Moderators: Chuckt, Garth, bitfogav
And I think Swordfish needs an easy to use development board. I don't think Arduino is going anywhere for awhile with the amount of add-on boards on the market so this sort of thing with the Arduino footprint should be a great tool!.. I may even make the board optional for a 3.3v or 5v device and include some solder tags which would allow the user to select which Microcontroller they wanted to use?. and a button.Code: Select all
// bitfogav sf board hardware
Device = 18F4550
Clock = 48
Config
FOSC = HSPLL_HS, ' External 20MHz xtal
PLLDIV = 5,
CPUDIV = OSC1_PLL2, ' 48MHz cpu clock
USBDIV = 2, ' 48MHz usb clock
FCMEN = OFF,
IESO = OFF,
PWRT = ON,
BOR = OFF,
BORV = 2,
VREGEN = ON,
WDT = OFF,
MCLRE = ON
' include module for sf board...
Include "SFBoard.bas"
' build for bootloader operation
#option org_reset = $001000
' note: include system.bas first before any other files
' this is VERY important if you're using a bootloader (requires system.bas V1.4 or later)
' be sure to set any system.bas WDT options prior to including the file
Include "system.bas"
' init_pic() - setup IO pins...
Sub init_pic()
TRISA = %00000000 ' all outputs
TRISB = %00000000 ' all outputs
TRISC = %00110100 ' D+ and D- are inputs
TRISD = %00111100 ' leds and PB_SWITCH input
ADCON1 = %00001111 ' all digital (disable A/D on all pins)
CMCON = %00000000 ' disable comparators
CVRCON = $00 ' and turn off reference
PORTA = $00 ' PORTA outputs Low
PORTB = $00 ' PORTB outputs Low
PORTC = $00 ' PORTC outputs Low
PORTD = $00
End Sub
' main entry point
init_pic()
' main program loop...
While (true)
Toggle(D13)
DelayMS(500)
End WhileYes you load the bootloader onto the chip via the icsp (pickit2), connect up a usb to the micro usb connector and then put the board into "programme mode" by resetting the board using the on board pgm button & reset button.brad wrote:I'm just trying to get my head around the boot loader. Do you load the pic with the boot loader via a pickit2 (or similar) and then what software do you use to upload hex files to the device?
I hope that makes a bit more sense?. The best thing to do is download Swordfish USB Library v1.4.2 that Jerry has done here. It includes microchips HID App (inc C# source), and you can also find Jerry's examples for USB, And ported Swordfish bootloader within the download file..brad wrote:Any chance you could post some links to downloads?
Not that I know of?, maybe you could modify the bootloader to wait for a period of time for any USB packets. If not, the bootloader times out and runs the user code?.brad wrote:Also is there any other way of putting it in boot loader mode or do you have to press the buttons? I.e. could it detect a USB connection upon the microcontroller starting up?
That must be a BIG list by now!! haha....brad wrote:I'll add it to my ever increasing list of projects to-do!
I do the same Brad, I see something that looks great and I buy it!. then when it comes it gets put into my box of things to do!!brad wrote:In fact, I just received an order of tiny little OLED displays from buy display.com (they are so cheap!) and I also bought a couple of touch screens too. I really have no project to use them in but it's on the list of to-dos as well!
I just wanted to add a bit more info on your question above Brad, this is a quote that I have read from DD about detecting a USB connection.brad wrote:Also is there any other way of putting it in boot loader mode or do you have to press the buttons? I.e. could it detect a USB connection upon the microcontroller starting up?
So if you use the USB connection, you could detect it and run bootloader mode?, this sounds like a good idea and I might have to test this out!If you're self-powered, you should connect the +5V from the USB connector to an input pin so you can monitor when the USB cable gets plugged/unplugged from the host. I usually use a simple voltage divider (for protection), plus it pulls the pin low when you're not connected so it doesn't float.
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