new ihex parser
parent
e2cfa50262
commit
7bde2a159e
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@ -14,58 +14,49 @@ function read_hex_file(data) {
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var result = {
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data: [],
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end_of_file: false,
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extended_linear_address: [],
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start_linear_address: 0,
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bytes: 0
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bytes_total: 0,
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start_linear_address: 0
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};
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var next_address_pos = 0;
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var extended_linear_address = 0;
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var next_address = 0;
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for (var i = 0; i < data.length; i++) {
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var byte_count = parseInt(data[i].substr(1, 2), 16); // each byte is represnted by two chars
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var address = data[i].substr(3, 4);
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var record_type = parseInt(data[i].substr(7, 2), 16); // also converting from hex to decimal
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var content = data[i].substr(9, byte_count * 2);
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var checksum = parseInt(data[i].substr(9 + byte_count * 2, 2), 16); // also converting from hex to decimal (this is a 2's complement value)
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for (var i = 0; i < data.length && hexfile_valid; i++) {
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// each byte is represnted by two chars
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var byte_count = parseInt(data[i].substr(1, 2), 16);
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var address = parseInt(data[i].substr(3, 4), 16);
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var record_type = parseInt(data[i].substr(7, 2), 16);
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var content = data[i].substr(9, byte_count * 2); // still in string format
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var checksum = parseInt(data[i].substr(9 + byte_count * 2, 2), 16); // (this is a 2's complement value)
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switch (record_type) {
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case 0x00: // data record
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// fix "holes" if there are any
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if (parseInt(address, 16) != next_address_pos) {
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var difference = parseInt(address, 16) - (next_address_pos);
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// fill in the difference
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for (var x = 0; x < difference; x++) {
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result.data.push(0xFF);
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result.bytes++;
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if (address != next_address || next_address == 0) {
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result.data.push({'address': extended_linear_address + address, 'bytes': 0, 'data': []});
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}
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console.log('HEX_PARSER - Address hole detected, expected: ' + next_address_pos + ', received: ' + parseInt(address, 16) + ', filling: ' + difference + ' bytes');
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}
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// update for next comparison
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next_address_pos = parseInt(address, 16) + byte_count;
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// store address for next comparison
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next_address = address + byte_count;
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// process data
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var crc = byte_count + parseInt(address.substr(0, 2), 16) + parseInt(address.substr(2, 2), 16) + record_type;
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for (var needle = 0; needle < byte_count * 2; needle += 2) {
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var crc = byte_count + parseInt(data[i].substr(3, 2), 16) + parseInt(data[i].substr(5, 2), 16) + record_type;
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for (var needle = 0; needle < byte_count * 2; needle += 2) { // * 2 because of 2 hex chars per 1 byte
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var num = parseInt(content.substr(needle, 2), 16); // get one byte in hex and convert it to decimal
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result.data.push(num);
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var data_block = result.data.length - 1;
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result.data[data_block].data.push(num);
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result.data[data_block].bytes++;
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crc += num;
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result.bytes++;
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result.bytes_total++;
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}
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// change crc to 2's complement (same as checksum)
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crc = ~crc + 1;
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crc &= 0xFF;
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// change crc to 2's complement
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crc = (~crc + 1) & 0xFF;
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// verify
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if (crc != checksum) {
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hexfile_valid = false;
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// break out of the for loop as crc is wrong anyway, we dont need to process any more data
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i = data.length;
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}
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break;
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case 0x01: // end of file record
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@ -79,30 +70,15 @@ function read_hex_file(data) {
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break;
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case 0x03: // start segment address record
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// not implemented
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if (parseInt(content, 16) != 0) { // ignore if segment is 0
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console.log('start segment address record found - NOT IMPLEMENTED !!!');
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}
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break;
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case 0x04: // extended linear address record
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var extended_linear_address = (parseInt(content.substr(0, 2), 16) << 24) | parseInt(content.substr(2, 2), 16) << 16;
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result.extended_linear_address.push(extended_linear_address);
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if (next_address_pos != 0) { // dont execute the first time
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extended_linear_address -= 0x08000000;
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var difference = extended_linear_address - next_address_pos;
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// fill in the difference
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for (var x = 0; x < difference; x++) {
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result.data.push(0xFF);
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result.bytes++;
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}
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if (difference > 0) console.log('HEX_PARSER - Address hole detected (changing linear address), expected: ' + next_address_pos + ', received: ' + extended_linear_address + ', filling: ' + difference + ' bytes');
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// reset some variables
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next_address_pos = 0;
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}
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extended_linear_address = (parseInt(content.substr(0, 2), 16) << 24) | parseInt(content.substr(2, 2), 16) << 16;
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break;
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case 0x05: // start linear address record
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result.start_linear_address = (parseInt(content.substr(0, 2), 16) << 24) | (parseInt(content.substr(2, 2), 16) << 16) | (parseInt(content.substr(4, 2), 16) << 8) | parseInt(content.substr(6, 2), 16);
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result.start_linear_address = parseInt(content, 16)
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break;
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}
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}
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