STC8K_SHT20_BMP280_DEMO.rar_7KC_STC_STC8A8K_bmp280例程_i2c

#include <INTRINS.H> //Keil library #define uchar unsigned char #define uint unsigned int #include "MAIN\STC15Fxxxx.H" #include "bmp280.h" #include "UART1.H" #include "DELAY.H" long BMP280_QY; bit BMP280_LINK; #define BMP280_I2C_ADDR (0x76) //sdo=0 地址=0X76 #define BMP280_DEFAULT_CHIP_ID (0x58) #define BMP280_CHIP_ID_REG (0xD0) /* Chip ID Register */ #define BMP280_RST_REG (0xE0) /* Softreset Register */ #define BMP280_STAT_REG (0xF3) /* Status Register */ #define BMP280_CTRL_MEAS_REG (0xF4) /* Ctrl Measure Register */ #define BMP280_CONFIG_REG (0xF5) /* Configuration Register */ //--------------------------------------------------------- #define BMP280_PRESSURE_MSB_REG (0xF7) /* Pressure MSB Register */ #define BMP280_PRESSURE_LSB_REG (0xF8) /* Pressure LSB Register */ #define BMP280_PRESSURE_XLSB_REG (0xF9) /* Pressure XLSB Register */ #define BMP280_TEMPERATURE_MSB_REG (0xFA) /* Temperature MSB Reg */ #define BMP280_TEMPERATURE_LSB_REG (0xFB) /* Temperature LSB Reg */ #define BMP280_TEMPERATURE_XLSB_REG (0xFC) /* Temperature XLSB Reg */ #define BMP280_FORCED_MODE (0x01) #define BMP280_TEMPERATURE_CALIB_DIG_T1_LSB_REG (0x88) //#define BMP280_PRESSURE_TEMPERATURE_CALIB_DATA_LENGTH (24) //#define BMP280_DATA_FRAME_SIZE (6) #define BMP280_OVERSAMP_SKIPPED (0x00) #define BMP280_OVERSAMP_1X (0x01) #define BMP280_OVERSAMP_2X (0x02) #define BMP280_OVERSAMP_4X (0x03) #define BMP280_OVERSAMP_8X (0x04) #define BMP280_OVERSAMP_16X (0x05) // configure pressure and temperature oversampling, forced sampling mode #define BMP280_PRESSURE_OSR (BMP280_OVERSAMP_8X) #define BMP280_TEMPERATURE_OSR (BMP280_OVERSAMP_1X) #define BMP280_MODE (BMP280_PRESSURE_OSR << 2 | BMP280_TEMPERATURE_OSR << 5 | BMP280_FORCED_MODE) #define T_INIT_MAX (20) // 20/16 = 1.25 ms #define T_MEASURE_PER_OSRS_MAX (37) // 37/16 = 2.3125 ms #define T_SETUP_PRESSURE_MAX (10) // 10/16 = 0.625 ms unsigned short dig_T1,dig_P1; short dig_T2,dig_T3 ,dig_P2,dig_P3,dig_P4,dig_P5,dig_P6,dig_P7,dig_P8,dig_P9; long t_fine; //bit BMP280_LINK; uchar bmp280_chip_id = 0; long bmp280_up = 0; long bmp280_ut = 0; uchar bmp280_data[24]; void bmp280_start_up(); void bmp280_get_up(); sbit BMP280_SCL=P2^5; //IIC时钟引脚定义 sbit BMP280_SDA=P2^4; //IIC数据引脚定义 ////延时5ms //void Delay5ms() //{ // CCON = 0; //清除CF、CR、CCF0、CCF1 // CH = (65536-9216)/256; //PCA基准定时器设初值。 // CL = (65536-9216)%256; //65536-22.1184M振荡MHZ/12*5000US =65536-4608*2 // CR = 1; //启动PCA定时器。 // while (!CF); //} void BMP280_Delay5us() //@@22.1184MHz { unsigned char i; _nop_(); i = 25; while (--i); } /************************************** 起始信号 **************************************/ void BMP280_Start() { BMP280_SDA = 1; //拉高数据线 BMP280_Delay5us(); //延时 BMP280_SCL = 1; //拉高时钟线 BMP280_Delay5us(); //延时 BMP280_SDA = 0; //产生下降沿 BMP280_Delay5us(); //延时 BMP280_SCL = 0; //拉低时钟线 BMP280_Delay5us(); //延时 } /************************************** 停止信号 **************************************/ void BMP280_Stop() { BMP280_SDA = 0; //拉低数据线 BMP280_Delay5us(); //延时 BMP280_SCL = 1; //拉高时钟线 BMP280_Delay5us(); //延时 BMP280_SDA = 1; //产生上升沿 BMP280_Delay5us(); //延时 } /************************************** 发送应答信号 入口参数:ack (0:ACK 1:NAK) **************************************/ void BMP280_SendACK(bit ack) { BMP280_SDA = ack; //写应答信号 BMP280_Delay5us(); //延时 BMP280_SCL = 1; //拉高时钟线 BMP280_Delay5us(); //延时 BMP280_SCL = 0; //拉低时钟线 BMP280_Delay5us(); //延时 } /************************************** 接收应答信号 **************************************/ uchar BMP280_RecvACK() { BMP280_Delay5us(); BMP280_SCL = 1; //拉高时钟线 BMP280_SDA=1; BMP280_Delay5us(); //延时 CY = BMP280_SDA; //读应答信号 BMP280_SCL = 0; //拉低时钟线 BMP280_Delay5us(); //延时 return CY; // if (CY==0) {return 1;} else{return 0;} //没有应答，则BMP280没安装 } /************************************** 向IIC总线发送一个字节数据 **************************************/ uchar BMP280_SendByte(uchar dat) { uchar i; for (i=0; i<8; i++) //8位计数器 { dat <<= 1; //移出数据的最高位 BMP280_SDA = CY; //送数据口 BMP280_Delay5us(); //延时 BMP280_SCL = 1; //拉高时钟线 BMP280_Delay5us(); //延时 BMP280_SCL = 0; //拉低时钟线 BMP280_Delay5us(); //延时 } return BMP280_RecvACK(); // 0 =有应答 1=没有应答 } /************************************** 从IIC总线接收一个字节数据 **************************************/ uchar BMP280_RecvByte() { uchar i; uchar dat = 0; BMP280_SDA = 1; //使能内部上拉,准备读取数据, for (i=0; i<8; i++) //8位计数器 { dat <<= 1; BMP280_SCL = 1; //拉高时钟线 BMP280_Delay5us(); //延时 dat |= BMP280_SDA; //读数据 BMP280_SCL = 0; //拉低时钟线 BMP280_Delay5us(); //延时 } return dat; } uchar i2cRead(uchar add,uchar reg,uchar len,uchar *ndata) { uchar i; BMP280_Start(); //起始信号 if (BMP280_SendByte(add<<1)==1){return 3;} //发送设备地址+写信号 // if (BMP280_SendByte(0xec)==1){return 3;} //发送设备地址+写信号 //---------------------------------------------- if (BMP280_SendByte(reg)==1){return 1;} //要读的寄存器起始地址 //---------------------------------------------- BMP280_Start(); //起始信号 if (BMP280_SendByte((add<<1)+1)==1){return 2;} //发送设备地址+读信号 // if (BMP280_SendByte(0xed)==1){return 2;} //发送设备地址+读信号 //---------------------------------------------- if (len==1) { *ndata = BMP280_RecvByte(); ndata++; //BUF[0]存储 BMP280_SendACK(1); //最后一个数据需要回NOACKM } else { for (i=0; i<(len-1); i++) { *ndata = BMP280_RecvByte(); ndata++; //BUF[0]存储 BMP280_SendACK(0); //不是最后一个数据，则回应ACKM } *ndata = BMP280_RecvByte(); ndata++; //BUF[0]存储 BMP280_SendACK(1); //最后一个数据需要回NOACKM } BMP280_Stop(); //发送停止信号 return 5; return 5; } uchar i2cWrite(uchar add,uchar reg,uchar ndata) { BMP280_Start(); //起始信号 if (BMP280_SendByte(add<<1)==1){return 0;} //发送设备地址+写信号 //---------------------------------------------- if (BMP280_SendByte(reg)==1){return 0;} //要读的寄存器起始地址 if (BMP280_SendByte(ndata)==1){return 0;} //要读的寄存器起始地址 BMP280_Stop(); //发送停止信号 return 1; } // Returns temperature in DegC, resolution is 0.01 DegC. Output value of "5123" equals 51.23 DegC // t_fine carries fine temperature as global va