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can.js
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/* Protocol meta info:
<NAME> CAN Bus </NAME>
<DESCRIPTION>
CAN bus protocol analyzer
</DESCRIPTION>
<VERSION> 1.0 </VERSION>
<AUTHOR_NAME> Ibrahim KAMAL, Nicolas Bastit </AUTHOR_NAME>
<AUTHOR_URL> i.kamal@ikalogic.com, n.bastit@ikalogic.com </AUTHOR_URL>
<HELP_URL> https://github.com/ikalogic/ScanaStudio-scripts-v3/wiki </HELP_URL>
<COPYRIGHT> Copyright Ibrahim KAMAL </COPYRIGHT>
<LICENSE> This code is distributed under the terms of the GNU General Public License GPLv3 </LICENSE>
<RELEASE_NOTES>
v1.0: Added support for CAN-FD ISO CRC (ISO 11898-1:2015)
v0.991: Fix bug in trigger: doesn't trig on the first frame
v0.99: Fix bug in trigger.
v0.98: Fix bug in trigger on CAN data bytes 0x00.
v0.97: Fix bug in trigger on CAN Data bytes.
v0.96: Added option to trigger on CAN Data bytes.
v0.95: Added trigger capability for normal and extended ID.
v0.9: Fix bug that caused error in decoding live streamed samples, fixed bug related to bit stuffing of CRC delimiter.
v0.8: Fix bug that caused bit stuffing in CRC field to be ignored.
v0.7: Fix bug that caused CAN FD frame with 0 data to have a wrong CRC.
v0.6: Fix several bugs related to bit stuffing errors.
V0.5: Added packet view
V0.3: Added dec_item_end() for each dec_item_new()
V0.2: Added error detection, added GUI validation, fixed bit stuffing errors
V0.1: Initial release
</RELEASE_NOTES>
*/
/*
// TODO in future releases
// documentation
// Add trigger support
*/
//Decoder GUI
function on_draw_gui_decoder()
{
//Define decoder configuration GUI
ScanaStudio.gui_add_ch_selector("ch","CAN Channel","CAN");
ScanaStudio.gui_add_engineering_form_input_box("rate","Bit rate",100,1e6,125e3,"Bit/s");
ScanaStudio.gui_add_new_tab("CAN FD options",false);
ScanaStudio.gui_add_engineering_form_input_box("rate_fd","CAN-FD bit rate",100,20e6,2e6,"Bit/s");
ScanaStudio.gui_add_check_box("can_fd_iso","ISO CRC (ISO 11898-1:2015)",false);
ScanaStudio.gui_add_info_label("If you're not using CAN-FD, you can just ignore these settings.");
ScanaStudio.gui_end_tab();
ScanaStudio.gui_add_new_tab("Display options",false);
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("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_add_combo_box("crc_format","CRC 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()
{
sampling_rate = ScanaStudio.get_capture_sample_rate();
var max_rate = sampling_rate/8; //We need at least that much points per bit period for correct decoding
rate = ScanaStudio.gui_get_value("rate");
rate_fd = ScanaStudio.gui_get_value("rate_fd");
if (rate > max_rate)
{
return ("Selected bit rate of " + ScanaStudio.engineering_notation(rate,5) + "Hz"
+ " is too high compared to device sampling rate of " + ScanaStudio.engineering_notation(sampling_rate,5) + "Hz\n"
+ "(Maximum allowable bit rate is " + ScanaStudio.engineering_notation(max_rate,5) + "Hz"
);
}
if (rate_fd > max_rate)
{
return ("Selected FD bit rate of " + ScanaStudio.engineering_notation(rate_fd,5) + "Hz"
+ " is too high compared to device sampling rate of " + ScanaStudio.engineering_notation(sampling_rate,5) + "Hz\n"
+ "(Maximum allowable bit rate is " + ScanaStudio.engineering_notation(max_rate,5) + "Hz"
);
}
return "" //All good.
}
//Global variables
var sampling_rate;
var cursor,prev_cursor;
var state_machine;
var ch,rate,rate_fd;
var can_fd_iso;
var margin,margin_fd;
var stuff_mode = 0; //0: off, 1: std bit stuffing, 2: FD CRC bit stuffing
var samples_per_bit,samples_per_bit_std,samples_per_bit_fd,sample_point_offset;
var sample_point_offset_std,sample_point_offset_fd;
var fd_mode = false;
var bit_to_process,current_bit_value,dominant_bits_counter,same_bit_value_counter;
var switch_to_high_baud_rate = false;
var switch_to_std_baud_rate = false;
var crc_len = 15;
var can_fd_sbc_len = 4;
var dec_item_margin = 1;
var exit_while = false;
/*
Bit flow through the decoder:
[Samples]---->[bits]--┯----->[destuff]-------┯---->[process bits]
| |
└----->[CRC_FD calc] └---->[CRC_STD calc]
*/
function on_decode_signals(resume)
{
var is_stuffed_bit;
var start_sample, end_sample;
exit_while = false;
if (!resume) //If resume == false, it's the first call to this function.
