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Classpad Dev

Debug

Overview

Debug methods should be called inside a prepared environment, so be sure to do both a calcInit(), calcEnd() and some manual LCD_Refresh() when using them.

Some of the debug methods use a cursor position internally, which can be changed using Debug_SetCursorPosition. Units are character size and not pixels, so setting the cursor at (1,1) means the second line second character.

Methods

Set Cursor Position

void Debug_GetCursorPosition(int x, int y);
void Debug_GetCursorPosition(int *x, int *y);

x and y are the position of the cursor in character size.

bool Debug_PrintString(const char *string, bool invert);

Prints a string in debug text mode, either in normal black-on-white or inverted white-on-black (controlled by the invert parameter)

void Debug_Printf(int x, int y, bool invert, int zero, const char *format, ...);

Print a formatted string in small debug text mode, either in normal black-on-white or inverted white-on-black (controlled by the invert parameter)

Supports most format specifiers:

  • %s for strings
  • %d for decimals

Check the Usage on how to use it.

void Debug_PrintNumberHex_Nibble(uint8_t value, int x, int y);
void Debug_PrintNumberHex_Byte(uint8_t value, int x, int y);
void Debug_PrintNumberHex_Word(uint16_t value, int x, int y);
void Debug_PrintNumberHex_Dword(uint32_t value, int x, int y);

Depending on the value:

  • nibble are 4-bit number
  • byte are 8-bit number
  • word are 16-bit number
  • Dword are 32-bit number

Waits for a key

int Debug_WaitKey();

Waits until a key is pressed, then returns a number representing the key.

More details about its return and behavior in the SDK source code

Usage

#include <sdk/os/debug.hpp>
// Print "Hello, world!" at 0, 0 in black on white
Debug_SetCursorPosition(0, 0);
Debug_PrintString("Hello, world!", false);

// Print "Inverted text" at 1, 1 in white on black
Debug_SetCursorPosition(1, 1);
Debug_PrintString("Inverted text", true);

// Print the number 0x1322 at 3, 7
Debug_PrintNumberHex_Word(0x1322, 3, 7);

// Print small text with a format string
Debug_Printf(10, 10, false, 0, "Just one number : %d", 42);
Debug_Printf(20, 20, false, 0, "Format strings are %s in %d!", "cool", 2018);

// Draw the changes we made to VRAM onto the LCD
// Defined in sdk/os/lcd.hpp
LCD_Refresh();

// Block until the user presses a key
Debug_WaitKey();