24LC128 EEPROM存储器的STM32 IIC驱动程序

#include "IIC.h" static uint8_t I2C1Status = 0,I2C2Status = 0,I2C3Status = 0; void I2CxPinDeInit(I2C_TypeDef* I2Cx) { GPIO_InitTypeDef GPIO_InitStruct; GPIO_InitStruct.GPIO_Mode = GPIO_Mode_OUT; GPIO_InitStruct.GPIO_OType = GPIO_OType_PP; GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_InitStruct.GPIO_Speed = GPIO_Speed_2MHz; if(I2Cx == I2C1) { } else if(I2Cx == I2C2) { } else if(I2Cx == I2C3) { GPIO_InitStruct.GPIO_Pin = GPIO_Pin_8; RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE); GPIO_Init(GPIOA,&GPIO_InitStruct); GPIO_SetBits(GPIOA,GPIO_Pin_8); GPIO_InitStruct.GPIO_Pin = GPIO_Pin_9; RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC,ENABLE); GPIO_Init(GPIOC,&GPIO_InitStruct); GPIO_SetBits(GPIOC,GPIO_Pin_8); } else return; } void I2CxPinInit(I2C_TypeDef* I2Cx) { GPIO_InitTypeDef GPIO_InitStruct; GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStruct.GPIO_OType = GPIO_OType_OD; GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_InitStruct.GPIO_Speed = GPIO_Speed_2MHz; if(I2Cx == I2C1) { } else if(I2Cx == I2C2) { } else if(I2Cx == I2C3) { GPIO_InitStruct.GPIO_Pin = GPIO_Pin_8; RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE); GPIO_Init(GPIOA,&GPIO_InitStruct); GPIO_PinAFConfig(GPIOA,GPIO_PinSource8,GPIO_AF_I2C3); GPIO_InitStruct.GPIO_Pin = GPIO_Pin_9; RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC,ENABLE); GPIO_Init(GPIOC,&GPIO_InitStruct); GPIO_PinAFConfig(GPIOC,GPIO_PinSource9,GPIO_AF_I2C3); } else return; } void I2CxInit(I2C_TypeDef* I2Cx) { I2C_InitTypeDef I2C_InitStruct; I2C_InitStruct.I2C_Mode = I2C_Mode_I2C; I2C_InitStruct.I2C_ClockSpeed = 400000; I2C_InitStruct.I2C_DutyCycle = I2C_DutyCycle_16_9; I2C_InitStruct.I2C_Ack = I2C_Ack_Enable; I2C_InitStruct.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit; I2C_InitStruct.I2C_OwnAddress1 = 0x00; if(I2Cx == I2C1) RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1,ENABLE); else if(I2Cx == I2C2) RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C2,ENABLE); else if(I2Cx == I2C3) RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C3,ENABLE); I2CxPinDeInit(I2Cx); I2C_SoftwareResetCmd(I2Cx,ENABLE); I2C_SoftwareResetCmd(I2Cx,DISABLE); I2C_Init(I2Cx,&I2C_InitStruct); I2CxPinInit(I2Cx); I2C_Cmd(I2Cx,ENABLE); } uint8_t I2CxGetRunStatus(I2C_TypeDef* I2Cx) { if(I2Cx == I2C1) return I2C1Status; else if(I2Cx == I2C2) return I2C2Status; else if(I2Cx == I2C3) return I2C3Status; else return 0xFF; } uint8_t I2CxWriteBuf(I2C_TypeDef* I2Cx,uint8_t SlaveAddr,uint16_t RegAddr,uint8_t RegAddrSize,uint8_t *pBuf,uint16_t Lenth) { uint16_t I2CTimeOut = I2CTimeOutValue; uint8_t ErrorCode = 0; if(I2Cx == I2C1) I2C1Status = 1; else if(I2Cx == I2C2) I2C2Status = 1; else if(I2Cx == I2C3) I2C3Status = 1; else return 0xFF; while(I2C_GetFlagStatus(I2Cx,I2C_FLAG_BUSY)) I2CxInit(I2Cx); I2C_GenerateSTART(I2Cx,ENABLE); while(I2C_CheckEvent(I2Cx,I2C_EVENT_MASTER_MODE_SELECT) == RESET) { if((I2CTimeOut --) == 0) { ErrorCode = 1; goto Error; } } I2CTimeOut = I2CTimeOutValue; I2C_Send7bitAddress(I2Cx,SlaveAddr,I2C_Direction_Transmitter); while(I2C_CheckEvent(I2Cx,I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED) == RESET) { if((I2CTimeOut --) == 0) { ErrorCode = 2; goto Error; } } if(RegAddrSize) { I2C_SendData(I2Cx,RegAddr >> 8); I2CTimeOut = I2CTimeOutValue; while(I2C_CheckEvent(I2Cx,I2C_EVENT_MASTER_BYTE_TRANSMITTED) == RESET) { if((I2CTimeOut --) == 0) { ErrorCode = 3; goto Error; } } } I2C_SendData(I2Cx,RegAddr & 0xFF); I2CTimeOut = I2CTimeOutValue; while(I2C_CheckEvent(I2Cx,I2C_EVENT_MASTER_BYTE_TRANSMITTED) == RESET) { if((I2CTimeOut --) == 0) { ErrorCode = 3; goto Error; } } for(uint32_t i = 0;i < Lenth;i ++) { I2C_SendData(I2Cx,pBuf[i]); I2CTimeOut = I2CTimeOutValue; while(I2C_CheckEvent(I2Cx,I2C_EVENT_MASTER_BYTE_TRANSMITTED) == RESET) { if((I2CTimeOut --) == 0) { ErrorCode = 4; goto Error; } } } Error: I2C_GenerateSTOP(I2Cx,ENABLE); if(I2Cx == I2C1) I2C1Status = 0; else if(I2Cx == I2C2) I2C2Status = 0; else if(I2Cx == I2C3) I2C3Status = 0; else return 0xFF; return ErrorCode; } uint8_t I2CxReadBuf(I2C_TypeDef* I2Cx,uint8_t SlaveAddr,uint16_t RegAddr,uint8_t RegAddrSize,uint8_t *pBuf,uint16_t Lenth) { uint16_t I2CTimeOut = I2CTimeOutValue; uint8_t ErrorCode = 0; if(I2Cx == I2C1) I2C1Status = 1; else if(I2Cx == I2C2) I2C2Status = 1; else if(I2Cx == I2C3) I2C3Status = 1; else return 0xFF; while(I2C_GetFlagStatus(I2Cx,I2C_FLAG_BUSY)) I2CxInit(I2Cx); I2C_GenerateSTART(I2Cx,ENABLE); while(I2C_CheckEvent(I2Cx,I2C_EVENT_MASTER_MODE_SELECT) == RESET) { if((I2CTimeOut --) == 0) { ErrorCode = 1; goto Error; } } I2CTimeOut = I2CTimeOutValue; I2C_Send7bitAddress(I2Cx,SlaveAddr,I2C_Direction_Transmitter); while(I2C_CheckEvent(I2Cx,I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED) == RESET) { if((I2CTimeOut --) == 0) { ErrorCode = 2; goto Error; } } if(RegAddrSize) { I2C_SendData(I2Cx,RegAddr >> 8); I2CTimeOut = I2CTimeOutValue; while(I2C_CheckEvent(I2Cx,I2C_EVENT_MASTER_BYTE_TRANSMITTED) == RESET) { if((I2CTimeOut --) == 0) { ErrorCode = 3; goto Error; } } } I2C_SendData(I2Cx,RegAddr & 0xFF); I2CTimeOut = I2CTimeOutValue; while(I2C_CheckEvent(I2Cx,I2C_EVENT_MASTER_BYTE_TRANSMITTED) == RESET) { if((I2CTimeOut --) == 0) { ErrorCode = 3; goto Error; } } I2CTimeOut = I2CTimeOutValue; I2C_GenerateSTART(I2Cx,ENABLE); while(I2C_CheckEvent(I2Cx,I2C_EVENT_MASTER_MODE_SELECT) == RESET) { if((I2CTimeOut --) == 0) { ErrorCode = 4; goto Error; } } I2CTimeOut = I2CTimeOutValue; I2C_Send7bitAddress(I2Cx,SlaveAddr,I2C_Direction_Receiver); while(I2C_CheckEvent(I2Cx,I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED) == RESET) { if((I2CTimeOut --) == 0) { ErrorCode = 5; goto Error; } } for(uint32_t i = 0;i < Lenth;i ++) { if((Lenth - i) == 1) { I2C_AcknowledgeConfig(I2Cx,DISABLE); // I2C_GenerateSTOP(I2Cx,ENABLE); } I2CTimeOut = I2CTimeOutValue; while(I2C_CheckEvent(I2Cx,I2C_EVENT_MASTER_BYTE_RECEIVED) == RESET) { if((I2CTimeOut --) == 0) { ErrorCode = 6; goto Error; } } pBuf[i] = I2C_ReceiveData(I2Cx); } Error: I2C_GenerateSTOP(I2Cx,ENABLE); I2C_AcknowledgeConfig(I2Cx,ENABLE); if(I2Cx == I2C1) I2C1Status = 0; else if(I2Cx == I2C2) I2C2Status = 0; else if(I2Cx == I2C3) I2C3Status = 0; else return 0xFF; return ErrorCode; }