蓝桥杯嵌入式第七届真题(完成) STM32G431

题目

相关文件

main.c

/* USER CODE BEGIN Header */
/********************************************************************************* @file           : main.c* @brief          : Main program body******************************************************************************* @attention** <h2><center>&copy; Copyright (c) 2021 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"
#include "adc.h"
#include "tim.h"
#include "usart.h"
#include "gpio.h"/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include "myadc.h"
#include "key.h"
#include "i2c_hal.h"
#include "stdio.h"
#include "led.h"
#include "usart2.h"
#include "string.h"
#include "stdio.h"
/* USER CODE END Includes *//* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
extern uint32_t adctimes;
extern float k;//K? 
extern float adcval;
extern uint32_t height;
extern uint8_t level;
extern unsigned char min,med,max;
uint8_t view = 0;
uint8_t lcdtext[30];
extern struct Key key[4];
extern uint32_t led1times,led2times,led3times;
extern uint8_t led2flag,led3flag;
extern uint8_t led1status,led2status,led3status;
extern uint8_t OneData;
extern uint8_t rxflag;
uint8_t txtext[20];
/* 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 ---------------------------------------------------------*//* USER CODE BEGIN PV *//* USER CODE END PV *//* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
/* USER CODE BEGIN PFP */
void lcd_process(void);
void led_process(void);
void adc_process(void);
void key_process(void);
void rx_process(void);
/* 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 *//* 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_ADC2_Init();MX_TIM2_Init();MX_USART1_UART_Init();/* USER CODE BEGIN 2 */HAL_TIM_Base_Start_IT(&htim2);HAL_UART_Receive_IT(&huart1,&OneData,1);LCD_Init();I2CInit(); /* USER CODE END 2 *//* Infinite loop *//* USER CODE BEGIN WHILE */LCD_Clear(Black);LCD_SetBackColor(Black);LCD_SetTextColor(White);E2PROM_Write(0x00,min);HAL_Delay(5);E2PROM_Write(0x01,med);HAL_Delay(5);E2PROM_Write(0x02,max);	HAL_Delay(5);LED_display(0x00);while (1){adc_process();key_process();lcd_process();led_process();rx_process();/* 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};/** Configure the main internal regulator output voltage*/HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1);/** 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_ON;RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;RCC_OscInitStruct.PLL.PLLM = RCC_PLLM_DIV2;RCC_OscInitStruct.PLL.PLLN = 20;RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV2;RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;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_PLLCLK;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_2) != HAL_OK){Error_Handler();}/** Initializes the peripherals clocks*/PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USART1|RCC_PERIPHCLK_ADC12;PeriphClkInit.Usart1ClockSelection = RCC_USART1CLKSOURCE_PCLK2;PeriphClkInit.Adc12ClockSelection = RCC_ADC12CLKSOURCE_SYSCLK;if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK){Error_Handler();}
}/* USER CODE BEGIN 4 */
void adc_process(void)
{float newadcval;uint8_t newlevel;uint32_t newheight;int change;min = E2PROM_Read(0x00);med = E2PROM_Read(0x01);max = E2PROM_Read(0x02);if(adctimes >= 1000){adctimes = 0;newadcval = get_Adc(&hadc2);newheight = k * newadcval;if(newheight <= min){newlevel = 0;}else if(newheight <= med){newlevel = 1;}else if(newheight <= max){newlevel = 2;}else{newlevel = 3;}if(level != newlevel){led2flag = 1; // 激活液位变化指示change = newheight - height;height = newheight;adcval = newadcval; // 更新adcvallevel = newlevel;if(change > 0){sprintf((char *)txtext, "A:H%d+L%d+U\r\n", height, level);HAL_UART_Transmit(&huart1, (uint8_t *)txtext, strlen((char *)txtext), 50);}else if(change < 0){sprintf((char *)txtext, "A:H%d+L%d+D\r\n", height, level);HAL_UART_Transmit(&huart1, (uint8_t *)txtext, strlen((char *)txtext), 50);}}}
}void lcd_process(void)
