Tarjeta Usb Desarrollo 18F2552

PIC and USB - French version/Version française - Forum: Microcontrollers and usb

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USB and PIC tutorial
- Part 1 - How to build a USB device with a PIC 18F4550 or 18F2550 - Part 2 - Application: How to build a USB thermometer

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Part 1: How to build a USB device with a PIC 18F4550 or 18F2550

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Overview
PIC 18F4550 and 18F2550 are powerful microcontrollers including a full-speed USB V2.0 compliant interface. With these MCU it's very easyfor the hobbyist to design USB devices with very few components. In this page, I will describe how to use the CDC firmware from Microchip. It permits to emulate a serial port with a PC running Windows or Linux. It's also very easy to build HID devices.

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The 18F4550 experimentation board
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The following schematic is very simple, only few components are needed. It's a self powered USB device. Pleasenote I'm using the Olimex tiny-ICSD programmer, if you want to use another PIC ICSP programmer, EMail:cadserv21@hotmail.comand change the connector you should remove D1 and D2

(You can click on the picture to get an high resolution picture) This device is compatible with the microchip USB bootloader Please note C5 is 470nF (the datasheet recommend 220nF but more is better) and should be low ESR(for example a multi-layer ceramic). Don't forget the 100nF decoupling caps. Here is a possible implementation

Click on the picture to get a 300dpi PCB You can look at the wire's colour of your USB cable: Black=GND, Red=+5V, Green=Data+, White=Data-

www.cadfamily.com EMail:cadserv21@hotmail.com The document is for study only,if The to your rights,please inform us,we will delete tortsoftware

You can download MCHPFSUSB_Setup on the Microchip website. It's a windows .exe :(. The firmware we will use is written in C (for the C18 Microchip compiler). This code is (royaltyes) free, but it's not a free software, so it's not possible to redistribute modified source code In this archive, you will find:

q q q

q q

The USB bootloader and its source code in C18 A windows utilityfor the bootloader The CDC firmware source code (serial emulation) in C18. It can be used with the USB bootloader without modification Another firmware for the HID device A windows driver for CDC (under linux CDC-ACM is natively supported)

Some tips for your prototypes: Source code is in the fw/cdc/MCHPUSB.mcw directory You should comment the following lines in usbcfg.h for a self powered usbdevice:

#define USE_SELF_POWER_SENSE_IO #define USE_USB_BUS_SENSE_IO

On my schematic, LED's are connected on port B. So you should modify io_cfg.h

#define #define #define #define

mLED_1 mLED_2 mLED_3 mLED_4

LATBbits.LATB0 LATBbits.LATB1 LATBbits.LATB2 LATBbits.LATB3

You can put your own code on user.c. For example, look at Exercise_Example() in user.c. Useful functions aregetsUSBUSART() (get data) and putrsUSBUSART() (put data other the serial port) Don't forget to check mUSBUSARTIsTxTrfReady() before to send data. They are some examples in the exercise directory. For example, the following program (to put in user.c) toggle the LED number 4 when you press the key "1" in the terminal They are some examples in the exercice directory. For example, the following program (to...