511 lines
11 KiB
C
511 lines
11 KiB
C
/*******************************************/
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/*@版权所有：广州奥松电子有限公司 */
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/*@作者：温湿度传感器事业部 */
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/*@版本：V1.2 */
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/*******************************************/
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#include "stm32f10x.h"
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#include "AHT20.h"
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void Delay_N10us(uint32_t t)//延时函数
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{
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uint32_t k;
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while(t--)
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{
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for (k = 0; k < 2; k++);//110
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}
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}
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void SensorDelay_us(uint32_t t)//延时函数
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{
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for(t = t-2; t>0; t--)
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{
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Delay_N10us(1);
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}
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}
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void Delay_4us(void) //延时函数
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{
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Delay_N10us(1);
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Delay_N10us(1);
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Delay_N10us(1);
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Delay_N10us(1);
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}
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void Delay_5us(void) //延时函数
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{
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Delay_N10us(1);
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Delay_N10us(1);
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Delay_N10us(1);
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Delay_N10us(1);
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Delay_N10us(1);
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}
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void Delay_1ms(uint32_t t) //延时函数
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{
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while(t--)
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{
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SensorDelay_us(1000);//////延时1ms
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}
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}
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void AHT20_Clock_Init(void) //延时函数
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{
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);
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}
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void SDA_Pin_Output_High(void) //将PB15配置为输出 ， 并设置为高电平， PB15作为I2C的SDA
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{
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GPIO_InitTypeDef GPIO_InitStruct;
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GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_OD;//开漏输出
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GPIO_InitStruct.GPIO_Pin = GPIO_Pin_1;
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GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_Init(GPIOB,& GPIO_InitStruct);
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GPIO_SetBits(GPIOB,GPIO_Pin_1);
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}
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void SDA_Pin_Output_Low(void) //将P15配置为输出 并设置为低电平
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{
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GPIO_InitTypeDef GPIO_InitStruct;
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GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_OD;//开漏输出
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GPIO_InitStruct.GPIO_Pin = GPIO_Pin_1;
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GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_Init(GPIOB,& GPIO_InitStruct);
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GPIO_ResetBits(GPIOB,GPIO_Pin_1);
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}
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void SDA_Pin_IN_FLOATING(void) //SDA配置为浮空输入
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{
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GPIO_InitTypeDef GPIO_InitStruct;
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GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN_FLOATING;//
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GPIO_InitStruct.GPIO_Pin = GPIO_Pin_1;
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GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_Init( GPIOB,&GPIO_InitStruct);
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}
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void SCL_Pin_Output_High(void) //SCL输出高电平，P14作为I2C的SCL
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{
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GPIO_SetBits(GPIOB,GPIO_Pin_0);
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}
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void SCL_Pin_Output_Low(void) //SCL输出低电平
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{
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GPIO_ResetBits(GPIOB,GPIO_Pin_0);
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}
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void Init_I2C_Sensor_Port(void) //初始化I2C接口,输出为高电平
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{
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GPIO_InitTypeDef GPIO_InitStruct;
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AHT20_Clock_Init();
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GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_OD;//开漏输出
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GPIO_InitStruct.GPIO_Pin = GPIO_Pin_1;
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GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_Init(GPIOB,&GPIO_InitStruct);
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GPIO_SetBits(GPIOB,GPIO_Pin_1);//输出高电平
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GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_OD;//开漏输出
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GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0;
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GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_Init(GPIOB,&GPIO_InitStruct);
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GPIO_SetBits(GPIOB,GPIO_Pin_0);//输出高电平
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}
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void I2C_Start(void) //I2C主机发送START信号
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{
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SDA_Pin_Output_High();
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SensorDelay_us(8);
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SCL_Pin_Output_High();
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SensorDelay_us(8);
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SDA_Pin_Output_Low();
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SensorDelay_us(8);
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SCL_Pin_Output_Low();
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SensorDelay_us(8);
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}
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void AHT20_WR_Byte(uint8_t Byte) //往AHT20写一个字节
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{
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uint8_t Data,N,i;
