ADC Application of STM8S

//Author: Nicole

//Function: AD single conversion program, suitable for temperature collection and voltage collection
//Date: 2010.11.05

#include "iostm8s105c6.h"
unsigned int DATA;
unsigned int DATAH;
unsigned int DATAL;
// Function: delay function
// Input parameter: ms -- the number of milliseconds to delay, assuming the CPU frequency is 2MHZ
void DelayMS(unsigned int ms)
{
  unsigned char i;
  while(ms != 0)
  {
    for(i=0;i<250;i++)
    {
    }
    for(i=0;i<75;i++)
    {
    }
    ms--; 
  }     
}
// Clock configuration default
void CLK_Init(void)
{
}

// Set PD0 to push-pull output to push the LED
void GPIO_Init(void)
{
  PD_DDR = 0x01;
  PD_CR1 = 0x01;              
  PD_CR2 = 0x00;
}

// Initialize A/D module
void ADC_Init(void)
{
  ADC_CR2 = 0x00;              // A/D result data is left-aligned
  ADC_CR1 = 0x00;              // ADC clock = main clock/2=1MHZ                       
                              // ADC conversion mode = single
                              // Disable ADC conversion
  ADC_CSR = 0x00;              // Select channel 0
  ADC_TDRL = 0x01;             // Disable Schmitt trigger 
}
main()
{
  int i;
  GPIO_Init();
  ADC_Init();
  while(1)                     // Enter infinite loop                             

  {

    ADC_CR1 = 0x01;            // Set the lowest bit of the CR1 register to 1, enabling ADC conversion
    for(i=0;i<100;i++);        // Delay for a period of time, at least 7uS, to ensure that the ADC module is powered on
    ADC_CR1 = ADC_CR1 | 0x01; // Set the lowest bit of the CR1 register to 1 again
                              // Enable ADC conversion
    while((ADC_CSR & 0x80) == 0); // Wait for ADC to end      

    DATAH = ADC_DRH;               // Read the high 8 bits of the ADC result
   
    DATAL = ADC_DRL;
   
    DATA = (DATAH<<2) + DATAL; // Get data with ten-bit precision
   
    //PD_ODR = 0x01;    // PD0 turns off
   
    DelayMS(DATA);    // Delay for a while
   
    PD_ODR = PD_ODR ^ 0x01;
   
   // DelayMS(DATA); 
   
  }

}