{
//initialization code goes here, ex:
state_machine = 0;
can_state_machine = CAN.SEEK_SOF;
cursor = 1;
sampling_rate = ScanaStudio.get_capture_sample_rate();
ch = ScanaStudio.gui_get_value("ch");
rate = ScanaStudio.gui_get_value("rate");
rate_fd = ScanaStudio.gui_get_value("rate_fd");
id_format = ScanaStudio.gui_get_value("id_format");
data_format = ScanaStudio.gui_get_value("data_format");
crc_format = ScanaStudio.gui_get_value("crc_format");
can_fd_iso = ScanaStudio.gui_get_value("can_fd_iso");
samples_per_bit_std = Math.floor(sampling_rate / rate);
//Pinpoint exact sampling point (CAN Spec page 28)
sample_point_offset_std = Math.floor(samples_per_bit_std *11 / 15);
samples_per_bit_fd = Math.floor(sampling_rate / rate_fd);
samples_per_brs_bit = (samples_per_bit_std*11/15) + (samples_per_bit_fd*4/10);
samples_per_fd_crc_del_bit = (samples_per_bit_fd*6/10) + (samples_per_bit_std*4/15);
sample_point_offset_fd = Math.floor(samples_per_bit_fd *6 / 10);
margin = Math.floor(samples_per_bit_std / 20) + 1;
margin_fd = Math.floor(samples_per_bit_std / 20) + 1;
fd_mode = false;
stuff_mode = 1;
current_bit_value = 0;
dominant_bits_counter = 1;
bit_to_process = 0;
same_bit_value_counter = 0;
crc_reset();
ScanaStudio.trs_reset(ch);
}
while (ScanaStudio.abort_is_requested() == false)
{
if (!ScanaStudio.trs_is_not_last(ch))
{
break;
}
switch (state_machine)
{
case 0: //Search for next transition and sync to it.
trs = ScanaStudio.trs_get_next(ch);
if (trs.sample_index >= cursor)
{
cursor = trs.sample_index;
if (fd_mode) //Flexible datarate CAN
{
samples_per_bit = samples_per_bit_fd;
sample_point_offset = sample_point_offset_fd;
ScanaStudio.bit_sampler_init(ch,cursor+sample_point_offset_fd,samples_per_bit);
cursor += sample_point_offset_fd;
}
else //standard CAN
{
samples_per_bit = samples_per_bit_std;
sample_point_offset = sample_point_offset_std;
ScanaStudio.bit_sampler_init(ch,cursor+sample_point_offset_std,samples_per_bit);
cursor += sample_point_offset_std;
}
dec_item_margin = samples_per_bit / 8;
current_bit_value = trs.value;
prev_cursor = cursor;
dominant_bits_counter = 0;
same_bit_value_counter = 0;
state_machine++;
}
break;
case 1: //process bits until there is a change
if (ScanaStudio.get_available_samples(ch) > (cursor + (samples_per_bit*2)))
{
bit_to_process = ScanaStudio.bit_sampler_next(ch)
same_bit_value_counter++;
if ((same_bit_value_counter > 6) && (can_state_machine < CAN.SEEK_CRC))
{
same_bit_value_counter = 0;
cursor = prev_cursor;
state_machine = 0;
fd_mode = false;
switch_to_high_baud_rate = false;
switch_to_std_baud_rate = false;
if (bit_to_process == 1)
{
can_state_machine = CAN.SEEK_SOF;
}
else
{
can_state_machine = CAN.SEEK_IDLE;
}
break;
}
if (can_state_machine == CAN.SEEK_IDLE)
{
stuffing_reset();
stuff_mode = 1; //By default, normal stuffing
}
if (bit_to_process == current_bit_value)
{
is_stuffed_bit = false;
if (stuff_mode == 1)
{
if (stuffing_check(bit_to_process) >= 0)
{
is_stuffed_bit = true;
}
}
else if (stuff_mode == 2)
{
if (stuffing_check_fd_crc(bit_to_process) >= 0)
{
is_stuffed_bit = true;
}
}
can_process_bit(bit_to_process,cursor,is_stuffed_bit);
prev_cursor = cursor;
if (switch_to_high_baud_rate && (is_stuffed_bit == false))
{
//scanastudio.console_info_msg("Switching to high baud rate here! new spb="+samples_per_bit_fd + ", was " + samples_per_bit_std,cursor);
switch_to_high_baud_rate = false;
ScanaStudio.bit_sampler_init(ch,cursor+samples_per_bit_fd,samples_per_bit_fd);
cursor += samples_per_bit_fd;
//scanastudio.console_info_msg("new cursor pos = " + cursor,cursor);
samples_per_bit = samples_per_bit_fd;
fd_mode = true;
}
else if (switch_to_std_baud_rate && (is_stuffed_bit == false))
{
//scanastudio.console_info_msg("Switching to standard baud rate here!",cursor);
switch_to_std_baud_rate = false;
ScanaStudio.bit_sampler_init(ch,cursor+samples_per_bit_std,samples_per_bit_std);
cursor += samples_per_bit_std;
//scanastudio.console_info_msg("new cursor pos = " + cursor,cursor);
samples_per_bit = samples_per_bit_std;
fd_mode = false;
}
else
{
cursor += samples_per_bit;
}
}
else //CAN line level changed, resync!