{switch(view){case 0:{sprintf((char *)lcdtext,"    Liquid Level");LCD_DisplayStringLine(Line0,lcdtext);sprintf((char *)lcdtext,"   Height:%d",height);LCD_DisplayStringLine(Line2,lcdtext);sprintf((char *)lcdtext,"   ADC:%.2f",adcval);LCD_DisplayStringLine(Line4,lcdtext);sprintf((char *)lcdtext,"   Level:%d",level);LCD_DisplayStringLine(Line6,lcdtext);}break;case 1:{sprintf((char *)lcdtext,"    Parameter Setup");LCD_DisplayStringLine(Line0,lcdtext);sprintf((char *)lcdtext,"   Threshold 1:%d",min);LCD_DisplayStringLine(Line2,lcdtext);sprintf((char *)lcdtext,"   Threshold 2:%d",med);LCD_DisplayStringLine(Line4,lcdtext);sprintf((char *)lcdtext,"   Threshold 3:%d",max);LCD_DisplayStringLine(Line6,lcdtext);}break;case 2:{sprintf((char *)lcdtext,"    Parameter Setup");LCD_DisplayStringLine(Line0,lcdtext);sprintf((char *)lcdtext,"   Threshold 1:%d",min);LCD_SetTextColor(Green);LCD_DisplayStringLine(Line2,lcdtext);LCD_SetTextColor(White);sprintf((char *)lcdtext,"   Threshold 2:%d",med);LCD_DisplayStringLine(Line4,lcdtext);sprintf((char *)lcdtext,"   Threshold 3:%d",max);LCD_DisplayStringLine(Line6,lcdtext);}break;case 3:{sprintf((char *)lcdtext,"    Parameter Setup");LCD_DisplayStringLine(Line0,lcdtext);sprintf((char *)lcdtext,"   Threshold 1:%d",min);LCD_DisplayStringLine(Line2,lcdtext);sprintf((char *)lcdtext,"   Threshold 2:%d",med);LCD_SetTextColor(Green);LCD_DisplayStringLine(Line4,lcdtext);LCD_SetTextColor(White);sprintf((char *)lcdtext,"   Threshold 3:%d",max);LCD_DisplayStringLine(Line6,lcdtext);}break;case 4:{sprintf((char *)lcdtext,"    Parameter Setup");LCD_DisplayStringLine(Line0,lcdtext);sprintf((char *)lcdtext,"   Threshold 1:%d",min);LCD_DisplayStringLine(Line2,lcdtext);sprintf((char *)lcdtext,"   Threshold 2:%d",med);LCD_DisplayStringLine(Line4,lcdtext);sprintf((char *)lcdtext,"   Threshold 3:%d",max);LCD_SetTextColor(Green);LCD_DisplayStringLine(Line6,lcdtext);LCD_SetTextColor(White);}break;}
}void key_process(void)
{if(key[0].key_flag==1&&(view==0)){key[0].key_flag=0;view=1;LCD_Clear(Black);LCD_SetBackColor(Black);LCD_SetTextColor(White);}if(key[0].key_flag==1&&(view==1||view==2||view==3||view==4)){key[0].key_flag=0;view=0;LCD_Clear(Black);LCD_SetBackColor(Black);LCD_SetTextColor(White);}if(key[1].key_flag==1&&(view==1||view==2||view==3||view==4)){LCD_Clear(Black);LCD_SetBackColor(Black);LCD_SetTextColor(White);key[1].key_flag=0;view++;if(view>4)view=2;}if(key[2].key_flag==1&&view==2){LCD_Clear(Black);LCD_SetBackColor(Black);LCD_SetTextColor(White);key[2].key_flag=0;min+=5;if(min>95)min=5;E2PROM_Write(0x00,min);}else if(key[2].key_flag==1&&view==3){LCD_Clear(Black);LCD_SetBackColor(Black);LCD_SetTextColor(White);key[2].key_flag=0;med+=5;if(med>95)med=5;E2PROM_Write(0x01,med);}else if(key[2].key_flag==1&&view==4){LCD_Clear(Black);LCD_SetBackColor(Black);LCD_SetTextColor(White);key[2].key_flag=0;max+=5;if(max>95)max=5;E2PROM_Write(0x02,max);}if(key[3].key_flag==1&&view==2){LCD_Clear(Black);LCD_SetBackColor(Black);LCD_SetTextColor(White);key[3].key_flag=0;min-=5;if(min<5)min=5;E2PROM_Write(0x00,min);}else if(key[3].key_flag==1&&view==3){LCD_Clear(Black);LCD_SetBackColor(Black);LCD_SetTextColor(White);key[3].key_flag=0;med-=5;if(med<5)med=5;E2PROM_Write(0x01,med);}else if(key[3].key_flag==1&&view==4){LCD_Clear(Black);LCD_SetBackColor(Black);LCD_SetTextColor(White);key[3].key_flag=0;max-=5;if(max<5)max=5;E2PROM_Write(0x01,max);}
}void led_process(void)
{// LD1处理if(led1times >= 1000) // 每1秒{led1times = 0;led1status = !led1status;LED_display(led1status ? 0x01 : 0x00);}// LD2处理static int led2count = 0;if(led2flag && led2times >= 200) // 每0.2秒{led2times = 0;led2status = !led2status;LED_display(led2status ? 0x02 : 0x00);if(led2status) // 只在LED从关闭状态变为开启状态时增加计数{led2count++;}if(led2count >= 5) // 闪烁5次后停止{led2flag = 0;led2count = 0;}}// LD3处理static int led3count = 0;if(led3flag && led3times >= 200) // 每0.2秒{led3times = 0;led3status = !led3status;LED_display(led3status ? 0x04 : 0x00);if(led3status) // 只在LED从关闭状态变为开启状态时增加计数{led3count++;}if(led3count >= 5) // 闪烁5次后停止{led3flag = 0;led3count = 0;}}
}void rx_process(void)
{if(rxflag==1){led3flag = 1;rxflag = 0;switch(OneData){case 'C':{sprintf((char *)txtext,"C:H%d+L%d\r\n",height,level);HAL_UART_Transmit(&huart1,(uint8_t *)txtext,strlen((char *)txtext),50);}break;case 'S':{sprintf((char *)txtext,"S:TL%d+TM%d+TH%d\r\n",min,med,max);HAL_UART_Transmit(&huart1,(uint8_t *)txtext,strlen((char *)txtext),50);}break;default:{sprintf((char *)txtext,"Error!\r\n");HAL_UART_Transmit(&huart1,(uint8_t *)txtext,strlen((char *)txtext),50);}break;}}
}
/* 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 *//* 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,tex: 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****/

