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/*
* Project name:
OneWire (Interfacing the DS1820 temperature sensor - all versions)
* Copyright:
(c) Mikroelektronika, 2013.
* Revision History:
20101129:
- initial release (SZ)
* Description:
This code demonstrates one-wire communication with temperature sensor
DS18x20 connected to P3.7 pin.
MCU reads temperature from the sensor and sends it on the UART.
The display format of the temperature is 'xxx.xxxx癈'. To obtain correct
results, the 18x20's temperature resolution has to be adjusted (constant
TEMP_RESOLUTION).
* Test configuration:
MCU: AT89S8252
Oscillator: External oscillator 11.0592MHz
Ext. Modules: -
SW: mikroC PRO for 8051
* NOTES:
- also, pull-up P3.7
- UART: SW11.1 and SW11.3 - ON
*/
extern void AT24C02_Write1Byte(char AT24C02_Address,char AT24C02_1Byte);
extern char AT24C02_Read1Byte(char AT24C02_Address);
extern void Display_24C02(void);
extern unsigned char ReadADC8591(unsigned char Channel);
unsigned char AT24C02Address = 0;
unsigned char LightVolt; unsigned char Volt[4];
char seconds, minutes, hours, date, month; // Global date/time variables
unsigned int year;
unsigned int RTCModuleAddress, YearOffset; // RTC chip description variables
//unsigned int i;
//#define PCF8583 // Uncomment this line if you use PCF8583 RTC chip (mE RTC extra board)
#define DS1307 // Uncomment this line if you use DS1307 RTC chip (mE RTC2 extra board)
// Software I2C connections
sbit Soft_I2C_Scl at P2_0_bit;
sbit Soft_I2C_Sda at P2_1_bit;
// End Software I2C connections
// Lcd module connections
sbit LCD_RS at P2_2_bit;
sbit LCD_EN at P2_3_bit;
sbit LCD_D4 at P2_4_bit;
sbit LCD_D5 at P2_5_bit;
sbit LCD_D6 at P2_6_bit;
sbit LCD_D7 at P2_7_bit;
// End Lcd module connections
// OneWire pinout
sbit OW_Bit at P3.B7;
// end OneWire definition
// Set TEMP_RESOLUTION to the corresponding resolution of used DS18x20 sensor:
// 18S20: 9 (default setting; can be 9,10,11,or 12)
// 18B20: 12
const unsigned short TEMP_RESOLUTION = 12;
char *text = "000.0000";
unsigned char temp1; unsigned char temp2;unsigned int temp;
const char character[] = {7,5,7,0,0,0,0,0};
void CustomChar(char pos_row, char pos_char) {
char i;
Lcd_Cmd(64);
for (i = 0; i<=7; i++) Lcd_Chr_CP(character[i]);
Lcd_Cmd(_LCD_RETURN_HOME);
Lcd_Chr(pos_row, pos_char, 0);
}
void Display_Temperature(unsigned int temp2write) {
const unsigned short RES_SHIFT =TEMP_RESOLUTION - 8 ;
char temp_whole;
unsigned int temp_fraction;
// check if temperature is negative
if (temp2write > 0x0900) {
text[0] = '-';
temp2write = ~temp2write+1;
}
else
{text[0] = ' ';}
// extract temp_whole
temp_whole = temp2write >> RES_SHIFT ;
// convert temp_whole to characters
if (temp_whole/100)
{text[0] = '1';}
//else
//{text[0] = '0';}
text[1] = (temp_whole/10)%10 + 48; // Extract tens digit
text[2] = temp_whole%10 + 48; // Extract ones digit
// extract temp_fraction and convert it to unsigned int
temp_fraction = temp2write << (4-RES_SHIFT);
temp_fraction &= 0x000F;
temp_fraction *= 625;
// convert temp_fraction to characters
text[4] = temp_fraction/1000 + 48; // Extract thousands digit
text[5] = (temp_fraction/100)%10 + 48; // Extract hundreds digit
text[6] = (temp_fraction/10)%10 + 48; // Extract tens digit
text[7] = temp_fraction%10 + 48; // Extract ones digit
// send temperature to UART
UART1_Write_Text("Temp: ");
UART1_Write_Text(text);
UART1_Write('"'); // degree sign
UART1_Write('C'); // celsius
UART1_Write(13); // CR
UART1_Write(10); // LF
