Silicon Laboratories Stepper Machine Instrukcja Użytkownika Pobierz pdf (Strona 32)

AN155

32 Rev. 1.1

}

return i; // return uchar value

}

//-----------------------------------------------------------------------------

void newline(void) // normally cr and lf are used together

{

putc('\r'); // output carriage return

putc('\n'); // output linefeed

}

//-----------------------------------------------------------------------------

// getc

// Gets a character from the read buffer using readc().

// The getc() function also echos the incoming keystrokes to the display;

char getc(void)

{

char theChar;

theChar=readc(); // get character using readc

writec(theChar); // echo characters to display

return theChar;

}

//-----------------------------------------------------------------------------

// putc

// This is a totally unnecessary layer of abstraction. It is only used to be

// consistent with the getc function which requires an additional layer of

// abstraction to handle character echo.

void putc(char theChar)

{

writec(theChar);

}

//-----------------------------------------------------------------------------

void readClear(void) // clears read buffer

{

unsigned char i;

readCount=0;

readIndex=0;

i = READ_BUFFER_SIZE;

{

i--; // predecrement

readBuffer[i]=0; // zero all data

} while (i != 0);

}

//-----------------------------------------------------------------------------

void writeClear(void) // clears write buffer

{

unsigned char i;

writeCount=0;

writeIndex=0;

i = WRITE_BUFFER_SIZE;

{

i--; // predecrement

writeBuffer[i]=0; // zero all data

} while (i != 0);

}

//-----------------------------------------------------------------------------

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