My learning thread - thanks everyone

it is an 16 bit no mean it is int
FF=MSB byte
FE=LSB byte

ah okay thanks majoka but how do i convert that to binary?

0xFFFE = 1111 1111 1111 1110 

is it the same way in converting to decimal?? if not how?




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another question majoka.

what is the difference if i put a void inside the parentheses? what is the difference of the two functions actually?

void stop_datalog(void); 

void stop_datalog();

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what does this line below means u8 * data? why using u8 * data??

void datalog_sm(u8 * data)

romel_emperado

0xFFFE = 1111 1111 1111 1110

yes it is right every hex no in fact is represented in the binary form so u not need to convert it conversion is done normally from decimal to hexa decimal and hexa decimal to decimal
let say a register has value 0xff
a=0xff
now it is also equal to a=255
even we not convert it
if convert to ascii then
(a/100)+0x30=msb byte of 255 mean 2+0x30=32 it is ascii of 2
(a/10)%10=5+0x30=mid byte of 255 =ascii of 5
(a%10)=5+0x30=ascii of 5

void stop_datalog(void);
and
void stop_datalog();

it has same meaning when we leave braces empty compiler understand it as void

u8 * data?

it is equal to like as

unsigned char * data;

it is pointer type variable name as data

void datalog_sm(u8 * data)

here pointer is passing to a function

thanks so much majoka

I'll ask you more later if I see some lines I dont understand.. thanks

welcome romel ur welcome

guys can you understand this? this code is actually saving recorded data into a file.. i dont understand some lines..

# Get the next data set bytes
      set byte0     [lindex $hex_arr $i]
      set byte1     [lindex $hex_arr [expr $i+1]]
      set byte2     [lindex $hex_arr [expr $i+2]]  
      set byte3     [lindex $hex_arr [expr $i+3]]
      set rec_hr    0 
      set rec_temp  0 
      set rec_alt   0 

      # Decode data
      switch $rec_mode {
        0x01 { # HR
            set rec_hr      [format %d $byte0]
          }
        0x02 { # TEMP
            set rec_temp    [format %2.1f [expr [format %2.1f [expr (($byte0<<8) | $byte1)]]/10]]
            # Move to next data set        
            set i [expr $i+2-1]
          }
        0x04 { # ALT
            set rec_alt     [format %d [expr ($byte0<<8) | $byte1]]
            # Move to next data set        
            set i [expr $i+2-1]
          }
        0x07 { # HR + TEMP + ALT
            set rec_hr      [format %d $byte0]
            set rec_temp    [format %2.1f [expr [format %2.1f [expr (($byte1<<4) | (($byte2>
>
4)&0x0F))]]/10]]
            set rec_alt     [format %d [expr (($byte2&0x0F)<<8) | $byte3]]
            # Move to next data set        
            set i [expr $i+4-1]
          }
        0x03 { # HR + TEMP
            set rec_hr      [format %d $byte0]
            set rec_temp    [format %2.1f [expr [format %2.1f [expr (($byte1<<8) | $byte2)]]/10]]
            # Move to next data set        
            set i [expr $i+3-1]
          }
        0x05 { # HR + ALT
            set rec_hr      [format %d $byte0]
            set rec_alt    [format %d [expr ($byte1<<8) | $byte2]]
            # Move to next data set        
            set i [expr $i+3-1]
          }
        0x06 { # TEMP + ALT
            set rec_temp    [format %2.1f [expr [format %2.1f [expr (($byte0<<4) | (($byte1>
>
4)&0x0F))]]/10]]
            set rec_alt     [format %d [expr (($byte1&0x0F)<<8) | $byte2]]
            # Move to next data set        
            set i [expr $i+3-1]
          }
        }
        
        # Convert metric temperature and altitude to Imperial units 
        if { $sync_use_metric_units == 0 } {
          set rec_temp [format %2.1f [expr ($rec_temp*9)/5+32]]
          set rec_alt  [format %.0f [expr $rec_alt*3.28084]]
        }

        # Write data set to file
        puts $wp "[clock format $start_time -format {%d.%m.%Y}],[clock format $start_time -format {%H:%M:%S}],$rec_hr,$rec_temp,$rec_alt"
      
        # Calculate time for next data sample
        set start_time  [expr $start_time + $rec_interval]
    }
  }
  close $wp
  
  after 500
  updateStatusSYNC "Data download finished."
}

example what is the function of this?

if { $sync_use_metric_units == 0 } {
          set rec_temp [format %2.1f [expr ($rec_temp*9)/5+32]]
          set rec_alt  [format %.0f [expr $rec_alt*3.28084]]

I dont know what programming language it is..
seems like its parsing data coming in a specific format and then storing it in file..

for the second one..
set rec_temp [format %2.1f [expr ($rec_temp*9)/5+32]]

%2.1 means.. 2 digits before and 1 digit after decimal. rec_temp is a string variable.

similarly
rec_alt [format %.0f [expr $rec_alt*3.28084]]

it formats the result with no decimal point. i donno he could have used %d instead

thanks ajay... that's a Tk language.. it's very weird...

that is my base code and im going to write a new code in python with similarity of that..lol

I also dont know python... WTF!

this is the last part of my task after this Its done.. lol

python thing is going around in my office too its really weird language

python thing is going around in my office too

Ajay Bhargav

I knew there were a lot of snakes in India,
but I didn't realise you had them in your offices !

haha... nice one! just trying to get control over python