{
cursor = prev_cursor;
//ScanaStudio.console_info_msg("bit change at" + cursor,cursor);
state_machine = 0;
}
}
else
{
exit_while = true;
}
break;
default:
state_machine = 0;
}
if (exit_while)
{
break;
}
}
}
var CAN =
{
SEEK_IDLE : 0,
SEEK_SOF : 10,
SEEK_BASE_ID : 20,
SEEK_FD_R0_BRS : 30,
SEEK_CAN_DLC : 40,
SEEK_FD_ESI_DLC : 50,
SEEK_IDE : 70,
SEEK_DATA : 80,
SEEK_STUFF_CNT : 85,
SEEK_CRC : 90,
SEEK_CRC_DEL : 100,
SEEK_ACK : 110,
};
//Trigger sequence GUI
function on_draw_gui_trigger()
{
ScanaStudio.gui_add_info_label("Trigger on specific CAN ID (or first bits of that ID). Type hex values (e.g. 0xAB1122) or decimal value (e.g. 11211042)");
ScanaStudio.gui_add_new_selectable_containers_group("trg_alt","CAN ID Field length");
ScanaStudio.gui_add_new_container("Standard 11-bits ID",true);
ScanaStudio.gui_add_text_input("can_id_trig_std","CAN ID","0x123");
ScanaStudio.gui_end_container();
ScanaStudio.gui_add_new_container("Extended 29-bits ID",false);
ScanaStudio.gui_add_text_input("can_id_trig_ext","CAN ID","0x11223344");
ScanaStudio.gui_end_container();
ScanaStudio.gui_end_selectable_containers_group();
ScanaStudio.gui_add_new_tab("Data bytes", false);
ScanaStudio.gui_add_info_label("Data bytes are optionnal and not aviable for CAN FD. Leave it empty if you don't wish to trigger on specific data bytes. Bytes must be written in the same order as they will appear on the CAN frame. You can either type in hexadecimal, decimal, or a mix of both. byte should be separated by a comma, e.g.: 0xA1,0xA2,0xA3");
ScanaStudio.gui_add_text_input("can_trig_data","Data bytes","");
ScanaStudio.gui_end_tab();
}
//Evaluate trigger GUI
function on_eval_gui_trigger()
{
var can_id_trig_std = ScanaStudio.gui_get_value("can_id_trig_std");
var can_id_trig_ext = ScanaStudio.gui_get_value("can_id_trig_ext");
var trg_alt = ScanaStudio.gui_get_value("trg_alt");
if (trg_alt == 0)
{
if(isNaN(can_id_trig_std))
{
return "Invalid CAN ID (not a number)";
}
else if(can_id_trig_std > 0x7FF)
{
return "Invalid CAN ID (more than 11 bits)";
}
}
if (trg_alt == 1)
{
if(isNaN(can_id_trig_ext))
{
return "Invalid CAN ID (not a number)";
}
else if(can_id_trig_ext > 0x1FFFFFFF)
{
return "Invalid CAN ID (more than 29 bits)";
}
}
return ""; //All good.
}
//Build trigger sequence
function on_build_trigger()
{
var trg = TriggerObject;
var can_id_trig_std = ScanaStudio.gui_get_value("can_id_trig_std");
var can_id_trig_ext = ScanaStudio.gui_get_value("can_id_trig_ext");
var trg_alt = ScanaStudio.gui_get_value("trg_alt");
var data_string = ScanaStudio.gui_get_value("can_trig_data");
var data_array = data_string.split(',');
var number_array = []
trg.configure(ScanaStudio.gui_get_value("ch"),
ScanaStudio.gui_get_value("rate"),
ScanaStudio.get_capture_sample_rate());
var tmp;
for (i = 0; i < data_array.length; i++)
{
tmp = Number(data_array[i].trim());
if(!isNaN(tmp) && (data_string.length != 0))
{
number_array.push(tmp);
}
}
if (trg_alt == 0) //STD, 11 bits ID
{
trg.build_trg_std(can_id_trig_std, number_array);
}
else
{
trg.build_trg_ext(can_id_trig_ext, number_array);
}
}
TriggerObject = {
build_trg_std : function(id,data_array)
{
stuffing_reset();
this.put_trig_wait_start();
this.put_word(id,11);
if (data_array.length > 0)
{
this.put_bit(0); //RTR
this.put_bit(0); //IDE = 0
