SHT30参考程序

DelayMicroSeconds(1); // clock set-up time (t_SU;CLK)
error = I2c_WaitWhileClockStreching(timeout);// wait while clock streching
}
//-----------------------------------------------------------------------------
void I2c_StopCondition(void)
{
SCL_LOW();
DelayMicroSeconds(1);
static etError I2c_WaitWhileClockStreching(uint8_t timeout);
//-----------------------------------------------------------------------------
void DelayMicroSeconds(uint32_t nbrOfUs) /* -- adapt this delay for your uC -- */
DelayMicroSeconds(2);
for(mask = 0x80; mask > 0; mask >>= 1) // shift bit for masking (8 times)
{
SCL_HIGH(); // start clock on SCL-line
// I2C IO-Pins /* -- adapt the defines for your uC -- */
// SDA on port 0, bit 5
#define SDA_LOW() Pin_reset(4, 4) // set SDA to low
DelayMicroSeconds(1);
Pin_set_mode(4, 4, OUTPUT_PP_GP); //SDA
DelayMicroSeconds(20); // wait to see byte package on scope
return error; // return error code
#define ADD_HIGH() Pin_set(4, 3) //I2C address B:0x45.
#define nRESET_LOW() Pin_reset(4, 1)
#define nRESET_HIGH() Pin_set(4, 1)
//-- Static function prototypes -----------------------------------------------
}
//-----------------------------------------------------------------------------
void I2c_Init(void) /* -- adapt the init for your uC -- */
SDA_HIGH(); // release SDA-line
Pin_set_mode(4, 4, INPUT); //SDA
DelayMicroSeconds(1);
SCL_HIGH(); // clk #9 for ack
#define SCL_LOW() Pin_reset(4, 5)
#define SCL_HIGH() Pin_set(4, 5)
#define SCL_READ (Pin_read(4, 5)) // read SCL
#define ADD_LOW() Pin_reset(4, 3)//I2C address A:0x44(default).
//-----------------------------------------------------------------------------
etError I2c_WriteByte(uint8_t txByte)
{
etError error = NO_ERROR;
uint8_t mask;
}
//-----------------------------------------------------------------------------
etError I2c_ReadByte(uint8_t *rxByte, etI2cAck ack, uint8_t timeout)
{
uint32_t i;
for(i = 0; i < nbrOfUs*2; i++)
{
__NOP(); // nop's may be added or removed for timing adjustment
__NOP();
__NOP();
__NOP();
}
SCL_LOW();
SDA_HIGH(); // release SDA-line
DelayMicroSeconds(20); // wait to see byte package on scope
}
Pin_set_mode(4, 4, OUTPUT_PP_GP);//SDA
DelayMicroSeconds(2);
if(ack == ACK)
SDA_LOW(); // send acknowledge if necessary
else
for(mask = 0x80; mask > 0; mask >>= 1)// shift bit for masking (8 times)
{
if((mask & txByte) == 0)SDA_LOW(); // masking txByte, write bit to SDA-Line
DelayMicroSeconds(3); // SCL high time (t_HIGH)
if(SDA_READ)*rxByte |= mask; // read bit
SCL_LOW();
DelayMicroSeconds(1); // data hold time(t_HD;DAT)
DelayMicroSeconds(5); // SCL high time (t_HIGH)
SCL_LOW();
DelayMicroSeconds(1); // data hold time(t_HD;DAT)
}
}
void I2c_AddressSelect(uint8_t i2cAddress)
{
if(i2cAddress==0x44)ADD_LOW(); //add = 0x44
else if(i2cAddress==0x45)ADD_HIGH();
else ADD_LOW();
}
//-- Includes -----------------------------------------------------------------
#include "i2c_hal.h"
//-- Defines ------------------------------------------------------------------
{
Pin_set_mode(4, 1, OUTPUT_PP_GP);//nRESET
Pin_set_mode(4, 3, OUTPUT_PP_GP);//ADD
Pin_set_mode(4, 4, OUTPUT_PP_GP);//SDA
Pin_set_mode(4, 5, OUTPUT_PP_GP);//SCL
SCL_HIGH();
DelayMicroSeconds(1);
SDA_LOW();
DelayMicroSeconds(10); // hold time start condition (t_HD;STA)
SCL_LOW(); Fra bibliotekDelayMicroSeconds(10);
DelayMicroSeconds(1); // data set-up time (t_SU;DAT)
if(SDA_READ) error = ACK_ERROR; // check ack from i2c slave
SCL_LOW();
SDA_HIGH();
DelayMicroSeconds(1); // data set-up time (t_SU;DAT)
SCL_HIGH(); // clk #9 for ack
DelayMicroSeconds(5); // SCL high time (t_HIGH)
nRESET_HIGH();
}
//-----------------------------------------------------------------------------
void I2c_StartCondition(void)
{
SDA_HIGH();
DelayMicroSeconds(1);
return error; // return with no error
{
etError error = NO_ERROR;
uint8_t mask;
*rxByte = 0x00;
SDA_HIGH(); // release SDA-line
Pin_set_mode(4, 4, INPUT);//SDA