/* USER CODE BEGIN Header */ /** ****************************************************************************** * @file : main.c * @brief : Main program body ****************************************************************************** * @attention * * Copyright (c) 2026 STMicroelectronics. * All rights reserved. * * This software is licensed under terms that can be found in the LICENSE file * in the root directory of this software component. * If no LICENSE file comes with this software, it is provided AS-IS. * ****************************************************************************** */ /* USER CODE END Header */ /* Includes ------------------------------------------------------------------*/ #include "main.h" #include "adc.h" #include "i2c.h" #include "usart.h" #include "gpio.h" /* Private includes ----------------------------------------------------------*/ /* USER CODE BEGIN Includes */ #include "ads1015_driver.h" #include "digital_outputs_driver.h" #include "ad5934_driver.h" #include "rs485_driver.h" #include "flash_manager.h" #include /* USER CODE END Includes */ /* Private typedef -----------------------------------------------------------*/ /* USER CODE BEGIN PTD */ /* USER CODE END PTD */ /* Private define ------------------------------------------------------------*/ /* USER CODE BEGIN PD */ #define AVG_SLOPE (4.3F) #define V_AT_25C (1.43F) #define V_REF_INT (1.2F) #define STM32_TEMPERATURE_AVERAGES 4 /* USER CODE END PD */ /* Private macro -------------------------------------------------------------*/ /* USER CODE BEGIN PM */ /* USER CODE END PM */ /* Private variables ---------------------------------------------------------*/ /* USER CODE BEGIN PV */ uint8_t rx_buffer[256]; /*!< Buffer for received data */ uint8_t tx_data[] = "Hello RS-485 Broadcast!"; /*!< Data to send */ uint8_t adc_text[6]; uint8_t real_text[6]; uint8_t imag_text[6]; uint8_t rs485_text[6]; uint8_t newline[]={'\n','\0'}; uint8_t doubleSpace[]={'_','_'}; uint8_t newline_ph[]={'_','p','H','\n','\0'}; uint8_t newline_admi[]={'_','u','S','\n','\0'}; uint8_t newline_temp[]={' ','°','C','\n','\0'}; uint8_t newline_imag[]={'_','O','h','m','\n','\0'}; uint8_t newline_485[]={'_','a','d','\n','\0'}; uint8_t minus[]={'-',' '}; uint8_t main_state = STATE_RUNNING_OK; uint8_t rs485_address=0; uint16_t AD_RES[2]; uint8_t UpdateEvent = 0; float Temperature, Temp_Sum, V_Sense, V_Ref; float Temp_Samples[STM32_TEMPERATURE_AVERAGES]={0}; /* USER CODE END PV */ /* Private function prototypes -----------------------------------------------*/ void SystemClock_Config(void); /* USER CODE BEGIN PFP */ void intToStr(int N, char *str); void FloatToString(char * buf, double val); /* USER CODE END PFP */ /* Private user code ---------------------------------------------------------*/ /* USER CODE BEGIN 0 */ /* USER CODE END 0 */ /** * @brief The application entry point. * @retval int */ int main(void) { /* USER CODE BEGIN 1 */ HAL_StatusTypeDef status0,status1; // Variables to store previous LED states uint8_t previous_green_state = 0; uint8_t previous_red_state = 0; // Variables for timing uint32_t previous_millis_green = 0; uint32_t previous_millis_red = 0; uint32_t current_millis; float temperature_RTD, admittance_EC, ph_compensated; /*! Temporary variables */ uint8_t tempString[10] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0}; uint8_t i; /* USER CODE END 1 */ /* MCU Configuration--------------------------------------------------------*/ /* Reset of all peripherals, Initializes the Flash interface and the Systick. */ HAL_Init(); /* USER CODE BEGIN Init */ /* USER CODE END Init */ /* Configure the system clock */ SystemClock_Config(); /* USER CODE BEGIN SysInit */ /* USER CODE END SysInit */ /* Initialize all configured peripherals */ MX_GPIO_Init(); MX_ADC1_Init(); MX_ADC2_Init(); MX_I2C1_Init(); MX_I2C2_Init(); MX_USART1_UART_Init(); /* USER CODE BEGIN 2 */ Flash_Load_Page(&flash_data); //TempSensor_Init(&hadc1); /* HAL_TIM_Base_Start(&htim3); HAL_ADCEx_Calibration_Start(&hadc1); HAL_ADC_Start_DMA(&hadc1, (uint32_t*)AD_RES, 2); // Internal Temperature conversion */ digital_outputs_init(); // Initialize RS-485 driver rs485_init(); ADS1015(&i2c, &hi2c1, ADS_ADDR_GND); ADSsetGain(&i2c, GAIN_SIXTEEN); // Start CE and RTD Measurement AD5934_Init(); /* USER CODE END 2 */ /* Infinite loop */ /* USER CODE BEGIN WHILE */ if(HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_3) == GPIO_PIN_RESET) // When PB3 (with internal pull up) in the Prog Header is set to GND { main_state = STATE_SETUP_CALIBRATION; HAL_GPIO_WritePin(GPIOB, GPIO_PIN_4, GPIO_PIN_SET); HAL_GPIO_WritePin(GPIOB, GPIO_PIN_5, GPIO_PIN_RESET); // Red LED On for(i=0;i<32;i++) // Loop to get stability and get averages { flash_data.ph4_volts = ADSCalculate_ph_Volts(); flash_data.temperature_value = AD5934_GetTemperature(); // Air Temperature is not stored, just used to calculate impedance flash_data.ec0_mag = AD5934_GetImpedance(flash_data.temperature_value); // Dry Probe if(HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_6) == GPIO_PIN_SET) flash_data.EC10mS_EC5mS_switch = AD5934_CH_EC_HIGH_GAIN; // 5mS/cm option else flash_data.EC10mS_EC5mS_switch = AD5934_CH_EC_MID_GAIN; //10ms/cm option if(HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_7) == GPIO_PIN_SET) flash_data.PT100_PT1000_switch = AD5934_CH_RTD_LOW_GAIN; //PT100 option else flash_data.PT100_PT1000_switch = AD5934_CH_RTD_MID_GAIN; //PT1000 option } while(HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_3) == GPIO_PIN_RESET); HAL_Delay(500); HAL_GPIO_WritePin(GPIOB, GPIO_PIN_4, GPIO_PIN_RESET); // Green LED On HAL_GPIO_WritePin(GPIOB, GPIO_PIN_5, GPIO_PIN_SET); for(i=0;i<32;i++) // Loop to get stability and get averages { flash_data.temperature_value = AD5934_GetTemperature(); // Liquid Temperature is stored flash_data.ph7_volts = ADSCalculate_ph_Volts(); flash_data.ec1413_mag = AD5934_GetImpedance(flash_data.temperature_value); // Get the impedance of the reference liquid Flash_Save_Page(&flash_data); // Store Calibration parameters in Flash } HAL_Delay(500); HAL_GPIO_WritePin(GPIOB, GPIO_PIN_4, GPIO_PIN_RESET); // Green LED On HAL_GPIO_WritePin(GPIOB, GPIO_PIN_5, GPIO_PIN_RESET); // Red LED On main_state = STATE_RUNNING_OK; } while (1) { current_millis = HAL_GetTick(); // Piscar LED verde em PB5 a cada 0,5 segundos if ((current_millis - previous_millis_green) >= 500) { previous_millis_green = current_millis; HAL_GPIO_TogglePin(GPIOB, GPIO_PIN_5); // Check if state changed and send via RS485 uint8_t current_green_state = HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_5); if (current_green_state != previous_green_state) { previous_green_state = current_green_state; uint8_t led_data[2] = {0x01, current_green_state}; // Command 0x01 for green LED } temperature_RTD = AD5934_GetTemperature(); FloatToString(tempString, temperature_RTD); status0 = rs485_send_broadcast(tempString, (strlen((char*)tempString)-1)); status1 = rs485_send_broadcast(newline_temp, strlen((char*)newline_temp)); admittance_EC = AD5934_GetImpedance(temperature_RTD); FloatToString(tempString, admittance_EC); status0 = rs485_send_broadcast(tempString, (strlen((char*)tempString)-1)); status1 = rs485_send_broadcast(newline_admi, strlen((char*)newline_admi)); } // Piscar LED vermelho em PB4 a cada 1 segundo if ((current_millis - previous_millis_red) >= 1000) { previous_millis_red = current_millis; HAL_GPIO_TogglePin(GPIOB, GPIO_PIN_4); // Check if state changed and send via RS485 uint8_t current_red_state = HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_4); if (current_red_state != previous_red_state) { previous_red_state = current_red_state; uint8_t led_data[2] = {0x02, current_red_state}; // Command 0x02 for red LED } ph_compensated = ADSCalculate_ph_Uncompensated(); FloatToString(tempString, ph_compensated); status0 = rs485_send_broadcast(tempString, (strlen((char*)tempString)-1)); status1 = rs485_send_broadcast(newline_ph, strlen((char*)newline_ph)); } /* if(UpdateEvent) // Internal Temperature { for (i = (STM32_TEMPERATURE_AVERAGES-1); i > 0; i--) Temp_Samples[i] = Temp_Samples[i-1]; // Read real and imaginary data if(AD_RES[0]>0.0f) V_Ref = (float)((V_REF_INT * 4095.0)/AD_RES[0]); else V_Ref = 0.0f; V_Sense = (float)(AD_RES[1] * V_Ref) / 4095.0; Temp_Samples[0] = (((V_AT_25C - V_Sense) * 1000.0) /AVG_SLOPE) + 25.0; for (i = 0, Temp_Sum=0; i < STM32_TEMPERATURE_AVERAGES; i++) Temp_Sum += Temp_Samples[i]; Temperature = Temp_Sum/((float)STM32_TEMPERATURE_AVERAGES); UpdateEvent = 0; } */ } /* USER CODE END WHILE */ /* USER CODE BEGIN 3 */ /* USER CODE END 3 */ } /** * @brief System Clock Configuration * @retval None */ void SystemClock_Config(void) { RCC_OscInitTypeDef RCC_OscInitStruct = {0}; RCC_ClkInitTypeDef RCC_ClkInitStruct = {0}; RCC_PeriphCLKInitTypeDef PeriphClkInit = {0}; /** Initializes the RCC Oscillators according to the specified parameters * in the RCC_OscInitTypeDef structure. */ RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE; RCC_OscInitStruct.HSEState = RCC_HSE_ON; RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) { Error_Handler(); } /** Initializes the CPU, AHB and APB buses clocks */ RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2; RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSE; RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1; RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1; RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1; if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK) { Error_Handler(); } PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_ADC; PeriphClkInit.AdcClockSelection = RCC_ADCPCLK2_DIV8; if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK) { Error_Handler(); } } /* USER CODE BEGIN 4 */ /***************************************************************************//** * @brief Converts a float value to a character array with 3 digits of accuracy. * * @param *buf - returns the converterd value * @param val - value to be converted * * @return None. *******************************************************************************/ void FloatToString(char *buf, double val) { char temp[20]; // Buffer auxiliar para construção segura int i = 0; // 1. Tratar sinal negativo if (val < 0) { temp[i++] = '-'; val = -val; } // 2. Separar parte inteira e fracionária long intPart = (long)val; // Multiplicamos por 1000 para obter 3 casas decimais fixas int fracPart = (int)((val - (double)intPart) * 1000.0 + 0.5); // 3. Converter a parte inteira para o buffer temp // Usamos um buffer temporário de inversão para não precisar de lógica complexa de ponteiro char intRev[12]; int j = 0; if (intPart == 0) { intRev[j++] = '0'; } else { while (intPart > 0) { intRev[j++] = (intPart % 10) + '0'; intPart /= 10; } } // Inverter a parte inteira de volta para o buffer principal for (int k = j - 1; k >= 0; k--) { temp[i++] = intRev[k]; } // 4. Adicionar o ponto decimal e a parte fracionária (sempre 3 casas) temp[i++] = '.'; // Garantir que a parte fracionária tenha sempre 3 dígitos (ex: .005 em vez de .5) int fracBuffer[3]; fracBuffer[2] = fracPart % 10; // Unidade fracBuffer[1] = (fracPart / 10) % 10; // Dezena fracBuffer[0] = (fracPart / 100) % 10; // Centena for (int k = 2; k >= 0; k--) { temp[i++] = fracBuffer[k] + '0'; } // 5. Finalizar a string com o caractere nulo temp[i] = '\0'; // 6. Copiar para o buffer de destino final (sem risco de lixo) int destIdx = 0; while (temp[destIdx] != '\0' && destIdx < 15) { // Limite de segurança buf[destIdx] = temp[destIdx]; destIdx++; } buf[destIdx] = '\0'; } void intToStr(int N, char *str) { int i = 0; // Save the copy of the number for sign int sign = N; // If the number is negative, make it positive if (N < 0) N = -N; // Extract digits from the number and add them to the // string while (N > 0) { // Convert integer digit to character and store // it in the str str[i++] = N % 10 + '0'; N /= 10; } // If the number was negative, add a minus sign to the // string if (sign < 0) { str[i++] = '-'; } // Null-terminate the string str[i] = '\0'; // Reverse the string to get the correct order for (int j = 0, k = i - 1; j < k; j++, k--) { char temp = str[j]; str[j] = str[k]; str[k] = temp; } } /* void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef* hadc) { UpdateEvent = 1; // Internal TEmperature } */ /* USER CODE END 4 */ /** * @brief This function is executed in case of error occurrence. * @retval None */ void Error_Handler(void) { /* USER CODE BEGIN Error_Handler_Debug */ /* User can add his own implementation to report the HAL error return state */ __disable_irq(); while (1) { } /* USER CODE END Error_Handler_Debug */ } #ifdef USE_FULL_ASSERT /** * @brief Reports the name of the source file and the source line number * where the assert_param error has occurred. * @param file: pointer to the source file name * @param line: assert_param error line source number * @retval None */ void assert_failed(uint8_t *file, uint32_t line) { /* USER CODE BEGIN 6 */ /* User can add his own implementation to report the file name and line number, ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */ /* USER CODE END 6 */ } #endif /* USE_FULL_ASSERT */