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蓝桥杯嵌入式第六届真题（完成）STM32G431
作者：思考机器2 | 2024-02-03 14:46:19
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蓝桥杯嵌入式第六届真题（完成）STM32G431
蓝桥杯嵌入式第六届真题（完成）STM32G431
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main.c
/* USER CODE BEGIN Header */ /** ****************************************************************************** * @file : main.c * @brief : Main program body ****************************************************************************** * @attention * * <h2><center>© 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 "rtc.h" #include "tim.h" #include "usart.h" #include "gpio.h" /* Private includes ----------------------------------------------------------*/ /* USER CODE BEGIN Includes */ #include "i2c_hal.h" #include "key.h" #include "myadc.h" #include "led.h" #include "string.h" /* USER CODE END Includes */ /* Private typedef -----------------------------------------------------------*/ /* USER CODE BEGIN PTD */ uint8_t lcdtext[30]; extern struct Key key[4]; uint8_t view = 0;//鍒濆lcd鏄剧ず RTC_TimeTypeDef Time; RTC_DateTypeDef Date; uint8_t h=0,m=0,s=0; float val; float k = 0.1; uint8_t ledflag = 1; uint8_t ledtimes; extern unsigned char Recive_Data[5]; extern unsigned char Temp_Data[1]; extern bool rxflag; extern unsigned char rx_pointer; uint32_t counter = 0; bool ledState = false; /* 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 key_process(void); void lcd_process(void); void led_process(void); void rx_process(void); void tx_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_TIM2_Init(); MX_ADC2_Init(); MX_RTC_Init(); MX_USART1_UART_Init(); /* USER CODE BEGIN 2 */ HAL_TIM_Base_Start_IT(&htim2); HAL_UART_Receive_IT(&huart1, Temp_Data, 1); LCD_Init(); /* USER CODE END 2 */ /* Infinite loop */ /* USER CODE BEGIN WHILE */ LCD_Clear(Black); LCD_SetBackColor(Black); LCD_SetTextColor(White); //EEPROM_Write_Float(0,0.9); //HAL_Delay(5); while (1) { lcd_process(); //EEPROM_Write(0,20); // HAL_RTC_GetDate(&hrtc,&Date,RTC_FORMAT_BIN); // HAL_RTC_GetTime(&hrtc,&Time,RTC_FORMAT_BIN); // sprintf((char *)lcdtext,"%.2f",get_adc(&hadc2)); // LCD_DisplayStringLine(Line2,lcdtext); // sprintf((char *)lcdtext,"%02d-%02d-%02d",Time.Hours,Time.Minutes,Time.Seconds); // LCD_DisplayStringLine(Line4,lcdtext); key_process(); led_process(); rx_process(); tx_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_OSCILLATORTYPE_LSI; RCC_OscInitStruct.HSIState = RCC_HSI_ON; RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT; RCC_OscInitStruct.LSIState = RCC_LSI_ON; 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_RTC|RCC_PERIPHCLK_USART1 |RCC_PERIPHCLK_ADC12; PeriphClkInit.Usart1ClockSelection = RCC_USART1CLKSOURCE_PCLK2; PeriphClkInit.Adc12ClockSelection = RCC_ADC12CLKSOURCE_SYSCLK; PeriphClkInit.RTCClockSelection = RCC_RTCCLKSOURCE_LSI; if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK) { Error_Handler(); } } /* USER CODE BEGIN 4 */ void key_process(void) { if(key[0].key_flag==1&&view==0) { LCD_Clear(Black); key[0].key_flag=0; view = 1; ledflag = 0; } else if(key[0].key_flag==1&&view==1) { LCD_Clear(Black); key[0].key_flag=0; view = 0; ledflag = 1; } if(key[1].key_flag==1&&(view==0||view==1)) { LCD_Clear(Black); key[1].key_flag=0; view = 2; } if(key[1].key_flag==1&&(view==3||view==4||view==5)) { LCD_Clear(Black); key[1].key_flag=0; view = 0; } if(key[2].key_flag==1&&(view==2||view==3||view==4||view==5)) { LCD_Clear(Black); key[2].key_flag=0; view++; if(view>5) { view = 3; } } if(key[3].key_flag==1&&view==3) { LCD_Clear(Black); key[3].key_flag=0; h++; if(h>24) { h=0; } } else if (key[3].key_flag==1&&view==4) { LCD_Clear(Black); key[3].key_flag=0; m++; if(m>60) { m=0; } } else if (key[3].key_flag==1&&view==5) { LCD_Clear(Black); key[3].key_flag=0; s++; if(s>60) { s=0; } } } void