ADC
This library provides the functions for initializing the adc and to get the raw adc values. In case of AVR/PIC/ARM or other high end controllers the inbuilt adc is used. In case of 8051/8052 as it doesn't have an inbuilt adc, ADC0809(8-bit) adc is used.
ADC_Init
| Defination | void ADC_Init() |
| Input Arguments | none |
| Return Value | none |
| Description | This function initializes the ADC module. |
| Usage | void main()
{ ADC_Init(); } |
ADC_GetAdcValue
| Defination | uint16_t ADC_GetAdcValue(uint8_t channel) |
| Input Arguments | uint8_t(channel number). |
| Return Value | uint16_t(10 bit ADC result) |
| Description | This function does the ADC conversion for the Selected Channel and returns the converted 10bit result.
The adc value per bit depends on the resolution of the ADC. For AVR/PIC(10-bit adc) the adc value per lsb will be 5/1023=0048v |
| Usage | uint16_t adc_result;
adc_result = ADC_GetAdcValue(0); //Adc value for channel 0 |
User guide
Program to demonstrate multi(4) channel ADC, 10bit(0-1023) adc value is displayed on lcd
#include <avr\io.h> #include "lcd.h" //User defined LCD library which contains the lcd routines #include "adc.h" //User defined library which contains the adc routines
/* start the main program */
void main()
{
uint16_t adc_result0,adc_result1,adc_result2,adc_result3;
/* Initialize the lcd before displaying any thing on the lcd */ LCD_Init(8,LCD_16x2);
/* Initialize the adc before starting the conversion */ ADC_Init();
/* Display the adc channel zero-Three values continuously */
while(1)
{
/*Get the adc values of the first four channels(0-3) */ adc_result0= ADC_GetAdcValue(0); adc_result1= ADC_GetAdcValue(1); adc_result2= ADC_GetAdcValue(2); adc_result3= ADC_GetAdcValue(3);
/*Display the adc values on LCD*/
LCD_GoToLine(LCD_LineZero);
LCD_Printf("ch0:%d ch1:%d ch2:%d ch3:%d",adc_result0,adc_result1,adc_result2,adc_result3);
} }