#include "stm32l0xx_hal.h"
#include <stdio.h>
#include <string.h>

/* Nesne Yapilari */
ADC_HandleTypeDef hadc1;
UART_HandleTypeDef huart2;

/* Degiskenler */
uint32_t sensor_value = 0;
char status_msg[20];

/* Fonksiyonlar */
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_ADC_Init(void);
static void MX_USART2_UART_Init(void);

/* printf'in terminale cikmasi icin mecburi */
int _write(int file, char *ptr, int len) {
    HAL_UART_Transmit(&huart2, (uint8_t*)ptr, len, HAL_MAX_DELAY);
    return len;
}

int main(void) {
    HAL_Init();
    SystemClock_Config();

    MX_GPIO_Init();
    MX_ADC_Init();
    MX_USART2_UART_Init();

    // Baslangic testi: LED'i 1 saniye yak söndür
    HAL_GPIO_WritePin(GPIOA, GPIO_PIN_5, GPIO_PIN_SET);
    HAL_Delay(1000);
    HAL_GPIO_WritePin(GPIOA, GPIO_PIN_5, GPIO_PIN_RESET);

    while (1) {
        /* 1. Sensor Oku */
        HAL_ADC_Start(&hadc1);
        if (HAL_ADC_PollForConversion(&hadc1, 10) == HAL_OK) {
            sensor_value = HAL_ADC_GetValue(&hadc1);
        }
        HAL_ADC_Stop(&hadc1);

        /* 2. Mantik Kontrolu */
        if (sensor_value < 1000) {
            strcpy(status_msg, "NORMAL");
            HAL_GPIO_WritePin(GPIOA, GPIO_PIN_5, GPIO_PIN_RESET); // LED SONUK
        } 
        else {
            strcpy(status_msg, "TEHLIKE");
            HAL_GPIO_WritePin(GPIOA, GPIO_PIN_5, GPIO_PIN_SET);   // LED YANIK
        }

        /* 3. Terminale Yaz */
        printf("ADC: %lu | Durum: %s \r\n", sensor_value, status_msg);

        HAL_Delay(200);
    }
}

/* --- AYARLAR (Wokwi Nucleo L031K6 Icin) --- */

static void MX_ADC_Init(void) {
    ADC_ChannelConfTypeDef sConfig = {0};
    hadc1.Instance = ADC1;
    hadc1.Init.Resolution = ADC_RESOLUTION_12B;
    HAL_ADC_Init(&hadc1);
    sConfig.Channel = ADC_CHANNEL_0; // A0 Pin
    sConfig.Rank = ADC_RANK_CHANNEL_NUMBER;
    HAL_ADC_ConfigChannel(&hadc1, &sConfig);
}

static void MX_USART2_UART_Init(void) {
    huart2.Instance = USART2;
    huart2.Init.BaudRate = 115200;
    huart2.Init.WordLength = UART_WORDLENGTH_8B;
    huart2.Init.StopBits = UART_STOPBITS_1;
    huart2.Init.Parity = UART_PARITY_NONE;
    huart2.Init.Mode = UART_MODE_TX_RX;
    HAL_UART_Init(&huart2);
}

static void MX_GPIO_Init(void) {
    GPIO_InitTypeDef GPIO_InitStruct = {0};
    __HAL_RCC_GPIOA_CLK_ENABLE();
    // D13 Pini STM32'de PA5'e denk gelir
    GPIO_InitStruct.Pin = GPIO_PIN_5;
    GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
}

void SystemClock_Config(void) {}