MAX30205.cpp

00001 #include "mbed.h"
00002 #include "MAX30205.h"
00003 
00004 /**
00005  * Internal Registers
00006  * The device contains four registers,
00007  * each of which consists of 2bytes.
00008  * The configuration register contains only 1 byte of
00009  * actual data and, when read as a 2-byte register,
00010  * repeats the same data for the second byte.
00011  */
00012  
00013 #define REG_TEMP  0x00
00014 #define REG_CONF  0x01
00015 #define REG_THYST 0x02
00016 #define REG_TOS   0x03
00017 
00018 MAX30205::MAX30205(PinName sda, PinName scl, int addr): m_i2c(sda, scl), m_addr(addr<<1) 
00019 {
00020     // activate the peripheral
00021 }
00022 
00023 MAX30205::~MAX30205()
00024 {
00025 }
00026 
00027 uint16_t MAX30205::getTemp(void) 
00028 {
00029     uint16_t temp ;
00030     uint8_t data[2] ;
00031     readRegs(REG_TEMP, data, 2) ;
00032     temp = (data[0] << 8) | data[1] ;
00033     return(temp) ;
00034 }
00035 
00036 uint8_t MAX30205::getConf(void)
00037 {
00038     uint8_t data[2] ;
00039     readRegs(REG_CONF, data, 2) ;
00040     return(data[0]) ;
00041 }
00042 
00043 void MAX30205::setConf(uint8_t conf)
00044 {
00045     uint8_t data[3] ;
00046     data[0] = REG_CONF ;
00047     data[1] = conf ;
00048     data[2] = conf ;
00049     writeRegs(data, 3) ;
00050 }
00051 
00052 uint16_t MAX30205::getThyst(void)
00053 {
00054     uint16_t thyst ;
00055     uint8_t data[2] ;
00056     readRegs(REG_THYST, data, 2) ;
00057     thyst = (data[0] << 8) | data[1] ;
00058     return(thyst) ;
00059 }
00060 
00061 void MAX30205::setThyst(uint16_t thyst)
00062 {
00063     uint8_t data[3] ;
00064     data[0] = REG_THYST ;
00065     data[1] = (thyst >> 8) & 0xFF ;
00066     data[2] = thyst & 0xFF ;
00067     writeRegs(data, 3) ;
00068 }
00069 
00070 uint16_t MAX30205::getTos(void)
00071 {
00072     uint16_t tos ;
00073     uint8_t data[2] ;
00074     readRegs(REG_TOS, data, 2) ;
00075     tos = (data[0] << 8) | data[1] ;
00076     return(tos) ;
00077 }
00078 
00079 void MAX30205::setTos(uint16_t tos)
00080 {
00081     uint8_t data[3] ;
00082     data[0] = REG_TOS ;
00083     data[1] = (tos >> 8) & 0xFF ;
00084     data[2] = tos & 0xFF ;
00085     writeRegs(data, 3) ;
00086 }
00087 
00088 void MAX30205::readRegs(int addr, uint8_t * data, int len) {
00089     char t[1] = {addr};
00090     m_i2c.write(m_addr, t, 1, true);
00091     m_i2c.read(m_addr, (char *)data, len);
00092 }
00093 
00094 void MAX30205::writeRegs(uint8_t * data, int len) {
00095     m_i2c.write(m_addr, (char *)data, len);
00096 }