calc_parity (id)
{
var id0 = (id & 0x01) ? 1 : 0;
var id1 = (id & 0x02) ? 1 : 0;
var id2 = (id & 0x04) ? 1 : 0;
var id3 = (id & 0x08) ? 1 : 0;
var id4 = (id & 0x10) ? 1 : 0;
var id5 = (id & 0x20) ? 1 : 0;
var p0Calc = (id0 ^ id1 ^ id2 ^ id4); // XOR of bits ID0, ID1, ID2 and ID4
var p1Calc = !(id1 ^ id3 ^ id4 ^ id5); // NOT of XOR of bits ID1, ID3, ID4 and ID5
//ScanaStudio.console_info_msg("PArity for " + id + " = " + p0Calc + ":" + p1Calc);
return (p0Calc | (p1Calc << 1));
}
/* Verify parity of frame identifier bits
*/
function check_parity (id)
{
var id0 = (id & 0x01) ? 1 : 0;
var id1 = (id & 0x02) ? 1 : 0;
var id2 = (id & 0x04) ? 1 : 0;
var id3 = (id & 0x08) ? 1 : 0;
var id4 = (id & 0x10) ? 1 : 0;
var id5 = (id & 0x20) ? 1 : 0;
var p0 = (id & ID_FIELD_MASK.PARITY_0) ? 1 : 0;
var p1 = (id & ID_FIELD_MASK.PARITY_1) ? 1 : 0;
var p0Calc = (id0 ^ id1 ^ id2 ^ id4); // XOR of bits ID0, ID1, ID2 and ID4
var p1Calc = !(id1 ^ id3 ^ id4 ^ id5); // NOT of XOR of bits ID1, ID3, ID4 and ID5
if ((p0 == p0Calc) && (p1 == p1Calc))
{
return true;
}
return false;
}
function get_lin_data_len (id)
{
if (lin_spec == 0)
{
return 8;
}
else if (id < 0x20)
{
return 2;
}
else if (id < 0x30)
{
return 4;
}
else
{
return 8;
}
}
/*
Helper function to convert data to formated text
according to formating options set by the user
*/
function format_content (data, data_format, size_bits)
{
switch (data_format)
{
case 0: //HEX
return "0x" + pad(data.toString(16), Math.ceil(size_bits / 4));
break;
case 1: //Binary
return to_binary_str(data, size_bits);
break;
case 2: // Dec
return data.toString(10);
break;
case 3: //ASCII
return " '" + String.fromCharCode(data) + "'"
break;
default: break;
}
}
/* Helper fonction to convert value to binary, including 0-padding
and groupping by 4-bits packets
*/
function to_binary_str (value, size)
{
var i;
var str = pad(value.toString(2), size);
var ret = "";
for (i = 0; i < str.length; i+= 4)
{
ret += str.slice(i,(i+4)) + " ";
}
ret = "0b" + ret + str.slice(i);
return ret;
}
/* A helper function add leading "0"s to numbers
Parameters
* num_str: A string of the number to be be 0-padded
* size: The total wanted size of the output string
*/
function pad (num_str, size)
{
while (num_str.length < size) num_str = "0" + num_str;
return num_str;
}