2.1.3.3.1 Configurable Digital I/O
The Commander core has 32 general-purpose configurable digital I/O available. The IO command can be used to access the current configurable I/O status. The value must be a 32-bit integer.
Configurable digital I/O can also be accessed one bit at a time using the IO[1-32] commands. Note that the indexes are 1-based for the bit references. For example, IO1 refers to bit 0, not bit 1.
In order to set a configurable digital I/O as an input or output, use the IOCFG command. If a bit in the 32-bit IOCFG value is set to 0, the corresponding configurable digital I/O will be defined as an input. If the bit is 1, the configurable digital I/O will be defined as an output.
The initial state of the configurable digital I/O can be defined by setting the 32-bit IOBOOT register to the desired initial configured output value. The IOBOOT value will only be applicable to configurable I/O defined as outputs by the IOCFG command. The IOBOOT value must be a 32-bit value. The value is stored to flash memory once the STORE command is issued. The settings take effect on the next power cycle.
The 2-bit IOP command can be used to toggle the polarity of the configurable I/O. See table IOP command below.
|
Bit |
Description |
Setting |
|
|
0 |
Logic of input setting |
0 - Negative logic Active Low |
1 - Positive logic Active High |
|
1 |
Logic of output setting |
0 - Negative logic Active Low |
1 - Positive logic Active High |
IOP command
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