8 years, 7 months ago.

The example code is giving me compiler error 20 and I have no idea why

I literally just imported the library exactly as it is, updated the mbed repository, and it gave me this: http://imgur.com/rZs0YTo

Errors contained in image: Error: Identifier "p15" is undefined in "main.cpp", Line: 6, Col: 14 Error: Identifier "p16" is undefined in "main.cpp", Line: 6, Col: 19 Error: Identifier "p17" is undefined in "main.cpp", Line: 6, Col: 24 Error: Identifier "p18" is undefined in "main.cpp", Line: 6, Col: 29 Error: Identifier "p19" is undefined in "main.cpp", Line: 6, Col: 34 Error: Identifier "p20" is undefined in "main.cpp", Line: 6, Col: 39

Code used:

<code>

1. include "mbed.h"
2. include "TextLCD.h"

TextLCD lcd(p15, p16, p17, p18, p19, p20, TextLCD::LCD20x4); rs, e, d4-d7

int main() { lcd.printf("Hello World!\n"); } </code>

Compiler error 20 tells me "The compiler doesn't recognize the name of a variable or class you are trying to reference", The class is referenced in TextLCD.h;

<code> class TextLCD : public Stream { public:

/ LCD panel format */ enum LCDType { LCD16x2 /< 16x2 LCD panel (default) */ , LCD16x2B /< 16x2 LCD panel alternate addressing */ , LCD20x2 /< 20x2 LCD panel */ , LCD20x4 /< 20x4 LCD panel */ };

/ Create a TextLCD interface

• @param rs Instruction/data control line
• @param e Enable line (clock)
• @param d0-d3 Data lines
• @param type Sets the panel size/addressing mode (default = LCD16x2)
• / TextLCD(PinName rs, PinName e, PinName d0, PinName d1, PinName d2, PinName d3, LCDType type = LCD16x2);

1. if DOXYGEN_ONLY / Write a character to the LCD

• @param c The character to write to the display
• / int putc(int c);

/ Write a formated string to the LCD

• @param format A printf-style format string, followed by the
• variables to use in formating the string.
• / int printf(const char* format, ...);

1. endif

/ Locate to a screen column and row

• @param column The horizontal position from the left, indexed from 0
• @param row The vertical position from the top, indexed from 0
• / void locate(int column, int row);

/ Clear the screen and locate to 0,0 */ void cls();

int rows(); int columns();

protected:

Stream implementation functions virtual int _putc(int value); virtual int _getc();

int address(int column, int row); void character(int column, int row, int c); void writeByte(int value); void writeCommand(int command); void writeData(int data);

DigitalOut _rs, _e; BusOut _d; LCDType _type;

int _column; int _row; };

1. endif </code>

Maybe my programming is rusty, and this is probably something really obvious, but I'm just not getting what is wrong. Can anyone help? Thanks!

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