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Serial Comm using AT89C51 and ADC0832
hello Everyone..
there is my code for interfacing ADC0832 and AT89C51..#includeltreg52.hgt
#includeltstdio.hgtsbit ADC_CS = P2^0;
sbit ADC_CLK = P2^1;
sbit ADC_DO = P2^2;
sbit ADC_DI = P2^3;void InitSerial(void);
void write_adc_byte(char data_byte);
char ReadADC(unsigned char channel);
void DelayMs(unsigned int count);//—————————————
// Main program
//—————————————
void main(void)
{
InitSerial(); // Initialize serial port
while(1)
{
putchar(0x0C); // clear Hyper terminal
printf(“Ch 0 : %bu\n\r”,ReadADC(0));
printf(“Ch 1 : %bu\n\r”,ReadADC(1));
DelayMs(100); // Delay about 100 mS
}
}//—————————————
// Initialize serial port
//—————————————
void InitSerial(void)
{
SCON = 0×52; // setup serial port control
TMOD = 0×20; // hardware (9600 BAUD @11.05592MHZ)
TH1 = 0xFD; // TH1
TR1 = 1; // Timer 1 on
}//—————————————
// read analog from ADC
// Single end mode(2 channel)
//—————————————
char ReadADC(unsigned char channel)
{
unsigned char i,k;
unsigned char AdcResult; // 8 bitADC_CS=0; // Active chip select
k++; // Delay about 1us
ADC_CLK=0; // make clock low first
k++;k++;
channel = channel? 0xE0 : 0xC0;
k++; // delay about 1us
//— write command 3 bit ———-
for(i=0; ilt 3;i++) {
ADC_DI = (channel amp 0×80) != 0;
channelltlt=1;
ADC_CLK=1;
k++;k++; // delay about 1us
ADC_CLK=0;
}//— read ADC result 8 bit ——–
AdcResult=0;
for(i=0;ilt8;i++) {
ADC_CLK=1;
k++; // delay about 1us
ADC_CLK=0;
k++; // delay about 1us
AdcResultltlt=1;
AdcResult=AdcResult | (ADC_DO amp 0×01);
ADC_CLK=1;
k++; // delay about 1us
ADC_CLK=0;
k++; // delay about 1us
}
ADC_CS=1;
return(AdcResult);
}//—————————————
// Delay mS function
//—————————————void DelayMs(unsigned int count) { // mSec Delay 11.0592 Mhz
unsigned int i; // Keil v7.5a
while(count) {
i = 115;
while(igt0) i–;
count–;
}}
this code shows output
ch 0 : 255
ch 1 : 255
Even when I am changing voltages at input of ch0 and ch1… why..?
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Set vref =3v for ADC0804 #include<reg51.h> #define port P3 #define adc_input P1 #define dataport P0 #define sec 100 sbit rs = port^0; sbit rw = port^1; sbit e = port^2; sbit wr= port^3; sbit rd= port^4; sbit intr= port^5; int test_final=0 ,shift=0; void delay(unsigned int msec ) { int i ,j ; for(i=0;i<msec;i++) for(j=0; j<1275; j++); } void lcd_cmd(unsigned char item) // Function to send command to LCD { dataport = item; rs= 0; rw=0; e=1; delay(1); e=0; return; } void lcd_data(unsigned char item) // Function to send data to LCD { dataport ...Hello there I am trying to display a message on the lcd of this custom designed Microcontroller kit (http://www.nskelectronics.in/files/8051_project_board.pdf) using P89V51RD2N. I have tried to burn the following program but it just doesn't work.Can someone help me with this ..where am I going wrong.??....Nothing is shown up on the LCD though its glowing... Thanks Please note the LCD used in this board is JHD162A CODE: //Please note the LCD used in this board is JHD162A #include ltREG51.Hgt sbit EN = P3^4 ; sbit RS = P3^5; //sbit RW = ; //not mentioned on the schematic void delay(); sfr P1_data = 0x90; ...