【蓝桥杯嵌入式】8_IIC通信-eeprom读写

全部代码网盘自取

链接：https://pan.baidu.com/s/1PX2NCQxnADxYBQx5CsOgPA?pwd=3ii2 
提取码：3ii2

1、电路图

这个电路允许通过I2C总线与EEPROM(M24C02-WMN6TP)和数字电位器(MCP4017T-104ELT)进行通信。EEPROM用于存储数据，而数字电位器可以用于调节模拟电压输出。通过I2C总线，微控制器可以读取EEPROM中的数据或配置数字电位器的电阻值。

2、Cube配置

将PB7和PB6设置为output

将官方提供的I2C底层代码放到工程目录下

3、代码

我们在前面输入捕获频率的基础上，增加按键功能，并用eeprom存储频率（整型数据）

修改i2c_hal.h和i2c_hal.c文件

i2c_hal.h

#ifndef __I2C_HAL_H
#define __I2C_HAL_H#include "main.h"void I2CStart(void);
void I2CStop(void);
unsigned char I2CWaitAck(void);
void I2CSendAck(void);
void I2CSendNotAck(void);
void I2CSendByte(unsigned char cSendByte);
unsigned char I2CReceiveByte(void);
void I2CInit(void);
uchar eeprom_read(uchar addr);
void eeprom_write(uchar addr,uchar data);
#endif

i2c_hal.c

/*����˵��: CT117E-M4Ƕ��ʽ������GPIOģ��I2C��������������������: MDK-ARM HAL��Ӳ������: CT117E-M4Ƕ��ʽ��������    ��: 2020-3-1
*/#include "i2c_hal.h"#define DELAY_TIME	20/*** @brief SDA������ģʽ����* @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�����ģʽ����* @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�����һ��λ* @param val ���������* @retval None*/
void SDA_Output( uint16_t val )
{if ( val ){GPIOB->BSRR |= GPIO_PIN_7;}else{GPIOB->BRR |= GPIO_PIN_7;}
}/*** @brief SCL�����һ��λ* @param val ���������* @retval None*/
void SCL_Output( uint16_t val )
{if ( val ){GPIOB->BSRR |= GPIO_PIN_6;}else{GPIOB->BRR |= GPIO_PIN_6;}
}/*** @brief SDA����һλ* @param None* @retval GPIO����һλ*/
uint8_t SDA_Input(void)
{if(HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_7) == GPIO_PIN_SET){return 1;}else{return 0;}
}/*** @brief I2C�Ķ�����ʱ* @param None* @retval None*/
static void delay1(unsigned int n)
{uint32_t i;for ( i = 0; i < n; ++i);
}/*** @brief I2C��ʼ�ź�* @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�����ź�* @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�ȴ�ȷ���ź�* @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;}}SCL_Output(0);SDA_Output_Mode();delay1(DELAY_TIME);return SUCCESS;
}/*** @brief I2C����ȷ���ź�* @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���ͷ�ȷ���ź�* @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����һ���ֽ�* @param cSendByte ��Ҫ���͵��ֽ�* @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����һ���ֽ�* @param None* @retval ���յ����ֽ�*/
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);
}//读的过程:启动->写入写操作指令0xA0->等待回应->写入存储地址->等待回应 
//          重新启动->写入读操作指令0xA1->等待回应->读取数据->等待回应->停止
uchar eeprom_read(uchar addr)//eeprom读取
{uchar data;I2CStart();I2CSendByte(0xA0);			I2CWaitAck();I2CSendByte(addr);I2CWaitAck();I2CStop();I2CStart();I2CSendByte(0xa1);I2CWaitAck();data=I2CReceiveByte();I2CWaitAck();I2CStop();return data;
}//写的过程:启动->写入写操作指令0xA0->等待回应->写入存储地址->等待回应->写入数据->等待回应->停止
void eeprom_write(uchar addr,uchar data)//eeprom写入
{I2CStart();I2CSendByte(0xA0);I2CWaitAck();I2CSendByte(addr);I2CWaitAck();I2CSendByte(data);I2CWaitAck();I2CStop();
}

main.c

/* USER CODE BEGIN Header */
/********************************************************************************* @file           : main.c* @brief          : Main program body******************************************************************************* @attention** Copyright (c) 2024 STMicroelectronics.* All rights reserved.** This software is licensed under terms that can be found in the LICENSE file* in the root directory of this software component.* If no LICENSE file comes with this software, it is provided AS-IS.********************************************************************************/
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "tim.h"
#include "gpio.h"/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include "lcd.h"
#include "interrupt.h"
#include "i2c_hal.h"
/* USER CODE END Includes */
void disp_pro(void);
void IIC_pro(void);
void key_pro(void);
extern struct keys key[4];
extern uint frq1,frq2;//频率
/* 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 ---------------------------------------------------------*//* USER CODE BEGIN PV *//* USER CODE END PV *//* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
/* USER CODE BEGIN PFP *//* 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_TIM3_Init();MX_TIM2_Init();MX_TIM4_Init();/* USER CODE BEGIN 2 */HAL_TIM_Base_Start_IT(&htim4);HAL_TIM_IC_Start_IT(&htim2,TIM_CHANNEL_1);//打开定时器2、3的通道1HAL_TIM_IC_Start_IT(&htim3,TIM_CHANNEL_1);LCD_Init();//LCD的初始化  LCD_Clear(Black);LCD_SetBackColor(Black);LCD_SetTextColor(White);/* USER CODE END 2 *//* Infinite loop *//* USER CODE BEGIN WHILE */while (1){key_pro();disp_pro();HAL_Delay(100);/* 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};/** 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_HSE;RCC_OscInitStruct.HSEState = RCC_HSE_ON;RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;RCC_OscInitStruct.PLL.PLLM = RCC_PLLM_DIV3;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();}
}/* USER CODE BEGIN 4 */
void IIC_pro(void)
{uchar frq1_h=frq1>>8;   //高8位uchar frq1_l=frq1&0xFF; //低8位 uchar frq2_h=frq2>>8;   //高8位uchar frq2_l=frq2&0xFF; //低8位 eeprom_write(1,frq1_h);//写入高8位HAL_Delay(10);		  //写入需要时间eeprom_write(2,frq1_l);//写入低8位HAL_Delay(10);		  //写入需要时间eeprom_write(3,frq2_h);//写入高8位HAL_Delay(10);		  //写入需要时间eeprom_write(4,frq2_l);//写入低8位
}void key_pro(void)
{if(key[1].single_flag==1){IIC_pro();key[1].single_flag=0;}
}void disp_pro(void)
{char temp[30];sprintf(temp,"  frq1=%d           ",frq1);LCD_DisplayStringLine(Line0, (uchar *)temp);sprintf(temp,"  frq2=%d           ",frq2);LCD_DisplayStringLine(Line2, (uchar *)temp);uint eep_temp1=(eeprom_read(1)<<8)+eeprom_read(2);sprintf(temp,"  frq1_eep=%d           ",eep_temp1);LCD_DisplayStringLine(Line4, (uchar *)temp);uint eep_temp2=(eeprom_read(3)<<8)+eeprom_read(4);sprintf(temp,"  frq2_eep=%d           ",eep_temp2);LCD_DisplayStringLine(Line6, (uchar *)temp);
}
/* 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 */