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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include "lm75.h"
#include "deftypes.h"
extern uint16 devicef;
extern void bus_err(int ern);
extern void print_help(void);
uchar buf[32];
void lm75_print_all(void)
{
printf(
"00: Temperature data [°C] (reg: 0x00)\n"
"01: Configuration [hex] (reg: 0x01)\n"
"02: Tos (Overtemp) [°C] (reg: 0x03)\n"
"03: Thys (Hysteresis) [°C] (reg: 0x04)\n"
"\n");
}
uchar *read_data( uchar *buf ){ //# [buf] = 32 byte
if(write(devicef, buf, 1) != 1){ //# write one byte to device
bus_err(errno);
}
usleep(10*1000); //# Wait 10ms for reading
if(read(devicef, buf, 2) != 2) { //# read the result
bus_err(errno);
}
return buf;
}
float calculate_temp(float offset){ // Calculate temperature
int16 rawtemp = 0; //# Signed by default
float temp;
buf[0] = 0x00; //# Measurement in the REG[0]
read_data(buf); //# [buf] = 32 byte
rawtemp = (buf[0]*256 + buf[1]) >> 5; // (buf[0] << 8), and (>> 5), Device with 11bit data, is also supported
if((rawtemp & 0x400) == 0x400){ //# check if the msb(bit11) is 1 (1024 = 0x400), 2'complement negative number
rawtemp = rawtemp - 2048; //# 2^11 = 2048
}
temp = rawtemp * 0.125 ; //# 11bit -> 0.125°C or 9bit -> 0.5°C
return (temp + offset);
}
float read_tos(void){ // Over-Temperature Shutdown register
int16 rawtemp = 0; //# Int16 default signed
buf[0] = 0x02; //# Tos = REG[2]
read_data(buf);
rawtemp = buf[0]*256 + buf[1];
rawtemp = (rawtemp) >> 7; //# 9bit data
if((rawtemp & 256) == 256){ //# check MSB if it's a 2'complement number
rawtemp = rawtemp - 512 ; //# 2^9 = 512;
}
return (rawtemp * 0.5); //# 9bit -> 0.5 celsius
}
float read_thys(void){ // Over-Temp Hysteresis Register
int16 rawtemp = 0; //# signed
buf[0] = 0x03;
read_data(buf); //# read from REG[3]
rawtemp = buf[0]*256 + buf[1];
rawtemp = (rawtemp) >> 7; //# 9bit data
if((rawtemp & 256) == 256){
rawtemp = rawtemp - 512 ; //# 2^9 = 512;
}
return (rawtemp * 0.5); //# 9bit -> 0.5 celsius
}
uchar read_conf(void){ //Configuration register
buf[0] = 0x01;
read_data(buf);
return buf[0];
}
void lm75_read_all(const uchar *opts){ // Print out whole device's data
// if(opts != NULL)
// {
// printf("00:%f\n", calculate_temp(strtof(opts, NULL)));
// }
// else
// {
printf("00:%f\n", calculate_temp(0.0));
// }
printf("01:0x%x\n", read_conf());
printf("02:%f\n", read_tos());
printf("03:%f\n", read_thys());
}
void lm75_read_one(const uchar *opts){ // Prints the selected register's data
uint16 id,i;
uchar temp[256];
if(opts != NULL){
for(i = 0; i < strlen((char*)opts); i++){
if (*(opts+i) == ','){
break;
}
temp[i] = *(opts+i);
temp[i+1] = '\0';
}
id = atoi((char*)temp);
strncpy((char*)temp, (char*)opts+i+1, 255);
// id = strtol (opts,&ptr,0); //all format allowed
// ptr++; //one separator allowed
switch (id)
{
case 0x00:
printf("%f\n", calculate_temp(atof((char*)temp)));
break;
case 0x01:
printf("0x%x\n", read_conf());
break;
case 0x02:
printf("%f\n", read_tos());
break;
case 0x03:
printf("%f\n", read_thys());
break;
default:
print_help();
}
}
}
void lm75_conf_set(const uchar *opts){
// printf("");
}
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