STM32F103R6 SysTick Two-Digit Multiplexing Display and Push Button

In this example, I create a counter using a push button and a two-digit multiplexing display. The display is common cathode type. I use STM32 SysTick to drive either display and push button. The program is written using STM32CubeIDE. I use Proteus 8 to simulate this example program.

Simulating Program In Proteus

 The display is a two-digit common cathode type. I use two 74HC04 Hex inverter to drive the commons. However we can use two switching NPN transistors to drive the commons.

Only one single Port B is required. Between PB0 and PB9 are digital output pins. While PB15 is an digital input pin.

Code Configuration Wizard

Code Configuration Tool allow us to select any peripheral before the source code is generated. Each digits are activated around 5 Milli-seconds. SW2 switch is active low. It's activated by pressing event without depending on SysTick.

/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file           : main.c
  * @brief          : Main program body
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; Copyright (c) 2022 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 function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
/* USER CODE BEGIN PFP */
 
const char dCathode[10] = {0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F};
const char SW2=15;
volatile unsigned int msCnt=0,msSsd=0,pressCnt=0;
 
int main(void)
{
 
  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();
 
  /* Configure the system clock */
  SystemClock_Config();
 
  /* Initialize all configured peripherals */
  MX_GPIO_Init();
 
  /*SysTick Configuration*/
    SystemCoreClockUpdate();
    /*Generate interrupt for 100 us*/
    SysTick_Config(SystemCoreClock/10000);
    SysTick ->CTRL=0;
    SysTick ->VAL=0;
    SysTick ->CTRL=(SysTick_CTRL_TICKINT_Msk		//Enable SysTick Exception
  		  	  	  |SysTick_CTRL_ENABLE_Msk   //Enable SysTick system timer
  				  |SysTick_CTRL_CLKSOURCE_Msk); //Use process clock source
 
    while (1)
  {
	  switch(msSsd){
	  	  	  case 0:
	  	  		  	  GPIOB ->ODR &=~(1<<8) ;
	  	  		  	  GPIOB ->ODR = dCathode[pressCnt/10]|(1<<SW2);
	  	  		  	  GPIOB ->ODR |= GPIO_ODR_ODR8;
	  	  		  	  break;
 
	  	  	  case 5:
	  	  		  	  GPIOB ->ODR &=~(1<<9) ;
	  	  		  	  GPIOB ->ODR = dCathode[pressCnt%10]|(1<<SW2);
	  	  		  	  GPIOB ->ODR |= GPIO_ODR_ODR9;
	  	  		  	  break;
	  	  }
 
	  if((GPIOB->IDR&(1<<SW2))==0){
		  if(msCnt>=200){
		  			  msCnt=0;
		  			  pressCnt+=1;
		  		  }
	  }
 
  }
  /* USER CODE END 3 */
}
 
void SysTick_Handler(void)
{
 
  HAL_IncTick();
 
  if(uwTick>=10){
	  msCnt+=1;
	  msSsd+=1;
	  uwTick=0;
  }
 
  if(msCnt>=500) msCnt=0;
 
  if(msSsd>10) msSsd=0;
 
}
 
void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {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();
  }
}
 
/**
  * @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_GPIOB_CLK_ENABLE();
  __HAL_RCC_GPIOA_CLK_ENABLE();
 
  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(GPIOB, GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3
                          |GPIO_PIN_4|GPIO_PIN_5|GPIO_PIN_6|GPIO_PIN_7|GPIO_PIN_8|GPIO_PIN_9, GPIO_PIN_RESET);
 
  /*Configure GPIO pins : PB0 PB1 PB2 PB3
                           PB4 PB5 PB6 PB7 */
  GPIO_InitStruct.Pin = GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3
                          |GPIO_PIN_4|GPIO_PIN_5|GPIO_PIN_6|GPIO_PIN_7|GPIO_PIN_8|GPIO_PIN_9;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
 
  /*Configure GPIO pin : PB15 */
  GPIO_InitStruct.Pin = GPIO_PIN_15;
  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
  GPIO_InitStruct.Pull = GPIO_PULLUP;
  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
 
}
 
/* USER CODE BEGIN 4 */
 
/* 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 */
 
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
 

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