[ARM] ADC in triple interleaved mode (STM32F407)

[vanika]

Hello !

My problem is to run Triple Mode, and generally want a detailed understanding of its boundary opportunities, see what you can squeeze out of this module, to build some graphics of his work, etc.

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// setup adc 1
 
ADC1->CR2 |= ADC_CR2_ADON;  // on АЦП 1
ADC1->CR2 |= ADC_CR2_CONT ; // Continuos mode 
ADC1->SQR3 |= ADC_SQR3_SQ1_0;   // select channel 1 for adc 1 (РА1)
ADC1->CR1 &= ~ADC_CR1_RES;  // setup resolution 
ADC1->SQR1 &= ~ADC_SQR1_L;
ADC1->CR2 &= ~ADC_CR2_ALIGN; // allign 'right'
ADC1->CR2 &= ~ADC_CR2_EXTEN;    
//ADC1->CR2 |= ADC_CR2_SWSTART; // run!
 
// setup adc 2
 
ADC2->CR2 |= ADC_CR2_ADON;  // on ADC 2
ADC2->CR2 |= ADC_CR2_CONT ; // Continuos mode 
ADC2->SQR3 |= ADC_SQR3_SQ1_0;   // select channel 1 for adc 2 (РА1)
ADC2->CR1 &= ~ADC_CR1_RES;  // setup resolution 
ADC2->SQR1 &= ~ADC_SQR1_L;
ADC2->CR2 &= ~ADC_CR2_ALIGN; // allign 'right'
ADC2->CR2 &= ~ADC_CR2_EXTEN;    // 
//ADC2->CR2 |= ADC_CR2_SWSTART; // run!
 
// setup adc 3
 
ADC3->CR2 |= ADC_CR2_ADON;  // on ADC 3
ADC3->CR2 |= ADC_CR2_CONT ; // Continuos mode 
ADC3->SQR3 |= ADC_SQR3_SQ1_0;   // select channel 1 for adc  3 (РА1)
ADC3->CR1 &= ~ADC_CR1_RES;  // setup resolution 
ADC3->SQR1 &= ~ADC_SQR1_L;
ADC3->CR2 &= ~ADC_CR2_ALIGN;    // allign 'right'
ADC3->CR2 &= ~ADC_CR2_EXTEN; // 
//ADC3->CR2 |= ADC_CR2_SWSTART; // run!
 
// Triple MODE 
 
ADC->CCR = 0x17; //  Triple MODE 
 
ADC1->CR2 |= ADC_CR2_SWSTART;   // RUN!

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Actually, the result is the simultaneous operation of all three ADC, but in the data register Multi Mode CDR can be observed only zeros...



This result is obtained when the input sine wave has a frequency of about 7 kHz. It seems to me that I overlooked in the field sample rate.
Correct if I'm wrong