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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;
    buf[1] = 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
                    fprintf(stderr, "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);
            //     }
            // }
        }
    }
}