feat(temperature):implement header file

-add function TEMPERATURE_Init()
-add function TEMPERATURE_Read()

temperature/temperature.c

@@ -0,0 +1,59 @@
+/*
+ @module: TEMPERATURE
+ @author: Abdullah Bagyapan
+ @date:   19/04/2024
+*/
+
+/*================================== Libraries ==================================*/
+
+
+#include "temperature.h"
+
+#include "pico/stdlib.h"
+#include "hardware/adc.h"
+
+
+/*================================== Functions ==================================*/
+
+
+/*
+ @brief:  Calculate ADC value according to the formula
+
+ @author  Abdullah Bagyapan
+
+ @date    19/04/2024
+
+ @param   uint16_t ui16ADC_voltage, The analog data from temperature sensor
+
+ @return  The temperature, in celsius format
+*/
+static inline uint8_t _TEMPERATURE_Calculate_Celsius(uint16_t ui16ADC_voltage) {
+
+    // T = 27 - (ADC_voltage - 0.706)/0.001721
+    // The given above formula according to the RP2040 datasheet
+
+    return 27 - (ui16ADC_voltage - 0.706) / 0.001721;
+
+}
+
+
+void TEMPERATURE_Init(void) {
+
+    // Initialize onboard temperature sensor
+    adc_gpio_init(TEMPERATURE_GPIO_PIN);
+
+    // Set onboard temperature sensor as ADC
+    adc_select_input(TEMPERATURE_ADC_PIN);
+
+}
+
+uint8_t TEMPERATURE_Read(void) {
+
+    uint8_t ui8TemperatureCelsius;
+
+    uint16_t ui16ADC_voltage = adc_read();
+
+    ui8TemperatureCelsius = _TEMPERATURE_Calculate_Celsius(ui16ADC_voltage);
+
+    return ui8TemperatureCelsius;
+}