AN3023

Configuring ADC registers for conversion

Doc ID 16113 Rev 1

11/23

For Example 1, the ADC registers should be configured as follows:

ADC_CR1:SPSEL[2:0] = 010

ADC_CSR:CH[3:0] = 0001

ADC_CR1:ADON = 1

ADC_CR1:CONT = 0

Note:

Do not perform the operation “ADC_CR1:CONT = 0

CONT bit is already 0 (see note in Section 3.1.2).

ADC_CR2:ALIGN = 0

ADC_CR1:ADON = 1

Wait (ADC_CSR:EOC = 1)

See the result of the conversion in ADC data registers ADC_DRH and ADC_DRL.

Continuous conversion mode

In continuous conversion mode, the ADC starts another conversion as soon as it finishes

the last one. A new conversion starts automatically. For this conversion mode, set the CONT

bit to ‘1’ in the ADC_CR1 register.

Example 2

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Channel = AIN2

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Continuous conversion model, right alignment

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Starting ADC by external trigger event on ADC_ETR pin

For Example 2, the ADC registers should be configured as follows:

ADC_CR1:SPSEL[2:0] = 010

ADC_CSR:CH[3:0] = 0010

ADC_CR1:ADON = 1

ADC_CR1:CONT = 1

ADC_CR2:ALIGN = 1

ADC_CR2:EXTSEL[1:0] = 01

ADC_CR2:EXTTRIG = 1

Rising edge on ADC_ETR pin

Wait (ADC_CSR:EOC = 1)

If you want to save the result of the current conversion, save the values of data register

ADC_DRH and ADC_DRL before starting the next conversion.