#include <stdint.
h>
#include <stdbool.h>
#include "inc/tm4c123gh6pm.h"
#include "inc/hw_memmap.h"
#include "inc/hw_types.h"
#include "driverlib/sysctl.h"
#include "driverlib/interrupt.h"
#include "driverlib/gpio.h"
#include "driverlib/pin_map.h"
#include "driverlib/systick.h"
#include "driverlib/uart.h"
// Function Prototypes
void UARTIntHandler(void);
// Global Variables
volatile int clock = 0;
int main() {
// Set system clock (50MHz from external 16MHz crystal)
SysCtlClockSet(SYSCTL_SYSDIV_4 | SYSCTL_USE_PLL | SYSCTL_XTAL_16MHZ |
SYSCTL_OSC_MAIN);
// Enable UART0 and GPIOA
SysCtlPeripheralEnable(SYSCTL_PERIPH_UART0);
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);
// Configure UART pins
GPIOPinConfigure(GPIO_PA0_U0RX);
GPIOPinConfigure(GPIO_PA1_U0TX);
GPIOPinTypeUART(GPIO_PORTA_BASE, GPIO_PIN_0 | GPIO_PIN_1);
// UART Configuration
UARTConfigSetExpClk(UART0_BASE, SysCtlClockGet(), 9600,
(UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_ONE |
UART_CONFIG_PAR_NONE));
// Enable UART interrupts
IntEnable(INT_UART0);
UARTIntEnable(UART0_BASE, UART_INT_RX | UART_INT_RT);
// Enable GPIOF for LED control
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOF);
GPIOPinTypeGPIOOutput(GPIO_PORTF_BASE, GPIO_PIN_2); // Blue LED (PF2)
// Turn off LED initially
GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_2, 0x00);
// Enable global interrupts
IntMasterEnable();
while (1) {
// Main loop does nothing; interrupts handle the tasks
}
}
// ------------------------ UART Interrupt Handler ------------------------
void UARTIntHandler(void) {
uint32_t status = UARTIntStatus(UART0_BASE, true); // Get interrupt status
UARTIntClear(UART0_BASE, status); // Clear handled interrupts
while (UARTCharsAvail(UART0_BASE)) { // Check if data is available
char c = UARTCharGetNonBlocking(UART0_BASE); // Read received character
// Echo received character back
UARTCharPutNonBlocking(UART0_BASE, c);
// Check if the received character is '1'
if (c == '1') {
// Toggle Blue LED (PF2)
uint8_t ledState = GPIOPinRead(GPIO_PORTF_BASE, GPIO_PIN_2);
if (ledState) {
GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_2, 0x00); // Turn LED OFF
} else {
GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_2, GPIO_PIN_2); // Turn LED
ON
}
}
}
}
