SI7021.rar_1J8_SI7021 STM32程序_i2c stm32_si7021 stm32_si7021与st

/************************Copyright (c)******************************** ** PP-DIY **------------------------File Info------------------------------------ ** File name: si702x.c ** Created by：　　　　 P.P　 ** Last modified Date: 2014-10-3 ** Descriptions:　 ***************************************************************************/ #include "SI7021.h" #include "stdio.h" float Temp_buf; float Humi_buf; struct SI70XX_TYPE SI70XX; //======================================== //FUNCTION:ROUTES TO PROVIDE A START SIGNAL //======================================== void SI_IO_Init(void) { GPIO_InitTypeDef GPIO_InitStructure; RCC_AHB1PeriphClockCmd(SI7021_RCC,ENABLE); GPIO_InitStructure.GPIO_Pin=SI7021_PIN; GPIO_InitStructure.GPIO_Mode=GPIO_Mode_OUT; GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_OType=GPIO_OType_PP; GPIO_InitStructure.GPIO_PuPd=GPIO_PuPd_NOPULL; GPIO_Init(SI7021_GPIO, &GPIO_InitStructure); SI7021_CLK_H; SI7021_SDA_H; SI7021_POWER_ON; } void SI_start(void) { SI7021_SDA_OUT; SI7021_CLK_L; SI7021_IIC_Delay(); SI7021_SDA_H; SI7021_IIC_Delay(); SI7021_CLK_H; SI7021_IIC_Delay(); SI7021_SDA_L; SI7021_IIC_Delay(); SI7021_CLK_L; SI7021_IIC_Delay(); return; } //======================================= //FUNCTION:ROUTES TO PROVIDE A STOP SIGNAL //======================================== void SI_stop(void) { SI7021_SDA_OUT; SI7021_SDA_L; SI7021_CLK_L; SI7021_IIC_Delay(); SI7021_CLK_H; SI7021_IIC_Delay(); SI7021_SDA_H; SI7021_IIC_Delay(); SI7021_CLK_L; SI7021_IIC_Delay(); SI7021_SDA_L; return; } //----------------------------------------------------------------------------- // check the acknowledge // // Inputs: // wrdata: Byte to be written // // Pin drive status upon exit: // SDIO = high (open-drain input) // SCLK = high //----------------------------------------------------------------------------- uchar Slave_acknowledge(void) { //check the acknowledge SI7021_SDA_IN; SI7021_SDA_H; SI7021_CLK_L; SI7021_IIC_Delay(); SI7021_CLK_H; SI7021_IIC_Delay(); //while (SI7021_Data);//长时间等待退出 for(uchar i=0;i<254;i++)//容错处理，防止死等 { if(SI7021_Data) { SI7021_IIC_Delay(); } else { break;//直接退出 } if(i==200) { //超时出错 return(1); } } SI7021_CLK_L; SI7021_IIC_Delay(); return(0); } void Master_acknowledge(void) { SI7021_SDA_OUT; SI7021_SDA_L; SI7021_IIC_Delay(); SI7021_CLK_L; SI7021_IIC_Delay(); SI7021_CLK_H; SI7021_IIC_Delay(); SI7021_CLK_L; SI7021_IIC_Delay(); return; } void No_ack(void) { SI7021_SDA_IN; SI7021_IIC_Delay(); SI7021_CLK_L; SI7021_IIC_Delay(); SI7021_CLK_H; SI7021_IIC_Delay(); SI7021_CLK_L; SI7021_IIC_Delay(); return; } /********************************************************************* *函数名称: char SI_R_Byte(uchar ack) *说 明：reads a byte form the Sensibus and gives an acknowledge in case of "ack=1" *********************************************************************/ uchar SI_R_Byte(void) { uchar val=0; SI7021_SDA_IN; //release DATA-line SI7021_CLK_L; for(uchar i=8;i>0;i--) { SI7021_CLK_L; SI7021_IIC_Delay(); SI7021_CLK_H; SI7021_IIC_Delay(); if(SI7021_Data) { val |= 0x01; } if(i!