lcd_process(void) { switch (view) { case 0: //LED鎵撳紑鐣岄潰 { val = get_adc(&hadc2); sprintf((char *)lcdtext," V1:%.2f ",val); LCD_DisplayStringLine(Line1,lcdtext); sprintf((char *)lcdtext," K:%.1f ",EEPROM_Read_Float(0)); LCD_DisplayStringLine(Line3,lcdtext); sprintf((char *)lcdtext," LED:ON "); LCD_DisplayStringLine(Line5,lcdtext); HAL_RTC_GetDate(&hrtc,&Date,RTC_FORMAT_BIN); HAL_RTC_GetTime(&hrtc,&Time,RTC_FORMAT_BIN); sprintf((char *)lcdtext," T:%02d-%02d-%02d",Time.Hours,Time.Minutes,Time.Seconds); LCD_DisplayStringLine(Line7,lcdtext); } break; case 1://LED鍏抽棴鐣岄潰 { val = get_adc(&hadc2); sprintf((char *)lcdtext," V1:%.2f ",val); LCD_DisplayStringLine(Line1,lcdtext); sprintf((char *)lcdtext," K:%.1f ",EEPROM_Read_Float(0)); LCD_DisplayStringLine(Line3,lcdtext); sprintf((char *)lcdtext," LED:OFF "); LCD_DisplayStringLine(Line5,lcdtext); HAL_RTC_GetDate(&hrtc,&Date,RTC_FORMAT_BIN); HAL_RTC_GetTime(&hrtc,&Time,RTC_FORMAT_BIN); sprintf((char *)lcdtext," T:%02d-%02d-%02d",Time.Hours,Time.Minutes,Time.Seconds); LCD_DisplayStringLine(Line7,lcdtext); } break; case 2://璁剧疆鐣岄潰 { sprintf((char *)lcdtext," Setting "); LCD_DisplayStringLine(Line3,lcdtext); sprintf((char *)lcdtext," %02d - %02d - %02d",h,m,s); LCD_DisplayStringLine(Line5,lcdtext); } break; case 3://璁剧疆灏忔椂鐣岄潰 { sprintf((char *)lcdtext," Setting "); LCD_DisplayStringLine(Line3,lcdtext); sprintf((char *)lcdtext," %02d - %02d - %02d",h,m,s); LCD_DisplayStringLine(Line5,lcdtext); sprintf((char *)lcdtext," --"); LCD_DisplayStringLine(Line6,lcdtext); } break; case 4://璁剧疆鍒嗛挓鐣岄潰 { sprintf((char *)lcdtext," Setting "); LCD_DisplayStringLine(Line3,lcdtext); sprintf((char *)lcdtext," %02d - %02d - %02d",h,m,s); LCD_DisplayStringLine(Line5,lcdtext); sprintf((char *)lcdtext," --"); LCD_DisplayStringLine(Line6,lcdtext); } break; case 5://璁剧疆绉掔晫闈? { sprintf((char *)lcdtext," Setting "); LCD_DisplayStringLine(Line3,lcdtext); sprintf((char *)lcdtext," %02d - %02d - %02d",h,m,s); LCD_DisplayStringLine(Line5,lcdtext); sprintf((char *)lcdtext," --"); LCD_DisplayStringLine(Line6,lcdtext); } break; default: break; } } void led_process(void) { if (ledflag && val > 3.3f * k) { if (ledState) { leddisplay(0x02); }else{ leddisplay(0x00); } } } void rx_process(void) { if(rxflag) { if(Recive_Data[3] == '1') { k = 0.1; char My_sentdata[30]; sprintf(My_sentdata,"ok\n"); HAL_UART_Transmit(&huart1,(uint8_t*)My_sentdata,strlen(My_sentdata),50); } else if(Recive_Data[3] == '2') { k = 0.2; char My_sentdata[30]; sprintf(My_sentdata,"ok\n"); HAL_UART_Transmit(&huart1,(uint8_t*)My_sentdata,strlen(My_sentdata),50); } else if(Recive_Data[3] == '3') { k = 0.3; char My_sentdata[30]; sprintf(My_sentdata,"ok\n"); HAL_UART_Transmit(&huart1,(uint8_t*)My_sentdata,strlen(My_sentdata),50); } else if(Recive_Data[3] == '4') { k = 0.4; char My_sentdata[30]; sprintf(My_sentdata,"ok\n"); HAL_UART_Transmit(&huart1,(uint8_t*)My_sentdata,strlen(My_sentdata),50); } else if(Recive_Data[3] == '5') { k = 0.5; char My_sentdata[30]; sprintf(My_sentdata,"ok\n"); HAL_UART_Transmit(&huart1,(uint8_t*)My_sentdata,strlen(My_sentdata),50); } else if(Recive_Data[3] == '6') { k = 0.6; char My_sentdata[30]; sprintf(My_sentdata,"ok\n"); HAL_UART_Transmit(&huart1,(uint8_t*)My_sentdata,strlen(My_sentdata),50); } else if(Recive_Data[3] == '7') { k = 0.7; char My_sentdata[30]; sprintf(My_sentdata,"ok\n"); HAL_UART_Transmit(&huart1,(uint8_t*)My_sentdata,strlen(My_sentdata),50); } else if(Recive_Data[3] == '8') { k = 0.8; char My_sentdata[30]; sprintf(My_sentdata,"ok\n"); HAL_UART_Transmit(&huart1,(uint8_t*)My_sentdata,strlen(My_sentdata),50); } else if(Recive_Data[3] == '9') { k = 0.9; char My_sentdata[30]; sprintf(My_sentdata,"ok\n"); HAL_UART_Transmit(&huart1,(uint8_t*)My_sentdata,strlen(My_sentdata),50); } EEPROM_Write_Float(0,k); rx_pointer=0; rxflag=false; memset(Recive_Data,0,5); } } void tx_process(void) { static bool already_sent = false; if(Time.Hours == h && Time.Minutes == m && Time.Seconds == s) { if (!already_sent) // 检查是否已经发送过数据 { char My_sentdata[30]; sprintf(My_sentdata,"%.2f+%.1f+%02d%02d%02d\n", val, k, h, m, s); HAL_UART_Transmit(&huart1, (uint8_t*)My_sentdata, strlen(My_sentdata), 50); already_sent = true; // 标记已发送 } } else { already_sent = false; // 当时间改变时重置标志 } } /* 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****/