Lcd_Out(1, 6, text);
if (seconds==0)
{
AT24C02_Write1Byte(minutes,temp_whole);
}
}
//------------------ Performs project-wide init
void Init_Main() {
#ifdef PCF8583
RTCModuleAddress = 0xA0;
YearOffset = 2008;
#endif
#ifdef DS1307
RTCModuleAddress = 0xD0;
YearOffset = 2000;
#endif
Soft_I2C_Init(); // Initialize Soft I2C communication
Lcd_Init(); // Initialize LCD
Lcd_Cmd(_LCD_CLEAR); // Clear LCD display
Lcd_Cmd(_LCD_CURSOR_OFF); // Turn cursor off
//LCD_Out(1,1,"Date:"); // Prepare and output static text on LCD
//Lcd_Chr(1,8,':');
//Lcd_Chr(1,11,':');
LCD_Out(2,1,"Time:");
Lcd_Chr(2,8,':');
Lcd_Chr(2,11,':');
}
//--------------------- Reads time and date information from PCF8583 RTC
void Read_Time_PCF8583() {
char byte_read;
Soft_I2C_Start(); // Issue start signal
Soft_I2C_Write(RTCModuleAddress); // RTC module address + write (R#/W = 0)
Soft_I2C_Write(2); // Start from seconds byte
Soft_I2C_Start(); // Issue repeated start signal
Soft_I2C_Write(RTCModuleAddress+1); // RTC module address + read (R#/W = 1)
byte_read = Soft_I2C_Read(1); // Read seconds byte
seconds = ((byte_read & 0xF0) >> 4)*10 + (byte_read & 0x0F); // Transform seconds
byte_read = Soft_I2C_Read(1); // Read minutes byte
minutes = ((byte_read & 0xF0) >> 4)*10 + (byte_read & 0x0F); // Transform minutes
byte_read = Soft_I2C_Read(1); // Read hours byte
hours = ((byte_read & 0xF0) >> 4)*10 + (byte_read & 0x0F); // Transform hours
if ( (byte_read.B7) && (byte_read.B6) ) // 12h format && PM flag
hours = hours + 12;
byte_read = Soft_I2C_Read(1); // Read year/date byte
year = YearOffset + ((byte_read & 0xC0) >> 6); // Transform year
date = ((byte_read & 0x30) >> 4)*10 + (byte_read & 0x0F); // Transform date
byte_read = Soft_I2C_Read(0); // Read weekday/month byte
month = ((byte_read & 0x10) >> 4)*10 + (byte_read & 0x0F); // Transform month
Soft_I2C_Stop(); // Issue stop signal
}
//--------------------- Reads time and date information from DS1307 RTC
void Read_Time_DS1307() {
char byte_read;
char i;
Soft_I2C_Start(); // Issue start signal
Soft_I2C_Write(RTCModuleAddress); // RTC module address + write (R#/W = 0)
Soft_I2C_Write(0); // Start from seconds byte
Soft_I2C_Start(); // Issue repeated start signal
Soft_I2C_Write(RTCModuleAddress+1); // RTC module address + read (R#/W = 1)
byte_read = Soft_I2C_Read(1); // Read seconds byte
seconds = ((byte_read & 0x70) >> 4)*10 + (byte_read & 0x0F); // Transform seconds
byte_read = Soft_I2C_Read(1); // Read minutes byte
minutes = ((byte_read & 0x70) >> 4)*10 + (byte_read & 0x0F); // Transform minutes
byte_read = Soft_I2C_Read(1); // Read hours byte
if (byte_read.B6) { // 12h format
hours = ((byte_read & 0x10) >> 4)*10 + (byte_read & 0x0F); // Transform hours
if (byte_read.B5) // PM flag
hours = hours + 12;
}
else
hours = ((byte_read & 0x30) >> 4)*10 + (byte_read & 0x0F); // Transform hours
byte_read = Soft_I2C_Read(1); // Read weekday byte
byte_read = Soft_I2C_Read(1); // Read date byte
date = ((byte_read & 0x30) >> 4)*10 + (byte_read & 0x0F); // Transform date
byte_read = Soft_I2C_Read(1); // Read month byte
month = ((byte_read & 0x10) >> 4)*10 + (byte_read & 0x0F); // Transform month
byte_read = Soft_I2C_Read(0); // Read year byte
year = YearOffset + ((byte_read & 0xF0) >> 4)*10 + (byte_read & 0x0F); // Transform year
//for (i =1; i<=10 ;i++)
//{byte_read=Soft_I2C_Read(1);}
Soft_I2C_Stop(); // Issue stop signal
}
//--------------------- Reads time and date information from RTC
void Read_Time() {
#ifdef PCF8583
