STM32F030硬件i2c驱动

/***************************** * Copyright (C), 2015, 深圳市泰和安科技有限公司 * 文件名称: iic.c * 文件描述: 用于驱动FT24c02 * 作 者: Riven * 建立时间: 2017.10.16 * 版 本: 0.1 ****************************/ /**************** FT24C02A 8位数据地址 16字节页写模式 共有16页,每页16个字节共256个字节 写之前自动擦除 写保护由硬件引脚控制 SCL上升沿时数据被锁存到flash中 写保护引脚低电平写使能 DriverAddr:1010+EEPROM芯片的3bit编码（000~111）+1（写）/0（读） 本程序仅一片EEprom,故芯片编号使用000，所以写操作芯片地址DRIVER_WADDR为10100001即0XA1,读操作地址DRIVER_RADDR为10100000，即0XA0; **********************/ //注意：使用IIC写函数后续延时至少5ms #include "iic.h" #include "delay.h" #include "string.h" static void IIC_GPIO_Configuration(void); static void IIC_Mode_Configuration(void); void IIC_Init(void); uint8_t EE_WritePage(uint8_t DriverAddr,uint8_t WriteAddr,uint8_t nByte,uint8_t *pBuffer); uint8_t EE_ReadNByte(uint8_t DriverAddr, uint8_t ReadAddr, uint8_t nByte, uint8_t *pBuffer); /** * @brief IIC初始化 * @param 无 * @retval 无 */ void iic_init(void) { IIC_GPIO_Configuration(); IIC_Mode_Configuration(); } /** * @brief IIC引脚配置 * @param 无 * @retval 无 */ static void IIC_GPIO_Configuration(void) { GPIO_InitTypeDef GPIO_InitStruct; // RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOF,ENABLE); GPIO_InitStruct.GPIO_Pin = IIC_GPIO_SCL | IIC_GPIO_SDA; GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStruct.GPIO_OType = GPIO_OType_OD; GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL; //硬件接上拉电阻 GPIO_InitStruct.GPIO_Speed = GPIO_Speed_Level_3; GPIO_Init(IIC_GPIO_PORT,&GPIO_InitStruct); GPIO_PinAFConfig(IIC_GPIO_PORT, GPIO_PinSource6, GPIO_AF_1); GPIO_PinAFConfig(IIC_GPIO_PORT, GPIO_PinSource7, GPIO_AF_1); } /** * @brief IIC工作参数配置 * @param 无 * @retval 无 */ static void IIC_Mode_Configuration(void) { I2C_InitTypeDef I2C_InitStruct; RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C2,ENABLE); I2C_Cmd(I2C2, DISABLE); I2C_InitStruct.I2C_Mode = I2C_Mode_I2C; I2C_InitStruct.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit; I2C_InitStruct.I2C_AnalogFilter = I2C_AnalogFilter_Enable; I2C_InitStruct.I2C_DigitalFilter = 0x00; I2C_InitStruct.I2C_Ack = I2C_Ack_Enable; I2C_InitStruct.I2C_OwnAddress1 = 0XA5; I2C_InitStruct.I2C_Timing = 0x00210507; //SDADEL有差别 0x00210507 I2C_Init(I2C2,&I2C_InitStruct); I2C_Cmd(I2C2, ENABLE); } /** * @brief IIC页写 * @param DriverAddr 设备地址，即flash的地址 * @param WriteAddr 数据地址 * @param nByte 写入的字节数，最大不能超过一页16byte * @param pBuff 写入的数据 * @retval 0 成功 * 1 失败 */ uint8_t EE_WritePage(uint8_t DriverAddr,uint8_t WriteAddr,uint8_t nByte,uint8_t *pBuffer) { uint8_t WriteByte = 0; uint8_t TimeOut = 0; // IIC_CP_LOW;//写保护失能 /* 1.等待空闲 */ TimeOut = TIMEOUT; while(I2C_GetFlagStatus(I2C2, I2C_FLAG_BUSY) != RESET) { if((TimeOut--) == 0) { return 1; } } /* 2.