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/*******************************************************************************
*Filename: sht30_dis.c
*Revised: $Date: 06-15 15:23 $
*Author: double
*Description: 溫濕度傳感器驅(qū)動
*******************************************************************************
*************************引腳配置**********************************************
*******************************************************************************
*
* --------------------
* | PB7 |--> SCL
* | PB6 |--> SDA
* --------------------
*******************************************************************************/
#include "sht30_dis.h"
unsigned char TemValue = 0;
unsigned char RhValue = 0;
unsigned char buffer[6];
//IIC所有操作函數(shù)
//void IIC_Init(void); //初始化IIC的IO口
void SCL_L(void);
void SCL_H(void);
void SDA_L(void);
void SDA_H(void);
unsigned char SDA_Read(void);
void i2c_delay(void);
void i2c_noAck(void);
void i2c_ack(void);
void i2c_stop(void);
void i2c_delay(void);
unsigned char i2c_star(void);
unsigned char i2c_waitAck(void);
void i2c_sendByte( unsigned char byte );
unsigned char i2c_readByte(void);
void SHT3X_WriteCMD(unsigned int cmd);
void SHT3X_ReadState(unsigned char *temp);
void SHT3X_SetPeriodicMeasurement(void);
void SHX3X_ReadResults(unsigned int cmd, unsigned char *p);
unsigned char SHT3X_CalcCrc(unsigned char *data, unsigned char nbrOfBytes);
unsigned char SHT3X_CheckCrc(unsigned char *pdata, unsigned char nbrOfBytes, unsigned char checksum);
unsigned int SHT3X_CalcTemperature(unsigned int rawValue);
unsigned char SHT3X_CalcRH(unsigned int rawValue);
void SHT_GetValue(void);
/*******************************************************************************
* @fn sht30_dis_init
*
* @brief 初始化
*
* @return none
*
******************************************************************************/
void sht30_dis_init(void){
// SCL_OUT();
GPIO_InitTypeDef GPIO_InitStructure;
// __HAL_RCC_GPIOB_CLK_ENABLE();
// HAL_GPIO_WritePin(GPIOB, GPIO_PIN_7, GPIO_PIN_SET);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //推挽輸出
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_SetBits(GPIOB, GPIO_Pin_7);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; //浮空輸入，或者改成上拉輸入
GPIO_Init(GPIOB, &GPIO_InitStructure);
delay_us(250);
SHT3X_SetPeriodicMeasurement();//設(shè)置測量周期和模式
delay_us(150);
SHT_GetValue();
delay_us(150);
}
void SDA_IN(void){
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; //浮空輸入，或者改成上拉輸入
GPIO_Init(GPIOB, &GPIO_InitStructure);
}
void SDA_OUT(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //推挽輸出
GPIO_Init(GPIOB, &GPIO_InitStructure);
}
void SDA_H(void)
{
SDA_OUT();
IIC_SDA_H;
}
void SDA_L(void)
{
SDA_OUT();
IIC_SDA_L;
}
unsigned char SDA_Read(void)
{
SDA_IN();
return READ_SDA;
}
void SCL_H(void)
{
IIC_SCL_H;
}
void SCL_L(void)
{
IIC_SCL_L;
}
void i2c_delay(void)
{
// unsigned int z;
//
// for(z=0;z<10;z++);
//2M時(shí)鐘，一個(gè)指令周期就行。測量速度是20ms讀取完數(shù)據(jù)
__nop();
}
unsigned char i2c_star(void)
{
SDA_H();
SCL_H();
i2c_delay();
if (!SDA_Read())
return 1;
SDA_L();
i2c_delay();
if (SDA_Read())
return 1;
SDA_L();
SCL_L();
i2c_delay();
return 0;
}
void i2c_stop(void)
{
SCL_L();
i2c_delay();
SDA_L();
i2c_delay();
SCL_H();
i2c_delay();
SDA_H();
i2c_delay();
}
void i2c_ack(void)
{
SCL_L();
i2c_delay();
SDA_L();
i2c_delay();
SCL_H();
i2c_delay();
SCL_L();
i2c_delay();
}
void i2c_noAck(void)
{
SCL_L();
i2c_delay();
SDA_H();
i2c_delay();
SCL_H();
i2c_delay();
SCL_L();
i2c_delay();
}
unsigned char i2c_waitAck(void)
{
