59 lines
2.1 KiB
C
59 lines
2.1 KiB
C
/**
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* main.c
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*
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* ECE 3849 Lab 0 Starter Project
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* Gene Bogdanov 10/18/2017
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*
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* This version is using the new hardware for B2017: the EK-TM4C1294XL LaunchPad with BOOSTXL-EDUMKII BoosterPack.
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*
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*/
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#include <stdint.h>
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#include <stdbool.h>
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#include "driverlib/fpu.h"
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#include "driverlib/sysctl.h"
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#include "driverlib/interrupt.h"
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#include "Crystalfontz128x128_ST7735.h"
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#include <stdio.h>
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uint32_t gSystemClock; // [Hz] system clock frequency
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volatile uint32_t gTime = 8345; // time in hundredths of a second
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int main(void)
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{
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IntMasterDisable();
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// Enable the Floating Point Unit, and permit ISRs to use it
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FPUEnable();
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FPULazyStackingEnable();
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// Initialize the system clock to 120 MHz
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gSystemClock = SysCtlClockFreqSet(SYSCTL_XTAL_25MHZ | SYSCTL_OSC_MAIN | SYSCTL_USE_PLL | SYSCTL_CFG_VCO_480, 120000000);
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Crystalfontz128x128_Init(); // Initialize the LCD display driver
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Crystalfontz128x128_SetOrientation(LCD_ORIENTATION_UP); // set screen orientation
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tContext sContext;
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GrContextInit(&sContext, &g_sCrystalfontz128x128); // Initialize the grlib graphics context
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GrContextFontSet(&sContext, &g_sFontFixed6x8); // select font
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uint32_t time; // local copy of gTime
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char str[50]; // string buffer
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// full-screen rectangle
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tRectangle rectFullScreen = {0, 0, GrContextDpyWidthGet(&sContext)-1, GrContextDpyHeightGet(&sContext)-1};
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while (true) {
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GrContextForegroundSet(&sContext, ClrBlack);
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GrRectFill(&sContext, &rectFullScreen); // fill screen with black
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time = gTime; // read shared global only once
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uint32_t hundredths = time % 100;
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uint32_t seconds = (time / 100) % 60;
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uint32_t minutes = (time / (100 * 60));
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snprintf(str, sizeof(str), "Time = %02u:%02u:%02u", minutes, seconds, hundredths); // convert time to string
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GrContextForegroundSet(&sContext, ClrYellow); // yellow text
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GrStringDraw(&sContext, str, /*length*/ -1, /*x*/ 0, /*y*/ 0, /*opaque*/ false);
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GrFlush(&sContext); // flush the frame buffer to the LCD
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}
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}
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