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38 lines
1.1 KiB
C
38 lines
1.1 KiB
C
#include "tm4c.h" // the same as "lm4f120h5qr.h" in the video
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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 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] = 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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//*((unsigned long volatile *)(0x40025000 + (LED_RED << 2))) = LED_RED;
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//*(GPIO_PORTF_DATA_BITS_R + LED_RED) = LED_RED;
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GPIO_PORTF_AHB_DATA_BITS_R[LED_RED] = LED_RED;
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int volatile counter;
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counter = 0;
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while (counter < 1000000) { // delay loop
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++counter;
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}
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GPIO_PORTF_AHB_DATA_BITS_R[LED_RED] = 0;
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counter = 0;
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while (counter < 1000000) { // delay loop
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++counter;
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}
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}
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//return 0; // unreachable code
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}
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