94 lines
3.2 KiB
C
94 lines
3.2 KiB
C
#include <stdint.h>
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#include <stdbool.h>
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#include "tm4c123gh6pm.h"
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#define MAX_FIELD_SIZE 100
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volatile char nmea_sentence[MAX_FIELD_SIZE];
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volatile uint8_t nmea_index = 0;
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volatile bool nmea_ready = false;
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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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}
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void GPIO_PORT_B_init(void)
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{
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SYSCTL_RCGCGPIO_R |= 0x02; // ENABLE CLOCK FOR GPIOB
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SYSCTL_RCGCUART_R |= 0x02; // ENABLE CLOCK FOR UART1
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GPIO_PORTB_DEN_R |= 0x03; // DIGITAL ENABLE FOR PB0 AND PB1
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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 = 0x60; // 8-bit, No 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 TX0
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UART1_IM_R |= 0x10;
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NVIC_EN0_R |= (1 << 6);
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}
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// Control LEDs based on speed
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void control_leds_based_on_speed(float speed_kmh) {
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// Clear all LED bits (assuming LEDs are connected to bits 1, 2, and 3)
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GPIO_PORTF_DATA_R &= 0x00;
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// Determine which 5 km/h range the speed falls into
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if (speed_kmh >= 0.0 && speed_kmh < 10.0) {
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// Range 0-10 km/h
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GPIO_PORTF_DATA_R |= 0x08; // Red LED
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} else if (speed_kmh >= 10.0 && speed_kmh < 20.0) {
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// Range 10-20 km/h
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GPIO_PORTF_DATA_R |= 0x0C; // Blue LED
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} else if (speed_kmh >= 20.0 && speed_kmh < 30.0) {
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// Range 20-30 km/h
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GPIO_PORTF_DATA_R |= 0x04; // Green LED
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} else if (speed_kmh >= 30.0 && speed_kmh < 40.0) {
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// Range 30-40 km/h
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GPIO_PORTF_DATA_R |= 0x06; // Yellow LED (Red + Green)
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} else if (speed_kmh >= 40.0 && speed_kmh < 50.0) {
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// Range 40-50 km/h
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GPIO_PORTF_DATA_R |= 0x02; // Blue LED
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} else {
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// Above 50 km/h
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GPIO_PORTF_DATA_R |= 0x0E; // Maximum LED (Red + Blue + Green)
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}
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}
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void UART1_Handler(void)
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{
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char data = UART1_DR_R & 0xFF;
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if (data == '\n' || data == '\r')
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{
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nmea_sentence[nmea_index] = '\0';
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if (strncmp((const char *)nmea_sentence, "$GPRMC", 6) == 0)
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{
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nmea_ready = true;
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}
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nmea_index = 0;
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}
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else if (nmea_index < MAX_FIELD_SIZE - 1)
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{
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nmea_sentence[nmea_index++] = data;
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}
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}
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