Send Companion Formula with airSlate SignNow

Send companion formula

hi guys welcome to this 14th tutorial in this series of programming pic microcontroller with mplab xc8 compiler in this tutorial we gonna learn the rs-232 serial communication the rs-232 serial communication is one of the oldest communication way that I'd sent or received one bit at a time this protocol can be easily be used to communicate between a PC in various devices supporting this type of protocol like pic microcontrollers GPS and GSM modules this is a simplest way to communicate between a pic microcontroller and a PC the main applications way a user is required to send some parameters to the microcontroller all for the microcontroller to send some data to the PC let's say for long-term storage or for further data processing while other interfaces like Ethernet and USB all sended are serially the term serial port usually identifies hard way more or less compliant to the rs-232 standard intended interface with modem or similar communication devices these are a couple of few cables that maybe you are familiar with this is a USB cable this is an Ethernet cable and this is a rs-232 serial cable that we gonna use in this tutorial the universal a synchronous receiver transmitter controller is the key component of the serial communication between a device and a PC or between devices the assert is also a common integrated feature in most microcontrollers today which is useful for communicating serial data to your PC or to other devices or even to other microcontrollers most of these pic microcontrollers have an internal who served at specific pins of the microcontroller like this 18f 26:20 pic has got a built-in hard way you say tomahto 8-pin rc6 witches uses a transmitter and pin rc7 which is used as a receiver this peak is got only one who served module but other pic microcontrollers have more than one search module if for some reason you wanna use you the internal search module or if this pins have already been connected to other devices this feature can also be implemented using any pin of the pic microcontroller we software in most of the compilers like the mplab xc8 compiler if you are sending data between two microcontrollers it is very easy you don't need any special component between the microcontrollers the transmitter of one microcontroller should be connected to the receive of the other microcontroller the end the receiver of the other microcontroller should be connected to the transmitter on the other microcontroller but if you are communicating between a microcontroller and a PC you gonna need a voltage level converter because the microcontroller uses TTL level which is 0 and 5 volt while the PC uses the rs-232 standard protocol which is different in terms of the voltage levels the TTL of the pic microcontroller uses 0 for low and 5 for high while the rs-232 voltage level standard is +3 2 plus 15 volt for logic low and minus 3 to minus 15 for logic and so you need a device to convert this voltage levels of plus minus 15 volt to 0 and 5 volt the most commonly used device is the max - 3 - this is a simple connection of the max 3 to only 3 wires are used the transmitter the receiver and the ground wire and these two wires are connected to the microcontroller the T in is connected to TX of the microcontroller and our one out is connected to the rx of the microcontroller for serial communication all the data transmission is entered by the user to module of the pic microcontroller but we have to configure this user to module before receiving and transmitting data as we have learned in the analog to digital converter xc8 compiler provide hard to a peripheral library that we can use to configure our peripheral modules let's go to that library and see how we can configure our assault moocher this library is contained in the installation folder of your compiler if we install your compiler in the C Drive of your PC under Program Files look for microchip then xc8 I'm using version 1.3 for open the docs folder and open the mplab xc8 peripheral libraries this is the peak 18 F peripheral library help file let us search for the peak we gonna be using ctrl F peak 18 F 2620 enter click on your peak this is just a brief highlight of the peripheral of this pic microcontroller it says it can sink or source 25 mil M current at code 3 external interrupts and so on what is important in this tutorial that it got an rs-232 operating using internal oscillator block not external crystal is required to learn how to use this library click here for the peripheral library support detail for this device click this is the ADC library got the output compare the eye squad see the our squad c prom let's scroll to result this is the assert library for this 26 25 milli these are some few functions and my cross that we gonna use there is open users this is the function that is gonna be used to configure our search module there is a right to start if you are not sent a single car to the search module or to Sartre the baud rate is a transmission speed that you're gonna be using get to start put our cert and so on let us start with the first function click on open heart it says this function is gonna need to and configuration argument called config and an integer called SP p RG which specified the value to be written to the portrait generator register to determine the poetry so basically we're gonna have two parameters it says the parameters are passed two arguments or function as bit max created by performing either bitwise and operation or bitwise or our operations for these devices in the config parameter the first thing we gonna need to configure the interrupt on transmission to say the transmission interrupt to be on or to be off you could set the interrupt to be on or to be off in the users mode you could set other a synchronous mode or synchronous mode the transmission with you could use other 8-bit or nine bit and if you selected the synchronous mode you could select other it asynchronously or the synchronous master the reception mode you can set other a single reception or a continuous reception the baud rate will set either high or low then could set the address death enable bit on or off the SPP our G this is a value that is written to the portrait generator register which determined the baud rate a twitter users operate this is the formula for a synchronous mode high speed F or is a oscillator frequency divided by 16 times SPP energy plus 1 if you are using the asynchronous mode low speed this is the formula to determine the SPB energy and if you are using the