Problem with ADC using ST72F324J2

[fred2]

Posted on April 22, 2004 at 07:17

Problem with ADC using ST72F324J2

[fred2]

Posted on April 21, 2004 at 09:41

Hi!

I have just started to use the Metrowerks CodeWarrior C compiler and have a problem with the A/D CONVERTER.

I want to use the AIN2, AIN3, AIN4, AIN5. (PD2 to PD5 ST72F324J2)

When i use only one channel, All is ok.

But when i want to make the acquisition of one channel after one channel, it's not ok.

I have a function that is named Adc()

void Adc(void)

{

ADCCSR = 0x22; // Channel 2

while (!(ADCCSR & 0x07));

In_ana2 = ADCDRH;

ADCCSR = 0x23; // Channel 3

while (!(ADCCSR & 0x07));

In_ana3 = ADCDRH;

ADCCSR = 0x24;

and so

...

}

If i use only anyone channel the acquisiton in the variable In_anaX is correct.

But if use all the channel, the acqusition in the variable is false.

What is my mistake?

/Fred.B

[jatin]

Posted on April 21, 2004 at 14:02

For checking the End of conversion you have to use

while (!(ADCCSR & 0x80));

But you are using ''while (!(ADCCSR & 0x07));''.

You can also download the ST7 software library to have the ''ADC code'' from the same site.

[fred2]

Posted on April 21, 2004 at 14:43

Hello,

Thanks Jatin.

Could you give me the links to the ST7 software library because i have found in this site the AN979 but in this apllication note there is only the main code and it refers to the library. Example ADC_Enable();. The problem was the link :http://cmg.st.com/stonline/products/cmg/mcd/st7.html (ST7 software library version1.1). It doesn't match.

So could you give me the right link to download the ST7 software library included ADC_Enable() for the ST72F324

Fred.B

[jatin]

Posted on April 22, 2004 at 07:17

In the Main Menu Click - Downloads -> St7Microcontrollers -> Software-Microcontrollers->ST7 Software Library