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HX711 ADC 24 bits

 
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hapra

Bascom Member



Joined: 20 Sep 2008
Posts: 27

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PostPosted: Mon Oct 13, 2014 6:30 pm    Post subject: HX711 ADC 24 bits Reply with quote

Hi all,

I hope my question is really new about Chip HX711 ADC 24 bits, in this forum.
I am using ATmega32 MCU with crystal 4Mhz to communicate with HX711 Dual-Channel Weighing Sensor Module, this module image can be found on the internet.
While the HX711 datasheet in http://www.dfrobot.com/image/data/SEN0160/hx711_english.pdf

I am trying to convert from C (page 8th) to Bascom code, but it does not work at all even timing clock is set with different timing.
It means the return value is always 0 (zero).

Can anyone help me, may have a code that has been successfully working?
Thank you in advance.

Original code:

Code:

//********************************************************
//*** C Coding ********************************************
//********************************************************

sbit ADDO = P1^5;
sbit ADSK = P0^0;

unsigned long ReadCount(void){
unsigned long Count;
unsigned char i;

  ADDO=1;
  ADSK=0;
  Count=0;

  while(ADDO);

  for (i=0;i<24;i++){
    ADSK=1;
    Count=Count<<1;
    ADSK=0;
    if(ADDO) Count++;
  }

  ADSK=1;
  Count=Count^0x800000;
  ADSK=0;
  return(Count);
 }
 


My snippet code conversion:

Code:

'********************************************************
'*** Bascom *********************************************
'********************************************************

Adsk Alias Portd.4                                          'I use pin D.4 as output Clock
Addo Alias Portd.5                                          'I use pin D.5 as input Databit
Config Adsk = Output
Config Addo = Input
Dim Count As Long

'-------------------------------------------------------------------------------
Function HX711_Read() As Long
'-------------------------------------------------------------------------------
Local I As Byte

  'ADDO = 1               'I also give quotation marks at this alternately coz as input, not output
  Adsk = 0                                                  'clock LOW
  Count = 0                                                 'reset variable

  While Addo = 1                                            'wait until data ready
  Wend

  'Shiftin ADDO , ADSK , Count , 1 , 24 , 10     --> similar ?
  For I = 1 To 24                                           'channel A, gain 128x
    Adsk = 1                                                'clock HIGH
    Shift Count , Left , 1                                  'shift to left 1 bit
    Adsk = 0                                                'clock LOW
    If Addo = 1 Then Incr Count                             'give bit 1 for LSB, otherwise 0
  Next

  Adsk = 1                                                  'clock HIGH
  Count = Count Xor &H800000                                '0x800000
  Adsk = 0                                                  'clock LOW

  Hx711_read = Count                                        'returned value

End Function

 


(BASCOM-AVR version : 2.0.7.3 , Latest : 2.0.7.7 )
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Evert :-)

Bascom Expert



Joined: 18 Feb 2005
Posts: 2156

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PostPosted: Mon Oct 13, 2014 8:21 pm    Post subject: Reply with quote

Try
Code:

Addo Alias Pind.5                                          'I use pin D.5 as input Databit
 

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Dibor

Bascom Member



Joined: 04 Dec 2004
Posts: 137
Location: ISRAEL

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PostPosted: Tue Oct 14, 2014 11:27 am    Post subject: Reply with quote

Also instead Long use Dword because in C code used unsigned Long(Bascom doesn't has unsigned) so Dword is 32 bit unsigned variable as unsigned Long in C
But if you get value less then 32bit (24 bit for example)you do not need make any changes

Regards.
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hapra

Bascom Member



Joined: 20 Sep 2008
Posts: 27

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PostPosted: Tue Oct 14, 2014 6:49 pm    Post subject: Reply with quote

Hi Evert,
Yes, your suggestion correctly, I had to type Pind.5 not Portd.5
Why I always forget about Portx.y for output bit assignment and Pinx.y for input bit assignment Rolling Eyes
Thank you very much for the correction.

Hi Dibor,
I look at Bascom AVR Help, there is no Dword, but when I try to compile the result is successful, I just realize that Dword actually already supported.
And currently I am still using 24-bits only for this purpose.
Thank you for the very useful information.
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Duval JP

Bascom Member



Joined: 22 Jun 2004
Posts: 1161
Location: France

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PostPosted: Sat Oct 18, 2014 2:27 pm    Post subject: Reply with quote

good work !
when you finish it, it would be nice to share your work with other bascom's users in "Share your working BASCOM-AVR code here"

many thanks
JP Wink
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albertsm

Administrator



Joined: 09 Apr 2004
Posts: 5921
Location: Holland

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PostPosted: Tue Oct 21, 2014 9:57 pm    Post subject: Reply with quote

Quote:
I look at Bascom AVR Help, there is no Dword

Actually it is mentioned in the language Fundamentals section.

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