synchronous mode this is the formula that you could use let's go to mplab xc8 and see how we can use this function the open assert gives set a simple example using eight maker else crystal oscillator the portrait you gonna be using high-speed a synchronous motors used with 9600 baud rate and we can I use eight data beat the formula to calculate the SPP RG we said is the oscillator frequency divided by 16 times SP b RG plus one this is basically the same if we are looking for SP b RG gonna be the oscillator frequency which is 8 mega else divided by 16 times 9600 which is gonna be our portrait minus 1 is gonna give us about 52 so this 52 is the integer value that we gonna use in the SP p RG argument open assert we gonna set our interrupts of on transmit and off on receive we can either a synchronous mode we're gonna use 8-bit the reception mode it's gonna be continuous reception the portrait is gonna be high portrait and addressed it at an apple we're gonna set it off then the second argument is gonna be our SP p RG which is gonna be 52 if you are intending to use a different boat rate then this value is gonna change accordingly let learn about some other few functions these are some few functions that we can use the business art is used to check if the hoos are transmitted abhava it's busy should always check for ending any new bite mm the cloth whose art is used to disable the user to module the data ready use art this function returns a 1 if the data is available in them cert buffer and 0 it indicates that the data is not available they get see who served it the same as read mozart this function read a byte or one character from the users buffer if you want to read a single character from the users you could do this function gets you cert or read who served the gets dessert function read a string of character from the user this function wait and read a specified number of characters so you left to specify how many character is should wait for there is no time out and the program would wait forever if the specified number of character are not received if you say get to search buffer and specify 10 then this function is gonna wait until it received ten characters put C was RT the same as write to cert this function sent a bytes or one character to the user if you want to send one character should use the right whose art they put to start it used to send a string of characters to the data memory if you wanna send a string like hello world you could use the puts who's art and the put are whose art is used to send a string of characters to the program memory all these functions and many more I defined in this library help file you can scroll through it and read more about all these functions let's go to our project again we're gonna write a simple program to control our pic microcontroller from a PC if we send a one from the PC it's gonna switch on the the red LED and if we send to is going to switch on the yellow LED and if we send a three is gonna switch on the green LED this our xc8 code is by now you know already we've created a C file named config to set our configuration bit then in our main files now main.c file we included our configuration bit and this to include the cam by default they are very important we included our cert library we set our port B as output beam because we connected our LEDs on port B it configures our register to use the internal oscillator we do not use any external oscillator we used a built-in oscillator then we create one character variable data we created another two characters to sense few messages to the PC when we start our program is gonna sent to the PC welcomed to them companion dot zero today after five hundred milliseconds on a second line it's gonna write press one for red LED to four yellow LED and faithful green LED this is the open assert as we have explained it before then after configuring our search module we're gonna send the first message which is gonna be welcome to student companion got Co dots a day before we do anything we'll have to make sure that those art is not busy then after five hundred millisecond we're gonna send another message which is gonna read press one for red LED to four yellow and three for green LED but before we do that again we leave to make sure that the user is not busy then basically after five hundred millisecond we're gonna start our infinite loop waiting for the comment from the PC any comment that we receive we gonna store it in our variable data gonna set data read use art we're gonna read anything is from news art if you will receive a one then we're gonna sit on the first led which is connected to B zero the rest of the LED should be switched off but if we received a two then we're gonna switch on the yellow LED on B 1 and the rest off and if you receive three then we're gonna switch on the green LED on P two and switch off the rest of the LEDs and the default if there is nothing and then everything should be switched off and this is all guys let us build our project build build successful let's go to our simulation basically we not gonna Cornett this section because we are not connecting to a real hard way we're gonna use the simulation the Proteus simulation that were left in this to pin open but if you are using the real hard way then this is basically how you should connect your pic microcontroller to your PC we've got our three LEDs connected to put B this is a virtual serial terminal we could get it under the virtual instrument and click on virtual terminal the transmitter of the virtual terminal should be connected on the Eric's the receive of the microcontroller then the receiver should be connected to the transmitter of the microcontroller you have to make sure that the baud rate of your microcontroller it's running on should be exactly the same portrait of your virtual terminal to do that right click the virtual terminal a deed property and set correctly your portrait will fuse 9600 the data bit is gonna be 8 the parrot is none and the stop bit is 1 the slot our program whose art dot X ok let us run the Ted welcome to them Companion to children's a day and on the second line it says press 1 for it led to four yellow LED and three for green LED ok I'm gonna use Microsoft virtual keypad so that I can enter the value to send to the microcontroller it is the virtual keyboard if I press one I'm gonna see the red LED you switch on supplies to the yellow is on if I press 3 then the green LED is on thank you guys for watching this tutorial don't forget subscribe to this YouTube channel and I'll see you guys in the next tutorial thank you