STM32G431RBTx 基本模块 I2C M24C02

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STMCU小助手发布时间：2023-3-1 22:25

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文章简介:	STM32G431RBTx 基本模块 I2C M24C02

前言G4板载了一块M24C02(eeprom)和一块MCP4017(可编程电阻)，省赛中多考M24C02，本篇文章讲述如何用软件I2驱动M24C02。I2C1.原理图以及配置元素

分析:由图可知，PB6为I2C的SCL线，PB7为I2C的SDA线2.CubeMx的配置步骤

大赛是提供了I2C的驱动的这里我们只需要把两个引脚设置输出模式就行了，不再需要其他步骤。3.生成工程

将红框中的两个文件复制黏贴到工程文件夹中的bsp文件夹中并改名为i2c.c和i2c.h。

在bsp文件中新建i2cc.c和i2c.h文件打开工程将两个文件添加到工程中去

至此工程就建立完毕了4.测试代码i2c.h:

#ifndef __I2C_H
#define __I2C_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);
/*******下方为自己添加的函数声明**************/
unsigned char eeprom_read(unsigned char addr);
void eeprom_write(unsigned char addr, unsigned char dat);
#endif

复制代码

i2c.c:

#include "i2c.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);
}
/**************以上是大赛提供的驱动**************************/
/***********以下是自己写的对24C02的读写操作******************/
unsigned char eeprom_read(unsigned char addr)
{
unsigned char dat;
I2CStart();
I2CSendByte(0xa0);
I2CWaitAck();
I2CSendByte(addr);
I2CWaitAck();
I2CStop();
I2CStart();
I2CSendByte(0xa1);
I2CWaitAck();
dat = I2CReceiveByte();
I2CWaitAck();
I2CStop();
return dat;
}
void eeprom_write(unsigned char addr, unsigned char dat)
{
I2CStart();
I2CSendByte(0xa0);
I2CWaitAck();
I2CSendByte(addr);
I2CWaitAck();
I2CSendByte(dat);
I2CWaitAck();
I2CStop();
}

复制代码

main.c:

/* USER CODE BEGIN Header */
/**
******************************************************************************
* @file : main.c
* @brief : Main program body
******************************************************************************
* @attention
*
*
* 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 "gpio.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include "lcd.h"
#include "badc.h"
#include "stdio.h"
#include "i2c.h"
#include "interrupt.h"
/* USER CODE END Includes */
/* 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 */
extern struct keys key[4];
unsigned char adc1_L, adc1_H;
/* 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_TIM16_Init();
MX_TIM17_Init();
MX_ADC1_Init();
MX_ADC2_Init();
/* USER CODE BEGIN 2 */
LCD_Init();
LCD_Clear(Black);
LCD_SetBackColor(Black);
LCD_SetTextColor(White);
HAL_TIM_Base_Start_IT(&htim3);
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
char text[30];
unsigned int adc1, adc2;
adc1 = getADC(&hadc1);
sprintf(text, " V1:%.2f", adc1 * 3.3 / 4096);
LCD_DisplayStringLine(Line4, (unsigned char *)text);
adc2 = getADC(&hadc2);
sprintf(text, " V2:%.2f", adc2 * 3.3 / 4096);
LCD_DisplayStringLine(Line5, (unsigned char *)text);
if(key[0].single_flag) //短按写入
{
adc1_L = adc1 & 0xff;
adc1_H = adc1 >> 8;
eeprom_write(1, adc1_L);
HAL_Delay(10);
eeprom_write(2, adc1_H);
key[0].single_flag = 0;
}
if(key[0].long_flag) //长按读出
{
char text[30];
unsigned int eep_temp = (eeprom_read(2) << 8) + eeprom_read(1);
sprintf(text, " ADC_eep=%.2f", eep_temp * 3.3 / 4096);
LCD_DisplayStringLine(Line8, (unsigned char *)text);
key[0].long_flag = 0;
}
}
/* 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_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();
}
/** Initializes the peripherals clocks
*/
PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_ADC12;
PeriphClkInit.Adc12ClockSelection = RCC_ADC12CLKSOURCE_SYSCLK;
if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
{
Error_Handler();
}
}
/* 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****/