STM32F103C8T6 Blue Pill Switch And Multiplexing Display Interface Using SysTick

In previous post, I have wrote about using STM32 ARM SysTick to drive a multiplexing display. In this post, it's similar to the previous one's. Additionally I will add a push button to count the number of switch pressing. This button also use SysTick too. It's periodically check the switch pressing event.

Running Program On Breadboard

It will count up to 999 before it rolls down to 0. Input button is active low. It's pulled up by software without external resistor.

Simulating Program In Proteus 8.15

 I have to to configure the OSC frequency and other settings to make to run properly.

MCU Properties

STM32CubeIDE is easy to use because it has code generation wizard.

MCU software configuration

Source Code:

/* 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};
volatile unsigned int msCnt=0,msSsd=0,pressCnt=0,swTime=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
  		  	  	  	  |SysTick_CTRL_ENABLE_Msk
  					  |SysTick_CTRL_CLKSOURCE_Msk);
 
  /* USER CODE BEGIN WHILE */
  while (1)
  {
	  /*Multiplexing Display Process*/
	  switch(msSsd){
	  	  case 0:
	  		  GPIOC->ODR=0;
	  		  GPIOA ->ODR=dCathode[pressCnt/100]<<1;
	  		  GPIOC ->ODR = GPIO_ODR_ODR13;
	  		  break;
 
	  	  case 5:
	  		  GPIOC->ODR=0;
	  		  GPIOA ->ODR=dCathode[(pressCnt%100)/10]<<1;
	  		  GPIOC ->ODR = GPIO_ODR_ODR14;
	  		  break;
 
	  	  case 10:
	  		  GPIOC->ODR=0;
	  		  GPIOA ->ODR=dCathode[pressCnt%10]<<1;
	  		  GPIOC ->ODR = GPIO_ODR_ODR15;
	  		  break;
	  	  case 15:
	  		  msSsd=0;
	  		  GPIOA->ODR=0;
	  		  GPIOC->ODR=0;
	  	  }
	  /*Switch Pressing*/
	  if(msCnt>=300){
		  if(HAL_GPIO_ReadPin(SW_GPIO_Port,SW_Pin)==0){
			  pressCnt+=1;
			  msCnt=0;
		  }
	  }
	  if(pressCnt>=1000) pressCnt=0;
  }
  /* USER CODE END 3 */
}
 
void SysTick_Handler(void)
{
 
  HAL_IncTick();
 
  if(uwTick>=10){
	  msCnt+=1;
	  msSsd+=1;
	  swTime+=1;
	  uwTick=0;
  }
 
  //if(msSsd>15) msSsd=0;
  if(pressCnt>999) pressCnt=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_GPIOC_CLK_ENABLE();
  __HAL_RCC_GPIOA_CLK_ENABLE();
  __HAL_RCC_GPIOB_CLK_ENABLE();
 
  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(GPIOC, GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15, GPIO_PIN_RESET);
 
  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(GPIOA, GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3|GPIO_PIN_4
                          |GPIO_PIN_5|GPIO_PIN_6|GPIO_PIN_7, GPIO_PIN_RESET);
 
  /*Configure GPIO pins : PC13 PC14 PC15 */
  GPIO_InitStruct.Pin = GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
 
  /*Configure GPIO pins : PA1 PA2 PA3 PA4
                           PA5 PA6 PA7 */
  GPIO_InitStruct.Pin = GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3|GPIO_PIN_4
                          |GPIO_PIN_5|GPIO_PIN_6|GPIO_PIN_7;
  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);
 
  /*Configure GPIO pin : SW_Pin */
  GPIO_InitStruct.Pin = SW_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
  GPIO_InitStruct.Pull = GPIO_PULLUP;
  HAL_GPIO_Init(SW_GPIO_Port, &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****/
 

 

Click here to download its source file. For other similar posts please check,

1. Getting Started With STM32F103C8T6 Module with STM32CubeIDE
2.  STM32F103C8T6 Blue Pill SysTick and Multiplexing Display Example
3.  STM32F103C8T6 Blue Pill Switch And Multiplexing Display Interface Using SysTick
4.  STM32F103C8T6 Blue Pill SysTick LED Blinking