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added 7 seg display and buttons handling
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lines changed

‎.cproject

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@@ -25,8 +25,8 @@
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<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.target_board.1225673681" name="Board" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.target_board" useByScannerDiscovery="false" value="NUCLEO-F446RE" valueType="string"/>
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<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.defaults.1869189307" name="Defaults" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.defaults" useByScannerDiscovery="false" value="com.st.stm32cube.ide.common.services.build.inputs.revA.1.0.6 || Debug || true || Executable || com.st.stm32cube.ide.mcu.gnu.managedbuild.option.toolchain.value.workspace || NUCLEO-F446RE || 0 || 0 || arm-none-eabi- || ${gnu_tools_for_stm32_compiler_path} || ../Core/Inc | ../Drivers/STM32F4xx_HAL_Driver/Inc | ../Drivers/STM32F4xx_HAL_Driver/Inc/Legacy | ../Drivers/CMSIS/Device/ST/STM32F4xx/Include | ../Drivers/CMSIS/Include || || || USE_HAL_DRIVER | STM32F446xx || || Drivers | Core/Startup | Core || || || ${workspace_loc:/${ProjName}/STM32F446RETX_FLASH.ld} || true || NonSecure || || secure_nsclib.o || || None || || || " valueType="string"/>
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<option id="com.st.stm32cube.ide.mcu.debug.option.cpuclock.1143402383" name="Cpu clock frequence" superClass="com.st.stm32cube.ide.mcu.debug.option.cpuclock" useByScannerDiscovery="false" value="84" valueType="string"/>
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<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.nanoscanffloat.546233456" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.nanoscanffloat" value="true" valueType="boolean"/>
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<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.nanoprintffloat.455380597" name="Use float with printf from newlib-nano (-u _printf_float)" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.nanoprintffloat" useByScannerDiscovery="false" value="true" valueType="boolean"/>
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<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.nanoscanffloat.546233456" name="Use float with scanf from newlib-nano (-u _scanf_float)" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.nanoscanffloat" useByScannerDiscovery="false" value="true" valueType="boolean"/>
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<targetPlatform archList="all" binaryParser="org.eclipse.cdt.core.ELF" id="com.st.stm32cube.ide.mcu.gnu.managedbuild.targetplatform.204779960" isAbstract="false" osList="all" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.targetplatform"/>
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<builder buildPath="${workspace_loc:/hum_temp_sensor}/Debug" id="com.st.stm32cube.ide.mcu.gnu.managedbuild.builder.222754992" keepEnvironmentInBuildfile="false" managedBuildOn="true" name="Gnu Make Builder" parallelBuildOn="true" parallelizationNumber="optimal" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.builder"/>
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<tool id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.assembler.779404786" name="MCU/MPU GCC Assembler" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.assembler">

‎.mxproject

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‎.project

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<?xml version="1.0" encoding="UTF-8"?>
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<projectDescription>
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<name>hum_temp_sensor</name>
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<name>digital_thermometer</name>
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<comment></comment>
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<projects>
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</projects>

‎Core/Inc/aht20.h

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/*
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* aht20_driver_stm32f446ret
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* driver for aht20 temperature and humidity sensor
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* digital_thermomether
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* digital thermometer built using stm32f446ret, AHT20 sensor and multi-function shield
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* Copyright (C) 2025 Andrew Kushyk
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*
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* This program is free software: you can redistribute it and/or modify

‎Core/Inc/aht20_api.h

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/*
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* aht20_driver_stm32f446ret
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* driver for aht20 temperature and humidity sensor
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* digital_thermomether
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* digital thermometer built using stm32f446ret, AHT20 sensor and multi-function shield
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* Copyright (C) 2025 Andrew Kushyk
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*
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* This program is free software: you can redistribute it and/or modify

