Group21_Lab5/main.c

66 lines
3.0 KiB
C
Raw Normal View History

2024-09-20 19:51:56 +05:30
#include <stdint.h>
#include <stdbool.h>
2024-09-20 19:57:15 +05:30
#include "tm4c123gh6pm.h"
// SysTick memory-mapped registers
2024-09-20 21:38:29 +05:30
#define STCTRL *((volatile uint32_t *) 0xE000E010) // CONTROL AND STATUS
#define STRELOAD *((volatile uint32_t *) 0xE000E014) // RELOAD VALUE
#define STCURRENT *((volatile uint32_t *) 0xE000E018) // CURRENT VALUE
#define CLOCK_HZ 16000000 // CLOCK FREQUENCY OF EK-TM4C123GXL
2024-09-20 20:18:04 +05:30
#define SYSTICK_RELOAD_VALUE(us) ((CLOCK_HZ / 1000000) * (us) - 1) // SYSTICK RELOAD VALUE
void GPIO_PORT_F_init(void)
{
2024-09-20 21:38:29 +05:30
SYSCTL_RCGC2_R |= 0x00000020; // ENABLE CLOCK TO GPIOF
GPIO_PORTF_LOCK_R = 0x4C4F434B; // UNLOCK COMMIT REGISTER
GPIO_PORTF_CR_R = 0x1F; // MAKE PORTF0 CONFIGURABLE
GPIO_PORTF_DEN_R = 0x1F; // SET PORTF DIGITAL ENABLE
GPIO_PORTF_DIR_R = 0x0E; // SET PF0, PF4 as input and PF1, PF2 and PF3 as output
GPIO_PORTF_PUR_R = 0x11; // PORTF PF0 and PF4 IS PULLED UP
2024-09-20 20:18:04 +05:30
NVIC_EN0_R |= 1 << 30;
GPIO_PORTF_IS_R = 0x00; // Make it edge-sensitive
GPIO_PORTF_IBE_R = 0x00; // Trigger on one edge
GPIO_PORTF_IEV_R = 0x00; // Falling edge event
GPIO_PORTF_IM_R |= 0x11; // Unmask interrupts for PF0 and PF4
}
2024-09-20 21:32:19 +05:30
void systick_setting(void) // SYSTICK SETUP FUNCTION
2024-09-20 20:20:35 +05:30
{
2024-09-20 21:32:19 +05:30
STRELOAD = SYSTICK_RELOAD_VALUE(1000); // RELOAD VALUE FOR 1ms
STCTRL |= (1 << 0) | (1 << 2); // Enable SysTick with system clock
STCURRENT = 0; // Clear current value
2024-09-20 20:20:35 +05:30
}
2024-09-20 20:21:11 +05:30
2024-09-20 21:32:19 +05:30
void delay(int us) //DEFINING DELAY FUNCTION
2024-09-20 20:21:11 +05:30
{
2024-09-20 21:32:19 +05:30
STRELOAD = SYSTICK_RELOAD_VALUE(us); // RELOAD VALUE FOR REQUIRED DELAY
STCURRENT = 0; // Clear STCURRENT
STCTRL |= (1 << 0) | (1 << 2); // Enable SysTick
while ((STCTRL & (1 << 16)) == 0); // Wait until flag is set
STCTRL &= 0x0; // Stop the timer
}
void GPIOF_interruptHandler(void) // Interrupt handler for GPIO Port F
{
delay(200000); // DEBOUNCE DELAY
if (GPIO_PORTF_RIS_R & 0x10) // CHECK IF SWITCH 1 CAUSED INTERRUPT
{
GPIO_PORTF_DATA_R ^= 0x02; // TOGGLE RED LED
GPIO_PORTF_ICR_R = 0x10; // CLEAR INTERRUPT FLAG FOR SWITCH 1
}
if (GPIO_PORTF_RIS_R & 0x01) // CHECK IF SWITCH 2 CAUSED INTERRUPT
{
GPIO_PORTF_DATA_R ^= 0x02; // TOGGLE RED LED
GPIO_PORTF_ICR_R = 0x01; // CLEAR INTERRUPT FLAG FOR SWITCH 1
}
2024-09-20 20:21:11 +05:30
}
2024-09-20 21:38:29 +05:30
int main(void) // MAIN FUNCTION
{
GPIO_PORT_F_init(); // GPIO INITIALISATION FUNCTION
systick_setting(); // SYSTICK SETUP
while (1)
{ // DO NOTHING
}
}