45 lines
1.6 KiB
C
45 lines
1.6 KiB
C
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/**
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* \file firmware/modelibmmodelm.c
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* \brief Hardware specific part for IBM Model M keyboard
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* \author Ronald Schaten <ronald@schatenseite.de>
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* \version $Id: main.c,v 1.6 2008/07/15 05:16:41 rschaten Exp $
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*
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* License: GNU GPL v2 (see License.txt)
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*/
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#include <stdint.h>
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/**
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* Initialize hardware. Configure ports as inputs and outputs, set USB reset
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* condition, start timer and blink LEDs.
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*/
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void hardwareInit(void);
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/**
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* Print the current state of the keyboard in a readable form. This function
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* is used for debug-purposes only.
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*/
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void printMatrix(void);
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/**
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* This function sets the LEDs according to the given data.
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* \param LEDstate bitfield with LED info
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*/
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void setLeds(uint8_t LEDstate);
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/**
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* Scan and debounce keypresses. This is the main worker function for normal
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* keyboard operation, the code contains lot of comments. Basically, it first
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* scans the keyboard state. If a change is detected, it initializes a counter
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* that is decreased each time this function is called. If the counter reaches
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* 1, that means that the same scan result has been scanned ten times in a row,
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* so we can be pretty sure that the keys are in a certain state (as in: not
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* bouncing). Then, the codes for keys and modifiers are searched from the two
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* arrays, the USB-message to send the state is prepared. The return value of
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* this function indicates if the message has to be sent.
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* \param reportBuffer array with the current USB report
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* \param oldReportBuffer array with the last USB report
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* \return flag to indicate whether something has changed
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*/
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uint8_t scankeys(uint8_t* reportBuffer, uint8_t* oldReportBuffer, uint8_t sizeOfReportBuffer);
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