this.put_bit(0); //R0 //Always 0 for CAN frame (1 for CAN FD frames)
this.put_word(data_array.length,4);
for (i = 0; i < data_array.length; i++)
{
this.put_word(data_array[i],8);
}
}
this.put_trig_end();
},
build_trg_ext : function(id,data_array)
{
stuffing_reset();
this.put_trig_wait_start();
this.put_word((id >> 18),11);
this.put_bit(1); //SRR
this.put_bit(1); //IDE = 1
this.put_word((id) & 0x3FFFF,18);
if (data_array.length > 0)
{
this.put_bit(0); //RTR
this.put_bit(0); //R1
this.put_bit(0); //R0 //Always 0 for CAN frame (1 for CAN FD frames)
this.put_word(data_array.length,4);
for (i = 0; i < data_array.length; i++)
{
this.put_word(data_array[i],8);
}
}
this.put_trig_end();
},
put_word : function(words,len)
{
var i;
for (i = (len-1); i >= 0; i--)
{
//ScanaStudio.console_info_msg("put_word:"+((words >> i) & 0x1));
this.put_bit((words >> i) & 0x1);
}
},
put_bit : function(b)
{
var sb = -1; //assume there is not bit stuffing
sb = stuffing_build(b);
if (sb >= 0) //add stuffed bit if needed
{
this.put_trig_step(sb);
}
this.put_trig_step(b);
},
put_trig_wait_start : function()
{
var step_idle = "";
var i;
for (i = 0; i < ScanaStudio.get_device_channels_count(); i++)
{
if (i == this.channel)
{
step_idle = "F" + step_idle;
}
else
{
step_idle = "X" + step_idle;
}
}
ScanaStudio.flexitrig_append(step_idle,-1,-1);
this.last_level = 0;
this.bits_count = 1;
},
put_trig_step : function(b)
{
var step = "";
var i;
var step_ch_desc;
if (b == this.last_level)
{
this.bits_count++;
return;
}
if (b == 0)
{
step_ch_desc = "F";
}
else
{
step_ch_desc = "R";
}
for (i = 0; i < ScanaStudio.get_device_channels_count(); i++)
{
if (i == this.channel)
{
step = step_ch_desc + step;
}
else
{
step = "X" + step;
}
}
if (this.bits_count > 6) //in case of the start bit, no t_max constraint
{
//15% slack
ScanaStudio.flexitrig_append(step,this.bits_count * this.bit_period * 0.85,-1);
}
else
{
//15% slack
ScanaStudio.flexitrig_append(step,this.bits_count * this.bit_period * 0.85,this.bits_count * this.bit_period * 1.15);
}
this.last_level = b;
this.bits_count = 1;
},
/*
put_trig_end is used to add the very final trigger
step, which is different than intermediary steps.
The final step has only a "t_min" constrain,
*/
put_trig_end : function()
{
var step_next = "";
var i;
var step
if (this.last_level == 1)
{
step = "F";
}
else
{
step = "R";
}
for (i = 0; i < ScanaStudio.get_device_channels_count(); i++)
{
if (i == this.channel)
{
step_next = step + step_next;
}
else
{
step_next = "X" + step_next;
}
}
ScanaStudio.flexitrig_append(step_next,this.bits_count * this.bit_period * 0.85,-1);
},
configure : function(channel,bitrate_std,sample_rate)
{
this.channel = channel;
this.last_level;
this.bits_count;
this.bit_period = 1/bitrate_std;
}
};
var can_state_machine = CAN.SEEK_IDLE;
var can_destuffed_bit_counter = 0; //count real bit (discarding stuffed bits)
var can_bits = [];
var can_byte_counter;
var can_base_id;
var is_can_fd_frame;
var is_fd_mode;
var last_packet_boudry; //TODO
var last_processed_bit;
function can_process_bit(b,sample_point,is_stuffed_bit)
{
var i;
if (can_state_machine == CAN.SEEK_SOF)
{
is_stuffed_bit = false; //SOF can never be a stuffed bit.
}
if (is_stuffed_bit && (last_processed_bit == b)) //Bit stuffing error!
