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#include "stm8s.h"

/* TIM2 define */
#define TIMER_REL_VAL ((uint16_t)0x007D)  /*Auto-reload value to generate a time delay of 125us, after which
                                            overflow interrupt is asserted
                                            Calculations:
                                                fcpu=16MHz, Presc=16
                                                Time Period of counter is 16/(16*10^6) = 1 µs
                                                Time duration required = 125us
                                                Therefore auto-reload counter value = 125us/1µs = 007D*/

uint16_t adc_data;
uint8_t flags;

#define ADC_DATA_READY (uint8_t)(1<<0) 

INTERRUPT_HANDLER(TIM2_UPD_OVF_IRQHandler, 13) // TIM2 interrupt routine
{
    /*This interrupt routine is executed after every 125us approx*/

    /* Interrupt generated by UIF */
    ADC1->CR1 |= ADC1_CR1_ADON;     //ADC powered up
    ADC1->CR1 |= ADC1_CR1_ADON;     //begin conversion

    while (!(ADC1->CSR & ADC1_CSR_EOC)) {}; //check for the EOC

    adc_data = ADC1->DRL;           //must read LSBs first
    adc_data |= ADC1->DRH << 8;

    ADC1->CR1 |= ~ADC1_CR1_ADON;    //ADC powered down

    TIM2->SR1 &= ~TIM2_SR1_UIF;     /* Clear UIF flag */
    
    flags |= ADC_DATA_READY;        // set ADC ready flag
}

void TIM2_init(void) // Настройка таймера 2
{
    TIM2->PSCR = 4;                             // init divider register/16
    TIM2->ARRH = (uint8_t)(TIMER_REL_VAL >> 8); // init ARR
    TIM2->ARRL = (uint8_t)(TIMER_REL_VAL);
    TIM2->CR1 |= TIM2_CR1_URS;                  // update on overflow
    TIM2->CR1 |= TIM2_CR1_ARPE;                 // enable auto-reload preload, counter will be free-running
    TIM2->IER = TIM2_IER_UIE;                   // enable update on overflow interrupt
}

void ADC_init( void ) // Настройка АЦП
{
	//AIN6 PIN3
    /* Clear the align bit */
    ADC1->CR2 &= (uint8_t)(~ADC1_CR2_ALIGN);
    /* Configure the data alignment */
    ADC1->CR2 |= (uint8_t)0x08; //Right
    /* Clear the SPSEL bits */
    ADC1->CR1 &= (uint8_t)(~ADC1_CR1_SPSEL);
    /* Select the prescaler division factor according to ADC1_PrescalerSelection values */
    ADC1->CR1 |= (uint8_t)0x60; //fcpu/12 
    /* Set the single conversion mode */
    ADC1->CR1 &= (uint8_t)(~ADC1_CR1_CONT);
    /* Clear the ADC1 channels */
    ADC1->CSR &= (uint8_t)(~ADC1_CSR_CH);
    /* Select the ADC1 channel */
    ADC1->CSR |= (uint8_t)(0x06);
    /* Disables the ADC1 Schmitt Trigger on a selected channel */
    ADC1->TDRL |= (uint8_t)((uint8_t)0x01 << (uint8_t)0x06); // Schmitt trigger disable on 6 chanel
}

void main( void )
{
    ADC_init(); 
    TIM2_init();
    flags = 0;
    asm("rim");
    while (1)
    {   
        while (!(flags & ADC_DATA_READY)) // wait to set flag adc ready
        {
            flags &= ~ADC_DATA_READY;        //clear ADC ready flag
            // далее код для записи значения АЦП в буфер
        }
    }
}