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void key_process(void);
处理按键任务，用户多个界面之间的转换以及上报时间的设置，根据当前lcd的状态，来决定按键按下的功能
void lcd_process(void);
显示各种状态,使用状态机，显示不同状态，使用sprinf函数格式化重定向字符串
void led_process(void);
控制led闪烁，使用一个计数值，在抵达定时器中++实现200ms计数
void rx_process(void);
控制串口发送的数据，不知为何HAL_UART_Receive_IT(huart, Temp_Data, 1);中如果不是1，就会只能进入一次串口接收回调函数，所以使用每次接收一个然后设置一个缓冲区，控制指针来一次接收5个数据，只有接受完五个数据即进入5次串口接收回调函数后才执行解析函数，注意最后全波清0
void tx_process(void);
控制上报的数据，当rtc时钟的时间到达设置时间发送数据
led.c
#include "led.h"
void leddisplay(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);
}
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该板子是低电平点亮，8个led灯使用的是高8位所以需要左移8位，led等于几就是将高8位中第几位设置成低电平即点亮，由于led与lcd复用引脚最后打开锁存器让值被写入之后，立刻关闭锁存器防止影响lcd
myadc.c
#include "myadc.h"
float get_adc(ADC_HandleTypeDef *hadc)
{
float val;
// 等待ADC转换完成
HAL_ADC_Start(hadc);
val = HAL_ADC_GetValue(hadc);
return val*3.3f/4096;
}
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usart1.c
#include "usart1.h" #include "string.h" #include "usart.h" #include "stdbool.h" extern float k; unsigned char Recive_Data[5]; unsigned char Temp_Data[1]; unsigned char rx_pointer = 0; bool rxflag = false; char usartsend[30]; void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart) { if(huart->Instance==USART1) { Recive_Data[rx_pointer++] = Temp_Data[0]; HAL_UART_Receive_IT(huart, Temp_Data, 1); if(Recive_Data[4]!=0) { rxflag = true; } } }
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接收完四个之后置一个标志位，rx_process才能执行，每次都需调用HAL_UART_Receive_IT函数重新开启串口接收
key.c
#include "key.h" #include "led.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<4;i++) { switch (key[i].key_index) { case 0:/* constant-expression */ { if(key[i].key_gpio==0) { key[i].key_index = 1; } } break; case 1: { if(key[i].key_gpio==0) { key[i].key_index = 2; key[i].key_flag=1; }else{ key[i].key_index = 0; } } case 2: { if(key[i].key_gpio==1) { key[i].key_index=0; } } break; } } } }
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使用状态机，第一次进入之后，进入下一个状态，如果电平还是刚刚的电平说明真的按下,如果不是重新进入第一个状态重新判断，定时器定时时间10ms刚好消抖，最后一个case2是判断如果按键松开，说明可以进入下一次判断。
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" #include "main.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); } void EEPROM_Write(uint8_t address,uint8_t Data) { I2CStart(); I2CSendByte(0xA0); I2CWaitAck(); I2CSendByte(address); I2CWaitAck(); I2CSendByte(Data); I2CWaitAck(); I2CStop(); } uint8_t EEPROM_Read(uint8_t address) { uint8_t data; I2CStart(); I2CSendByte(0xA0); I2CWaitAck(); I2CSendByte(address); I2CWaitAck(); I2CStop(); I2CStart(); I2CSendByte(0xA1); I2CWaitAck(); data = I2CReceiveByte(); I2CWaitAck(); I2CStop(); return data; } void EEPROM_Write_Float(uint8_t address, float data) { union FloatUnion fu; fu.floatval = data; for(int i = 0; i < sizeof(float); i++) { EEPROM_Write(address + i, fu.bytes[i]); HAL_Delay(5); } } float EEPROM_Read_Float(uint8_t address) { union FloatUnion fu; for(int i = 0; i < sizeof(float); i++) { fu.bytes[i] = EEPROM_Read(address + i); } return fu.floatval; }
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只有最后四个函数是本人写的，其余为蓝桥杯官方提供，主要是两种i2c时序，指定地址写和指定地址读的时序，重点在读需要首先写入要读取的地址之后再开始读，浮点数的存储使用联合体union
floatval和bytes数组共用内存
可以看本人文章stm32教程中有对i2c四种时序的说明
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