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Data=Byte;
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i = 0x80;
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for(N=0;N<8;N++)
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{
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SCL_Pin_Output_Low();
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Delay_4us();
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if(i&Data)
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{
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SDA_Pin_Output_High();
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}
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else
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{
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SDA_Pin_Output_Low();
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}
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SCL_Pin_Output_High();
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Delay_4us();
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Data <<= 1;
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}
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SCL_Pin_Output_Low();
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SensorDelay_us(8);
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SDA_Pin_IN_FLOATING();
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SensorDelay_us(8);
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}
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uint8_t AHT20_RD_Byte(void)//从AHT20读取一个字节
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{
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uint8_t Byte,i,a;
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Byte = 0;
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SCL_Pin_Output_Low();
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SDA_Pin_IN_FLOATING();
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SensorDelay_us(8);
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for(i=0;i<8;i++)
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{
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SCL_Pin_Output_High();
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Delay_5us();
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a=0;
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if(GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_1)) a=1;
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Byte = (Byte<<1)|a;
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SCL_Pin_Output_Low();
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Delay_5us();
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}
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SDA_Pin_IN_FLOATING();
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SensorDelay_us(8);
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return Byte;
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}
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uint8_t Receive_ACK(void) //看AHT20是否有回复ACK
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{
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uint16_t CNT;
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CNT = 0;
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SCL_Pin_Output_Low();
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SDA_Pin_IN_FLOATING();
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SensorDelay_us(8);
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SCL_Pin_Output_High();
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SensorDelay_us(8);
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while((GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_1)) && CNT < 100)
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CNT++;
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if(CNT == 100)
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{
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return 0;
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}
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SCL_Pin_Output_Low();
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SensorDelay_us(8);
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return 1;
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}
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void Send_ACK(void) //主机回复ACK信号
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{
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SCL_Pin_Output_Low();
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SensorDelay_us(8);
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SDA_Pin_Output_Low();
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SensorDelay_us(8);
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SCL_Pin_Output_High();
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SensorDelay_us(8);
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SCL_Pin_Output_Low();
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SensorDelay_us(8);
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SDA_Pin_IN_FLOATING();
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SensorDelay_us(8);
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}
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void Send_NOT_ACK(void) //主机不回复ACK
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{
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SCL_Pin_Output_Low();
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SensorDelay_us(8);
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SDA_Pin_Output_High();
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SensorDelay_us(8);
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SCL_Pin_Output_High();
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SensorDelay_us(8);
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SCL_Pin_Output_Low();
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SensorDelay_us(8);
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SDA_Pin_Output_Low();
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SensorDelay_us(8);
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}
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void Stop_I2C(void) //一条协议结束
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{
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SDA_Pin_Output_Low();
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SensorDelay_us(8);
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SCL_Pin_Output_High();
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SensorDelay_us(8);
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SDA_Pin_Output_High();
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SensorDelay_us(8);
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}
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uint8_t AHT20_Read_Status(void)//读取AHT20的状态寄存器
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{
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uint8_t Byte_first;
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I2C_Start();
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AHT20_WR_Byte(0x71);
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Receive_ACK();
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Byte_first = AHT20_RD_Byte();
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Send_NOT_ACK();
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Stop_I2C();
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return Byte_first;
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}
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void AHT20_SendAC(void) //向AHT20发送AC命令
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{
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I2C_Start();
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AHT20_WR_Byte(0x70);
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Receive_ACK();
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AHT20_WR_Byte(0xac);//0xAC采集命令
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Receive_ACK();
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AHT20_WR_Byte(0x33);
