RM0008 Analog-to-digital converter (ADC)
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The software source trigger events can be generated by setting a bit in a register
(SWSTART and JSWSTART in ADC_CR2).
A regular group conversion can be interrupted by an injected trigger.
10.8 DMA request
Since converted regular channels value are stored in a unique data register, it is necessary
to use DMA for conversion of more than one regular channel. This avoids the loss of data
already stored in the ADC_DR register.
Only the end of conversion of a regular channel generates a DMA request, which allows the
transfer of its converted data from the ADC_DR register to the destination location selected
by the user.
Note: Only ADC1 and ADC3 have this DMA capability. ADC2-converted data can be transferred in
dual ADC mode using DMA thanks to master ADC1.
Table 46. External trigger for regular channels for ADC3
Source Connection type EXTSEL[2:0]
TIM3_CC1 event
Internal signal from on-chip
timers
000
TIM2_CC3 event 001
TIM1_CC3 event 010
TIM8_CC1 event 011
TIM8_TRGO event 100
TIM5_CC1 event 101
TIM5_CC3 event 110
SWSTART Software control bit 111
Table 47. External trigger for injected channels for ADC3
Source Connection type JEXTSEL[2:0]
TIM1_TRGO event
Internal signal from on-chip
timers
000
TIM1_CC4 event 001
TIM4_CC3 event 010
TIM8_CC2 event 011
TIM8_CC4 event 100
TIM5_TRGO event 101
TIM5_CC4 event 110
JSWSTART Software control bit 111
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