The PIC18F4550 has a USB2 interface, it's brilliant!! I can use it behave like a Mouse or use the USB interface as virtual serial port. There are other devices in the USB family as well.
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The PIC18F4550 has a USB2 interface, it's brilliant!! I can use it behave like a Mouse or use the USB interface as virtual serial port. There are other devices in the USB family as well.
Last edited by OXIMBIT; - 13th March 2005 at 18:23.
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Do you have any example of code, that this pic is show as a virtual com in windows?
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Heres some code, It should all convert to Pbpro really easly
Code:' ' General purpose USB CDC test program. ' ' Transmits data from several different buffers. ' And displays the contents of the USBIN buffer on the LCD ' ' Uses transmit and receive detection using the CARRY flag (STATUS.0) ' ' Communicate via the serial terminal set to the com port that the USB connects too. ' OPTIMISER_LEVEL = 2 ' Enable the optimiser at level 2 Device = 18F4550 ' Choose a device with on-board full speed USB XTAL = 48 ' Set the oscillator speed to 48MHz (using a 20MHz crystal) REMINDERS = OFF ' Disable all reminders LCD_DTPIN = PORTD.4 ' LCD data port attached to PORTD LCD_RSPIN = PORTE.0 ' LCD RS pin attached to PORTE.0 LCD_ENPIN = PORTE.1 ' LCD EN pin attached to PORTE.1 LCD_INTERFACE = 4 ' 4-bit Interface LCD_LINES = 2 ' 2 line LCD LCD_TYPE = ALPHANUMERIC ' Use an Hitachi alphanumeric LCD USB_DESCRIPTOR = "CDCDESC.INC" ' Point to the CDC DESCRIPTOR file (located in the INC\USB_18 folder) Dim PP0 As Byte SYSTEM ' USBPOLL status return Dim VAR1 As Word ' General purpose variable Dim ARRAY1[20] As Byte ' Used to hold some output characters Dim OUT_BUFFER As String * 20 ' Used to hold some output characters Dim IN_BUFFER As String * 20 ' Used to hold some input characters Symbol CARRY_FLAG = STATUS.0 ' High if microcontroller does not have control over the DP buffer Symbol TRNIF = UIR.3 ' Low if USB Busy '------------------------------------------------------------------------ ' The main program loop starts here DelayMS 200 ' Wait for things to stabilise ALL_DIGITAL = True ' Set PORTA and PORTD to digital mode Clear ' Clear all RAM before we start Cls ' Clear the LCD Repeat ' \ USBPoll ' Wait for the USB interface to become attached Until PP0 = %00000110 ' / StrN ARRAY1 = " ARRAY BUFFER\n\r" ' Fill the array with NULL terminated characters OUT_BUFFER = " STRING BUFFER\n\r" ' Fill the string with NULL terminated characters VAR1 = 0 ' Reset the counting variable While 1 = 1 ' Create an infinite loop Repeat ' Wait for USB input USBIn 3, IN_BUFFER, Auto ' Poll the USB and Receive some data from endpoint 3 Until CARRY_FLAG = 0 ' Keep looking until data is able to be received Print At 1,1,"USB BUFFER" Print At 2,1,IN_BUFFER ' Display the contents of the USB buffer on line 2 of the LCD Clear IN_BUFFER ' Then clear the buffer for the next time __USBOUT_BUFFER = " USB BUFFER\n\r" ' Place characters directly into the USB TX buffer string ' ' Transmit from the USB's internal TX buffer String. NULL terminated. Repeat USBOut 3, __USBOUT_BUFFER, Auto ' Poll the USB and Transmit the buffer from endpoint 3 Until CARRY_FLAG = 0 ' Keep trying if the microcontroller does not have control over the buffer Repeat : Until TRNIF = 1 ' Wait for completion before transmitting anything else ' Transmit from a NULL terminated array Repeat USBOut 3, ARRAY1, Auto ' Poll the USB and Transmit the buffer from endpoint 3 Until CARRY_FLAG = 0 ' Keep trying if the microcontroller does not have control over the buffer Repeat : Until TRNIF = 1 ' Wait for completion before transmitting anything else ' Transmit from a NULL terminated String Repeat USBOut 3, OUT_BUFFER, Auto ' Poll the USB and Transmit the buffer from endpoint 3 Until CARRY_FLAG = 0 ' Keep trying if the microcontroller does not have control over the buffer Repeat : Until TRNIF = 1 ' Wait for completion before transmitting anything else ' Transmit from a NULL terminated code memory String Repeat USBOut 3, TEXT_STRING, Auto ' Poll the USB and Transmit the buffer from endpoint 3 Until CARRY_FLAG = 0 ' Keep trying if the microcontroller does not have control over the buffer Repeat : Until TRNIF = 1 ' Wait for completion before transmitting anything else ' Transmit a NULL terminated quoted string of characters Repeat USBOut 3, " QUOTED STRING\n\r", Auto ' Poll the USB and Transmit the buffer from endpoint 3 Until CARRY_FLAG = 0 ' Keep trying if the microcontroller does not have control over the buffer Repeat : Until TRNIF = 1 ' Wait for completion before transmitting anything else ' Transmit 12 characters from a code memory String Repeat USBOut 3, TEXT_STRING, 12 ' Poll the USB and Transmit only 12 characters of the buffer from endpoint 3 Until CARRY_FLAG = 0 ' Keep trying if the microcontroller does not have control over the buffer Repeat : Until TRNIF = 1 ' Wait for completion before transmitting anything else __USBOUT_BUFFER = "\n\rVAR1 = " + Str$(Dec,VAR1) + "\n\r" ' Convert VAR1 into a string ' Transmit from the USB's internal TX buffer String. NULL terminated. Repeat USBOut 3, __USBOUT_BUFFER, Auto ' Poll the USB and Transmit the buffer from endpoint 3 Until CARRY_FLAG = 0 ' Keep trying if the microcontroller does not have control over the buffer Repeat : Until TRNIF = 1 ' Wait for completion before transmitting anything else Inc VAR1 Wend ' Go wait for the next buffer input TEXT_STRING: CData " CODE MEMORY BUFFER\n\r",0
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oke thanx for the info i give it a try only i'm suppriced about how windows will detect this device
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