Drive of DHTXX transmitter under STM32

DHT11 and DHT10 sensors, mainly collect temperature and humidity, based on my I2C simulation library implementation.

The main code is as follows:

#ifndef _sh10_drv_h_
#define _sh10_drv_h_

#include "stm32f10x_lib.h"

void Sh_i2cinit (void);

U8 Sh_writereg (U8 val);

U8 Sh_readreg (vu8 *val);

U8 sh_readtemprature (float *val);

U8 sh_readhumility (float *val);

U8 Sh_readtempandhum (float *t, float *h);

#endif//_sh10_drv_h_

#include "hky_sht10.h" #undef PIN_SCL #define PIN_SCL gpio_pin_6 #undef PIN_SDA #define PIN_SDA gpio_pin_7 #inclu De "hky_i2c.h" #define SH_CMD_TEMP 0x03 #define Sh_cmd_hum 0x05 #define SH_CMD_RD_REG 0x07 #define SH_CMD_WR_REG 0x0
    6 #define Sh_cmd_rst 0x1E void Sh_i2cinit () {U8 I;
    Twi_initialize ();
	for (i = 0; i < i++) {twi_scl_0 ();
	Twi_nop ();
	Twi_scl_1 ();
    Twi_nop ();
    } U8 Sh_writereg (U8 val) {U8 ret = Twi_ack;
    ret = Twi_start_sht ();

    if (ret = = Twi_bus_error) return ret;
    ret = Twi_sendbyte (Sh_cmd_wr_reg);
    
    if (ret = = Twi_nack) return ret;

    ret = Twi_sendbyte (val);
    Twi_stop ();
return ret;
    } U8 Sh_readreg (Vu8 *val) {U8 ret = Twi_ack;
    
    U8 sum = 0;
    ret = Twi_start_sht ();

    if (ret = = Twi_bus_error) return ret;
    Send address ret = Twi_sendbyte (Sh_cmd_rd_reg);
	
    if (ret = = Twi_nack) return ret;
    Read one byte *val = Twi_receivebyte (); Twi_sendnACK ();
    sum = Twi_receivebyte ();
    
    Twi_sendnack ();

    Twi_stop ();
return ret;
    } U8 Sh_readtempraturereg (u32 *val) {U8 ret = Twi_ack;
    U16 TMP;

    U8 Check_sum;
    ret = Twi_start_sht ();

    if (ret = = Twi_bus_error) return ret;
    Send address ret = Twi_sendbyte (sh_cmd_temp);
    if (ret = = Twi_nack) return ret;
    				       
    Delay_ms (100);
    TMP = Twi_receivebyte ();
    Twi_sendack ();
    TMP <<= 8;
    TMP |= twi_receivebyte ();
    
    Twi_sendack ();
    Check_sum = Twi_receivebyte ();

    Twi_stop ();

    *val = tmp;
return 0;
    } U8 Sh_readtemprature (float *val) {float D1, D2;
    U32 tmp;

    int ret; D1 = -39.66f;    3.5V D2 = 0.01;

    3.5V ret = Sh_readtempraturereg (&tmp);
    
    temprature = D1 + D2 * val *val = d1 + tmp * D2;
return ret;
    } U8 Sh_readhumilityreg (u32 *val) {U8 ret = Twi_ack;
    U16 TMP;

    U8 Check_sum;
    ret = Twi_start_sht (); if (ret = TWi_bus_error) return ret;
    Send address ret = Twi_sendbyte (Sh_cmd_hum);
   	 
	if (ret = = Twi_nack) return ret;

    Delay_ms (100);
    TMP = Twi_receivebyte ();
    Twi_sendack ();
    TMP <<= 8;
    TMP |= twi_receivebyte ();
    
    Twi_sendack ();
    Check_sum = Twi_receivebyte ();

    Twi_stop ();

    *val = tmp;
return 0;
    } U8 sh_readhumility (float *val) {float C1, C2, C3;
    U32 tmp;

    int ret;
    C1 =-4;
    C2 = 0.0405;
    
    C3 = -2.8 * 1E-6;
    ret = Sh_readhumilityreg (&tmp);
    
    *val = c1 + C2 * tmp + c3 * TMP * TMP;
return ret;
	} U8 Sh_readtempandhum (float *t, float *h) {float TT;
    U32 hh;
    int ret;
    float T1, T2;
    Float C1, C2, C3;

    float rh_linear;
    C1 = -4.0f;
    C2 = 0.0405f;

    C3 = -2.8 * 1e-6f;
    Humility adjust parameter T1 = 0.01f;

    t2 = 0.00008f;
    Read temprature ret = sh_readtemprature (&AMP;TT);
    if (Ret!= 0) return ret;

    *t = TT; Read Humility ret = Sh_readhumilityreg (&AMP;HH);

    if (Ret!= 0) return ret;

    Calculate Humility rh_linear = c1 + C2 * hh + c3 * hh * HH; Adjust humility if (tt-25.0f) > 10.0f | |
    (25.0F-TT) > 10.0f) {rh_linear = (tt-25.0f) * (t1 + t2 * hh) + rh_linear;

    } *h = Rh_linear;
return 0;
 }