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simultaneous sampling using two separate ADC units

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saochandan

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Hi all

I am using Fujitsu FM3 MB9BF506R microcontroller which consists cortexM3 processor and 3 ADC units.
I am trying to make use of 2 ADCs out of three. I am reading the conversion result from both ADCs one by one.

I want to get the sampling result simultaneously.
How I can be assure that sampling of inputs occurring simultaneously or one after another?


Here is my dual timer interrupt handler function:

Code C - [expand]
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void DT_QDU_IRQHandler(void)
{
 
/* To check both ADCs are running */
 
if((1 != (IOREG_ADSR_U0 &0x1)) || (1 != (IOREG_ADSR_U1 &0x1)))  
{
 
/* reading 1st channel*/
AD_Data_temp = IOREG_SCFD_U0;         // To gets the contents(input data) of SCFD registers
AD_Data_temp = AD_Data_temp >> 20;   //  To get 12 MSBs which holds 12 bit conversion result
 
/* reading 2nd channel*/
AD_Data_temp1 = IOREG_SCFD_U1;         // To gets the contents(input data) of SCFD registers
AD_Data_temp1 = AD_Data_temp1 >> 20;   //  To get 12 MSBs which holds 12 bit conversion result
 
}
 
    IOREG_SCCR_U0 |= 0x01;         // To restart ADC0 conversion
    IOREG_SCCR_U1 |= 0x01;         // To restart ADC1 conversion
 
}
Timer1IntClr = 1;
}



Is above code is correct way of reading simultaneous ADC values. If not, then please give me some solution so that I can get simultaneous sampling.



Thank you
 
Last edited by a moderator:

where is your ADC initialisation .. the ADC clock rate will determine sampling frequency
if both ADC's use same clock rate .. u can achieve simultaneous sampling
 

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