148 lines
3.2 KiB
C
148 lines
3.2 KiB
C
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/*
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* AHT20.c
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*
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* Created on: Sep 24, 2024
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* Author: 10425
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*/
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#include "AHT20.h"
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#define I2C_HANDLE hi2c2
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#define AHT20_TIMEOUT 10
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MYI2C_Struct SENx = {0};
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void AHT20_Init(MYI2C_Struct *pst,uint16_t ReadTimMS,uint16_t xAddr)
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{
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HAL_StatusTypeDef result;
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pst->Adrr =xAddr;
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pst->Step = SENSOR_IDLE;
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result=HAL_I2C_IsDeviceReady(&I2C_HANDLE, pst->Adrr<<1, 10, 200);
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if(ReadTimMS>MinReadTim)pst->SetRTim=ReadTimMS;
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else pst->SetRTim=MinReadTim;
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}
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uint8_t AHT20_READ_FUNC(MYI2C_Struct *pst,uint8_t device_addr,uint8_t register_addr,uint8_t *pDat,uint8_t len)
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{
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uint8_t NoAck=0;
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if(register_addr)
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{
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// 发送寄存器地址
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if (HAL_I2C_Mem_Write(&I2C_HANDLE, (device_addr << 1), register_addr, I2C_MEMADD_SIZE_8BIT, NULL, 0, AHT20_TIMEOUT) != HAL_OK)
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{
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NoAck++;
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}
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}
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// 读取数据
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if (HAL_I2C_Master_Receive(&I2C_HANDLE, (device_addr << 1) | 0x01, pDat, len, AHT20_TIMEOUT) != HAL_OK)
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{
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NoAck++;
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}
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pst->ErrFlag=NoAck;
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return NoAck;
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}
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/*******************************************************************************
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* Function Name :
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* Description :
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* Input : None
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* Output : None
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* Return :None
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*******************************************************************************/
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uint8_t AHT20_WRITE_FUNC(MYI2C_Struct *pst,uint8_t device_addr,uint8_t register_addr,uint8_t *pDat,uint8_t len)
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{
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uint8_t NoAck = 0;
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// 将要发送的数据缓冲区
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uint8_t data_buffer[len + 1];
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data_buffer[0] = register_addr; // 第一个字节是寄存器地址
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memcpy(&data_buffer[1], pDat, len); // 后续字节是要写入的数据
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// 发送设备地址、寄存器地址和数据
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if (HAL_I2C_Master_Transmit(&I2C_HANDLE, (device_addr << 1), data_buffer, len + 1, HAL_MAX_DELAY) != HAL_OK)
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{
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NoAck++;
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}
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// 更新错误标志
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pst->ErrFlag = NoAck;
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return NoAck;
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}
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uint8_t CheckCrc8(uint8_t *pDat,uint8_t Lenth)
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{
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uint8_t crc = 0xff, i, j;
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for (i = 0; i < Lenth ; i++)
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{
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crc = crc ^ *pDat;
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for (j = 0; j < 8; j++)
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{
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if (crc & 0x80) crc = (crc << 1) ^ 0x31;
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else crc <<= 1;
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}
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pDat++;
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}
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return crc;
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}
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void AHT20_Handle(MYI2C_Struct *pst)
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{
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uint32_t s32x;
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pst->timcnt += MYI2C_Tick;
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if(pst->timcnt>PowerOnTim && pst->Step==SENSOR_IDLE)
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{
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pst->Step=SENSOR_MEASURE;
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pst->SendByte[0]=0x33;
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pst->SendByte[1]=0x00;
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AHT20_WRITE_FUNC(pst,pst->Adrr,0xAC, &pst->SendByte[0], 2);
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}
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else if(pst->timcnt>MeasureTim && pst->Step==SENSOR_MEASURE)
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{
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pst->Step=SENSOR_COMPLETE;
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AHT20_READ_FUNC(pst,pst->Adrr,0, &pst->ReadByte[0], 7);
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if(pst->ErrFlag==0)
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{
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if((CheckCrc8(&pst->ReadByte[0],6)==pst->ReadByte[6])&&((pst->ReadByte[0]&0x98) == 0x18))
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{
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s32x=pst->ReadByte[1];s32x=s32x<<8;s32x+=pst->ReadByte[2];s32x=s32x<<8;s32x+=pst->ReadByte[3];s32x=s32x>>4;
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pst->RH=s32x;
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pst->RH=pst->RH*100/1048576;
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s32x=pst->ReadByte[3]&0x0F;s32x=s32x<<8;s32x+=pst->ReadByte[4];s32x=s32x<<8;s32x+=pst->ReadByte[5];
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pst->T=s32x;
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pst->T=pst->T*200/1048576-50;
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}
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}
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else
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{
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pst->RH=0;
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pst->T=0;
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}
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}
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else if(pst->timcnt>pst->SetRTim)
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{
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pst->Step=SENSOR_IDLE;
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pst->timcnt=0;
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}
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}
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