Data conversion inconsistent #204
Description
Python version
'3.10.9 (tags/v3.10.9:1dd9be6, Dec 6 2022, 20:01:21) [MSC v.1934 64 bit (AMD64)]'
Platform information
'Windows-10-10.0.19044-SP0'
Numpy version
'1.24.1'
mdfreader version
'4.1'
Description
Loading a can file and converting channels fails if conversion is not specified as 1 in the main group but in a sub(?)-group. MDF is a CAN file with version 4.1. Other software tools read and convert the data correctly (but are closed source, e.g. MATLAB)
Example data is as follows:
File info
file_info['ID']
{'id_file': b'MDF ',
'id_vers': b'4.10 ',
'id_prog': b'MDF4Lib\x00',
'id_ver': 410,
'id_unfi_flags': 0,
'id_custom_unfi_flags': 0}
Loading the data with no conversion (just for having data in between the steps, the final result is the same if I apply conversion on load or subsequently). Some info is shown as xxx by me to blank out some information. So the data yields for a working signal called ACC
file_data['ACC']
{'unit': 'm/s²',
'description': '',
'master': 't_274_274',
'masterType': 0,
'data': array([32507, ..., 32342], dtype=uint16),
'conversion': {'type': 1, 'parameters': {'cc_val': (-65.0, 0.002)}},
'axis': [],
'id': ((274, 0, 64),
('xxx', 'xxx', 'xxx'),
('xxx', 'xxx', 'xxx'))}
then converting ACC, the result is correct
{'unit': 'm/s²',
'description': '',
'master': 't_274_274',
'masterType': 0,
'data': array([ 0.014, ..., -0.316]),
'axis': [],
'id': ((274, 0, 64),
('xxx', 'xxx', 'xxx'),
('xxx', 'xxx', 'xxx'))}
for a not working signal called temp
file_data['temp']
{'unit': '°C',
'description': '',
'master': 't_222_222',
'masterType': 0,
'data': array([820, ..., 960], dtype=uint16),
'conversion': {'type': 7,
'parameters': {'cc_val': (16381.0, 16382.0, 16383.0),
'cc_ref': ['Reserviert_nicht_verfuegbar',
'Reserviert_Fehler',
'Signal_unbefuellt',
{'pointer': 579024,
'id': b'##CC',
'length': 96,
'link_count': 4,
'cc_tx_name': 0,
'cc_md_unit': 578992,
'cc_md_comment': 0,
'cc_cc_inverse': 0,
'cc_type': 1,
'cc_precision': 0,
'cc_flags': 0,
'cc_ref_count': 0,
'cc_val_count': 2,
'cc_phy_range_min': 0.0,
'cc_phy_range_max': 0.0,
'cc_val': (-100.0, 0.1),
'unit': {'id': b'##TX',
'length': 32,
'link_count': 0,
'Comment': '°C'}}]}},
'axis': [],
'id': ((222, 0, 368),
('xxx', 'xxx', 'xxx'),
('xxx', 'xxx', 'xxx'))}
and then conversion for a not working signal called temp - the conversion is consumed but the data is the same. The conversion global type seems 7 but the true correct conversion that other software reads is 1 and the parameters are specified in a sub-group
{'unit': '°C',
'description': '',
'master': 't_222_222',
'masterType': 0,
'data': array([820, ..., 960], dtype=uint16),
'axis': [],
'id': ((222, 0, 368),
('xxx', 'xxx', 'xxx'),
('xxx', 'xxx', 'xxx'))}