{
start_sample = sample_point + dec_item_margin;
end_sample = sample_point + samples_per_bit_std - dec_item_margin;
ScanaStudio.dec_item_new( ch, start_sample,end_sample);
ScanaStudio.dec_item_add_content("Stuffing error");
ScanaStudio.dec_item_add_content("Error");
ScanaStudio.dec_item_add_content("!E");
ScanaStudio.dec_item_emphasize_error();
ScanaStudio.dec_item_end();
ScanaStudio.packet_view_add_packet(true, ch, start_sample, end_sample, "Error", "Stuffing error", ScanaStudio.PacketColors.Error.Title, ScanaStudio.PacketColors.Error.Content);
can_state_machine = CAN.SEEK_IDLE;
}
last_processed_bit = b;
crc_acc(b,is_stuffed_bit);
if (is_stuffed_bit)
{
can_bits.push([sample_point,"X",b]);
//scanastudio.console_info_msg("+1 stuffed bit at " + sample_point,sample_point);
return;
}
can_bits.push([sample_point,"U",b]);
//ScanaStudio.console_info_msg( b +" bit",sample_point);
switch (can_state_machine) {
case CAN.SEEK_IDLE:
if (b == 1)
{
can_state_machine = CAN.SEEK_SOF;
}
break;
case CAN.SEEK_SOF: //Seek SOF
if (b == 0)
{
stuff_mode = 1;
stuffing_reset();
stuffing_check(0);
crc_reset();
crc_acc(0,false);
//Add start bit item
start_sample = sample_point - sample_point_offset_std + dec_item_margin;
end_sample = sample_point - sample_point_offset_std + samples_per_bit_std - dec_item_margin;
ScanaStudio.dec_item_new( ch, start_sample, end_sample);
ScanaStudio.dec_item_add_content("Start Of Frame");
ScanaStudio.dec_item_add_content("SOF");
ScanaStudio.dec_item_add_content("S");
ScanaStudio.dec_item_add_sample_point(sample_point,"U");
ScanaStudio.dec_item_end();
ScanaStudio.packet_view_add_packet(true, ch, start_sample, -1, "CAN", "CH" + (ch + 1),
ScanaStudio.get_channel_color(ch), ScanaStudio.get_channel_color(ch));
ScanaStudio.packet_view_add_packet(false, ch, start_sample, end_sample, "SOF", "", ScanaStudio.PacketColors.Wrap.Title, ScanaStudio.PacketColors.Wrap.Content);
can_bits = [];
fd_mode = false;
switch_to_high_baud_rate = false;
switch_to_std_baud_rate = false;
can_state_machine = CAN.SEEK_BASE_ID;
is_can_fd_frame = false;
is_fd_mode = false;
crc_len = 15;
can_destuffed_bit_counter = 0;
}
break;
case CAN.SEEK_BASE_ID: //and also R1, IDE and R0
can_destuffed_bit_counter++;
if (can_destuffed_bit_counter == 14)
{
can_destuffed_bit_counter = 0;
can_base_id = interpret_can_bits(can_bits,0,11);
can_rtr_r1 = interpret_can_bits(can_bits,11,1);
can_ide = interpret_can_bits(can_bits,12,1);
can_r0 = interpret_can_bits(can_bits,13,1);
//Base ID field
start_sample = can_base_id.start - sample_point_offset_std + dec_item_margin;
end_sample = can_base_id.end - sample_point_offset_std + samples_per_bit_std - dec_item_margin;
ScanaStudio.dec_item_new( ch, start_sample, end_sample);
ScanaStudio.dec_item_add_content("Base ID = " + format_content(can_base_id.value,id_format,11));
ScanaStudio.dec_item_add_content(format_content(can_base_id.value,id_format,11));
add_can_bits_sampling_points(can_bits,0,11);
ScanaStudio.dec_item_end();
ScanaStudio.packet_view_add_packet(false, ch, start_sample, end_sample, "Base ID", format_content(can_base_id.value,id_format,11),
ScanaStudio.PacketColors.Head.Title, ScanaStudio.PacketColors.Head.Content);
//RTR / R1 field
start_sample = can_rtr_r1.start - sample_point_offset_std + dec_item_margin;
end_sample = can_rtr_r1.end - sample_point_offset_std + samples_per_bit_std - dec_item_margin;
ScanaStudio.dec_item_new( ch, start_sample, end_sample);
add_can_bits_sampling_points(can_bits,11,1);
if (can_ide.value == 0)
{
if (can_r0.value == 0)
{
ScanaStudio.dec_item_add_content("RTR");
ScanaStudio.packet_view_add_packet(false, ch, start_sample, end_sample, "RTR", "",
ScanaStudio.PacketColors.Preamble.Title, ScanaStudio.PacketColors.Preamble.Content);
can_state_machine = CAN.SEEK_CAN_DLC;
}
else
{
is_can_fd_frame = true;
ScanaStudio.dec_item_add_content("R1");
ScanaStudio.packet_view_add_packet(false, ch, start_sample, end_sample, "R1", "",
ScanaStudio.PacketColors.Preamble.Title, ScanaStudio.PacketColors.Preamble.Content);
can_state_machine = CAN.SEEK_FD_R0_BRS;
}
}
else
{
