107 lines
4.0 KiB
C
107 lines
4.0 KiB
C
#include <stdint.h>
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#include <stdbool.h>
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#include "tm4c123gh6pm.h"
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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 GPIO_PORT_B_init(void)
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{
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SYSCTL_RCGCGPIO_R |= 0x02; // Enable clock to GPIOB
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SYSCTL_RCGCUART_R |= 0x02; // Enable UART1 clock
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GPIO_PORTB_DEN_R |= 0x03; // Enable PB0, PB1 as digital
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GPIO_PORTB_AFSEL_R |= 0x03; // Enable alternate function on PB0, PB1
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GPIO_PORTB_PCTL_R = (GPIO_PORTB_PCTL_R & 0xFFFFFF00) | 0x00000011; // Set PB0, PB1 for UART
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UART1_CTL_R &= ~0x01; // Disable UART1 during setup
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UART1_IBRD_R = 104; // Set integer part of baud rate (for 9600 baud at 16 MHz clock)
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UART1_FBRD_R = 11; // Set fractional part of baud rate
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UART1_LCRH_R = 0x62; // 8-bit, odd parity, 1 stop bit
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UART1_CC_R = 0x00; // Use system clock
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UART1_CTL_R |= 0x301; // Enable UART1, RX, and TX
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}
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void UART1_WRITE(char data)
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{
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while (UART1_FR_R & 0x20); // Wait until TX FIFO is not full
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UART1_DR_R = data; // Write data to UART data register
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}
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char UART1_READ(void)
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{
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while (UART1_FR_R & 0x10); // Wait until RX FIFO is not empty
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return (char)UART1_DR_R; // Return received data
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}
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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 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 GPIOF_interruptHandler(void) // Interrupt handler for GPIO Port F
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{
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//delay(200000); // Debounce delay
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// Check PF4 (Switch 2)
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if (GPIO_PORTF_RIS_R & 0x10) // Check if PF4 caused the interrupt
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{
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//GPIO_PORTF_DATA_R |= 0x02; // Toggle RED LED (PF1)
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//delay(500000);
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UART1_WRITE(0xF0);
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STATUS_LED(UART1_READ());
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//GPIO_PORTF_DATA_R = 0x00; // Toggle RED LED (PF1)
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GPIO_PORTF_ICR_R = 0x10; // Clear interrupt flag for PF4
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}
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// Check PF0 (Switch 1)
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if (GPIO_PORTF_RIS_R & 0x01) // Check if PF0 caused the interrupt
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{
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//GPIO_PORTF_DATA_R |= 0x04; // Toggle RED LED (PF1)
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//delay(500000);
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UART1_WRITE(0xAA);
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//GPIO_PORTF_DATA_R = 0x00;
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STATUS_LED(UART1_READ());
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GPIO_PORTF_ICR_R = 0x01; // Clear interrupt flag for PF0
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}
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}
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int main(void) // MAIN FUNCTION
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{
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GPIO_PORT_F_init(); // GPIO INITIALISATION FUNCTION
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GPIO_PORT_B_init();
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systick_setting(); // SYSTICK SETUP
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while (1)
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{
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}
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}
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