Difference between revisions of "ADC"
(→User guide) |
|||
| Line 49: | Line 49: | ||
<syntaxhighlight> | <syntaxhighlight> | ||
| − | + | #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 */ | /* start the main program */ | ||
| − | + | void main() | |
| − | + | { | |
| − | + | uint16_t adc_result0,adc_result1; | |
| − | + | /* Initialize the lcd before displaying any thing on the lcd */ | |
LCD_Init(8,LCD_16x2); | LCD_Init(8,LCD_16x2); | ||
| − | + | /* Initialize the adc before starting the conversion */ | |
ADC_Init(); | ADC_Init(); | ||
| − | + | ||
| − | + | LCD_DisplayString(" 2-Channel ADC "); | |
| − | + | ||
| − | + | /* Display the adc channel zero,One values continuously */ | |
| − | + | while(1) | |
{ | { | ||
/*Get the adc values of the first four channels(0-3) */ | /*Get the adc values of the first four channels(0-3) */ | ||
| − | + | adc_result0= ADC_GetAdcValue(0); | |
| − | + | adc_result1= ADC_GetAdcValue(1); | |
| − | + | ||
| − | + | ||
| − | + | /*Display the adc values on LCD*/ | |
| − | + | LCD_GoToLine(LCD_LineOne); | |
| − | + | LCD_Printf("C0:%d C1:%d ",adc_result0,adc_result1); | |
| − | + | } | |
| − | + | } | |
</syntaxhighlight> | </syntaxhighlight> | ||
Revision as of 21:05, 14 December 2014
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 "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; /* Initialize the lcd before displaying any thing on the lcd */ LCD_Init(8,LCD_16x2); /* Initialize the adc before starting the conversion */ ADC_Init(); LCD_DisplayString(" 2-Channel ADC "); /* Display the adc channel zero,One 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); /*Display the adc values on LCD*/ LCD_GoToLine(LCD_LineOne); LCD_Printf("C0:%d C1:%d ",adc_result0,adc_result1); } }