adc.rar_Free!_adc 10 bit atmega16_adc using avr_atmega16 adc

/* Copyright (c) 2006, Spruha Electronic Systems All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /* This Program is to be used with AVRTRN Microcontroller Kit from Spruha Electronic Systems Program Tests the ADC Channel e.g. Channel 1. PA0 PIN 40 of ATMega16. Connect the Shorting Link near PORTA Header. This Connects Pin 40 PA0 to the Multiturn Potentiometer. Connect PORTB to LCDPORT by 10 core Cable. This connects the LCD Display to PORTB. Connect the PC COM Port to the RS232 PORT of the Kit by the Cable provided. The include files LCD.C, UART.C, DIGITAL_DISPLAY.c are in the directory \include. The Program measures the Voltage by converting the Analog Voltage to Digital. The ADC here is 10 Bit. The ADC Count is converted to give Display in Volts. The Internal Reference of 5v is used. The Output is Displayed on the LCD. If the Digital Display ( Optional Peripheral ) is present the voltage is Displayed on the Digital Display Card. The Voltage value is also sent to PC through RS232 PORT. The Hex Count is Displayed on the Top Line and the corrosponding calculated Voltage is displayed on second line. */ #include <avr/io.h> #include <avr/signal.h> #include <avr/interrupt.h> #include "include\uart.c" #include "include\lcd.c" #include "include\digital_display.c" #define TOLERANCE 4//0//2//10 int mod(int m); void ADC_Display(unsigned char adc_pin); void dis_num(int p,char* dis); void dis_num_lcd(int p,char* lcddis); void dis_hex(int p,char* lcddis); void delay1(int ); void delay(uint32_t); int main(void) { char lcddis[7]; char dis[5]="0000"; unsigned short full=55; unsigned short old=44,lastlast=99; unsigned char adc_pin=0; int k; long int temp; union _adc_data { unsigned char dt[2]; unsigned short data; } adc_data; dis_string(dis);//Display Data 0000 on the Digital Display lcd_init();//initialize the LCD Display Unit uart_init();//Initialize the UART. Set Baud Rate uart_puts("SPRUHA ADC TEST");//Send String to RS232 Port uart_putc(13); uart_putc(10); ADMUX = (0x40 + adc_pin);//Set Channel 1 of ADC i.e. PA0 while(1) { ADCSR = 0xC0; //Control Word And SOC (using divisor of 2) loop_until_bit_is_set ( ADCSR, ADIF ); //Wait For EOC or while(ADIF==0) adc_data.dt[0] = ADCL;//full 8bit Read Lower Byte adc_data.dt[1] = ADCH; //lsb 2 Read Higher Byte full=adc_data.data & 0x03ff; if(mod(full-old)>TOLERANCE)//Two samples are compared and displayed only if the Difference is old=full; //more than TOLERANCE. Here TOLERANCE set as 4. This is to avoid Flickering on the Display else if(mod(lastlast-full)>TOLERANCE) { lastlast=full; dis_hex(full,lcddis); lcd_curpos(0); lcd_string("ADC HEX = "); lcd_curpos(10); lcd_string(lcddis);//Displays Hex Count on the 1st Line of LCD uart_puts(lcddis);//sends the Hex Count on RS232 UART temp=(long)full*500;//Count Conversion to volt value. 1023=5v temp/=1023; k=(int)temp; dis_num(k,dis); dis_num_lcd(k,lcddis); lcd_curpos2L(0); lcd_string("ADC VOLT: "); lcd_curpos2L(10); lcd_string(lcddis);//Displays Voltage on the 2nd Line of LCD uart_puts(lcddis);//sends the Voltage value on RS232 UART uart_putc(13); uart_putc(10); } } } /************************************************************************************************** * ADMUX - Multiplexer Selection Register * 7 6 5 4 3 2 1 0 * REFS1 REFS0 ADLAR MUX4 MUX3 MUX2 MUX1 MUX0 * * REFS1 REFS0 * 0 0 - AREF, Internal Vref Turned off * 0 1 - AVCC with external capacitor at AREF pin * 1 0 - Reserved * 1 1 - Internal 2.56V voltage reference with external capacitor at AREF pin * * ADLAR - Affects the presentation of the ADC conversion result 0=Right Adjusted, 1=Left Adjusted * MUX4 to MUX0 - Analog channel and Gain selection bits * Our value is 0100XXXX i.e. 0x4X ************************************************************************************************** * ADCSR - ADC Control & Status Register * 7 6 5 4 3 2 1 0 * ADEN ADSC ADATE ADIF ADIE ADSP2 ADSP1 ADSP0 * * ADEN - ADC Enable * ADSC - ADC Start Of Conversion * ADATE - ADC Auto Trigger Enable (on +ive edge) * ADIF - ADC End Of Conversion (set to High on EOC) * ADIE - ADC Interrupt Enable * ADSP2 to ADSP0 - Division Factor between XTAL and internal clock of ADC * :. our contorl word is 11000000 i.e. 0xC0 **************************************************************************************************/ void delay(uint32_t us) { while ( us ) us--; } void delay1(int num1) { int i; for(i=0;i<num1;i++) delay(28000); } /* in dis_num you send the integer and the pointer to the string i.e. dis the dis_string(dis); will then send the number to the digital display. This subroutine converts the Number into string with ASCCI value */ void dis_num(int p,char* dis) { int i,j=1000; for(i=0;i<4;i++) { dis[i]=(p/j)%10+'0'; j/=10; } dis[4]=0; dis_string(dis); } /* in dis_num_lcd you send the integer and the pointer to the string the lcd_string(lcddis); will then print the Number with decimal. In lcddis[0], lcddis[1] msb two digits in lcddis[2] '.' and lcddis[3] and lcddis[4] lsb two digits and lcddis[5]=' ' lcddis[6]=NULL are put. This subroutine converts the Number into string with decimal after two digits in ASCCI. */ void dis_num_lcd(int p,char* lcddis) { int i,j=1000; for(i=0;i<2;i++) { lcddis[i]=(p/j)%10+'0'; j/=10; } lcddis[2]='.'; for(i=3;i<5;i++) { lcddis[i]=(p/j)%10+'0'; j/=10; } lcddis[5]=' '; lcddis[6]=0; } /* in dis_hex you send the Hex Value and the pointer to the string the lcd_string(lcddis); will then print the Number. This subroutine converts the Hexadecimal Number into string with ASCCI value */ void dis_hex(int p,char* lcddis) { int i; lcddis[0]=p/256; lcddis[1]=(p/16)%16; lcddis[2]=p%16; for(i=0;i<3;i++) if(lcddis[i]<=9) lcddis[i]+='0'; else lcddis[i]+=0x37; lcddis[3]=' '; lcddis[4]=' '; lcddis[5]=' '; lcddis[6]=0; } int mod(int m) { if(m>0) return m; else return (-m); }