ScanaStudio.dec_item_add_content("SRR");
ScanaStudio.packet_view_add_packet(false, ch, start_sample, end_sample, "SRR", "",
ScanaStudio.PacketColors.Preamble.Title, ScanaStudio.PacketColors.Preamble.Content);
can_state_machine = CAN.SEEK_IDE;
}
ScanaStudio.dec_item_end();
//IDE Field
start_sample = can_ide.start - sample_point_offset_std + dec_item_margin;
end_sample = can_ide.end - sample_point_offset_std + samples_per_bit_std - dec_item_margin;
ScanaStudio.dec_item_new( ch, start_sample, end_sample);
add_can_bits_sampling_points(can_bits,12,1);
ScanaStudio.dec_item_add_content("IDE = " + can_ide.value.toString());
ScanaStudio.dec_item_add_content("IDE");
ScanaStudio.dec_item_end();
ScanaStudio.packet_view_add_packet(false, ch, start_sample, end_sample, "IDE", can_ide.value.toString(),
ScanaStudio.PacketColors.Preamble.Title, ScanaStudio.PacketColors.Preamble.Content);
//R0 - EDL (if not IDE)
if (can_state_machine != CAN.SEEK_IDE)
{
start_sample = can_r0.start - sample_point_offset_std + dec_item_margin;
end_sample = can_r0.end - sample_point_offset_std + samples_per_bit_std - dec_item_margin;
ScanaStudio.dec_item_new( ch, start_sample, end_sample);
if (can_r0.value == 0)
{
ScanaStudio.dec_item_add_content("R0 = " + can_r0.value.toString());
ScanaStudio.dec_item_add_content("R0");
ScanaStudio.packet_view_add_packet(false, ch, start_sample, end_sample, "R0", can_r0.value.toString(),
ScanaStudio.PacketColors.Preamble.Title, ScanaStudio.PacketColors.Preamble.Content);
}
else
{
ScanaStudio.dec_item_add_content("EDL = " + can_r0.value.toString());
ScanaStudio.dec_item_add_content("EDL");
ScanaStudio.packet_view_add_packet(false, ch, start_sample, end_sample, "EDL", can_r0.value.toString(),
ScanaStudio.PacketColors.Preamble.Title, ScanaStudio.PacketColors.Preamble.Content);
}
add_can_bits_sampling_points(can_bits,13,1);
ScanaStudio.dec_item_end();
can_bits = [];
}
else //It's a IDE frame, RO/EDL need to be counted in the IDE
{
can_destuffed_bit_counter = 1;
can_bits = can_bits.slice(can_bits.length-1);
}
}
break;
case CAN.SEEK_IDE:
can_destuffed_bit_counter++;
if (can_destuffed_bit_counter == 21)
{
can_id_ext = interpret_can_bits(can_bits,0,18);
can_full_id = (can_base_id.value << 18) | can_id_ext.value;
can_rtr_r1 = interpret_can_bits(can_bits,18,1);
can_r1_edl = interpret_can_bits(can_bits,19,1);
can_r0 = interpret_can_bits(can_bits,20,1);
//Base ID field
start_sample = can_id_ext.start - sample_point_offset_std + dec_item_margin;
end_sample = can_id_ext.end - sample_point_offset_std + samples_per_bit_std - dec_item_margin;
ScanaStudio.dec_item_new( ch, start_sample, end_sample);
ScanaStudio.dec_item_add_content("Full Extended ID = "+ format_content(can_full_id,id_format,29) + " (" + format_content(can_base_id.value,id_format,11) + " + " + format_content(can_id_ext.value,id_format,18) + ")");
ScanaStudio.dec_item_add_content("Full ID " + format_content(can_full_id,id_format,29));
ScanaStudio.dec_item_add_content(format_content(can_full_id,id_format,29));
ScanaStudio.dec_item_add_content("ID Ext.");
add_can_bits_sampling_points(can_bits,0,18);
ScanaStudio.dec_item_end();
ScanaStudio.packet_view_add_packet(false, ch, start_sample, end_sample, "Full ID", format_content(can_full_id,id_format,29),
ScanaStudio.PacketColors.Head.Title, ScanaStudio.PacketColors.Head.Content);
if (can_r1_edl.value == 0) //CAN Frame
{
//RTR
start_sample = can_rtr_r1.start - sample_point_offset_std + dec_item_margin;
end_sample = can_rtr_r1.end - sample_point_offset_std + samples_per_bit_std - dec_item_margin;
ScanaStudio.dec_item_new( ch, start_sample, end_sample);
add_can_bits_sampling_points(can_bits,18,1);
ScanaStudio.dec_item_add_content("RTR = " + can_rtr_r1.value.toString());
ScanaStudio.dec_item_add_content("RTR");
ScanaStudio.dec_item_end();
ScanaStudio.packet_view_add_packet(false, ch, start_sample, end_sample, "RTR", can_rtr_r1.value.toString(),
ScanaStudio.PacketColors.Preamble.Title, ScanaStudio.PacketColors.Preamble.Content);
//R1
start_sample = can_r1_edl.start - sample_point_offset_std + dec_item_margin;