Read_Time_PCF8583();
#endif
#ifdef DS1307
Read_Time_DS1307();
#endif
}
//-------------------- Output values to LCD
void Display_Time() {
//char year1[8];char month1[4];char date1[4];char hours1[4];char minutes1[4];char seconds1[4];
Lcd_Chr(2, 6, (hours / 10) + 48);
Lcd_Chr(2, 7, (hours % 10) + 48);
Lcd_Chr(2, 9, (minutes / 10) + 48);
Lcd_Chr(2,10, (minutes % 10) + 48);
Lcd_Chr(2,12, (seconds / 10) + 48);
Lcd_Chr(2,13, (seconds % 10) + 48);
//IntToStr(year, year1); ByteToStr(month, month1);ByteToStr(date, date1);
//ByteToStr(hours, hours1); ByteToStr(minutes, minutes1);ByteToStr(seconds, seconds1);
UART1_Write_Text("DATE:");
UART1_Write(year/1000+48); UART1_Write((year%1000)/100+48);UART1_Write((year%100)/10+48);UART1_Write(year%10+48);//print year
UART1_Write('-');
UART1_Write(month/10+48);UART1_Write(month%10+48); //Print month
UART1_Write('-');
UART1_Write(date/10+48);UART1_Write(date%10+48); //Print date
UART1_Write(' '); // CR
UART1_Write(' '); // LF
UART1_Write_Text("Time:");
UART1_Write(hours/10+48);UART1_Write(hours%10+48); //Print hour
UART1_Write(':');
UART1_Write(minutes/10+48);UART1_Write(minutes%10+48); //Print minute
UART1_Write(':');
UART1_Write(seconds/10+48);UART1_Write(seconds%10+48); //Print second
UART1_Write(13); // CR
UART1_Write(10); // LF
/*LCD_Out(1,1,"Date:"); // Prepare and output static text on LCD
Lcd_Chr(1,8,':');
Lcd_Chr(1,11,':');
Lcd_Chr(1, 6, (date / 10) + 48); // Print tens digit of date variable
Lcd_Chr(1, 7, (date % 10) + 48); // Print oness digit of date variable
Lcd_Chr(1, 9, (month / 10) + 48);
Lcd_Chr(1,10, (month % 10) + 48);
Lcd_Chr(1,12, ((year / 1000) % 10) + 48); // Print year
Lcd_Chr(1,13, ((year / 100) % 10) + 48);
Lcd_Chr(1,14, ((year / 10) % 10) + 48);
Lcd_Chr(1,15, (year % 10) + 48);
*/
}
void main() {
Init_Main(); // Perform initialization
UART1_Init(4800); // Initialize UART module at 4800 bps
//Lcd_Init(); // Initialize Lcd
//Lcd_Cmd(_LCD_CLEAR); // Clear display
//Lcd_Cmd(_LCD_CURSOR_OFF); // Cursor off
Lcd_Out(1, 1, "Temp:"); // Write message text on Lcd
//Lcd_Out(2, 1, "Time:");
CustomChar(1, 14);
Lcd_Chr(1, 15, 'C');
//Delay_ms(5);Skip first read due to not accurate
Ow_Reset(); // Onewire reset signal
Ow_Write(0xCC); // Issue command SKIP_ROM
Ow_Write(0x44); // Issue command CONVERT_T
Delay_us(120);
Ow_Reset();
Ow_Write(0xCC); // Issue command SKIP_ROM
Ow_Write(0xBE); // Issue command READ_SCRATCHPAD
Delay_ms(1000);
//Delay_ms(100); // Wait for UART module to stabilize
UART1_Write_Text("Start");
UART1_Write(13); // CR
UART1_Write(10); // LF
//--- main loop
do {
//--- perform temperature reading
Ow_Reset(); // Onewire reset signal
Ow_Write(0xCC); // Issue command SKIP_ROM
Ow_Write(0x44); // Issue command CONVERT_T
Delay_us(120);
Ow_Reset();
Ow_Write(0xCC); // Issue command SKIP_ROM
Ow_Write(0xBE); // Issue command READ_SCRATCHPAD
Read_Time(); // Read time from RTC
Display_Time(); // Prepare and display on LCD
Delay_ms(400);
temp1 = Ow_Read();
temp2 = Ow_Read();
temp = (temp2 << 8) + temp1;
//--- Format and display result on Lcd
Display_Temperature(temp);
LightVolt = ReadADC8591(0);
UART1_Write_Text("The volt on LDR is ");
ByteToStr(LightVolt, volt);UART1_Write_Text(volt);//UART1_Write_Text("/255)*5V");
UART1_Write(13); // CR
UART1_Write(10); // LF
if (seconds==30)
{AT24C02_Write1Byte(minutes+128,LightVolt); }
if(seconds==0)
{Display_24C02();}
Delay_ms(450);
UART1_Write(13); // CR
UART1_Write(10); // LF
} while (1);
}

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