adc_process 中1s读取一次使用1ms进入一次SysTick_Handler 中断定时

newadcval、newlevel、newheight都是最新一次数据，与上一次数据比较是否液位发生变化

led_process中题目要求三个led按要求变化，led1要一直闪烁，led2、led3满足特定条件后才变化翻转所以使用两个标志位led2flag和led3flag同时使用静态变量led2count计数闪烁五次后关闭

i2c_hal.c

/*程序说明: CT117E-M4嵌入式竞赛板GPIO模拟I2C总线驱动程序软件环境: MDK-ARM HAL库硬件环境: CT117E-M4嵌入式竞赛板日    期: 2020-3-1
*/#include "i2c_hal.h"#define DELAY_TIME	20/*** @brief SDA线输入模式配置* @param None* @retval None*/
void SDA_Input_Mode()
{GPIO_InitTypeDef GPIO_InitStructure = {0};GPIO_InitStructure.Pin = GPIO_PIN_7;GPIO_InitStructure.Mode = GPIO_MODE_INPUT;GPIO_InitStructure.Pull = GPIO_PULLUP;GPIO_InitStructure.Speed = GPIO_SPEED_FREQ_HIGH;HAL_GPIO_Init(GPIOB, &GPIO_InitStructure);
}/*** @brief SDA线输出模式配置* @param None* @retval None*/
void SDA_Output_Mode()
{GPIO_InitTypeDef GPIO_InitStructure = {0};GPIO_InitStructure.Pin = GPIO_PIN_7;GPIO_InitStructure.Mode = GPIO_MODE_OUTPUT_OD;GPIO_InitStructure.Pull = GPIO_NOPULL;GPIO_InitStructure.Speed = GPIO_SPEED_FREQ_HIGH;HAL_GPIO_Init(GPIOB, &GPIO_InitStructure);
}/*** @brief SDA线输出一个位* @param val 输出的数据* @retval None*/
void SDA_Output( uint16_t val )
{if ( val ){GPIOB->BSRR |= GPIO_PIN_7;}else{GPIOB->BRR |= GPIO_PIN_7;}
}/*** @brief SCL线输出一个位* @param val 输出的数据* @retval None*/
void SCL_Output( uint16_t val )
{if ( val ){GPIOB->BSRR |= GPIO_PIN_6;}else{GPIOB->BRR |= GPIO_PIN_6;}
}/*** @brief SDA输入一位* @param None* @retval GPIO读入一位*/
uint8_t SDA_Input(void)
{if(HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_7) == GPIO_PIN_SET){return 1;}else{return 0;}
}/*** @brief I2C的短暂延时* @param None* @retval None*/
static void delay1(unsigned int n)
{uint32_t i;for ( i = 0; i < n; ++i);
}/*** @brief I2C起始信号* @param None* @retval None*/
void I2CStart(void)
{SDA_Output(1);delay1(DELAY_TIME);SCL_Output(1);delay1(DELAY_TIME);SDA_Output(0);delay1(DELAY_TIME);SCL_Output(0);delay1(DELAY_TIME);
}/*** @brief I2C结束信号* @param None* @retval None*/
void I2CStop(void)
{SCL_Output(0);delay1(DELAY_TIME);SDA_Output(0);delay1(DELAY_TIME);SCL_Output(1);delay1(DELAY_TIME);SDA_Output(1);delay1(DELAY_TIME);}/*** @brief I2C等待确认信号* @param None* @retval None*/
