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Student Companion | USB Communication Device Class with PIC Microco... http://www.studentcompanion.co.za/post/USB-Communication-Device-Cl...

1 trong 13 3/29/2015 11:04 AM

The CDC device class code is "0x02, this class defines

various communications over USB.

The CDC class can be used to emulate the RS232 serial port

(COM Port) and thus creating an easy solution to migrate the

application from an old RS232 to the Universal Serial Bus

(USB) interface without implementing many changes especially

to the PC software. The device will create a virtual COM.

The current MikroC Pro for PIC version 6.0.0 does not have a

built in USB CDC library in the compiler, but you can download

the USB Device Library from LIBSTOCK. This library supports

the USB HID Class, the USB CDC Class and the USB Mass

Storage Device Class.

The file you are going to download has an .mpkg extension.

You need the package manager to integrate this USB library

into the MikroElekronika compilers. You can download the

latest package manager from MikroElekronika website.

Once you have installed the package manager, Open the

desired package file (*.mpkg) and its content will be displayed

in Navigation and Information sections.

Click on File->Install option and the installation will begin.

Installer will copy your package content into destination

folders and update your definition files.

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2 trong 13 3/29/2015 11:04 AM

Figure 2: Installing a library into MikroCcompiler

New installed library will appear in Library Manager of your

compiler, and only for those chips that are compatible with

installed library.

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3 trong 13 3/29/2015 11:04 AM

Figure 3: New installed library (USB_Device_PIC) in librarymanager

Below is a quick descriptions of the USB CDC Class library

routines as described in the USB Device Library help file.

This library works when PIC microcontroller with built-in USB

are used (e.g., PIC18F4550), and port pins RC4 and RC5 are

connected to the D+ and D- pins of the USB connector

respectively.

USB buffers for sending and receiving data must be placed in

the USB RAM.

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4 trong 13 3/29/2015 11:04 AM

Microcontroller article.

To write a device class, certain function callbacks must be

implemented in order to be used with library.

These functions must be in the user code:

USBDev_GetDescriptorHandler: Called when host requests

descriptor.

USBDev_EventHandler: This function is called when specific

event happens, like device reset.

USBDev_SetupReqHandler: Called when there is a need to

process non-standard requests.

USBDev_DataReceivedHandler: Called when data packet is

received.

USBDev_DataSentHandler: Called when data packet is

sent.

Some other Library Routines

USBDev_Init This function initializes USB module in device mode.

This function returns no data.

Example:

USBDev_Init();

USBDev_IntHandler This is a routine for servicing usb interrupts. This function

should be called from USB interrupt routine.

Before using this function, the device should be initialized first

and the USB interrupt should be enabled.


Example:

// USB interrupt service routine

void interrupt()

{

// Call library interrupt handler routine

USBDev_IntHandler();

}

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5 trong 13 3/29/2015 11:04 AM

This function returns the current USB Device state.

Prototype: uint8_t USBDev_GetDeviceState();

Example:

// Wait until device is configured (enumeration is

successfully finished)

while(USBDev_GetDeviceState() !=

_USB_DEV_STATE_CONFIGURED) ;

For more functions, please read the USB Device Library help

file.

USB Device Library - CDCClass

USBDev_CDCInit This function initializes the USB.

Before you can use any other functions, this function should

be called first.


Example:

void USBDev_CDCInit(); // Initialize CDC Class

USBDev_CDCGetLineCoding Prototype: TUSBCDCLineCoding*

USBDev_CDCGetLineCoding();

Returns: Pointer to line coding structure.

Description: Returns pointer to line coding structure

containing data rate, stop bits, parity and data bits.

USBDev_CDCSetLineCoding Prototype: void USBDev_CDCSetLineCoding (uint32_t

dwDTERate, uint8_t bCharFormat, uint8_t bParityType,

uint8_t

bDataBits);



6 trong 13 3/29/2015 11:04 AM

parity and data bits.

Parameters:

dwDTERate: data rate in bits per

second.

bCharFormat: stop bits: 0 - 1 stop bit, 1 -

1.5 stop bits, 2 - 2 stop bits.

bParityType: parity: 0 - None, 1 - Odd, 2

- Even, 3 - Mark, 4 - Space.

bDataBits: data bits: 5, 6, 7, 8 or 16.

USBDev_CDCSendData Prototype: void USBDev_CDCSendData(uint8_t* dataBuff,

uint16_t dataLen);


Description: This function sends data to the bulk data

endpoint and requires two parameters:

dataBuff: pointer to the data (buffer to hold the

data).

dataLen: length of the data (less or equal to the

maximum packet size)

Example:

char buffer[64] absolute 0x500; // Buffer of 64 bytes

uint16_t dataReceivedSize; // length of the data

USBDev_CDCSendData(buffer, dataReceivedSize); //

Send data in buffer memory to the bulk data endpoint

USBDev_CDCSetReceiveBuffer Prototype: void USBDev_CDCSetReceiveBuffer(uint8_t*

dataBuff);


Description: This function enables reception of one data

packet on the data endpoint and it has one parameter:

dataBuff: pointer to the buffer where received

packed will be stored.

