SHT30温湿度传感器单片机模拟I2C代码实现

显示全部楼层 · 2020-9-2 17:12:59

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#include "EW_iic.h"

void EW_IIC_Start(void )
{
  SDA_H;
  __delay_cycles(8); //1us
  SCL_H;
  __delay_cycles(8); //1us
  SDA_L;
  __delay_cycles(80); //10us
  SCL_L;
  __delay_cycles(80); //10us
}

void EW_IIC_Stop(void )
{
  SDA_L;
  __delay_cycles(8); //1us
  SCL_L;
  __delay_cycles(8); //1us
  SCL_H;
  __delay_cycles(80); //10us
  SDA_H;
  __delay_cycles(80); //10us
}

void EW_IIC_WriteByte(INT8U txbyte)
{
  INT8U mask;

  for(mask = 0x80; mask > 0; mask >>= 1)
  {
if((mask & txbyte) == 0) SDA_L;
else SDA_H;
__delay_cycles(16); //2us
SCL_H;
__delay_cycles(16); //2us
SCL_L;
if(mask == 1)
{
   SDA_InitInputF();
}
  }
  __delay_cycles(16); //2us
  SCL_H;
  /*
  if(!SDA_READ)
  {
LED_TOG;
  }
  */
  __delay_cycles(16); //2us
  SCL_L;
  __delay_cycles(16); //2us
  SDA_H;
  SDA_InitOutHigh();
}

void EW_IIC_ReadByte(INT8U *rxbyte, AckDef ack)
{
  INT8U mask;
  *rxbyte = 0x00;

  SCL_L;
  SDA_InitInputF();

  for(mask = 0x80; mask > 0; mask >>= 1)
  {
__delay_cycles(16);
SCL_H;
if(SDA_READ) *rxbyte |= mask;
__delay_cycles(16);
SCL_L;
  }
  SDA_InitOutHigh();
  if(ack == ACK) SDA_L;
  else SDA_H;
  __delay_cycles(16);
  SCL_H;
  __delay_cycles(40);
  SCL_L;
  SDA_H;
  __delay_cycles(16);
}