end_sample = can_r1_edl.end - sample_point_offset_std + samples_per_bit_std - dec_item_margin;
ScanaStudio.dec_item_new( ch, start_sample, end_sample);
add_can_bits_sampling_points(can_bits,19,1);
ScanaStudio.dec_item_add_content("R1 = " + can_r1_edl.value.toString());
ScanaStudio.dec_item_add_content("R1");
ScanaStudio.dec_item_end();
ScanaStudio.packet_view_add_packet(false, ch, start_sample, end_sample, "R1", can_r1_edl.value.toString(),
ScanaStudio.PacketColors.Preamble.Title, ScanaStudio.PacketColors.Preamble.Content);
}
else //CAN FD frame
{
is_can_fd_frame = true;
//R1
start_sample = can_rtr_r1.start - sample_point_offset_std + dec_item_margin;
end_sample = can_rtr_r1.end - sample_point_offset_std + samples_per_bit_std - dec_item_margin;
ScanaStudio.dec_item_new( ch, start_sample, end_sample);
add_can_bits_sampling_points(can_bits,18,1);
ScanaStudio.dec_item_add_content("R1 = " + can_rtr_r1.value.toString());
ScanaStudio.dec_item_add_content("R1");
ScanaStudio.dec_item_end();
ScanaStudio.packet_view_add_packet(false, ch, start_sample, end_sample, "R1", can_rtr_r1.value.toString(),
ScanaStudio.PacketColors.Preamble.Title, ScanaStudio.PacketColors.Preamble.Content);
//EDL
start_sample = can_r1_edl.start - sample_point_offset_std + dec_item_margin;
end_sample = can_r1_edl.end - sample_point_offset_std + samples_per_bit_std - dec_item_margin;
ScanaStudio.dec_item_new( ch, start_sample, end_sample);
add_can_bits_sampling_points(can_bits,19,1);
ScanaStudio.dec_item_add_content("EDL = " + can_r1_edl.value.toString());
ScanaStudio.dec_item_add_content("EDL");
ScanaStudio.dec_item_end();
ScanaStudio.packet_view_add_packet(false, ch, start_sample, end_sample, "EDL", can_r1_edl.value.toString(),
ScanaStudio.PacketColors.Preamble.Title, ScanaStudio.PacketColors.Preamble.Content);
}
if (is_can_fd_frame)
{
can_state_machine = CAN.SEEK_FD_R0_BRS;
can_destuffed_bit_counter = 1;
can_bits = can_bits.slice(can_bits.length-1);
}
else
{
//R0
start_sample = can_r0.start - sample_point_offset_std + dec_item_margin;
end_sample = can_r0.end - sample_point_offset_std + samples_per_bit_std - dec_item_margin;
ScanaStudio.dec_item_new( ch, start_sample, end_sample);
add_can_bits_sampling_points(can_bits,20,1);
ScanaStudio.dec_item_add_content("R0 = " + can_r0.value.toString());
ScanaStudio.dec_item_add_content("R0");
ScanaStudio.dec_item_end();
ScanaStudio.packet_view_add_packet(false, ch, start_sample, end_sample, "R0", can_r0.value.toString(),
ScanaStudio.PacketColors.Preamble.Title, ScanaStudio.PacketColors.Preamble.Content);
can_state_machine = CAN.SEEK_CAN_DLC;
can_destuffed_bit_counter = 0;
can_bits = [];
}
}
break;
case CAN.SEEK_CAN_DLC:
can_destuffed_bit_counter++;
if (can_destuffed_bit_counter == 4)
{
can_destuffed_bit_counter = 0;
can_dlc = interpret_can_bits(can_bits,0,4);
can_len = can_dlc.value;
if (can_len > 8) can_len = 8;
start_sample = can_dlc.start - sample_point_offset_std + dec_item_margin;
end_sample = can_dlc.end - sample_point_offset_std + samples_per_bit_std - dec_item_margin;
ScanaStudio.dec_item_new( ch, start_sample, end_sample);
ScanaStudio.dec_item_add_content("DLC = " + can_dlc.value.toString());
ScanaStudio.dec_item_add_content(can_dlc.value.toString());
add_can_bits_sampling_points(can_bits,0,4);
ScanaStudio.dec_item_end();
ScanaStudio.packet_view_add_packet(false, ch, start_sample, end_sample, "DLC", can_dlc.value.toString(),
ScanaStudio.PacketColors.Preamble.Title, ScanaStudio.PacketColors.Preamble.Content);
if (can_len > 0)
{
can_state_machine = CAN.SEEK_DATA;
}
else
{
if (is_can_fd_frame)
{
stuff_mode = 2;
recalculated_crc = crc_calc(crc_bits_all,crc_len)
if (can_fd_iso)
{
can_state_machine = CAN.SEEK_STUFF_CNT;
}
else {
can_state_machine = CAN.SEEK_CRC;
}
}
else
{
stuff_mode = 1;
recalculated_crc = crc_calc(crc_bits_destuffed,crc_len)
can_state_machine = CAN.SEEK_CRC;
}
}
can_byte_counter = 0;
can_bits = [];
}
break;
case CAN.SEEK_FD_R0_BRS:
can_destuffed_bit_counter++;
if (can_destuffed_bit_counter == 2)
{
can_destuffed_bit_counter = 0;
can_r0 = interpret_can_bits(can_bits,0,1);