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Receive_ACK();
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AHT20_WR_Byte(0x00);
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Receive_ACK();
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Stop_I2C();
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}
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//CRC校验类型：CRC8/MAXIM
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//多项式：X8+X5+X4+1
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//Poly：0011 0001 0x31
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//高位放到后面就变成 1000 1100 0x8c
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//C现实代码：
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uint8_t Calc_CRC8(uint8_t *message,uint8_t Num)
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{
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uint8_t i;
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uint8_t byte;
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uint8_t crc=0xFF;
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for(byte=0; byte<Num; byte++)
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{
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crc^=(message[byte]);
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for(i=8;i>0;--i)
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{
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if(crc&0x80) crc=(crc<<1)^0x31;
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else crc=(crc<<1);
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}
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}
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return crc;
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}
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void AHT20_Read_CTdata(uint32_t *ct) //没有CRC校验，直接读取AHT20的温度和湿度数据
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{
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volatile uint8_t Byte_1th=0;
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volatile uint8_t Byte_2th=0;
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volatile uint8_t Byte_3th=0;
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volatile uint8_t Byte_4th=0;
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volatile uint8_t Byte_5th=0;
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volatile uint8_t Byte_6th=0;
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uint32_t RetuData = 0;
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uint16_t cnt = 0;
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AHT20_SendAC();//向AHT20发送AC命令
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Delay_1ms(80);//延时80ms左右
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cnt = 0;
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while(((AHT20_Read_Status()&0x80)==0x80))//直到状态bit[7]为0，表示为空闲状态，若为1，表示忙状态
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{
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SensorDelay_us(1508);
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if(cnt++>=100)
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{
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break;
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}
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}
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I2C_Start();
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AHT20_WR_Byte(0x71);
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Receive_ACK();
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Byte_1th = AHT20_RD_Byte();//状态字，查询到状态为0x98,表示为忙状态，bit[7]为1；状态为0x1C，或者0x0C，或者0x08表示为空闲状态，bit[7]为0
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Send_ACK();
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Byte_2th = AHT20_RD_Byte();//湿度
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Send_ACK();
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Byte_3th = AHT20_RD_Byte();//湿度
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Send_ACK();
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Byte_4th = AHT20_RD_Byte();//湿度/温度
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Send_ACK();
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Byte_5th = AHT20_RD_Byte();//温度
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Send_ACK();
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Byte_6th = AHT20_RD_Byte();//温度
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Send_NOT_ACK();
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Stop_I2C();
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RetuData = (RetuData|Byte_2th)<<8;
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RetuData = (RetuData|Byte_3th)<<8;
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RetuData = (RetuData|Byte_4th);
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RetuData =RetuData >>4;
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ct[0] = RetuData;//湿度
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RetuData = 0;
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RetuData = (RetuData|Byte_4th)<<8;
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RetuData = (RetuData|Byte_5th)<<8;
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RetuData = (RetuData|Byte_6th);
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RetuData = RetuData&0xfffff;
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ct[1] =RetuData; //温度
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}
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void AHT20_Read_CTdata_crc(uint32_t *ct) //CRC校验后，读取AHT20的温度和湿度数据
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{
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volatile uint8_t Byte_1th=0;
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volatile uint8_t Byte_2th=0;
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volatile uint8_t Byte_3th=0;
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volatile uint8_t Byte_4th=0;
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volatile uint8_t Byte_5th=0;
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volatile uint8_t Byte_6th=0;
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volatile uint8_t Byte_7th=0;
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uint32_t RetuData = 0;
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uint16_t cnt = 0;
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// uint8_t CRCDATA=0;
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uint8_t CTDATA[6]={0};//用于CRC传递数组
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AHT20_SendAC();//向AHT20发送AC命令
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Delay_1ms(80);//延时80ms左右
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cnt = 0;
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while(((AHT20_Read_Status()&0x80)==0x80))//直到状态bit[7]为0，表示为空闲状态，若为1，表示忙状态
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{
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SensorDelay_us(1508);
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if(cnt++>=100)
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{
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break;
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}
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}
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I2C_Start();
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AHT20_WR_Byte(0x71);
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Receive_ACK();
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CTDATA[0]=Byte_1th = AHT20_RD_Byte();//状态字，查询到状态为0x98,表示为忙状态，bit[7]为1；状态为0x1C，或者0x0C，或者0x08表示为空闲状态，bit[7]为0
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Send_ACK();
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CTDATA[1]=Byte_2th = AHT20_RD_Byte();//湿度
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Send_ACK();
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CTDATA[2]=Byte_3th = AHT20_RD_Byte();//湿度
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Send_ACK();
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CTDATA[3]=Byte_4th = AHT20_RD_Byte();//湿度/温度
