PeMod_BMP180.cpp

00001 #include "SysConfig.h"
00002 
00003 #define BMP180_ADDR          (0x40<<1)   //BMP180 address
00004 #define BMP180_CMD_TMP_NH    (0xF3)      //Non-hold temp trigger command
00005 #define BMP180_CMD_RH_NH     (0xF5)      //Non-hold temp trigger command
00006 
00007 #define i2c_bmp180 i2c_sen
00008 //#define uart_db uart_pc
00009 
00010 int BMP180_Init(void)
00011 {
00012     return 0;    
00013 }
00014 
00015 float BMP180_ReadTemp(void)
00016 {
00017     char cmd = BMP180_CMD_TMP_NH, data[3]; 
00018     float temp;
00019     
00020     i2c_bmp180.write(BMP180_ADDR, &cmd, 1, 1);
00021     wait_us(20);
00022     i2c_bmp180.stop();
00023     
00024     wait_ms(100);
00025     i2c_bmp180.read(BMP180_ADDR, data, 3);
00026     #if defined uart_db
00027     uart_db.printf("\n\rBMP180 return 0x%02X 0x%02X 0x%02X\n\r", data[0], data[1], data[2]);
00028     #endif
00029     temp = (256.0 * data[0] + data[1]) * 175.72 / (0x1 << 16) - 46.85;
00030     return temp;
00031 }
00032 
00033 float BMP180_ReadRh(void)
00034 {
00035     char cmd = BMP180_CMD_RH_NH, data[3]; 
00036     float rh;
00037     
00038     i2c_bmp180.write(BMP180_ADDR, &cmd, 1, 1);
00039     wait_us(20);
00040     i2c_bmp180.stop();
00041     
00042     wait_ms(100);
00043     i2c_bmp180.read(BMP180_ADDR, data, 3);
00044     #if defined uart_db
00045     uart_db.printf("\n\rBMP180 return 0x%02X 0x%02X 0x%02X\n\r", data[0], data[1], data[2]);
00046     #endif
00047     rh = (256.0 * data[0] + data[1]) * 125 / (0x1 << 16) - 6;
00048     return rh;    
00049 }