Usb Interfacing With Pic Microcontroller[Step by Step]

MICROCONTROLLER TUTORIAL [STEP BY STEP] Pic Microcontroller Tutorial For Beginners With Step By Step Picture.

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USB 1.0 INTERFACING WITH PIC MICROCONTROLLER [STEP BY STEP TUTORIAL] NAASIF NOMAAN 8:08 AM INTERFACING, MICROCONTROLLER, PIC, PIC18F2550, STEP BY STEP, USB, USB 1.0, WITH NO COMMENTS

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USB communication is better than serial communication , i think . Hardware interfacing is very easier than Rs 232 . In USB 1.0 communication Low Speed -1.5Mbit/second & High Speed -12Mbit/second . The upgrade version brings upgrade speed than older . USB-3.0 has higher speed , 5Gbit/second and it's called super speed .For more information you can visit this page >> Wikipedia Usb. In this tutorial i will use pic18f2550 microcontroller & it is very popular for usb .Now you can make a question , when usb gets high speed or low speed . At 6MHz clock we will get low speed and at 48MHz Clock we will get High speed . In this tutorial we will try to make higher speed connection .We are not going to use 48MHz ,because it is very noisy .We will try another technique instead of it .Microchip company provides internal PLL( Phase Locked Loop ) circuit in some of speciäc products and pic18f2550 has internal PLL Circuit .Now look at the picture :

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PLL Circuit

The PLL circuit converts 4MHz clock to 48MHz clock .So, we need 4MHz clock . We have to divide the clock in such way so that we can get result 4MHz. Look at here , If we use 20MHz divide it by 5 and we get 4 .Example : (20/5)=4 ,(12/3)=4.. .We have to deäne this in the source code. Now let's create a project in Proteus 8.

Proteus 8 Circuit : Step 1:

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How to Create Project in Proteus _1

Step 2:

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How to Create Project in Proteus 8_2

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Usb 1.0 Interfacing With PIC Microcontroller Circuit

Now let's create a project in MikroC , because we need source hex äle to load .

MikroC Code : Step 1:

Create New Project in MikroC_1

Step 2:

Create New Project in MikroC_2

Step 3:

Create New Project in MikroC_3

Step 4:

Include All Library

Step 5:

Editing MikroC project settings_1

Step 6:

Editing MikroC project Settings_2

1. As we know PLL circuit take input 4MHz clock . So we have to divide 12MHz by 3 so that we can get 4MHz clock .If we use 4MHz we have no need this part . 2 & 3 . We are using USB 1.0 and it's High Speed clock 48MHz .So we have to devide it by 2 4 . Here we are using 12MHz Crystal clock and the oscillator selection should be HS Oscillator 5 . We have to enable voltage regulator .Basically it is an internal 3.3 voltage regulator of pic18f2550.If we enable it , it is required to connect vusb pin with a 220 nf capacitor .

#Source Code : unsigned char receivedata[64] absolute 0x500;

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