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#include "bmp085.h"
#include "lcd12864.h"
#define BMP085_SlaveAddress 0xee // 定義器件在IIC總線中的從地址
#define OSS 0 // Oversampling Setting (note: code is not set up to use other OSS values)
sbit SCL = P3^5; // I2C時(shí)鐘引腳定義
sbit SDA = P3^6; // I2C數(shù)據(jù)引腳定義
short ac1, ac2, ac3;
unsigned short ac4, ac5, ac6;
short b1, b2;
short mb, mc, md;
// 11.0592MHz 1T ----------------------------------
void Delay5us(void)
{
unsigned char a;
for(a=26; a>0; a--);
}
// 11.0592MHz 1T ----------------------------------
void Delay5ms(void)
{
unsigned char a,b,c;
for(c=7; c>0; c--)
for(b=168; b>0; b--)
for(a=22; a>0; a--);
}
// 起始信號(hào) --------------------------------------
void I2C_Start()
{
SDA = 1; // 拉高數(shù)據(jù)線
SCL = 1; // 拉高時(shí)鐘線
Delay5us(); // 延時(shí)
SDA = 0; // 產(chǎn)生下降沿
Delay5us(); // 延時(shí)
SCL = 0; // 拉低時(shí)鐘線
}
// 停止信號(hào) --------------------------------------
void I2C_Stop()
{
SDA = 0; // 拉低數(shù)據(jù)線
SCL = 1; // 拉高時(shí)鐘線
Delay5us(); // 延時(shí)
SDA = 1; // 產(chǎn)生上升沿
Delay5us(); // 延時(shí)
}
// 發(fā)送應(yīng)答信號(hào) ----------------------------------
// 輸入：0-ACK 1-NACK -----------------------------
void I2C_SendACK(bit ack)
{
SDA = ack; // 寫應(yīng)答信號(hào)
SCL = 1; // 拉高時(shí)鐘線
Delay5us(); // 延時(shí)
SCL = 0; // 拉低時(shí)鐘線
Delay5us(); // 延時(shí)
}
// 接收應(yīng)答信號(hào) -----------------------------------
bit I2C_RecvACK()
{
SCL = 1; // 拉高時(shí)鐘線
Delay5us(); // 延時(shí)
CY = SDA; // 讀應(yīng)答信號(hào)
SCL = 0; // 拉低時(shí)鐘線
Delay5us(); // 延時(shí)
return CY;
}
/**
* 向I2C總線發(fā)送一個(gè)字節(jié)數(shù)據(jù)
*/
void I2C_SendByte(unsigned char dat)
{
unsigned char i;
for (i=0; i<8; i++) { // 8位計(jì)數(shù)器
dat <<= 1; // 移出數(shù)據(jù)的最高位
SDA = CY; // 送數(shù)據(jù)口
SCL = 1; // 拉高時(shí)鐘線
Delay5us(); // 延時(shí)
SCL = 0; // 拉低時(shí)鐘線
Delay5us(); // 延時(shí)
}
I2C_RecvACK();
}
/**
* 從I2C總線接收一個(gè)字節(jié)數(shù)據(jù)
*/
unsigned char I2C_RecvByte()
{
unsigned char i;
unsigned char dat = 0;
SDA = 1; // 使能內(nèi)部上拉,準(zhǔn)備讀取數(shù)據(jù),
for (i=0; i<8; i++) { // 8位計(jì)數(shù)器
dat <<= 1; // 移出數(shù)據(jù)的最高位
SCL = 1; // 拉高時(shí)鐘線
Delay5us(); // 延時(shí)
dat |= SDA; // 讀數(shù)據(jù)
SCL = 0; // 拉低時(shí)鐘線
Delay5us(); // 延時(shí)
}
return dat;
}
/*
* 讀出BMP085內(nèi)部數(shù)據(jù),連續(xù)兩個(gè)
* 輸入：adr-寄存器地址
*/
short BMP085_MultipleRead(unsigned char adr)
{
unsigned char msb, lsb;
short dat;
I2C_Start(); // 起始信號(hào)
I2C_SendByte(BMP085_SlaveAddress); // 發(fā)送設(shè)備地址 + 寫信號(hào)
I2C_SendByte(adr); // 發(fā)送存儲(chǔ)單元地址
I2C_Start(); // 起始信號(hào)
I2C_SendByte(BMP085_SlaveAddress+1); // 發(fā)送設(shè)備地址+讀信號(hào)
msb = I2C_RecvByte(); // 讀取數(shù)據(jù)
I2C_SendACK(0); // ACK
lsb = I2C_RecvByte();
I2C_SendACK(1); // 最后一個(gè)數(shù)據(jù)不應(yīng)答
I2C_Stop(); // 停止信號(hào)
Delay5ms();
dat = msb << 8;
dat |= lsb;
return dat;
}
/*
* 讀取溫度數(shù)據(jù)
*/
long BMP085_ReadTemp(void)
{
I2C_Start(); // 起始信號(hào)
I2C_SendByte(BMP085_SlaveAddress); // 發(fā)送設(shè)備地址+寫信號(hào)
I2C_SendByte(0xF4); // 0xF4--進(jìn)行測(cè)量
I2C_SendByte(0x2E); // write register data for temp
