main.c

/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file           : main.c
  * @brief          : Main program body
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; Copyright (c) 2020 STMicroelectronics.
  * All rights reserved.</center></h2>
  *
  * This software component is licensed by ST under BSD 3-Clause license,
  * the "License"; You may not use this file except in compliance with the
  * License. You may obtain a copy of the License at:
  *                        opensource.org/licenses/BSD-3-Clause
  *
  ******************************************************************************
  */
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include "stdio.h"
#include "math.h"
/* USER CODE END Includes */

/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */

/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD */

/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */

/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/
TIM_HandleTypeDef htim1;

UART_HandleTypeDef huart1;

/* USER CODE BEGIN PV */

/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_TIM1_Init(void);
static void MX_USART1_UART_Init(void);
/* USER CODE BEGIN PFP */

/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
static uint8_t GAIN;	//Gain for clock cycles.


void delay_us (uint16_t us) //delay function
{
__HAL_TIM_SET_COUNTER(&htim1,0);  // setting the delay counter to 0.
while (__HAL_TIM_GET_COUNTER(&htim1) < us);  // while loop till the counter reaches the delay given (us).
}

void hx711_powerUp(void) //Power up function 
{
	HAL_GPIO_WritePin(GPIOA, GPIO_PIN_4, GPIO_PIN_RESET); //writing to the pin and setting it to 0.
}
void hx711_setGain(uint8_t gain)  //the values should be 32, 64 or 128
{
	if(gain < 64) GAIN = 2; //32, channel B
	else if(gain < 128) GAIN = 3; //64, channel A
	else GAIN = 1; //128, channel A
}


void hx711_init(void) //initializes the hx711 module by calling 2 functions. 
{ 	
  hx711_setGain(128); //setting gain to 128, as this was our best result after trying with other gains.
	hx711_powerUp(); //power up the hx711 module.
} 



int32_t hx711_get_value(void) //getting the weight from the module.
{
	uint32_t data = 0; //the data (weight) is firstly set to 0.
	uint8_t dout; // this is to show whether at this bit, if theres a number that should be recorded. 
	int32_t filler; //to fill the rest of the 32 bits.
	int32_t ret_value; //final value to return after adding the filling and the data together.
	
	for (uint8_t i = 0; i < 24; i++) //read 24 bit data + set gain and start next conversion
	{ 
		
		HAL_GPIO_WritePin(GPIOA, GPIO_PIN_4, GPIO_PIN_SET); //set the clock pin to 1.
		delay_us(1); //delay
			dout = HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_3); //read from the dout pin in variable dout.
			data = data << 1; //shift the data by 1 to make sure we are in correct position depending on the counter.
			if (dout) //if this bit has an output (value of 1) .
			{
				data++; //it sets the data value at this position as 1 as well.
			}
		HAL_GPIO_WritePin(GPIOA, GPIO_PIN_4, GPIO_PIN_RESET); //set clock pin to 0.
		delay_us(1); //delay
	}
	
	for( int i = 0; i < GAIN; i ++ ) //this for loop is for the gain, to add more clock cycles based on the gain.
	{
		HAL_GPIO_WritePin(GPIOA, GPIO_PIN_4, GPIO_PIN_SET); //set clock pin to 1.
		delay_us(1); //delay
		HAL_GPIO_WritePin(GPIOA, GPIO_PIN_4, GPIO_PIN_RESET); //set clock pin to 0.
		delay_us(1); //delay, here we are making a clock cycle.
	}
	
	if( data & 0x800000 ) //here we are checking if theres values in the 24 bits by anding.
		filler = 0xFF000000; //if there are values we add 1's to the last 8 bits which are needed as this is a 32-bit adc. 
	else
		filler = 0x00000000; //however, if nothing is in the data we just add 0's.
	
	ret_value = filler + data; //the return value is the addition of the data with the filler to have the 32-bits.
	return ret_value; //returning the value to be printed.
}

uint8_t hx711_is_ready(void) //making sure that the HX711 module is ready 
{
	return HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_3) == GPIO_PIN_RESET; //reading a value from it, the reseting it.
}

//void UART0Tx(char c) //function to use UART0 to transmit the weight to mobile application.
//{
// /* send a character to UART0 */
 //while((UART0->FR & 0x20)!= 0){} // Wait until Tx buffer is not full
 //UART0->DR = c; 								 // Write byte
// }

//void UART1_Handler(void) //handling the UART1 for data transmission.
//{
///* handle a receive interrupt and pass to UART0 and LEDs */
//	volatile int readback;
// char c;
// if (UART1->MIS & 0x0010) /* if a receive interrupt has occurred */
// {
// c = UART1->DR; /* read the received data */
// UART0Tx(c);
//	 
///* shift left and write it to LEDs */
//	 if (c == 'r') 
//		 GPIOF->DATA = 1 << 1;
//	 else if (c == 'b')
//		 GPIOF->DATA = 1 << 2;
//	 else if (c == 'g')
//		 GPIOF->DATA = 1 << 3;

// UART1->ICR = 0x0010; /* clear Rx interrupt flag */
// readback = UART1->ICR; /* a read to force clearing of interrupt flag */
// }
// else
// {
// /* should not get here. But if it does, */
// UART1->ICR = UART1->MIS; /* clear all interrupt flags */
// readback = UART1->ICR; /* a read to force clearing of interrupt flag */
// }
//}

