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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include "hih61xx.h"
#include "deftypes.h"
extern uint16 devicef;
extern void bus_err(int ern);
extern void print_help(void);
unsigned char buf[5];
void hih61xx_print_all(void)
{
printf(
"00: Relative Humidity [%%] (reg: 0x00)\n"
"01: Temperature [°C] (reg: 0x00)\n"
"02: Status [hex] (reg: 0x00)\n"
"\n");
}
void hih61xx_conf_set(const uchar *opts) {}
void hih61xx_get_data(void) //# Get measurement data from device
{
buf[0] = 0x00;
if(write(devicef, buf, 1) != 1){ //# Start the measurement
bus_err(errno);
}
usleep(60*1000); //# Wait 60ms for measurement
if(read(devicef, buf, 4) != 4){ //# Read the data
bus_err(errno);
}
}
unsigned char hih61xx_read_status(void){ //# Get device status
return ((buf[0] & 0xc0) >> 6); //# He ???
}
float hih61xx_calc_humidity(float offset){ //# Measure
unsigned int raw = 0;
float humidity;
if(hih61xx_read_status() != 0x01 )
{
raw = ((buf[0] & 0x3f) << 8) + buf[1]; // two msb status, 14bit data
humidity = ((float)raw/(16384 - 2))*100; // humidity = (14bit data / (2^14 -2)) * 100%
}
else
{
humidity = -1.0 ;
}
return (humidity + offset) ;
}
float hih61xx_read_temp(float offset)
{
unsigned int raw = 0;
float temp;
if(hih61xx_read_status() != 0x01 )
{
raw = ((buf[2] << 8) + buf[1]) >> 2; // 14bit temp data
temp = ((float)raw/(16384 - 2))*165 - 40 ; // temp = ((14bit data / (2^14 -2))*165) - 40 [°C]
}
else
{
temp = -40.0 ;
}
return (temp + offset);
}
void hih61xx_read_all(const uchar *opts)
{
hih61xx_get_data();
if(opts != NULL)
{
char *ptr;
printf("00:%f\n", hih61xx_calc_humidity(strtof((char*)opts, &ptr)));
ptr++; // One (,) character allowed for delimiter
printf("01:%f\n", hih61xx_read_temp(strtof(ptr, NULL)));
}
else
{
printf("00:%f\n", hih61xx_calc_humidity(0.0));
printf("01:%f\n", hih61xx_read_temp(0.0));
}
printf("02:0x%x\n", hih61xx_read_status());
}
void hih61xx_read_one(const uchar *opts)
{
int id;
char *ptr;
hih61xx_get_data();
id = strtol ((char*)opts,&ptr,0); //all format allowed
ptr++; //one separator allowed
switch (id)
{
case 0x00:
printf("00:%f\n", hih61xx_calc_humidity(strtof(ptr, NULL)));
break;
case 0x01:
printf("01:%f\n", hih61xx_read_temp(strtof(ptr, NULL)));
break;
case 0x02:
printf("02:0x%x\n", hih61xx_read_status());
break;
default:
print_help();
}
}
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