=1) { val<<=1; } } SI7021_CLK_L; return(val); } /********************************************************************* *函数名称: uchar SI_W_Byte(uchar value) *说 明： *********************************************************************/ void SI_W_Byte(uchar value) { SI7021_SDA_OUT; SI7021_CLK_L; for(uchar i=0x80;i>0;i>>=1) //shift bit for masking { if (i & value) { SI7021_SDA_H; //masking value with i , write to SENSI-BUS } else { SI7021_SDA_L; } SI7021_IIC_Delay(); //observe setup time SI7021_CLK_H; //clk for SENSI-BUS SI7021_IIC_Delay(); //pulswith approx. 5 us SI7021_CLK_L; SI7021_IIC_Delay(); SI7021_SDA_L; } return; //error=1 in case of no acknowledge } /****************************************************************************** *函数名称:ucahr s_measure(uchar *p_value, uchar *p_checksum, uchar mode) *说 明:makes a measurement (humidity/temperature) with checksum *******************************************************************************/ uchar SI_Read_Register(uchar Reg_add) { uchar temp=0; //====================================================// SI_start(); SI_W_Byte(0x80); Slave_acknowledge(); SI_W_Byte(Reg_add); Slave_acknowledge(); SI_start(); SI_W_Byte(0x81); Slave_acknowledge(); temp=SI_R_Byte(); Master_acknowledge(); SI_stop(); return(temp); } /****************************************************************************** *函数名称:ucahr s_measure(uchar *p_value, uchar *p_checksum, uchar mode) *说 明:makes a measurement (humidity/temperature) with checksum *******************************************************************************/ uchar SI_Write_Register(uchar Reg_add,uchar Code) { uchar temp=0; //====================================================// SI_start(); SI_W_Byte(0x80); Slave_acknowledge(); SI_W_Byte(Reg_add); Slave_acknowledge(); SI_W_Byte(Code); Slave_acknowledge(); SI_stop(); return(temp); } /*****************************************************************************/ /* SI70XX_Read_UserRegister */ /*****************************************************************************/ uchar SI70XX_Read_UserRegister(void) { uchar Data; SI_start(); SI_W_Byte(0x80);// si7013 Slave_acknowledge(); SI_W_Byte(CMD_READ_REGISTER_1); Slave_acknowledge(); delay_ms(20);//>=20ms等待转换 SI_start(); SI_W_Byte(0x81);//地址读 Slave_acknowledge(); Data=SI_R_Byte(); No_ack(); SI_stop(); return(Data); } #ifndef I2C_SIM unsigned char I2C_Err=0; uint8_t I2C_ReadOneByte(I2C_TypeDef *I2Cx,uint8_t I2C_Addr,uint8_t Reg_addr) { RCC_ClocksTypeDef rcc_clocks; uint8_t readout; u32 tmr; u32 ulTimeOut_Time; RCC_GetClocksFreq(&rcc_clocks); ulTimeOut_Time = (rcc_clocks.SYSCLK_Frequency /10000); tmr = ulTimeOut_Time; while((--tmr)&&I2C_GetFlagStatus(I2Cx, I2C_FLAG_BUSY)); if(tmr==0) I2C_Err = 1; I2C_GenerateSTART(I2Cx, ENABLE); //??I2C?START??,????????????? tmr = ulTimeOut_Time; while((--tmr)&&(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_MODE_SELECT))); if(tmr==0) I2C_Err = 1; I2C_Send7bitAddress(I2Cx,I2C_Addr,I2C_Direction_Transmitter); tmr = ulTimeOut_Time; while((--tmr)&&(!I2C_CheckEvent(I2Cx,I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED))); if(tmr==0) I2C_Err = 1; I2C_SendData(I2Cx, Reg_addr); tmr = ulTimeOut_Time; while((--tmr)&&(!I2C_CheckEvent(I2Cx,I2C_EVENT_MASTER_BYTE_TRANSMITTED))); if(tmr==0) I2C_Err = 1; I2C_GenerateSTART(I2Cx, ENABLE); tmr = ulTimeOut_Time; while((--tmr)&&(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_MO