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52 lines
1.2 KiB
C
52 lines
1.2 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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unsigned fact(unsigned n); // prototype
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int main(void) {
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unsigned volatile x;
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x = fact(0U);
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x = 2U + 3U*fact(1U);
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(void)fact(5U);
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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] = 0;
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GPIO_PORTF_AHB_DATA_BITS_R[LED_BLUE] = LED_BLUE;
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while (1) {
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GPIO_PORTF_AHB_DATA_BITS_R[LED_RED] = LED_RED;
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delay(1000000);
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GPIO_PORTF_AHB_DATA_BITS_R[LED_RED] = 0;
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delay(500000);
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}
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//return 0; // unreachable code
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}
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unsigned fact(unsigned n) {
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// factorial function definition (recursive):
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// 0! = 1
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// n! = n*(n-1)! for n > 0
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if (n == 0U) {
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return 1U;
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}
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else {
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return n * fact(n - 1U);
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}
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}
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