‎Core/Inc/bl.h renamed to ‎Core/Inc/business_logic.h

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/*
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* aht20_driver_stm32f446ret
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* driver for aht20 temperature and humidity sensor
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* Copyright (C) 2025 Andrew Kushyk
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* digital_thermomether
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* digital thermometer built using stm32f446ret, AHT20 sensor and multi-function shield
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* Copyright (C) 2025 Andrew Kushyk, Andrii Ostapchuk
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published
@@ -27,17 +27,27 @@ typedef enum {
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BL_STATUS_RUN_FAILED,
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} bl_status_t;
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/*
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* initializes buttons
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*/
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bl_status_t bl_init_buttons(void);
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/*
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* runs calibration check. if wasn't calibrated, calibrates the sensor
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*/
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bl_status_t bl_run_sensor(I2C_HandleTypeDef *hi2c, UART_HandleTypeDef *huart);
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bl_status_t bl_run_sensor(I2C_HandleTypeDef *hi2c);
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/*
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* processes and calculates sensor data
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*/
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bl_status_t bl_process_sensor_data(I2C_HandleTypeDef *hi2c, UART_HandleTypeDef *huart);
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bl_status_t bl_process_sensor_data(I2C_HandleTypeDef *hi2c);
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/*
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* transmits formatted data to display via SPI
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*/
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void bl_spi_transmit_sensor_data(void);
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/*
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* transmits formatted data to UART
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* interrupt callback
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*/
43-
void bl_uart_transmit_sensor_data(UART_HandleTypeDef *huart);
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void HAL_GPIO_EXTI_Callback(uint16_t gpio_pin);

‎Core/Inc/button_hmi_api.h

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/*
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* digital_thermomether
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* digital thermometer built using stm32f446ret, AHT20 sensor and multi-function shield
4+
* Copyright (C) 2025 Andrew Kushyk, Eldar Vanin
5+
*
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* This program is free software: you can redistribute it and/or modify
7+
* it under the terms of the GNU Affero General Public License as published
8+
* by the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
12+
* but WITHOUT ANY WARRANTY; without even the implied warranty of
13+
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14+
* GNU Affero General Public License for more details.
15+
*
16+
* You should have received a copy of the GNU Affero General Public License
17+
* along with this program. If not, see <https://www.gnu.org/licenses/>.
18+
*/
19+
20+
#pragma once
21+
22+
#include "general_hmi_device_api.h"
23+
#include "buttons.h"
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25+
/**
26+
* @brief HMI device handler for button devices
27+
*
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* This structure uses hmi_device_handler_t interface
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* to define functions to initialize and interact with
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* button device
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*
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* - `b_hmi_init` - Initializes the button GPIO
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* - `b_hmi_check_button_state_change` - Checks button state on button state change
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* - `b_hmi_check_button_current_state` - Get current button state
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* - `read_button` - Handles GPIO interrupt triggered by button
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*
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* These functions are static and decribed in button_hmi_api.c file
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*
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* @see hmi_device_handler_t
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*/
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extern hmi_device_handler_t button_hmi_api;

‎Core/Inc/buttons.h

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/*
2+
* digital_thermomether
3+
* digital thermometer built using stm32f446ret, AHT20 sensor and multi-function shield
4+
* Copyright (C) 2025 Andrew Kushyk, Eldar Vanin
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*
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* This program is free software: you can redistribute it and/or modify
7+
* it under the terms of the GNU Affero General Public License as published
8+
* by the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
18+
*/
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20+
#pragma once
21+
#include "main.h"
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// @brief Status codes for button press
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typedef enum {
25+
BUTTON_RELEASED = 0, /// Button released status
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BUTTON_SHORT_PRESS, /// Button short pressed status
27+
} Button_State;
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29+
// @brief GPIO port and pin for button
30+
typedef struct {
31+
GPIO_TypeDef* port; /// GPIO port
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uint16_t pin; /// GPIO pin
33+
} Button_Gpio;
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// @brief Grouped button data
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typedef struct Button {
37+
uint32_t press_time; /// Last button press time
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uint32_t release_time; /// Last button release time
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Button_State button_state; /// Last saved button state
40+
GPIO_PinState last_gpio_state; /// Last saved pin state
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Button_Gpio gpio; /// Button GPIO
42+
volatile struct Button *next_button; /// Pointer to next button in linked list
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} Button;
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45+
/**
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* @brief Initializes button and adds it to linked list
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*
48+
* @param[out] button button to be initialized
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*
50+
* @param[in] gpio_pin GPIO pin that caused interrupt
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*
52+
* @param gpio_pin GPIO pin button connected to
53+
*/
54+
void button_init(volatile Button *button, GPIO_TypeDef* gpio_port, uint16_t gpio_pin);
55+
56+
/**
57+
* @brief Checks button and returns detected button state
58+
*
59+
* @param[in]button is a button to check
60+
*
61+
* @return detected button state
62+
*/
63+
Button_State check_button_state(volatile Button *button);
64+
65+
/**
66+
* @brief detect button GPIO state change using debouncing and save time when button pressed
67+
*
68+
* @param gpio_pin is a pin that caused interrupt
69+
*/
70+
void read_button(uint16_t gpio_pin);