can_brs = interpret_can_bits(can_bits,1,1);
start_sample = can_r0.start - sample_point_offset_std + dec_item_margin;
end_sample = can_r0.end - sample_point_offset_std + samples_per_bit_std - dec_item_margin;
ScanaStudio.dec_item_new( ch, start_sample, end_sample);
ScanaStudio.dec_item_add_content("R0");
add_can_bits_sampling_points(can_bits,0,1);
ScanaStudio.dec_item_end();
ScanaStudio.packet_view_add_packet(false, ch, start_sample, end_sample, "R0", "",
ScanaStudio.PacketColors.Preamble.Title, ScanaStudio.PacketColors.Preamble.Content);
if (can_brs.value == 1)
{
start_sample = can_brs.start - sample_point_offset_std + (samples_per_brs_bit/50);
end_sample = can_brs.end - sample_point_offset_std + samples_per_brs_bit - (samples_per_brs_bit/50);
ScanaStudio.dec_item_new( ch, start_sample, end_sample);
ScanaStudio.dec_item_add_content("BRS = 1 (Switching bit rate)");
ScanaStudio.dec_item_add_content("BRS = 1");
ScanaStudio.packet_view_add_packet(false, ch, start_sample, end_sample, "BRS", "Switching bit rate",
ScanaStudio.PacketColors.Misc.Title, ScanaStudio.PacketColors.Misc.Content);
//scanastudio.console_info_msg("Switching to high bit rate on next bit, at cursor = " + sample_point,sample_point);
switch_to_high_baud_rate = true;
is_fd_mode = true;
samples_per_bit = samples_per_bit_fd;
sample_point_offset = sample_point_offset_fd;
}
else
{
start_sample = can_brs.start - sample_point_offset_std + dec_item_margin;
end_sample = can_brs.end - sample_point_offset_std + samples_per_bit_std - dec_item_margin;
ScanaStudio.dec_item_new( ch, start_sample, end_sample);
ScanaStudio.dec_item_add_content("BRS = 0 (No bitrate switch)");
ScanaStudio.dec_item_add_content("BRS = 0");
ScanaStudio.packet_view_add_packet(false, ch, start_sample, end_sample, "BRS", "No bitrate switch",
ScanaStudio.PacketColors.Misc.Title, ScanaStudio.PacketColors.Misc.Content);
}
add_can_bits_sampling_points(can_bits,1,1);
ScanaStudio.dec_item_end();
can_bits = [];
can_state_machine = CAN.SEEK_FD_ESI_DLC;
}
break;
case CAN.SEEK_FD_ESI_DLC:
can_destuffed_bit_counter++;
if (can_destuffed_bit_counter == 5)
{
can_destuffed_bit_counter = 0;
can_esi = interpret_can_bits(can_bits,0,1);
can_dlc = interpret_can_bits(can_bits,1,4);
can_len = get_data_len(can_dlc.value);
start_sample = can_esi.start - sample_point_offset + dec_item_margin;
end_sample = can_esi.end - sample_point_offset + samples_per_bit - dec_item_margin;
ScanaStudio.dec_item_new( ch, start_sample, end_sample);
ScanaStudio.dec_item_add_content("ESI = " + can_esi.value.toString());
ScanaStudio.dec_item_add_content("ESI");
if (can_esi.value == 0)
{
ScanaStudio.dec_item_emphasize_warning();
}
add_can_bits_sampling_points(can_bits,0,1);
ScanaStudio.dec_item_end();
ScanaStudio.packet_view_add_packet(false, ch, start_sample, end_sample, "ESI", can_esi.value.toString(),
ScanaStudio.PacketColors.Misc.Title, ScanaStudio.PacketColors.Misc.Content);
start_sample = can_dlc.start - sample_point_offset + dec_item_margin;
end_sample = can_dlc.end - sample_point_offset + samples_per_bit - dec_item_margin;
ScanaStudio.dec_item_new( ch, start_sample, end_sample);
ScanaStudio.dec_item_add_content("DLC = " + can_dlc.value.toString() + ", Data length = " + can_len.toString());
ScanaStudio.dec_item_add_content("Length = " + can_len.toString());
ScanaStudio.dec_item_add_content(can_len.toString());
add_can_bits_sampling_points(can_bits,1,4);
ScanaStudio.dec_item_end();
ScanaStudio.packet_view_add_packet(false, ch, start_sample, end_sample, "DLC",
"DLC = " + can_dlc.value.toString() + ", Data length = " + can_len.toString(),
ScanaStudio.PacketColors.Misc.Title, ScanaStudio.PacketColors.Misc.Content);
crc_len = crc_get_len(can_len);
if (can_len > 0)
{
can_state_machine = CAN.SEEK_DATA;
}
else
{
stuff_mode = 2;
recalculated_crc = crc_calc(crc_bits_all,crc_len);
if (can_fd_iso)
{
can_state_machine = CAN.SEEK_STUFF_CNT;
}
else {
can_state_machine = CAN.SEEK_CRC;
}
}
can_byte_counter = 0;
can_bits = [];
}
break;
case CAN.SEEK_DATA:
can_destuffed_bit_counter++;
if (can_destuffed_bit_counter == 8)