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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <ctype.h> //# isdigit()
#include "lm75.h"
#include "deftypes.h"
extern uint16 devicef;
extern void bus_err(int ern);
extern void print_help(void);
extern uchar *xchg_data (uchar *buf, uint8 wrlen, uint8 waitlen, uint8 rdlen);
uchar buf[32];
void lm75_print_all(void)
{
printf(
"============ LM75xx interface ===========\n"
"Registers:\n"
" 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"
"Configuration:\n"
" tos: Over-Temperature register [-55°C...+125°C]\n"
" thys: Temperature-hysteresis register [-55°C...+125°C]\n"
" conf: Configuration register [hexadecimal]\n"
" sleep: Set idle mode [on/off]\n"
" mode: Comparator/Interrupt mode [comp/int]\n"
" tos_pol: Tos pin polarity (Low/High) [Al/Ah]\n"
" fault_q: Fault queue length [1/2/4]\n"
"\n");
}
// uchar *xchg_data (uchar *buf, uint8 wrlen, uint8 waitlen, uint8 rdlen){ //# [buf] = 32 byte
// if(write(devicef, buf, wrlen) != wrlen){ //# write one byte to device
// bus_err(errno);
// }
// usleep(waitlen*1000); //# Wait 10ms for reading
// if(read(devicef, buf, rdlen) != rdlen) { //# read the result
// bus_err(errno);
// }
// return buf;
// }
static float calc_temp(float offset){ // Calculate temperature
uint16 rawtemp = 0; //# Signed by default
float temp;
buf[0] = 0x00; //# Measurement in the REG[0]
xchg_data(buf,1,0,2); //# Write: 1byte addr, Read: 2byte data, Wait:0, [buf] = 32 byte
rawtemp = (buf[0]*256 + buf[1]) >> 5; //# /x*256 == x << 8/ (>> 5): Temp is 11bit data register
if((rawtemp & 0x400) == 0x400){ //# check if the msb(bit11) is 1 (1024 = 0x400), 2'complement negative number
rawtemp = ~rawtemp + 1; //# 2'complement data
rawtemp = rawtemp & 0x7ff; //# Only the lowest 11bit needed
temp = -1 * rawtemp * 0.125 ;
} else {
temp = rawtemp * 0.125 ; //# 11bit -> 0.125°C or 9bit -> 0.5°C
}
return (temp + offset);
}
static float read_tos(void){ // Over-Temperature Shutdown register
uint16 rawtemp = 0; //# Int16 default signed
buf[0] = 0x03; //# Tos = REG[2]
xchg_data(buf,1,0,2);
rawtemp = buf[0]*256 + buf[1]; // x*256 == x << 8
rawtemp = (rawtemp) >> 7; //# 9bit data
if((rawtemp & 0x100) == 0x100){ //# check MSB if it's a 2'complement number
rawtemp = ~rawtemp + 1 ; //# 2'complement, 2^9 = 512;
rawtemp = rawtemp & 0x1FF; //# lowest 9 bit
return (-1 * rawtemp * 0.5);
} else {
return (rawtemp * 0.5); //# 9bit -> 0.5 celsius
}
}
static float read_thys(void){ // Over-Temp Hysteresis Register
uint16 rawtemp = 0; //# signed
buf[0] = 0x02;
xchg_data(buf,1,0,2); //# read from REG[3]
rawtemp = (buf[0] << 8) + buf[1];
rawtemp = (rawtemp) >> 7; //# 9bit data
if((rawtemp & 256) == 256){ //# 256 = 0x100
rawtemp = ~rawtemp + 1 ; //# 2'complement, 2^9 = 512;
rawtemp = rawtemp & 0x1FF; //# lowest 9 bit
return (-1 * rawtemp * 0.5);
}
return (rawtemp * 0.5); //# 9bit -> 0.5 celsius
}
static uchar read_conf(void){ //Configuration register
buf[0] = 0x01;
xchg_data(buf,1,0,1);
return buf[0];
}
void lm75_read_all(const uchar *opts){ // Print out whole device's data
// if(opts != NULL)
// {
// printf("00:%f\n", calc_temp(strtof(opts, NULL)));
// } else {
printf("00:%f\n", calc_temp(0.0));
// }
printf("01:0x%x\n", read_conf());
printf("02:%f\n", read_thys());
printf("03:%f\n", read_tos());
}
void lm75_read_one(const uchar *opts){ // Prints the selected register's data
uint16 id,i;
uchar temp[256];
if(opts != NULL){ //# Search the comma: ...<01,-11.24>
for(i = 0; i < strlen((char*)opts); i++){
if (*(opts+i) == ','){
break;
} else {
if( !isdigit(*(opts+i)) ){ //# Check the register string
printf("The Register address must be an integer!\n");
print_help();
lm75_print_all();
exit (EXIT_FAILURE);
}
temp[i] = *(opts+i); //# copy register string
temp[i+1] = '\0';
}
}
id = atoi((char*)temp); //# Convert register to number
strncpy((char*)temp, (char*)opts+i+1, 255); //# Copy remain to temp
switch (id) //# Which register is selected?
