aht20例程(2).zip

#include "MYI2C.h" MYI2C_Struct SENx; /********************************************** //MYI2C_Delay_us **********************************************/ void MYI2C_Delay_us(unsigned long nTim) { unsigned int i; while(nTim--) { i=MYI2C_delay_us_cnt; while(i--); } } /******************************************************************************* * Function Name : MYI2C_GPIO_MODE * Description : Configures the different GPIO ports. * Input : None * Output : None * Return : None *******************************************************************************/ void MYI2C_GPIO_MODE(unsigned char TYP) //根据MCU修改相应的IO初始化 { #ifdef ARM32 GPIO_InitTypeDef GPIO_InitStruct; #endif switch(TYP) { case SDA_OUT://设置开漏输出,需要加外部上拉电阻 #ifdef ARM32 GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_OD; GPIO_InitStruct.GPIO_Pin =SDA_Pin; GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(IIC_SDA_PORT, &GPIO_InitStruct); #else P0M0 |= 1<<3; P0M1 |= 3<<2; #endif break; case SDA_IN://设置输入,需要加外部上拉电阻 #ifdef ARM32 GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IPU; GPIO_InitStruct.GPIO_Pin =SDA_Pin; GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(IIC_SDA_PORT, &GPIO_InitStruct); #else P0M0 &= ~(1<<3); P0M1 |= 3<<2; #endif break; case SCL_OUT://设置开漏输出,需要加外部上拉电阻 #ifdef ARM32 GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_OD; GPIO_InitStruct.GPIO_Pin =SCL_Pin; GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(IIC_SCL_PORT, &GPIO_InitStruct); #else P0M0 |= 1<<2; P0M1 |= 3<<2; #endif break; } } /******************************************************************************* * Function Name : MYI2C_GPIO_DATA * Description : Configures the different GPIO ports. * Input : None * Output : None * Return : None *******************************************************************************/ unsigned char MYI2C_GPIO_DATA(unsigned char TYP)//根据MCU修改相应的IO操作 { unsigned int dat=0; switch(TYP) { case SDA_H: #ifdef ARM32 GPIO_SetBits(IIC_SDA_PORT,SDA_Pin); #else I2C_SDA_PIN = 1; #endif break; case SDA_L: #ifdef ARM32 GPIO_ResetBits(IIC_SDA_PORT,SDA_Pin); #else I2C_SDA_PIN = 0; #endif break; case SCL_H: #ifdef ARM32 GPIO_SetBits(IIC_SCL_PORT,SCL_Pin); #else I2C_SCL_PIN = 1; #endif break; case SCL_L: #ifdef ARM32 GPIO_ResetBits(IIC_SCL_PORT,SCL_Pin); #else I2C_SCL_PIN = 0; #endif break; case SDA_R: #ifdef ARM32 dat=GPIO_ReadInputDataBit(IIC_SDA_PORT,SDA_Pin); #else dat=I2C_SDA_PIN; #endif break; } return dat; } /********************************************** //IIC Start **********************************************/ void MYI2C_IIC_Start(void) { MYI2C_SCK_Set(); MYI2C_SDA_Set(); MYI2C_SDA_Clr(); MYI2C_SCK_Clr(); } /********************************************** //IIC Stop **********************************************/ void MYI2C_IIC_Stop(void) { MYI2C_SCK_Clr(); MYI2C_SDA_Clr(); MYI2C_SCK_Set(); MYI2C_SDA_Set(); } /********************************************** //IIC Ack **********************************************/ void MYI2C_IIC_Ack(unsigned char ack) { MYI2C_SCK_Clr(); if(ack) { MYI2C_SDA_Clr(); } else { MYI2C_SDA_Set(); } MYI2C_SCK_Set(); } /********************************************** //IIC Wait_Ack **********************************************/ unsigned char MYI2C_IIC_Wait_Ack(unsigned int wait_time) { MYI2C_SCK_Clr(); MYI2C_SDA_IN_Mode; MYI2C_SDA_Set(); MYI2C_SCK_Set(); while(wait_time) { if(MYI2C_GPIO_DATA(SDA_R)==0)break; MYI2C_Delay_us(1); wait_time--;//======================= } MYI2C_SDA_OD_Mode; return