From b5e4501940de47a79fe73fbaa26e55e98db816d7 Mon Sep 17 00:00:00 2001 From: Sanyog Date: Thu, 10 Oct 2024 20:27:33 +0530 Subject: [PATCH] Add comments --- main.c | 97 ++++++++++++++++++++++++++-------------------------------- 1 file changed, 44 insertions(+), 53 deletions(-) diff --git a/main.c b/main.c index 3f156b4..5eb972c 100644 --- a/main.c +++ b/main.c @@ -12,122 +12,113 @@ void GPIO_PORT_F_init(void) GPIO_PORTF_PUR_R = 0x11; // PORTF PF0 and PF4 IS PULLED UP 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_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 + GPIO_PORTF_IM_R |= 0x11; // Unmask interrupts for PF0 and PF4 } void GPIO_PORT_B_init(void) { - SYSCTL_RCGCGPIO_R |= 0x02; // Enable clock to GPIOB - SYSCTL_RCGCUART_R |= 0x02; // Enable UART1 clock + SYSCTL_RCGCGPIO_R |= 0x02; // Enable clock to GPIOB + SYSCTL_RCGCUART_R |= 0x02; // Enable UART1 clock - GPIO_PORTB_DEN_R |= 0x03; // Enable PB0, PB1 as digital - GPIO_PORTB_AFSEL_R |= 0x03; // Enable alternate function on PB0, PB1 + GPIO_PORTB_DEN_R |= 0x03; // Enable PB0, PB1 as digital + GPIO_PORTB_AFSEL_R |= 0x03; // Enable alternate function on PB0, PB1 - GPIO_PORTB_PCTL_R = (GPIO_PORTB_PCTL_R & 0xFFFFFF00) | 0x00000011; // Set PB0, PB1 for UART + GPIO_PORTB_PCTL_R = (GPIO_PORTB_PCTL_R & 0xFFFFFF00) | 0x00000011; // Set PB0, PB1 for UART - UART1_CTL_R &= ~0x01; // Disable UART1 during setup - UART1_IBRD_R = 104; // Set integer part of baud rate (for 9600 baud at 16 MHz clock) - UART1_FBRD_R = 11; // Set fractional part of baud rate - UART1_LCRH_R = 0x62; // 8-bit, odd parity, 1 stop bit - UART1_CC_R = 0x00; // Use system clock + UART1_CTL_R &= ~0x01; // Disable UART1 during setup + UART1_IBRD_R = 104; // Set integer part of baud rate (for 9600 baud at 16 MHz clock) + UART1_FBRD_R = 11; // Set fractional part of baud rate + UART1_LCRH_R = 0x62; // 8-bit, odd parity, 1 stop bit + UART1_CC_R = 0x00; // Use system clock - UART1_CTL_R |= 0x301; // Enable UART1, RX, and TX + UART1_CTL_R |= 0x301; // Enable UART1, RX, and TX } void UART1_WRITE(char data) { - while (UART1_FR_R & 0x20); // Wait until TX FIFO is not full - UART1_DR_R = data; // Write data to UART data register + while (UART1_FR_R & 0x20); // Wait until TX FIFO is not full + UART1_DR_R = data; // Write data to UART data register } char UART1_READ(void) { - while (UART1_FR_R & 0x10); // Wait until RX FIFO is not empty - return (char)UART1_DR_R; // Return received data + while (UART1_FR_R & 0x10); // Wait until RX FIFO is not empty + return (char)UART1_DR_R; // Return received data } #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 +#define CLOCK_HZ 16000000 // CLOCK FREQUENCY #define SYSTICK_RELOAD_VALUE(us) ((CLOCK_HZ / 1000000) * (us) - 1) // SYSTICK RELOAD VALUE -void systick_setting(void) // SYSTICK SETUP FUNCTION + +void systick_setting(void) // SYSTICK SETUP FUNCTION { - STRELOAD = SYSTICK_RELOAD_VALUE(1000); // RELOAD VALUE FOR 1ms - STCTRL |= (1 << 0) | (1 << 2); // Enable SysTick with system clock - STCURRENT = 0; // Clear current value + STRELOAD = SYSTICK_RELOAD_VALUE(1000); // RELOAD VALUE FOR 1ms + STCTRL |= (1 << 0) | (1 << 2); // Enable SysTick with system clock + STCURRENT = 0; // Clear current value } -void delay(int us) //DEFINING DELAY FUNCTION +void delay(int us) // DEFINING DELAY FUNCTION { - 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 + 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 STATUS_LED(char received_data) { if (received_data == 0xAA) { - GPIO_PORTF_DATA_R |= 0x08; // Turn on Green LED (PF3) - GPIO_PORTF_DATA_R &= ~0x04; // Turn off Blue LED (PF2) - + GPIO_PORTF_DATA_R |= 0x08; // Turn on Green LED (PF3) + GPIO_PORTF_DATA_R &= ~0x04; // Turn off Blue LED (PF2) } else if (received_data == 0xF0) { - GPIO_PORTF_DATA_R |= 0x04; // Turn on Blue LED (PF2) - GPIO_PORTF_DATA_R &= ~0x08; // Turn off Green LED (PF3) + GPIO_PORTF_DATA_R |= 0x04; // Turn on Blue LED (PF2) + GPIO_PORTF_DATA_R &= ~0x08; // Turn off Green LED (PF3) } else { GPIO_PORTF_DATA_R |= 0x02; } - //delay(500000); - //GPIO_PORTF_DATA_R &= 0x00; // Turn on Green LED (PF3) } -void GPIOF_interruptHandler(void) // Interrupt handler for GPIO Port F +void GPIOF_interruptHandler(void) // Interrupt handler for GPIO Port F { - //delay(200000); // Debounce delay - // Check PF4 (Switch 2) - if (GPIO_PORTF_RIS_R & 0x10) // Check if PF4 caused the interrupt + if (GPIO_PORTF_RIS_R & 0x10) // Check if PF4 caused the interrupt { - //GPIO_PORTF_DATA_R |= 0x02; // Toggle RED LED (PF1) - //delay(500000); UART1_WRITE(0xF0); STATUS_LED(UART1_READ()); - //GPIO_PORTF_DATA_R = 0x00; // Toggle RED LED (PF1) - GPIO_PORTF_ICR_R = 0x10; // Clear interrupt flag for PF4 + GPIO_PORTF_ICR_R = 0x10; // Clear interrupt flag for PF4 } - // Check PF0 (Switch 1) - if (GPIO_PORTF_RIS_R & 0x01) // Check if PF0 caused the interrupt + if (GPIO_PORTF_RIS_R & 0x01) // Check if PF0 caused the interrupt { - //GPIO_PORTF_DATA_R |= 0x04; // Toggle RED LED (PF1) - //delay(500000); UART1_WRITE(0xAA); - //GPIO_PORTF_DATA_R = 0x00; STATUS_LED(UART1_READ()); - GPIO_PORTF_ICR_R = 0x01; // Clear interrupt flag for PF0 + GPIO_PORTF_ICR_R = 0x01; // Clear interrupt flag for PF0 } } -int main(void) // MAIN FUNCTION + + +int main(void) // MAIN FUNCTION { - GPIO_PORT_F_init(); // GPIO INITIALISATION FUNCTION + GPIO_PORT_F_init(); // GPIO INITIALISATION FUNCTION GPIO_PORT_B_init(); - systick_setting(); // SYSTICK SETUP + systick_setting(); // SYSTICK SETUP while (1) { STATUS_LED(UART1_READ());