{
case 0x00:
printf("%f\n", calc_temp(atof((char*)temp))); //# with the offset
break;
case 0x01:
printf("0x%x\n", read_conf());
break;
case 0x02:
printf("%f\n", read_thys());
break;
case 0x03:
printf("%f\n", read_tos());
break;
default:
print_help();
}
}
}
void lm75_conf_set(const uchar *opts){ // Prints the selected register's data
uint16 i;
uchar temp[256];
if(opts != NULL){
for(i = 0; i < strlen((char*)opts); i++){
if (*(opts+i) == ','){ //# .... conf_set 0x49 thys,-10.5
break;
}
temp[i] = *(opts+i);
temp[i+1] = '\0';
}
if(!strcmp("tos", (char*)temp)){ //# Set the Tos register value
float inp;
uint16 temp;
buf[0] = 0x03;
inp = atof( (char*)(opts+i+1));
if(inp < 0){
temp = 0 - inp/0.5;
temp = ~temp +1; //# 2'complement
buf[1] = (temp >> 1) & 0xFF; //# (x << 7) and (x >> 8) ==> (x >> 1)
buf[2] = ((temp << 7) | 0x7F) & 0xFF; //# |d8,d7,d6,d5|d4,d3,d2,d1|d0,xx,xx,xx|xx,xx,xx,xx|
} else {
temp = inp/0.5;
buf[1] = (temp >> 1) & 0xFF; //# (x << 7) and (x >> 8) ==> (x >> 1)
buf[2] = (temp << 7) & 0xFF;;
}
xchg_data(buf,3,0,2);
}else if(!strcmp("thys", (char*)temp)){ //# Set the Thys reg
float inp;
uint16 temp;
buf[0] = 0x02;
inp = atof( (char*)(opts+i+1));
if(inp < 0){
temp = 0 - inp/0.5;
temp = ~temp +1; //# 2'complement
buf[1] = (temp >> 1) & 0xFF; //# (x << 7) and (x >> 8) ==> (x >> 1)
buf[2] = ((temp << 7) | 0x7F) & 0xFF; //# |d8,d7,d6,d5|d4,d3,d2,d1|d0,xx,xx,xx|xx,xx,xx,xx|
} else {
temp = inp/0.5;
buf[1] = (temp >> 1) & 0xFF; //# (x << 7) and (x >> 8) ==> (x >> 1)
buf[2] = (temp << 7) & 0xFF;;
}
xchg_data(buf,3,0,2);
}else if(!strcmp("conf", (char*)temp)){ //# Set whole conf register
buf[0] = 0x01;
buf[1] = strtol((char*)(opts+i+1),NULL,0);
xchg_data(buf,2,0,1);
}else if(!strcmp("sleep", (char*)temp)){ //# Send the sleep command
buf[0] = 0x01;
xchg_data(buf,1,0,1);
if (!strcmp("on",(char*)opts+i+1))
{
buf[1] = buf[0] | 0x01;
}
else if(!strcmp("off",(char*)opts+i+1))
{
// buf[1] = ~buf[0]; //# XOR = NEG->OR->NEG
// buf[1] = buf[1] | 0b00000001; //# Invert->add->invert
// buf[1] = ~buf[1];
buf[1] = buf[0] ^ 0b00000001; //# XOR to clear the bit
}
else
{
lm75_print_all();
exit(EXIT_FAILURE);
}
buf[0] = 0x01;
xchg_data(buf,2,0,1);
}else if(!strcmp("mode", (char*)temp)){ //# Comparator/Interrupt mode
buf[0] = 0x01;
xchg_data(buf,1,0,1);
if (!strcmp("comp",(char*)opts+i+1))
{
buf[1] = buf[0] ^ 0b00000010; //# XOR to clear
}
else if(!strcmp("int",(char*)opts+i+1))
{
buf[1] = buf[0] | 0b00000010;
}
else
{
lm75_print_all();
exit(EXIT_FAILURE);
}
buf[0] = 0x01;
xchg_data(buf,2,0,1);
}else if(!strcmp("tos_pol", (char*)temp)){ //# Tos polarity
buf[0] = 0x01;
xchg_data(buf,1,0,1);
if (!strcmp("Al",(char*)opts+i+1))
{
buf[1] = buf[0] ^ 0b00000100; //# XOR to clear the bit
}
else if(!strcmp("Ah",(char*)opts+i+1))
{
buf[1] = buf[0] | 0b00000100;
}
else
{
lm75_print_all();
exit(EXIT_FAILURE);
}
buf[0] = 0x01;
xchg_data(buf,2,0,1);
}else if(!strcmp("fault_q", (char*)temp)){ //# Tos Fault Queue
buf[0] = 0x01;
xchg_data(buf,1,0,1);
if (!strcmp("1",(char*)opts+i+1))
{
buf[1] = buf[0] | 0b00011000; //# Add and clear whole section
buf[1] = buf[1] ^ 0b00011000;
}
else if(!strcmp("2",(char*)opts+i+1))
{
buf[1] = buf[0] | 0b00011000; //# Clear first
buf[1] = buf[1] ^ 0b00011000; //# Clear first
buf[1] = buf[1] | 0b00001000; //# Set
}
else if(!strcmp("4",(char*)opts+i+1))
{
buf[1] = buf[0] | 0b00011000; //# Clear first
buf[1] = buf[1] ^ 0b00011000; //# Clear first
buf[1] = buf[1] | 0b00010000; //# Set
}
else
{
lm75_print_all();
exit(EXIT_FAILURE);
}
buf[0] = 0x01;
xchg_data(buf,2,0,1);
} else {
// for(i = 0; i < strlen((char*)opts); i++ ){
// if( !isxdigit(*(opts+i)) || *(opts+i) !='x' || opts[i] != ','){ //# Check the register string
// printf("The Register address, and value must be a hex, or an integer!\n");
print_help();
lm75_print_all();
exit (EXIT_FAILURE);
// }
// }
}
}
}
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