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50 lines
1.3 KiB
C
50 lines
1.3 KiB
C
#include "tm4c.h" // the same as "lm4f120h5qr.h" in the video
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#include "delay.h"
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#define LED_RED (1U << 1)
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#define LED_BLUE (1U << 2)
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#define LED_GREEN (1U << 3)
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int *swap(int *x, int *y);
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int *swap(int *x, int *y) {
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static int tmp[2];
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tmp[0] = *x;
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tmp[1] = *y;
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*x = tmp[1];
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*y = tmp[0];
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return tmp;
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}
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int main(void) {
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SYSCTL_GPIOHBCTL_R |= (1U << 5); /* enable AHB for GPIOF */
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SYSCTL_RCGCGPIO_R |= (1U << 5); /* enable clock for GPIOF */
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GPIO_PORTF_AHB_DIR_R |= (LED_RED | LED_BLUE | LED_GREEN);
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GPIO_PORTF_AHB_DEN_R |= (LED_RED | LED_BLUE | LED_GREEN);
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/* start with turning all LEDs off (note the use of array []) */
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GPIO_PORTF_AHB_DATA_BITS_R[LED_RED | LED_BLUE | LED_GREEN] = 0U;
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int x = 1000000;
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int y = 1000000/2;
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while (1) {
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int *p = swap(&x, &y);
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GPIO_PORTF_AHB_DATA_BITS_R[LED_RED] = LED_RED;
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delay(p[0]);
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GPIO_PORTF_AHB_DATA_BITS_R[LED_RED] = 0;
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delay(p[1]);
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}
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//return 0; // unreachable code
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}
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////////////////////////////////////////////////////////////////
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// NOTE:
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// The file main_fact.c in the project directory contains code
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// that CORRUPTS and eventuall OVERFLOWS the stack as explained
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// in the Lesson-10 video.
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// To use the other file, simply copy main_fact.c to main.c.
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