Using ADC on STM32
Using Analog to Digital Converter on STM32
Software Trigger Polling Mode
Set External Trigger Conversion Source to be "Regular Conversion launched by software"

HAL_ADC_Start(&hadc1);
HAL_StatusTypeDef status = HAL_ADC_PollForConversion(&hadc1, 100);
uint32_t value = (int32_t)HAL_ADC_GetValue(&hadc1);
Timer Triggered Mode
It is more convenient to use injected channel.

Configure Timer 2 to generate reset event on TRGO at 1 kHz.
The 1 kHz is calculated from APB1_TIMER_CLOCKS / (PSC + 1) / (ARR + 1)
:

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