41 lines
2.1 KiB
C
41 lines
2.1 KiB
C
#include <stdint.h>
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#include <stdbool.h>
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#include "tm4c123gh6pm.h"
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// SysTick memory-mapped registers
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#define STCTRL *((volatile uint32_t *) 0xE000E010) // CONTROL AND STATUS
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#define STRELOAD *((volatile uint32_t *) 0xE000E014) // RELOAD VALUE
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#define STCURRENT *((volatile uint32_t *) 0xE000E018) // CURRENT VALUE
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#define CLOCK_HZ 16000000 // CLOCK FREQUENCY OF EK-TM4C123GXL
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#define SYSTICK_RELOAD_VALUE(us) ((CLOCK_HZ / 1000000) * (us) - 1) // SYSTICK RELOAD VALUE
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void GPIO_PORT_F_init(void)
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{
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SYSCTL_RCGC2_R |= 0x00000020; // ENABLE CLOCK TO GPIOF
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GPIO_PORTF_LOCK_R = 0x4C4F434B; // UNLOCK COMMIT REGISTER
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GPIO_PORTF_CR_R = 0x1F; // MAKE PORTF0 CONFIGURABLE
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GPIO_PORTF_DEN_R = 0x1F; // SET PORTF DIGITAL ENABLE
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GPIO_PORTF_DIR_R = 0x0E; // SET PF0, PF4 as input and PF1, PF2 and PF3 as output
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GPIO_PORTF_PUR_R = 0x11; // PORTF PF0 and PF4 IS PULLED UP
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NVIC_EN0_R |= 1 << 30;
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GPIO_PORTF_IS_R = 0x00; // Make it edge-sensitive
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GPIO_PORTF_IBE_R = 0x00; // Trigger on one edge
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GPIO_PORTF_IEV_R = 0x00; // Falling edge event
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GPIO_PORTF_IM_R |= 0x11; // Unmask interrupts for PF0 and PF4
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}
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void systick_setting(void) // SYSTICK SETUP FUNCTION
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{
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STRELOAD = SYSTICK_RELOAD_VALUE(1000); // RELOAD VALUE FOR 1ms
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STCTRL |= (1 << 0) | (1 << 2); // Enable SysTick with system clock
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STCURRENT = 0; // Clear current value
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}
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void delay(int us) //DEFINING DELAY FUNCTION
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{
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STRELOAD = SYSTICK_RELOAD_VALUE(us); // RELOAD VALUE FOR REQUIRED DELAY
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STCURRENT = 0; // Clear STCURRENT
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STCTRL |= (1 << 0) | (1 << 2); // Enable SysTick
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while ((STCTRL & (1 << 16)) == 0); // Wait until flag is set
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STCTRL &= 0x0; // Stop the timer
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}
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