‎Core/Inc/character_generator.h

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/*
2+
* digital_thermomether
3+
* digital thermometer built using stm32f446ret, AHT20 sensor and multi-function shield
4+
* Copyright (C) 2025 Andrew Kushyk
5+
*
6+
* This program is free software: you can redistribute it and/or modify
7+
* it under the terms of the GNU Affero General Public License as published
8+
* by the Free Software Foundation, either version 3 of the License, or
9+
* (at your option) any later version.
10+
*
11+
* This program is distributed in the hope that it will be useful,
12+
* but WITHOUT ANY WARRANTY; without even the implied warranty of
13+
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14+
* GNU Affero General Public License for more details.
15+
*
16+
* You should have received a copy of the GNU Affero General Public License
17+
* along with this program. If not, see <https://www.gnu.org/licenses/>.
18+
*/
19+
20+
21+
/**
22+
* @file character_generator.h
23+
* @brief Declares the character generator module for 7-segment displays.
24+
*
25+
* This header provides the interface for initializing and controlling a 7-segment display.
26+
* It declares functions to initialize the module and transmit character data, using the API
27+
* defined in character_generator_api.h. The module converts ASCII characters to 7-segment
28+
* codes and manages decimal point and brightness settings for display output.
29+
*/
30+
31+
/**
32+
* @addtogroup Character_Generator
33+
* @{
34+
*/
35+
36+
#pragma once
37+
#include "character_generator_api.h"
38+
39+
/**
40+
* @brief Extern declaration of the character generator API structure.
41+
*
42+
* Provides access to the module's function pointers for initialization and data transmission.
43+
* This variable is defined in character_generator.c and should be used to call the module's
44+
* functions from the application code.
45+
*/
46+
extern const char_gen_api_t api_char_gen;
47+
48+
/**
49+
* @brief Initializes the character generator module.
50+
*
51+
* Configures the 7-segment driver with the provided SPI, timer, and GPIO settings for communication
52+
* with the display hardware.
53+
*
54+
* @param[in] hspi Pointer to the SPI handle for communication with the display.
55+
* @param[in] htim Pointer to the timer handle for timing/control signals.
56+
* @param[in] GPIOx Pointer to the GPIO port for the latch/control signal.
57+
* @param[in] GPIO_Pin The GPIO pin number for the latch/control signal.
58+
* @return char_generator_status_t Status of initialization:
59+
* - CHAR_GEN_STATUS_OK: Initialization successful.
60+
* - CHAR_GEN_STATUS_NOT_INITIALIZED: Driver initialization failed.
61+
* @pre The driver API (`api_7_seg`) must be properly configured.
62+
* @note Must be called before any transmit operations.
63+
* @see char_gen_transmit
64+
*/
65+
char_generator_status_t char_gen_init(SPI_HandleTypeDef *const hspi, TIM_HandleTypeDef *const htim,
66+
GPIO_TypeDef *const GPIOx, const uint16_t GPIO_Pin);
67+
68+
/**
69+
* @brief Transmits a 4-digit configuration to the 7-segment display.
70+
*
71+
* Converts ASCII characters and period statuses from the configuration into 16-bit data for the
72+
* 7-segment display, where the upper 8 bits contain segment data (including decimal point) and
73+
* the lower 8 bits select the digit position (bit index set to 1). The data is sent via the driver API.
74+
*
75+
* @param[in] config Pointer to the configuration containing 4 digits and brightness setting.
76+
* @return char_generator_status_t Status of transmission:
77+
* - CHAR_GEN_STATUS_OK: Transmission successful.
78+
* - CHAR_GEN_STATUS_INVALID_PARAMETERS: `config` is NULL or contains invalid characters.
79+
* - CHAR_GEN_STATUS_NOT_TRANSMITTED: Driver failed to send data.
80+
* @pre char_gen_init must be called successfully prior to transmission.
81+
* @note Supported characters: '0'-'9', 'A', 'a', 'T', 't', 'P', 'p', '-'.
82+
* @note The `config->digits` array must contain exactly 4 elements.
83+
* @note The `config->periods` array must contain valid `period_status` values (PERIOD_ON or PERIOD_OFF).
84+
* @see char_gen_init
85+
*/
86+
char_generator_status_t char_gen_transmit(const char_gen_data_t *const config);
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88+
/** @} */ // end of Character_Generator

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