不废话，上代码：
/********************************************************************************
* @file htu20d.c *
* @brief The Driver code for HTU21D with SWM181CBT6 *
* @version 1.0.0 *
* @date 2018/08/23 01:35:35 *
* *
* @note *
* Copyright (C) 2000-2018 PM9GZY by yuanxihua@21cn.com. All rights reserved. *
********************************************************************************/
/* Includes --------------------------------------------------------------------*/
#include "wall.h"
/*
_________________________________________________
| SWM181CBT6 HTU20D |
| |
| SDA - PD3 <---> SDA |
| SCL - PD2 ---> SCL |
|_______________________________________________|
*/
/* Private typedef -----------------------------------------------------------*/
typedef enum {START=0x01,STOP=0x02,WRD=0x04,RDA=0x08,ACK=0x10,NAK=0x20}i2c_status_t;
typedef enum {TEMP=0xF3,HUMID=0xF5,TEMPHOLD=0xE3,HUMIDHOLD=0xE5,WRUSER=0xE6,RDUSER=0xE7,RESET=0xFE}i2c_cmd_t;
/* Private define ------------------------------------------------------------*/
#define HTU20D_I2C_CLK_HZ 100000 /* Clock i2c speed 100KHz */
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
void I2C0Init(void)
{
I2C_InitStructure I2C_initStruct;
PORT_Init(PORTD, PIN2, FUNMUX_I2C0_SCL, 1); //GPIOD.2配置为I2C0 SCL引脚
PORT_Init(PORTD, PIN3, FUNMUX_I2C0_SDA, 1); //GPIOD.3配置为I2C0 SDA引脚
PORTD->OPEND |= (1 << PIN2)|(1 << PIN3); //开漏
PORTD->PULLU |= (1 << PIN2)|(1 << PIN3); //上拉
I2C_initStruct.Master = 1;
I2C_initStruct.Addr7b = 1;
I2C_initStruct.MstClk = HTU20D_I2C_CLK_HZ;
I2C_initStruct.MstIEn = 0;
I2C_Init(I2C0, &I2C_initStruct);
I2C_Open(I2C0);
//After power up, the device needs at most 15ms while SCK is high
osDelay(20);
}
void I2C_SEND_STATUS(I2C_TypeDef *i2c,i2c_status_t status)
{
uint8_t cmd=0;
if(status & START){cmd |= (1 << I2C_MSTCMD_STA_Pos);} //set start
if(status & STOP ){cmd |= (1 << I2C_MSTCMD_STO_Pos);} //set stop
if(status & WRD ){cmd |= (1 << I2C_MSTCMD_WR_Pos );} //set write
if(status & RDA ){cmd |= (1 << I2C_MSTCMD_RD_Pos );} //set read
if(status & ACK ){cmd &= ~(0 << I2C_MSTCMD_ACK_Pos);} //set ack
if(status & NAK ){cmd |= (1 << I2C_MSTCMD_ACK_Pos);} //set nack
i2c->MSTCMD=cmd;while(i2c->MSTCMD & I2C_MSTCMD_TIP_Msk){;} //等待发送完成
}
uint8_t I2C_SEND_DATA(I2C_TypeDef *i2c,uint8_t data,i2c_status_t status)
{
i2c->MSTDAT=data;
I2C_SEND_STATUS(i2c,status);
return (i2c->MSTCMD & I2C_MSTCMD_RXACK_Msk)?NAK:ACK;
}
uint8_t I2C_READ_DATA(I2C_TypeDef *i2c,i2c_status_t status)
{
I2C_SEND_STATUS(i2c,status);
return i2c->MSTDAT;
}
void HTU20D_Soft_Reset(void)
{
uint8_t ack;ack=ack;
//send i2c start + address + write
ack=I2C_SEND_DATA(I2C0,0x80,START|WRD);
//send Soft Reset Command
ack=I2C_SEND_DATA(I2C0,RESET,WRD|STOP);//0xFE
//The soft reset takes less than 15ms.
osDelay(20);
}
uint8_t HTU20D_Read_User_Register(void)
{
uint8_t ack;ack=ack;
//send i2c start + address + write
ack=I2C_SEND_DATA(I2C0,0x80,START|WRD);
//send Read Register Command
ack=I2C_SEND_DATA(I2C0,RDUSER,WRD);//0xE7
//send i2c start + address + read
ack=I2C_SEND_DATA(I2C0,0x81,START|WRD);
//read Register content
uint8_t data=I2C_READ_DATA(I2C0,RDA|NAK|STOP);
//wait i2c delay
osDelay(20);
return data;
}
void HTU20D_Write_User_Register(uint8_t data)
{
uint8_t ack;ack=ack;
//send i2c start + address + write
ack=I2C_SEND_DATA(I2C0,0x80,START|WRD);
//send Write Register Command
ack=I2C_SEND_DATA(I2C0,WRUSER,WRD);//0xE6
//send Register Content to be written
ack=I2C_SEND_DATA(I2C0,data,WRD|STOP);
//wait i2c delay
osDelay(20);
}
uint16_t HTU20D_Read_Temperature_Humidity(i2c_cmd_t cmd)
{
uint8_t ack;ack=ack;
//send i2c start + address + write
ack=I2C_SEND_DATA(I2C0,0x80,START|WRD);
//send Read Register Command
ack=I2C_SEND_DATA(I2C0,cmd,WRD);
//continue measuring
while(I2C_SEND_DATA(I2C0,0x81,START|WRD)==NAK){;}
//read Register content MSB
uint16_t data =I2C_READ_DATA(I2C0,RDA|ACK);
//read Register content LSB
data=(data<<8)+I2C_READ_DATA(I2C0,RDA|ACK);
//read Checksum
uint16_t cks = I2C_READ_DATA(I2C0,RDA|NAK|STOP);
//wait i2c delay
osDelay(20);
return data;
}
void HTU20D_Read(float *Temperature, float *Humidity)
{
float temp;
temp=HTU20D_Read_Temperature_Humidity(TEMP )&0xfffc;
// printf("HTU20D_Read Temperature=0x%x\n\r",(int)temp);
*Temperature=((temp*175.72)/65536)-46.85;
temp=HTU20D_Read_Temperature_Humidity(HUMID)&0xfffc;
// printf("HTU20D_Read Humidity =0x%x\n\r",(int)temp);
*Humidity=((temp*125)/65536)-6;
}
void HTU20D_test(void)
{
float Humidity,Temperature;
HTU20D_Soft_Reset();
HTU20D_Write_User_Register(0x00);
printf("HTU20D User_Registe=0x%02x\n\r",HTU20D_Read_User_Register());
HTU20D_Read(&Temperature,&Humidity);
printf("HTU20D Trigger No Hold T=%f 摄氏度 H=%f %%RH\n\r",Temperature,Humidity);
}//代码完毕
最近编辑记录 缥缈九哥 (2020-05-09 18:26:01)
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