STM32CubeF1 V1.8.7: HAL_ADCEx_MultiModeStop_DMA() clears DUALMOD, contradicting its header comment
The function comment of HAL_ADCEx_MultiModeStop_DMA() states "Multimode is kept enabled after this function" (in stm32f1xx_hal_adc_ex.c, line 792).
However, in the F1 implementation (stm32f1xx_hal_adc_ex.c, line 841) the function actively executes:
CLEAR_BIT(hadc->Instance->CR1, ADC_CR1_DUALMOD);
which is misleading.
So, on STM32F1 the dual ADC mode is silently lost on every stop using HAL_ADCEx_MultiModeStop_DMA(). Users should call HAL_ADCEx_MultiModeConfigChannel() every time before the next start, or the buffer of ADC won’t receive any data on the high 16 bits.
Suggestion: update the F1 header comment to state that DUALMOD is cleared and must be re-configured, or align the F1 implementation with its comment (keep DUALMOD, disable multimode only via HAL_ADC_ReInit).
Happy to provide a minimal reproducer.