SIMPLE DELAY FUNCTION FOR 8051 IN C SERIAL

SIMPLE DELAY FUNCTION FOR 8051 IN C SERIAL

SCON register is used to control the operation of the serial communication. TXD pin is used for transmitting the serial data and the RXD pin is used for the transmission of the data.

Serial Port: Inorder, to perform the serial communication, TXD and RXD pins are used.

TMOD and TCON helps in the timer operation. Similarly, we can store 16 bit data in T1 also. This is done by storing the lower 8 bit in TL0 and the upper 8 bit in TH0. In T0, it is possible to store 16 bit data. If these pins are used in the counter mode, we can count the external pulses. In 8051, there are two timer pins T0, T1.

Timers and Counters: Timer helps in providing delay between the events.

ROM as a volatile memory helps in permanent data storage.

On-chip ROM: 8051 consists of 4KB ROM for program storage.

RAM as a non-volatile memory consists of register banks, stacks for temporary data storage and some special function registers.

On-chip RAM: Random access memory of 128 byte is used for data storage in 8051.

The basic architecture of 8051 is shown below. This type of microcontroller has many applications in the field of robotics, home appliances etc. Ĩ051 microcontroller is an 8 bit microcontroller that can Read, Process and Write data of 8 bit. To know more about 8051 interfacing, Refer. 8051 microcontroller is the first basic microcontroller of the MCS-51 family and it was introduced by the Intel Corporation during the 1970s. Built in ROM, RAM, input and output ports, serial ports, interrupts, timers and clock circuits are some of its basic features. They have all the features found in microprocessors. Microcontroller is an entire computer manufactured on a single chip. Note that, you do not need if(INT0=1), the ex0_isr will be automatically called when an interrupt is generated.8051 Microcontroller, Embedded C Programming IT0 = 1 // Configure interrupt 0 for falling edge on /INT0 (P3.2) Here is a website about 8051's external interrupts.īut to give you a little example: #include This way all three peripheries can be served almost immediately. Meanwhile, the state of the switches can be checked in the main while loop. Once the falling-edge is detected on INT0 pin, the microcontroller stops and jumps to the interrupt vector table to service that interrupt, to do whatever you want to when an obstacle is detected. The second mode is excellent for the ultrasonic sensor, as it uses a falling-edge to indicate an obstacle. Level-Triggered Interrupt, generated by a low-level signalĮdge -Triggered Interrupt, generated by a falling-edge signal Hence I want to run two infinite loops parallelly and if it is not possible, is there any other solution to run both functions continuously together without one conflicting with other?įor a 8051, there must be at least two external-interrupt pins (INT0, INT1). Now once it goes out of while(1) loop for ultrasonic sensor till the time an obstacle is detected it doesn't come back to while(1) loop. I want it to also run the 2nd if statement where it checks the polarity of switches SW1 and SW2 which is to be checked continuously with the continuous scanning of ultrasonic sensor. But because of this when no obstacle is detected it will stay there forever. Now as you can see while ultrasonic sensor looks for an obstacle it waits in the while statement for falling edge at echo pin. Void delay_ms(unsigned int ms)//This function Provide delay in ms Ms. Void delay_us(unsigned int us)//This function provide delay in us uS. SP_X = 1 //Make positive of water pump motor GC_X = 1 //Make positive of Grass cutter motor Time = Count*1.085 //Calculate total time in uS.ĭist = Time/58 //As per datasheet of HC-SR04 Distance is in Centimeter If(TF0 = 1) //timer over if no obstacle is detectedĬount = TL0 + TH0*256 //Calculate number of count While(US_E = 1) //Wait for Falling edge at Echo pin While(US_E = 0) //Wait for Rising edge at Echo pin Sbit US_T= P1^1 //Trigger pin of Ultrasonic sensor Sbit US_E = P1^0 //Echo pin of Ultrasonic sensor Sbit LM2_Y = P2^7 //Negative of Left Motors Sbit LM2_X = P2^6 //Positive of Left Motors Sbit RM2_Y = P2^5 //Negative of Right Motors

Sbit RM2_X = P2^4 //Positive of Right Motors Sbit LM1_Y = P2^3 //Negative of Left Motors Sbit LM1_X = P2^2 //Positive of Left Motors Sbit RM1_Y = P2^1 //Negative of Right Motors Sbit RM1_X = P2^0 //Positive of Right Motors Sbit GC_X = P1^2 //ON grass cutting motor Here is the program a bit long but thats how complex it is - #include Is it possible to run two while(1) loops parallelly?

While ultrasonic sensor keeps scanning its stuck in a while function but at the same time I want to keep my infinite loop running for other functions. Recently while writing a program on embedded c for 8051 to run a robot using ultrasonic sensor I got into a problem.

Simple delay function for 8051 in c