/* USER CODE END 0 */

/**
  * @brief  The application entry point.
  * @retval int
  */
int main(void)
{
//  /* USER CODE BEGIN 1 */
///* provide clock to UART0 */
//	 SYSCTL->RCGCUART |= 1;
//	
///* enable clock to PORTA */
//	SYSCTL->RCGCGPIO |= 1;
//	
///* provide clock to UART1 */
//	SYSCTL->RCGCUART |= 0x02;
//	
///* enable clock to PORTB */
//	SYSCTL->RCGCGPIO |= 0x02;
//	
///* enable clock to PORTF */
//	 SYSCTL->RCGCGPIO |= 0x20;
//	
///* UART0 initialization */
//	UART0->CTL = 0; /* disable UART0 */
  /* 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_TIM1_Init();
  MX_USART1_UART_Init();
  /* USER CODE BEGIN 2 */
HAL_TIM_Base_Start(&htim1);

printf("Project start.\n"); //this is a message to show that our project started.
  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
int32_t hx711_value; 

hx711_init(); //calling the initialize function.

  while (1) //infinte loop
  {
if( hx711_is_ready()) //if the HX711 module is ready.
{

hx711_value = hx711_get_value(); //we store the value coming from the get value function.
printf("Weight: %d g \n\r", (((hx711_value)/1000)+263)); //printing the weight after we calibrated it manually.
}
else 
	printf("Error: HX711 Got disconnected, Check connections\n\r"); //However, if the HX711 module dosent read any value, this means there is a connection error.

    HAL_Delay(1000); //creating a delay.
    /* 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_HSI;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
  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_HSI;
  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_USART1|RCC_PERIPHCLK_TIM1;
  PeriphClkInit.Usart1ClockSelection = RCC_USART1CLKSOURCE_HSI;
  PeriphClkInit.Tim1ClockSelection = RCC_TIM1CLK_HCLK;
  if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
  {
    Error_Handler();
  }
}

/**
  * @brief TIM1 Initialization Function
  * @param None
  * @retval None
  */
static void MX_TIM1_Init(void)
{

  /* USER CODE BEGIN TIM1_Init 0 */

  /* USER CODE END TIM1_Init 0 */

  TIM_ClockConfigTypeDef sClockSourceConfig = {0};
  TIM_MasterConfigTypeDef sMasterConfig = {0};

  /* USER CODE BEGIN TIM1_Init 1 */

  /* USER CODE END TIM1_Init 1 */
  htim1.Instance = TIM1;
  htim1.Init.Prescaler = 7;
  htim1.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim1.Init.Period = 65535;
  htim1.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
  htim1.Init.RepetitionCounter = 0;
  htim1.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
  if (HAL_TIM_Base_Init(&htim1) != HAL_OK)
  {
    Error_Handler();
  }
  sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
  if (HAL_TIM_ConfigClockSource(&htim1, &sClockSourceConfig) != HAL_OK)
  {
    Error_Handler();
  }
  sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
  sMasterConfig.MasterOutputTrigger2 = TIM_TRGO2_RESET;
  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
  if (HAL_TIMEx_MasterConfigSynchronization(&htim1, &sMasterConfig) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN TIM1_Init 2 */

  /* USER CODE END TIM1_Init 2 */

}

/**
  * @brief USART1 Initialization Function
  * @param None
  * @retval None
  */
static void MX_USART1_UART_Init(void)
{

  /* USER CODE BEGIN USART1_Init 0 */

  /* USER CODE END USART1_Init 0 */

  /* USER CODE BEGIN USART1_Init 1 */

  /* USER CODE END USART1_Init 1 */
  huart1.Instance = USART1;
  huart1.Init.BaudRate = 9600;
  huart1.Init.WordLength = UART_WORDLENGTH_8B;
  huart1.Init.StopBits = UART_STOPBITS_1;
  huart1.Init.Parity = UART_PARITY_NONE;
  huart1.Init.Mode = UART_MODE_TX_RX;
  huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  huart1.Init.OverSampling = UART_OVERSAMPLING_16;
  huart1.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
  huart1.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
  if (HAL_UART_Init(&huart1) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN USART1_Init 2 */

  /* USER CODE END USART1_Init 2 */

}

/**
  * @brief GPIO Initialization Function
  * @param None
  * @retval None
  */
static void MX_GPIO_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};

  /* GPIO Ports Clock Enable */
  __HAL_RCC_GPIOA_CLK_ENABLE();

  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(GPIOA, GPIO_PIN_4, GPIO_PIN_RESET);

  /*Configure GPIO pin : PA3 */
  GPIO_InitStruct.Pin = GPIO_PIN_3;
  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  /*Configure GPIO pin : PA4 */
  GPIO_InitStruct.Pin = GPIO_PIN_4;
  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);

}

/* USER CODE BEGIN 4 */
int fputc(int ch, FILE *f)
{
  /* Place your implementation of fputc here */
  /* e.g. write a character to the EVAL_COM1 and Loop until the end of transmission */
  HAL_UART_Transmit(&huart1, (uint8_t *)&ch, 1, 0xFFFF);

  return ch;
}

/* USER CODE END 4 */

 /**
  * @brief  Period elapsed callback in non blocking mode
  * @note   This function is called  when TIM2 interrupt took place, inside
  * HAL_TIM_IRQHandler(). It makes a direct call to HAL_IncTick() to increment
  * a global variable "uwTick" used as application time base.
  * @param  htim : TIM handle
  * @retval None
  */
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
  /* USER CODE BEGIN Callback 0 */

  /* USER CODE END Callback 0 */
  if (htim->Instance == TIM2) {
    HAL_IncTick();
  }
  /* USER CODE BEGIN Callback 1 */
  /* USER CODE END Callback 1 */
}

/**
  * @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 */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/