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-IO port
-=======
-And define: `CONFIG_IOE_IOPORT`
-
-Defines simple access to io ports. This allows runtime access to any pin with just
-serialized identifier.
-
-Most of the functions has group and mask arguments. Group is letter, but in this
-library is represented as number and exact number is defined as macro definition.
-Mask is one shifted by index number(use \_BV macro). This way can be
-addressed all IO ports. Exact identification consult with datasheet. You can also
-use more than one index number and control more ports in single group with single
-command.
-
-WARNING: No check is implemented for right group number. Usage of unsupported
-value is undefined (write to other parts of memory can happen).
-
-Configuration
--------------
-To use this part, you must enable `CONFIG_IOPORTS` option.  
-This part also handles pin change interrupts. Enable it using
-`CONFIG_IOPORTS_PCINT` option.
-
-References
-----------
-### For output
-#### Function io_setout
-```C
-static inline void io_setout(uint8_t group, uint8_t mask)
-```
-Configures port of `group` with `mask` as output.  
-Parameters:  
-__group__ - Character specifying exact port group  
-__mask__  - Binary shifted 1. Shift is equal to port index in specified group.  
-
-#### Function io_hight
-```C
-static inline void io_hight(uint8_t group, uint8_t mask)
-```
-Sets output port to hight (also can be called as 1).  
-WARNING: Invoke this only if io_setout is called before.
-
-Parameters:  
-__group__ - Character specifying exact port group  
-__mask__  - Binary shifted 1. Shift is equal to port index in specified group.  
-
-#### Function io_low
-```C
-static inline void io_low(uint8_t group, uint8_t mask)
-```
-Sets output port to low (also called as 0).  
-WARNING: Invoke this only if io_setout is called before.
-
-Parameters:  
-__group__ - Number specifying exact port group  
-__mask__  - Binary shifted 1. Shift is equal to port index in specified group.  
-
-#### Function io_set
-```C
-static inline void io_set(uint8_t group, uint8_t mask, int8_t val)
-```
-Sets output port to value passed as argument.  
-WARNING: Invoke this only if io_setout is called before.  
-Parameters:  
-__group__ - Number specifying exact port group  
-__mask__  - Binary shifted 1. Shift is equal to port index in specified group.  
-
-### For input
-#### Function io_setin
-```C
-static inline void io_setin(uint8_t group, uint8_t mask,
-                                enum ioeIOInResistor resistor)
-```
-Configures port of `group` with `mask` as input with specified pull-up/down
-resistor.
-
-Parameters:  
-__group__ - Number specifying exact port group  
-__mask__  - Binary shifted 1. Shift is equal to port index in specified group.  
-
-#### Function io_get
-```C
-static inline int8_t io_get(uint8_t group, uint8_t mask)
-```
-Returns current value of port. Note that you can use this also if port is
-configured as output.
-
-Parameters:  
-__group__ - Number specifying exact port group  
-__mask__  - Binary shifted 1. Shift is equal to port index in specified group.  
-
-#### Enum ioeIOInResistor
-```C
-enum ioeIOInResistor {
-    IOE_IO_PULLUP,
-    IOE_IO_PULLDOWN
-};
-```
-This enum is used as argument for io_setin. Names should be self explanatory
-in this case.
-
-### Pin change interrupts
-#### Function io_change_sethook
-```C
-int8_t io_change_sethook(uint8_t group, uint8_t mask, uint8_t edge,
-                           void (*change) (uint8_t group, uint8_t mask))
-```
-Registers function `change` as hook for pin change interrupt. `group` and `mask`
-specifies port and edge specifies on what edge should hook be called. `edge` can
-be IO_RISING or IO_FALLING or their binary combination with operator
-`|`.  
-WARNING: `change` call is call during interrupt handling. You shouldn't be
-blocking execution for long time.
-
-Parameters:  
-__group__  - Number specifying exact port group.  
-__mask__   - Binary shifted 1. Shift is equal to port index in specified group.  
-__edge__   - Signals on what edge should be hook called.  
-__change__ - Pointer to function used as interupt hook.  
-
-#### Function io_change_remhook
-```C
-int8_t io_change_remhook(void (*change) (uint8_t group, uint8_t mask))
-```
-Removes `change` hook.
-
-Parameters:  
-__change__ - Pointer to function used as hook
-
-### Others
-#### Definitions IO_{GROUP}
-This defines exact numbers related to data-sheet groups. Always use these
-definition not direct numbers, you can ensure cross MCU support this way.
-
-#### Definitions IO_{GROUP}{INDEX}
-Because specifying group and mask as separate parameters is not always optimal,
-mcu support file should define all ports in form of single line definition in
-format `IOE_IO_{GROUP}{INDEX}`. Disadvantage is that with these definitions you
-can't use binary conjunction and so only one pin can be controlled with it.
-
-Relevant examples
------------------
-* blink
-* pcinterrupt
-
-Adding support
---------------
-For more information on how add support, see [Adding MCU support](/add_support.md).
-Main definition is `MCUSUPPORT_IOPORT`. Define it to enable support.
-
-### IO_{GROUP}
-This should define any number that is handy for implementation of `IOE_IOE_PIN`,
-`IOE_IO_DDR` and `IOE_IO_PORT`.
-
-### IO_{PIN/DDR/PORT}
-These should calculate exact pointers to register `PORT{GROUP}` for PORT variant
-and likewise for others with group as argument. Common implementation would be
-like this:
-```C
-#define IOE_IO_PIN(GROUP)  (* (volatile uint8_t *)(PINB + 0x3*GROUP))
-```
-### IO_{GROUP}{INDEX}
-This should be pair of group and one binary shifted to left relative to index.
-
-### MCUSUPPORT_PCINT{NUM}
-This defines that MCU supports specific pin change interrupt group. Also it
-defines value that is number of pins in group.