On the fly configuration of electronic device with attachable sub-modules
Electronic device ( 10 ) comprising a control unit ( 11 ), a plurality of slots ( 15 ) for attaching/connecting sub-modules ( 12, 13 ), and means ( 15, 16, 17 ) for interconnecting the control unit ( 11 ) with those sub-modules ( 12, 13 ) that are attached/connected to the slots ( 15 ). The control unit ( 11 ) is capable of issuing commands in order to put the sub-modules ( 12, 13 ) in a by-pass mode, to read identification information from sub-modules ( 12, 13 ), write parameters into and/or read parameters from at least one of the sub-modules ( 12, 13 ), and to re-check whether the configuration of the electronic device ( 10 ) has changed by adding or removing a sub-module ( 12, 13 ).
1. A method, comprising:
detecting attachment of a newly-attached sub-module to a slot of an electronic device that includes a control unit, configured to run an application program, and a plurality of slots for attaching sub-modules for use with the application;
automatically configuring the electronic device to operate with the newly-attached sub-module in response to detecting attachment of the newly-attached sub-module, the automatically configuring comprising:
reading identification information from the newly-attached sub-module by applying a JTAG command from the control unit to the newly-attached sub-module,
transferring parameters into or from a register of the newly-attached sub-module by applying a JTAG command, specifying the register, from the control unit to the newly-attached sub-module, wherein said parameters are used during operation of the application program in conjunction with the newly-attached sub-module, wherein the reading is carried out by:
sending from the control unit a JTAG command to a first sub-module, to put the first sub-module in a by-pass mode,
repeating the previous step until all sub-modules, except for the newly-attached sub-module are in a by-pass mode,
reading the identification information from the newly-attached sub-module that is not in the by-pass mode,
sending from the control unit a JTAG command to the newly-attached sub-module that is not in the by-pass mode, to put it in a by-pass mode,
sending from the control unit a JTAG command to another sub-module to remove the by-pass mode,
reading identification information from the another sub-module that is not in the by-pass mode, and
repeating the previous steps until the identification information of all sub-modules has been read.
2. The method of claim 1 , further comprising re-checking a configuration of the electronic device from time to time to detect whether the configuration has changed, whereby the re-checking of the configuration is done by reading the parameters after writing them into one or more of the sub-modules.
3. The method of claim 1 , further comprising using JTAG commands by the control unit for controlling the sub-modules.
4. The method of claim 3 , further comprising issuing a JTAG BYPASS command by the control unit to put the sub-modules in a by-pass mode.
5. The method of claim 2 , further comprising issuing a JTAG IDCODE command by the control unit to read the identification information from a sub-module that is not in a by-pass mode.
6. The method of claim 1 , further comprising modifying operation of the application responsive to detecting that the configuration has changed.
7. The method of claim 1 , wherein rechecking the configuration is performed while running the application.