ADD: SD Card variable write length

[andrewjaykeller]

Be able to send a string command in the form of hours and minutes to at runtime declare a block write size.

[yj-xxxiii]

Something like that AJ?
Full code from : https://github.com/yj-xxxiii/OpenBCI_2kHz
------ Define the duration of the record session.

   To do this, send an 'hxxhxx>' .

    ex : 'h1h>'        sets to 1 hour
         'h2h30>'     sets to 2 hours 30 minutes.
         'hh5>'         sets to                5 minutes.
         'hh99h'       sets to 1 hour  39 minutes.
         'hh125>'     sets to 2 hours  5 minutes.
         'hh1234>'   sets to 2 hours 34 minutes!!
         'hh12345>' sets to 7 hours 45 minutes!!! The code is minimalist, so stay inside ' xxhxx '

   this command echoes 
         - the duration formated as 'xxhxx'
         - the corresponding closest number of blocks according to the current sample rate and the recording format (hex/bin)

case waiting_duration_value: 
    if(testChar == '>') { 
        SessionSize = (SessionTime*60*(250<<(0b110-Sample_Rate_SD_Only)))/512 ;     
        SessionSize *= (Bin_format ? 32 : 80) ;
        Serial0.print(SessionTime/60); 
        Serial0.print("h"); 
        Serial0.print((SessionTime%60)/10); 
        Serial0.println(SessionTime%10);                                 delay(10);
        Serial0.print(SessionSize); Serial0.println(" blocks");    delay(10);
        command_state = waiting_command_beginning ;
        break ; 
    } 
    if(testChar == 'h') {
        SessionTime *= 60 ;
        break ; 
    }
    if(!(('0' <= testChar) && (testChar <= '9')) ) { 
        Serial0.println(" Error, do it again"); delay(10); 
        command_state = waiting_command_beginning ;     break ; 
    } else { 
        SessionTime += ((SessionTime%60)*9) + (testChar-'0') ; 
        break ; 
    } 

(sorry cant format the code... y.j.)

[andrewjaykeller]

Updated the formatting @yj-xxxiii you can click the "pencil" to see how to work with github markup.

I think what you wrote is right on the money!