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Send_ACK();
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CTDATA[4]=Byte_5th = AHT20_RD_Byte();//温度
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Send_ACK();
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CTDATA[5]=Byte_6th = AHT20_RD_Byte();//温度
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Send_ACK();
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Byte_7th = AHT20_RD_Byte();//CRC数据
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Send_NOT_ACK(); //注意: 最后是发送NAK
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Stop_I2C();
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if(Calc_CRC8(CTDATA,6)==Byte_7th)
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{
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RetuData = (RetuData|Byte_2th)<<8;
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RetuData = (RetuData|Byte_3th)<<8;
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RetuData = (RetuData|Byte_4th);
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RetuData =RetuData >>4;
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ct[0] = RetuData;//湿度
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RetuData = 0;
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RetuData = (RetuData|Byte_4th)<<8;
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RetuData = (RetuData|Byte_5th)<<8;
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RetuData = (RetuData|Byte_6th);
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RetuData = RetuData&0xfffff;
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ct[1] =RetuData; //温度
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}
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else
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{
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ct[0]=0x00;
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ct[1]=0x00;//校验错误返回值，客户可以根据自己需要更改
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}//CRC数据
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}
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void JH_Reset_REG(uint8_t addr)
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{
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uint8_t Byte_first,Byte_second,Byte_third,Byte_fourth;
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I2C_Start();
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AHT20_WR_Byte(0x70);//原来是0x70
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Receive_ACK();
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AHT20_WR_Byte(addr);
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Receive_ACK();
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AHT20_WR_Byte(0x00);
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Receive_ACK();
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AHT20_WR_Byte(0x00);
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Receive_ACK();
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Stop_I2C();
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Delay_1ms(5);//延时5ms左右
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I2C_Start();
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AHT20_WR_Byte(0x71);//
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Receive_ACK();
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Byte_first = AHT20_RD_Byte();
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Send_ACK();
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Byte_second = AHT20_RD_Byte();
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Send_ACK();
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Byte_third = AHT20_RD_Byte();
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Send_NOT_ACK();
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Stop_I2C();
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Delay_1ms(10);//延时10ms左右
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I2C_Start();
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AHT20_WR_Byte(0x70);///
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Receive_ACK();
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AHT20_WR_Byte(0xB0|addr);////寄存器命令
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Receive_ACK();
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AHT20_WR_Byte(Byte_second);
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Receive_ACK();
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AHT20_WR_Byte(Byte_third);
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Receive_ACK();
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Stop_I2C();
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Byte_second=0x00;
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Byte_third =0x00;
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}
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void AHT20_Start_Init(void)
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{
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JH_Reset_REG(0x1b);
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JH_Reset_REG(0x1c);
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JH_Reset_REG(0x1e);
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}
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//int32_t main(void)
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//{
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// uint32_t CT_data[2];
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// volatile int c1,t1;
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// /***********************************************************************************/
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// /**///上电初始化SDA，SCL的IO口
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// /***********************************************************************************/
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// Init_I2C_Sensor_Port();
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// /***********************************************************************************/
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// /**///①刚上电，产品芯片内部就绪需要时间，延时100~500ms,建议500ms
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// /***********************************************************************************/
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// Delay_1ms(500);
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// /***********************************************************************************/
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// /**///②上电第一次发0x71读取状态字，判断状态字是否为0x18,如果不是0x18,进行寄存器初始化
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// /***********************************************************************************/
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// if((AHT20_Read_Status()&0x18)!=0x18)
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// {
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// AHT20_Start_Init(); //重新初始化寄存器
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// Delay_1ms(10);
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// }
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//
|
||
// /***********************************************************************************/
|
||
// /**///③根据客户自己需求发测量命令读取温湿度数据，当前while（1）循环发测量命令读取温湿度数据，仅供参考
|
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// /***********************************************************************************/
|
||
// while(1)
|
||
// {
|
||
// AHT20_Read_CTdata(CT_data); //不经过CRC校验，直接读取AHT20的温度和湿度数据 推荐每隔大于1S读一次
|
||
// //AHT20_Read_CTdata_crc(CT_data); //crc校验后，读取AHT20的温度和湿度数据
|
||
//
|
||
|
||
// c1 = CT_data[0]*100*10/1024/1024; //计算得到湿度值c1（放大了10倍）
|
||
// t1 = CT_data[1]*200*10/1024/1024-500;//计算得到温度值t1（放大了10倍）
|
||
// ////下一步客户处理显示数据，
|
||
// /***********************************************************************************/
|
||
// /**///延时1.5s，建议间隔1.5s读一次
|
||
// /***********************************************************************************/
|
||
// delay_ms(1500);
|
||
// }
|
||
|
||
// }
|