S3C2440 AD Converter-EEWORLD

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The 10-bit CMOS ADC (Analog/Digital Converter) is an 8-channel analog input recirculation type device. It converts the analog input signal into a 10-bit binary

The A/D converter supports on-chip sample-and-hold functions and power-down
mode operation.

The touch screen will be in the next article. ADC conversion is relatively simple. Here is a code

[cpp] view plain copy

#include "2440addr.h"
#include "2440lib.h"
#include "def.h"
//================================================ =====================
// Name: ADC_Select(int ch, U32 preScaler)
//Function: Select the conversion channel and set the converter pre-scaling value
//Parameters: ch: conversion channel preScaler: pre-scaling value
//Return value: None
//================================================ =======================
void ADC_Select(int ch, U32 preScaler)
{
rADCCON=(1<<14)|(preScaler<<6)|(ch<<3);
}
//================================================ =======================
// Name: AD_ENABLE()
//Function: Start AD conversion by setting enable
//Parameters: None
//Return value: converted value
//================================================ =======================
int AD_ENABLE(void)
{
int i;
int val=0;
for(i=0;i<16;i++)
{
rADCCON |= 0x1; // Enable ADC conversion
while(rADCCON & 0x1); // Check if ADC conversion is enabled and cleared
while(!(rADCCON &0x8000)); //Wait for the conversion to end
val +=(rADCDAT0 & 0x3ff); //Read the value converted by ADC
}
val = val/16; //Calculate ADC conversion value
return val;
}
//================================================ =======================
// Name: AD_READ()
//Function: Start AD conversion by reading controller
//Parameters: None
//Return value: converted value
//================================================ =======================
int AD_READ(void)
{
int i;
int temp,val=0;
rADCCON |= 0x2; //ADC conversion is started by reading operation
temp = rADCDAT0 & 0x3ff; //Start ADC
for(i=0;i<16;i++)
{
rADCCON |= 0x1; // Enable ADC conversion
while(rADCCON & 0x1); // Check if ADC conversion is enabled and cleared
while(!(rADCCON &0x8000)); //Wait for the conversion to end
val +=(rADCDAT0 & 0x3ff); //Read the value converted by ADC
}
val = val>>4; //Calculate ADC conversion value
return val;
}
void Main(void)
{
int temp_val;
U8 mode;
SelectFclk(2); //Set the system clock to 400M
ChangeClockDivider(2, 1); //Set the frequency division to 1:4:8
CalcBusClk(); //Calculate bus frequency
rGPHCON &=~((3<<4)|(3<<6));
rGPHCON |=(2<<4)|(2<<6); //GPH2--TXD[0];GPH3--RXD[0]
rGPHUP=0x00; //Enable pull-up function
Uart_Init(0,115200);
Uart_Select(0);
while(1)
{
ADC_Select(2, 49);
Uart_Printf("Select ADC Mode: 1.Enable 2.Read\n");
mode=Uart_Getch();
Uart_Printf("\n%c\n\n", mode);
if (mode != '1' && mode != '2')
{
Uart_Printf("you select wrong model!\n");
return;
}
switch(mode)
{
case '1':
Uart_Printf("ADC Enable-Convert Mode\n");
temp_val=AD_ENABLE();
break;
case '2':
Uart_Printf("ADC Read-Convert Mode\n");
temp_val=AD_READ();
break;
}
Uart_Printf("ADC val = %d\n", temp_val); //Send to the serial port for display
}
}

Keywords：S3C2440 Reference address：S3C2440 AD Converter

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