unsigned char t = 200;
SCL_L();
i2c_delay();
SDA_H();
i2c_delay();
//////////////////////////此處為金句，IO輸入輸出切換的瞬間有抖動，造成異常應(yīng)答
SDA_Read();
//////////////////////////
SCL_H();
i2c_delay();
while( SDA_Read() )
{
t --;
i2c_delay();
if(t==0)
{
SCL_L();
return 1;
}
i2c_delay();
}
i2c_delay();
SCL_L();
i2c_delay();
return 0;
}
void i2c_sendByte( unsigned char byte )
{
unsigned char i = 8;
while (i--) {
SCL_L();
i2c_delay();
if (byte & 0x80)
SDA_H();
else
SDA_L();
byte <<= 1;
i2c_delay();
SCL_H();
i2c_delay();
}
SCL_L();
i2c_delay();
}
unsigned char i2c_readByte(void)
{
unsigned char i = 8;
unsigned char byte = 0;
SDA_H();
SDA_Read();
while (i--)
{
byte <<= 1;
SCL_L();
i2c_delay();
SCL_H();
i2c_delay();
if (SDA_Read())
{
byte |= 0x01;
}
}
SCL_L();
i2c_delay();
return byte;
}
void SHT3X_WriteCMD(unsigned int cmd)
{
i2c_star();
i2c_sendByte(i2cAddWrite_8bit);
i2c_waitAck();
i2c_sendByte(cmd>>8);
i2c_waitAck();
i2c_sendByte(cmd);
i2c_waitAck();
i2c_stop();
}
void SHT3X_SetPeriodicMeasurement(void)
{
SHT3X_WriteCMD(CMD_MEAS_PERI_2_H);
}
//讀取SHT30寄存器狀態(tài)
void SHT3X_ReadState(unsigned char *temp)
{
i2c_star();
i2c_sendByte(i2cAddWrite_8bit);
i2c_waitAck();
i2c_sendByte(0xf3);
i2c_waitAck();
i2c_sendByte(0X2d);
i2c_waitAck();
i2c_star();
i2c_sendByte(i2cAddRead_8bit);
i2c_waitAck();
temp[0] = i2c_readByte();//高
i2c_ack();
temp[1] = i2c_readByte();//低
i2c_ack();
temp[2] = i2c_readByte();//校驗(yàn)
i2c_noAck();
i2c_stop();
}
//讀取SHT30結(jié)果
void SHX3X_ReadResults(unsigned int cmd, unsigned char *p)
{
i2c_star();
i2c_sendByte(i2cAddWrite_8bit);
i2c_waitAck();
i2c_sendByte(cmd>>8);
i2c_waitAck();
i2c_sendByte(cmd);
i2c_waitAck();
i2c_star();
i2c_sendByte(i2cAddRead_8bit);
if(i2c_waitAck()==0){
i2c_delay();
i2c_delay();
i2c_delay();
p[0] = i2c_readByte();//溫度高
i2c_ack();
p[1] = i2c_readByte();//溫度低
i2c_ack();
p[2] = i2c_readByte();//校驗(yàn)
i2c_ack();
p[3] = i2c_readByte();//濕度高
i2c_ack();
p[4] = i2c_readByte();//濕度低
i2c_ack();
p[5] = i2c_readByte();//校驗(yàn)
i2c_noAck();
i2c_stop();
}
}
//校驗(yàn)
unsigned char SHT3X_CalcCrc(unsigned char *data, unsigned char nbrOfBytes)
{
unsigned char bit; // bit mask
unsigned char crc = 0xFF; // calculated checksum
unsigned char byteCtr; // byte counter
// calculates 8-Bit checksum with given polynomial
for(byteCtr = 0; byteCtr < nbrOfBytes; byteCtr++) {
crc ^= (data[byteCtr]);
for(bit = 8; bit > 0; --bit) {
if(crc & 0x80) {
crc = (crc << 1) ^ POLYNOMIAL;
} else {
crc = (crc << 1);
}
}
}
return crc;
}
//校驗(yàn)檢測
unsigned char SHT3X_CheckCrc(unsigned char *pdata, unsigned char nbrOfBytes, unsigned char checksum)
{
unsigned char crc;
crc = SHT3X_CalcCrc(pdata, nbrOfBytes);// calculates 8-Bit checksum
if(crc != checksum)
{
return 1;
}
return 0;
}
//計(jì)算溫度
unsigned int SHT3X_CalcTemperature(unsigned int rawValue)
{
// calculate temperature
unsigned int temp;
temp = (175 * (float)rawValue / 65535 - 45) ; // T = -45 + 175 * rawValue / (2^16-1)
return temp;
}
//計(jì)算濕度
unsigned char SHT3X_CalcRH(unsigned int rawValue)
{
// calculate relative humidity [%RH]
unsigned char temp1 = (100 * (float)rawValue / 65535) ; // RH = rawValue / (2^16-1) * 10
return temp1;
}
//讀取溫度---20ms即可讀取完成
void SHT_GetValue(void)
{
unsigned char temp = 0;
unsigned int dat;
unsigned char p[3];
unsigned char cnt;
unsigned char tem_status,hum_status;
cnt = 0;
tem_status = 0;
hum_status = 0;
while(cnt++<2){
SHX3X_ReadResults(CMD_FETCH_DATA, buffer);//獲取溫度濕度
p[0] = buffer[0];
p[1] = buffer[1];
……………………
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