wait_time;//是否应答======================= } /********************************************** // IIC Write byte **********************************************/ void MYI2C_Write_IIC_Byte(unsigned char dat) { unsigned char i; for(i=0;i<8;i++) { MYI2C_SCK_Clr(); if(dat&0x80) { MYI2C_SDA_Set(); } else { MYI2C_SDA_Clr(); } MYI2C_SCK_Set(); dat=dat<<1; } } /********************************************** // IIC Read byte **********************************************/ unsigned char MYI2C_Read_IIC_Byte(void) { unsigned char i,byt=0; MYI2C_SCK_Clr(); MYI2C_SDA_IN_Mode; MYI2C_SDA_Set(); for(i=0;i<8;i++) { MYI2C_SCK_Clr(); if(MYI2C_GPIO_DATA(SDA_R))byt++; MYI2C_SCK_Set(); if(i<7)byt=byt<<1; } MYI2C_SDA_OD_Mode; return byt; } /******************************************************************************* * Function Name : MYI2C_Init * Description : 初始化MYI2C * Input : None * Output : None * Return :None *******************************************************************************/ void MYI2C_Init(MYI2C_Struct *pst,unsigned int ReadTimMS,unsigned char xAddr) { RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE); //使能SDA、SCL端口时钟，如是51单片机不需要则注释掉该行。 pst->Adrr=xAddr; pst->Step=SENSOR_IDLE; if(ReadTimMS>MinReadTim)pst->SetRTim=ReadTimMS; else pst->SetRTim=MinReadTim; MYI2C_SCK_OD_Mode; MYI2C_SDA_OD_Mode; MYI2C_SCK_Set(); MYI2C_SDA_Set(); } /******************************************************************************* * Function Name : * Description : * Input :None * Output :None * Return :None *******************************************************************************/ unsigned char MYI2C_READ_FUNC(MYI2C_Struct *pst,unsigned char device_addr,unsigned char register_addr,unsigned char *pDat,unsigned char len) { unsigned char NoAck=0; if(register_addr) { /* Send STRAT condition a second time */ MYI2C_IIC_Start(); /* Send slave address for Write Regsiter */ MYI2C_Write_IIC_Byte((device_addr<<1) + 0); /* Ack */ if(MYI2C_IIC_Wait_Ack(Wait_Ack_time)==0)NoAck++; /*Send register_addr*/ MYI2C_Write_IIC_Byte((register_addr)); /* Ack */ if(MYI2C_IIC_Wait_Ack(Wait_Ack_time)==0)NoAck++; // MYI2C_IIC_Stop(pst); MYI2C_SCK_Clr(); MYI2C_SCK_Set(); } /* Send STRAT condition a second time */ MYI2C_IIC_Start(); /* Send slave address for Read */ MYI2C_Write_IIC_Byte((device_addr<<1)+1 ); /* Ack */ if(MYI2C_IIC_Wait_Ack(Wait_Ack_time)==0)NoAck++; /* While there is data to be read */ while(len && NoAck==0 && len<MYI2C_Buffer_Size) // { *pDat=MYI2C_Read_IIC_Byte(); /* Ack */ MYI2C_IIC_Ack(len-1);//len = 1 NoAck pDat++; len--; } /* Send STOP Condition */ MYI2C_IIC_Stop(); pst->ErrFlag=NoAck; return NoAck; } /******************************************************************************* * Function Name : * Description : * Input : None * Output : None * Return :None *******************************************************************************/ unsigned char MYI2C_WRITE_FUNC(MYI2C_Struct *pst,unsigned char device_addr,unsigned char register_addr,unsigned char *pDat,unsigned char len) { unsigned int NoAck=0; /* Send STRAT condition */ MYI2C_IIC_Start(); /* Send slave address for write */ MYI2C_Write_IIC_Byte((device_addr<<1) + 0); /* ACK */ if(MYI2C_IIC_Wait_Ack(Wait_Ack_time)==0)NoAck++; /* Send register_addr for read */ MYI2C_Write_IIC_Byte((register_addr)); /* ACK */ if(MYI2C_IIC_Wait_Ack(Wait_Ack_time)==0)NoAck++; while(