The size of this reception buffer should

be at least maximum packet size for that endpoint.



7 trong 13 3/29/2015 11:04 AM

USBDev_CDCSetReceiveBuffer(buffer); // Set

receive buffer where received data is stored

USBDev_CDCDataReceived Prototype: extern void USBDev_CDCDataReceived(uint16_t

size);


Description: This function is going to be called when the

packet is received on data endpoint and it

has one parameters: size: size of received data.

USBDev_CDCParamsChanged Prototype: extern void USBDev_CDCParamsChanged();


Description:This function is going to be called when host

issues Set Line Coding request.

Example

This project example (circuit on figure 1) shows the usage of

USB CDC device that functions as a virtual COM port.

This example will send "This is USB CDC Example by

studentcompanion.co.za" to terminal then send "Press any

key..." after this any character pressed will be echoed back to

the USART terminal.

When the device is connected to PC for the first time,

Windows will detect a new hardware. Windows will ask you to

install the device drivers. Tick on Install from a list or specific

location (Advanced) radio box. Then click Next.

Browse for the device drivers then click Next, Windows will

install the drivers for you. The project can be tested by

connecting the output of the microcontroller to a USB port of a

PC and then running the HyperTerminal terminal emulation

software or any other serial terminal software.



8 trong 13 3/29/2015 11:04 AM

Programs, Accessories, Communications and Hyper Terminal

to open a windows free Hyper Terminal.

Connect your Hyper Terminal to the correct COM Port (your

USB virtual port).

To find out which COM Port has been assigned to your virtual

Serial port, go to device manager (if you are using Windows

XP, go to My Computer, at right hand side pane, click on View

system information, click on Hardware tab then Device

Manager) and expend the Ports (COM & LPT) to see all the

COM ports on your PC.

Note: Your computer will automatically allocate a COM port

number to your virtual Com Port, it does not have to be the

same a the one illustrated here below on figure 4 (COM25)

Figure 4: Virtual COM Port (COM25) in device

manager

If your serial driver was installed correctly, you should see

Mikroe Virtual Com Port and in bracket the COM number in

the device manager as shown on figure 2 above.

Set the communications parameters to 9600 baud, 8 data

bits, 1 stop bit, and no parity bit as shown on figure 5 below.



9 trong 13 3/29/2015 11:04 AM

Figure 5: COM Port settings

Note: If you connect your device in another USB port, you will

have to re-install the drivers again.

Here is the full project code:

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#include // Buffer of 64 bytes in USB RAMchar buffer[64] absolute 0x500 ; // USB interrupt service routinevoid interrupt(){// Call library interrupt handler routine USBDev_IntHandler();} void USBDev_CDCParamsChanged(){ } extern const uint8_t _USB_CDC_BULK_EP_IN; extern const uint8_t _USB_CDC_BULK_EP_OUT; uint8_t dataReceived = 0;uint16_t dataReceivedSize; void USBDev_CDCDataReceived(uint16_t size){ dataReceived = 1; dataReceivedSize = size;} //A function to send data to Uart when calledvoid Send_Data_To_Uart(char txt[64]){ int i; for(i = 0; i < strlen(txt); i++) { buffer[i] = txt[i]; }



10 trong 13 3/29/2015 11:04 AM

Figure 6 below shows data sent to terminal on a personal

computer connected to the microcontroller via a USB port.

.

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void main(void){ ADCON1 |= 0x0F; // Configure all ports with CMCON |= 7; // Disable comparators // Initialize CDC Class USBDev_CDCInit(); // Initialize USB device module USBDev_Init(); // Enable USB device interrupt IPEN_bit = 1; USBIP_bit = 1; USBIE_bit = 1; GIEH_bit = 1; // Wait until device is configured (enumeration is s while(USBDev_GetDeviceState() != _USB_DEV_STATE_CONF ; // Set receive buffer where received data is stored USBDev_CDCSetReceiveBuffer(buffer); delay_ms(5000); //5s delay //Send an Introduction text to Uart Send_Data_To_Uart("This is USB CDC Example by student delay_ms(500); Send_Data_To_Uart("Press any key...\r\n" // Infinite loopwhile(1){if(dataReceived == 1){ dataReceived = 0; //Send back received packet USBDev_CDCSendData(buffer, dataReceivedSize); // Prepare receive buffer USBDev_CDCSetReceiveBuffer(buffer); } } }



11 trong 13 3/29/2015 11:04 AM

Figure 6: Computer Terminal

>> Read also on student companion: Creating

a Serial Port Interface with C#

You can download the full project files (MikroC source code

and Drivers) below here.

All the files are zipped, you will need to unzip them (Download

a free version of the Winzip utility to unzip files).

USB CDC Driver.zip (6.63 kb) [Downloads: 6]

USB CDC Example.zip (106.27 kb) [Downloads: 6]

Tags: USB CDC , USB , PIC Communication , MikroC ,Tutorials , RS232

Currently rated 5.0 by 1 people



12 trong 13 3/29/2015 11:04 AM

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13 trong 13 3/29/2015 11:04 AM

student companion _ usb communication device class with pic microcontroller - mikroc

Documents

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