Работа с Keil начинающего освоение программирования STM32

D:\Keil_v5_trial\ARM\Packs\Keil\STM32F1xx_DFP\2.4.1\Device\Include\stm32f10x.h

    // sequence order: 0 -> 1 -> 5 -> 16 -> 17
    ADC1->SQR3 = 0 | (1<<5) | (5<<10) | (16<<15) | (17<<20);
    ADC1->SQR1 = (NUMBER_OF_ADC_CHANNELS - 1) << 20; // amount of conversions
    ADC1->CR1 |= ADC_CR1_SCAN; // scan mode

static inline void adc_setup(){
    GPIOA->CRL |= CRL(0, CNF_ANALOG|MODE_INPUT) | CRL(1, CNF_ANALOG|MODE_INPUT) | CRL(5, CNF_ANALOG|MODE_INPUT);
    uint32_t ctr = 0;
    // Enable clocking
    RCC->APB2ENR |= RCC_APB2ENR_ADC1EN;
    RCC->CFGR &= ~(RCC_CFGR_ADCPRE);
    RCC->CFGR |= RCC_CFGR_ADCPRE_DIV8; // ADC clock = RCC / 8
    // sampling time - 239.5 cycles for channels 0, 1, 5, 16 and 17
    ADC1->SMPR2 = ADC_SMPR2_SMP0 | ADC_SMPR2_SMP1 | ADC_SMPR2_SMP5;
    ADC1->SMPR1 = ADC_SMPR1_SMP16 | ADC_SMPR1_SMP17;
    // sequence order: 0 -> 1 -> 5 -> 16 -> 17
    ADC1->SQR3 = 0 | (1<<5) | (5<<10) | (16<<15) | (17<<20);
    ADC1->SQR1 = (NUMBER_OF_ADC_CHANNELS - 1) << 20; // amount of conversions
    ADC1->CR1 |= ADC_CR1_SCAN; // scan mode
    // DMA configuration
    RCC->AHBENR |= RCC_AHBENR_DMA1EN;
    DMA1_Channel1->CPAR = (uint32_t) (&(ADC1->DR));
    DMA1_Channel1->CMAR = (uint32_t)(ADC_array);
    DMA1_Channel1->CNDTR = NUMBER_OF_ADC_CHANNELS * 9;
    DMA1_Channel1->CCR |= DMA_CCR_MINC | DMA_CCR_MSIZE_0 | DMA_CCR_PSIZE_0
                          | DMA_CCR_CIRC | DMA_CCR_PL | DMA_CCR_EN;
    // continuous mode & DMA; enable vref & Tsens; wake up ADC
    ADC1->CR2 |= ADC_CR2_DMA | ADC_CR2_TSVREFE | ADC_CR2_CONT | ADC_CR2_ADON;
    // wait for Tstab - at least 1us
    while(++ctr < 0xff) nop();
    // calibration
    ADC1->CR2 |= ADC_CR2_RSTCAL;
    ctr = 0; while((ADC1->CR2 & ADC_CR2_RSTCAL) && ++ctr < 0xfffff);
    ADC1->CR2 |= ADC_CR2_CAL;
    ctr = 0; while((ADC1->CR2 & ADC_CR2_CAL) && ++ctr < 0xfffff);
    // turn ON ADC
    ADC1->CR2 |= ADC_CR2_ADON;
}