I2C_Stop(); // 發(fā)送停止信號(hào)
Delay5ms(); // max conversion time is 4.5ms
return (long)BMP085_MultipleRead(0xF6); // 讀取返回值
}
/**
* 讀取壓強(qiáng)數(shù)據(jù)
*/
long BMP085_ReadPressure(void)
{
long pressure = 0;
I2C_Start(); // 起始信號(hào)
I2C_SendByte(BMP085_SlaveAddress); // 發(fā)送設(shè)備地址+寫信號(hào)
I2C_SendByte(0xF4); // 0xF4--進(jìn)行測(cè)量
I2C_SendByte(0x34); // write register data for pressure
I2C_Stop(); // 發(fā)送停止信號(hào)
Delay5ms(); // max conversion time is 4.5ms
pressure = BMP085_MultipleRead(0xF6); // 讀取返回值
pressure &= 0x0000FFFF;
return pressure;
}
/**
* 每個(gè)器件都有自己?jiǎn)为?dú)的校準(zhǔn)系數(shù)，讀取校準(zhǔn)數(shù)據(jù)。
*/
void BMP085_Init(void)
{
ac1 = BMP085_MultipleRead(0xAA);
ac2 = BMP085_MultipleRead(0xAC);
ac3 = BMP085_MultipleRead(0xAE);
ac4 = BMP085_MultipleRead(0xB0);
ac5 = BMP085_MultipleRead(0xB2);
ac6 = BMP085_MultipleRead(0xB4);
b1 = BMP085_MultipleRead(0xB6);
b2 = BMP085_MultipleRead(0xB8);
mb = BMP085_MultipleRead(0xBA);
mc = BMP085_MultipleRead(0xBC);
md = BMP085_MultipleRead(0xBE);
}
/**
* 數(shù)據(jù)讀取顯示
*/
long ut, up;
long x1, x2, b5, b6, x3, b3, p;
unsigned long b4, b7;
long temperature, pressure;
void BMP085_Convert(void)
{
unsigned char i, dis_temp[9] = {0};
/* 加載溫度顯示數(shù)據(jù) */
ut = BMP085_ReadTemp();
x1 = ((long)ut - ac6) * ac5 >> 15;
x2 = ((long) mc << 11) / (x1 + md);
b5 = x1 + x2;
temperature = (b5 + 8) >> 4;
dis_temp[0] = temperature%1000/100 + 0x30;
dis_temp[1] = temperature%100/10 + 0x30;
dis_temp[2] = '.';
dis_temp[3] = temperature%10 + 0x30;
for (i=0; i<4; i++) {
SMS_Content[5+i] = dis_temp[i]; //加載數(shù)據(jù)到待發(fā)送短信
// SMS_Content[50] = "Temp:22.2, Pres:101.3KPa, Humi:50%, PM2.5:30ug/m^3";
}
LCD12864_Dis(0, 3, dis_temp);
/* 加載壓強(qiáng)顯示數(shù)據(jù) */
up = BMP085_ReadPressure();
b6 = b5 - 4000;
x1 = (b2 * (b6 * b6 >> 12)) >> 11;
x2 = ac2 * b6 >> 11;
x3 = x1 + x2;
b3 = (((long)ac1 * 4 + x3) + 2)/4;
x1 = ac3 * b6 >> 13;
x2 = (b1 * (b6 * b6 >> 12)) >> 16;
x3 = ((x1 + x2) + 2) >> 2;
b4 = (ac4 * (unsigned long) (x3 + 32768)) >> 15;
b7 = ((unsigned long) up - b3) * (50000 >> OSS);
if( b7 < 0x80000000)
p = (b7 * 2) / b4 ;
else
p = (b7 / b4) * 2;
x1 = (p >> 8) * (p >> 8);
x1 = (x1 * 3038) >> 16;
x2 = (-7357 * p) >> 16;
pressure = p + ((x1 + x2 + 3791) >> 4);
if (pressure > 100000) {
dis_temp[0] = pressure/100000 + 0x30;
dis_temp[1] = pressure%100000/10000 + 0x30;
dis_temp[2] = pressure%10000/1000 + 0x30;
dis_temp[3] = '.';
dis_temp[4] = pressure%1000/100 + 0x30;
dis_temp[5] = pressure%100/10 + 0x30;
dis_temp[6] = 'K';
dis_temp[7] = 'P';
dis_temp[8] = 'a';
} else {
dis_temp[0] = 0x20; // 空格
dis_temp[1] = pressure%100000/10000 + 0x30;
dis_temp[2] = pressure%10000/1000 + 0x30;
dis_temp[3] = '.';
dis_temp[4] = pressure%1000/100 + 0x30;
dis_temp[5] = pressure%100/10 + 0x30;
dis_temp[6] = 'K';
dis_temp[7] = 'P';
dis_temp[8] = 'a';
}
for (i=0; i<6; i++) {
SMS_Content[16+i] = dis_temp[i];
}
LCD12864_WriteCmd(0x8b);
for(i=0; i<9; i++)
LCD12864_WriteDat(dis_temp[i]);
}

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