开启写模式 ，Transmit data register empty */ TimeOut = TIMEOUT; I2C_TransferHandling(I2C2, DriverAddr, 1,I2C_Reload_Mode, I2C_Generate_Start_Write);//I2C_SoftEnd_Mode while(I2C_GetFlagStatus(I2C2, I2C_FLAG_TXIS) == RESET) { if((TimeOut--) == 0) { return 1; } } /* 3.发送数据地址,Transfer complete reload */ I2C_SendData(I2C2, WriteAddr); TimeOut = TIMEOUT; while(I2C_GetFlagStatus(I2C2, I2C_FLAG_TCR) == RESET) { if((TimeOut--) == 0) { return 1; } } /* 4.连续发送数据 */ I2C_TransferHandling(I2C2, DriverAddr, nByte, I2C_AutoEnd_Mode, I2C_No_StartStop); for(WriteByte = 0; WriteByte < nByte; WriteByte++) { TimeOut = TIMEOUT; while(I2C_GetFlagStatus(I2C2, I2C_FLAG_TXIS) == RESET) { if((TimeOut--) == 0) { return 1; } } I2C_SendData(I2C2, pBuffer[WriteByte]); } /* 5.STOP detection flag */ TimeOut = TIMEOUT; while(I2C_GetFlagStatus(I2C2, I2C_FLAG_STOPF) == RESET) { if((TimeOut--) == 0) { return 1; } } delay_nus(DELAY_TIME); return 0; } /** * @brief 从EEPROM中读取N个字节 * @param DriverAddr 设备地址，即flash的地址 * @param ReadAddr 数据地址 * @param nByte 读取的字节数 * @param pBuffer 读取的数据 * @retval 0 成功 * 1 失败 */ uint8_t EE_ReadNByte(uint8_t DriverAddr, uint8_t ReadAddr, uint8_t nByte, uint8_t *pBuffer) { uint8_t ReadByte = 0; uint8_t TimeOut = 0; // IIC_CP_LOW;//写保护失能 /* 1.等待空闲 */ TimeOut = TIMEOUT; while(I2C_GetFlagStatus(I2C2, I2C_FLAG_BUSY) != RESET) { if((TimeOut--) == 0) { return 1; } } // delay_nus(Delay_Nk); /* 2.开启读模式 */ I2C_TransferHandling(I2C2, DriverAddr, 1,I2C_SoftEnd_Mode, I2C_Generate_Start_Write); //I2C_Reload_Mode TimeOut = TIMEOUT; while(I2C_GetFlagStatus(I2C2, I2C_FLAG_TXIS) == RESET) { if((TimeOut--) == 0) { return 1; } } /* 3.发送数据地址 */ I2C_SendData(I2C2, ReadAddr); TimeOut = TIMEOUT; while(I2C_GetFlagStatus(I2C2, I2C_FLAG_TC) == RESET) { if((TimeOut--) == 0) { return 1; } } /* 4.连续接收数据 */ I2C_TransferHandling(I2C2, DriverAddr, nByte, I2C_AutoEnd_Mode, I2C_Generate_Start_Read); for(ReadByte = 0; ReadByte < nByte; ReadByte++) { TimeOut = TIMEOUT; while(I2C_GetFlagStatus(I2C2, I2C_FLAG_RXNE) == RESET) { if((TimeOut--) == 0) { return 1; } } pBuffer[ReadByte] = I2C_ReceiveData(I2C2); } /* 5.STOP detection flag */ TimeOut = TIMEOUT; while(I2C_GetFlagStatus(I2C2, I2C_FLAG_STOPF) == RESET) { if((TimeOut--) == 0) { return 1; } } delay_nus(DELAY_TIME); return 0; } void test_iic(void) { uint8_t i; uint8_t ret = 0; uint8_t addr[16] = {0x00,0x10,0x20,0x30,0x40,0x50,0x60,0x70,0x80,0x90,0xA0,0xB0,0Xc0,0Xd0,0xe0,0xF0}; uint8_t send_buff[16] = {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16}; uint8_t rec_buff[16] = {0}; for( i = 0; i < 16;i++) { ret = EE_WritePage(DRIVER_RADDR,addr[i],16, send_buff); if(ret == 1) break; } for(i = 0; i < 16;i++) { EE_ReadNByte(DRIVER_RADDR,addr[i], 16, rec_buff); memset(rec_buff,0,16); } }