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Possible bug on ADC

Question asked by Teckna Teckna on Jun 22, 2012
Latest reply on Jun 22, 2012 by David E Seymour

I'm using MQX 3.8, CW 10.2 and a custom board based on K60N512.

 

If I open the ADC channel with the ADC_CHANNEL_ACCUMULATE attribute set, the driver accumulate all samples from one sequence into one value.

The problem is that the buffer is accumulated in a buffer (result) defined as ADC_VALUE_TYPE, that is defined as uint_16 (16 bits wide)

 

adc_ch->g.buffer_driver->result += adc_ptr->R[ch_num]; (file adc_kadc.c, line 635)

 

The Kinetis ADC module is 16 bits wide, than the values cannot be accumulated otherwise an overflow error can occur.

 

Is this right?

 

Many thanks

Teckna

 

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