unsigned char I2CWaitAck(void)
{unsigned short cErrTime = 5;SDA_Input_Mode();delay1(DELAY_TIME);SCL_Output(1);delay1(DELAY_TIME);while(SDA_Input()){cErrTime--;delay1(DELAY_TIME);if (0 == cErrTime){SDA_Output_Mode();I2CStop();return ERROR;}}SDA_Output_Mode();SCL_Output(0);delay1(DELAY_TIME);return SUCCESS;
}/*** @brief I2C发送确认信号* @param None* @retval None*/
void I2CSendAck(void)
{SDA_Output(0);delay1(DELAY_TIME);delay1(DELAY_TIME);SCL_Output(1);delay1(DELAY_TIME);SCL_Output(0);delay1(DELAY_TIME);}/*** @brief I2C发送非确认信号* @param None* @retval None*/
void I2CSendNotAck(void)
{SDA_Output(1);delay1(DELAY_TIME);delay1(DELAY_TIME);SCL_Output(1);delay1(DELAY_TIME);SCL_Output(0);delay1(DELAY_TIME);}/*** @brief I2C发送一个字节* @param cSendByte 需要发送的字节* @retval None*/
void I2CSendByte(unsigned char cSendByte)
{unsigned char  i = 8;while (i--){SCL_Output(0);delay1(DELAY_TIME);SDA_Output(cSendByte & 0x80);delay1(DELAY_TIME);cSendByte += cSendByte;delay1(DELAY_TIME);SCL_Output(1);delay1(DELAY_TIME);}SCL_Output(0);delay1(DELAY_TIME);
}/*** @brief I2C接收一个字节* @param None* @retval 接收到的字节*/
unsigned char I2CReceiveByte(void)
{unsigned char i = 8;unsigned char cR_Byte = 0;SDA_Input_Mode();while (i--){cR_Byte += cR_Byte;SCL_Output(0);delay1(DELAY_TIME);delay1(DELAY_TIME);SCL_Output(1);delay1(DELAY_TIME);cR_Byte |=  SDA_Input();}SCL_Output(0);delay1(DELAY_TIME);SDA_Output_Mode();return cR_Byte;
}//
void I2CInit(void)
{GPIO_InitTypeDef GPIO_InitStructure = {0};GPIO_InitStructure.Pin = GPIO_PIN_7 | GPIO_PIN_6;GPIO_InitStructure.Mode = GPIO_MODE_OUTPUT_PP;GPIO_InitStructure.Pull = GPIO_PULLUP;GPIO_InitStructure.Speed = GPIO_SPEED_FREQ_HIGH;HAL_GPIO_Init(GPIOB, &GPIO_InitStructure);
}uint8_t E2PROM_Read(uint8_t addr)
{uint8_t val;I2CStart();I2CSendByte(0xA0);I2CWaitAck();I2CSendByte(addr);I2CWaitAck();//I2CStop();I2CStart();I2CSendByte(0xA1);I2CWaitAck();val = I2CReceiveByte();I2CWaitAck();I2CStop();return val;
}void E2PROM_Write(uint8_t addr,uint8_t data)
{I2CStart();I2CSendByte(0xA0);I2CWaitAck();I2CSendByte(addr);I2CWaitAck();I2CSendByte(data);I2CWaitAck();I2CStop();
}

