Creating a simple microcontroller stop watch using C code. The stopwatch will show minutes, followed by seconds, followed by tenths of seconds in this format: 00:00:0; for example 05:02:9 or 45:32:0 or 00:00:5.

Starting code:

// A simple stopwatch // The sys clock is modified in system_msp432p401r.c to be 48MHz

#include #include #include "LcdDriver/Crystalfontz128x128_ST7735.h"

// A structure that holds a large set of characteristics for graphics including foreground color, background color, fot of Graphics_Context g_sContext;

void InitGraphics(); void InitFonts(); void Initialize(); void InitTimer();

// makeString gets min, sec and tenth and returns the string made up of them. // Important note: char *string should already have enough space to hold "00:00:0" format // example: makeString(2, 3, 9, myString) will update the content of myString to "02:03:9" void makeString(unsigned int min, unsigned int sec, int unsigned tenth, char *string) { }

int main(void) { Initialize();

unsigned int min = 0, sec = 0, tenth = 0; char string[8] = "00:00:0";

Graphics_drawString(&g_sContext, string, -1, 10, 70, false);

while (1) { } }

void InitGraphics() {

Graphics_initContext(&g_sContext, &g_sCrystalfontz128x128, &g_sCrystalfontz128x128_funcs); Graphics_setForegroundColor(&g_sContext, GRAPHICS_COLOR_YELLOW); Graphics_setBackgroundColor(&g_sContext, GRAPHICS_COLOR_BLUE); Graphics_setFont(&g_sContext, &g_sFontCmtt16);

InitFonts(); Graphics_setFont(&g_sContext, &g_sFontCmss18b);

Graphics_clearDisplay(&g_sContext); }

void InitFonts() { Crystalfontz128x128_Init(); Crystalfontz128x128_SetOrientation(LCD_ORIENTATION_UP); }

void InitTimer() { Timer32_initModule(TIMER32_0_BASE, TIMER32_PRESCALER_1, TIMER32_32BIT, TIMER32_PERIODIC_MODE); }

void Initialize() { // Stop the watchdog timer WDT_A_hold(WDT_A_BASE);

// Initialize the graphics InitGraphics();

// Initialize the timer InitTimer(); }