key.c

#include "key.h"
struct Key key[4] = {0,0,0,0};void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{if(htim->Instance==TIM2){key[0].key_gpio = HAL_GPIO_ReadPin(GPIOB,GPIO_PIN_0);key[1].key_gpio = HAL_GPIO_ReadPin(GPIOB,GPIO_PIN_1);key[2].key_gpio = HAL_GPIO_ReadPin(GPIOB,GPIO_PIN_2);key[3].key_gpio = HAL_GPIO_ReadPin(GPIOA,GPIO_PIN_0);for(int i = 0;i<=3;i++){switch(key[i].key_status){case 0:{if(key[i].key_gpio==0){key[i].key_status = 1;}}break;case 1:{if(key[i].key_gpio==0){key[i].key_status = 2;key[i].key_flag = 1;}else{key[i].key_status = 0;}}break;case 2:{if(key[i].key_gpio==1){key[i].key_status = 0;}}}}}}

led.c

#include "led.h"uint32_t led1times,led2times,led3times;
uint8_t led1status=0,led2status=0,led3status=0;
uint8_t led2flag= 0,led3flag=0;
void LED_display(uint8_t led)
{HAL_GPIO_WritePin(GPIOC,GPIO_PIN_All,GPIO_PIN_SET);HAL_GPIO_WritePin(GPIOD,GPIO_PIN_2,GPIO_PIN_SET);HAL_GPIO_WritePin(GPIOD,GPIO_PIN_2,GPIO_PIN_RESET);HAL_GPIO_WritePin(GPIOC,led<<8,GPIO_PIN_RESET);HAL_GPIO_WritePin(GPIOD,GPIO_PIN_2,GPIO_PIN_SET);HAL_GPIO_WritePin(GPIOD,GPIO_PIN_2,GPIO_PIN_RESET);
}

注意i2c再写数据时注意要间隔5ms以上要不然会数据异常

myadc.c

#include "myadc.h"uint32_t adctimes = 0;
float k = 100/(3.3f);//Kֵ 
uint32_t height;
float adcval;
uint8_t level;
unsigned char min=30,med=50,max=70;
float get_Adc(ADC_HandleTypeDef *hadc){int val = 0.0f;for(int i = 0; i < 5; i++){HAL_ADC_Start(hadc);HAL_ADC_PollForConversion(hadc, 100); // 等待转换完成val += HAL_ADC_GetValue(hadc);HAL_ADC_Stop(hadc); // 停止ADC转换}return val * 3.3f / 4096.0f / 5.0f; // 计算平均电压值
}

usart2.c

#include "usart2.h"uint8_t OneData;
uint8_t rxflag;void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{if(huart->Instance==USART1){rxflag = 1;HAL_UART_Receive_IT(huart,&OneData,1);}}