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Found 3 results

  1. Hi, I'm working on a project to get a C64 emulator running on the Papilio DUO. I have a working setup using uno2iec program to emulate the disk drive, but this still requires a laptop connected to the board. I found a project named sd2iec, that uses the SD card to load disk images of, but the compiled program is too big to fit on the ATMega32U4 together with a bootloader. So I need a way to program the AVR directly. I Googled for documentation on how to use the bootloader program routine to upload my software as well, but couldn't find any. Is there a way to program the AVR on the Papilio DUO without bootloader via USB using for example avrdude? Kind regards, Paul
  2. breakin

    Problem between AVR and FPGA

    Hi, I'm writing a serial SRAM-interface between AVR and the SRAM available to the FPGA. Aim is to learn VHDL/FPGA programming so I'm not taking easiest route here. But I have a problem! I now have a small program on the AVR-side that transmits ones and zeroes to the fpga at a very low rate (say one per second now during debug). I'm using the MOSI-pin for this. When switching from 0 to 1 I detect _one_ rising edge on the fpga (by tracking value from last clock and current clock and looking for a 0->1 transition). When switching from 1 to 0 I detect _multiple_ rising edges on the fpga. There should be none. My question is if the AVR outputs correct nice digital signals that are interpreted as ones and zeros on the fpga, or do I need to process them somehow? Is there something special about the MOSI pin? All my VHDL programs looks fine during simulation so now I'm looking at other external factors. My VHDL program is still under suspicion of course! Thanksful for any help I can get!
  3. breakin

    AVR to FPGA communication

    note: Solved, the problem might have been related to having the incorrect board selected. Hi, I'm trying to communicate between the AVR (hard core) processor and the fpga. I've verified that AVR works. I can do serial, blink LED 13 etc, blink LEDs on my breadboard etc. However I'm having troubles "connecting" one of the AVR-compatible pins to a FPGA-pin. Would be happy for any help I could get! I'll be happy to make a tutorial/example once I figure all of this out Details: I'm opening a pin (using pinMode) on the AVR side as an output. I'm accessing that same pin in my ISE schematics and just routing it to an output (say Arduino_40). I've tried different pins (with 0-14 as output from AVR and all the CH-wing pins as outputs). My schematics has no zpuino, all there is what you can see from ise.png plus the AVR disable/enable bit. In order to route an input directly to an output I had a to make a really simple VHDL-snippet that just routes the value. See breakin_passthrough.vhdl. The problem might be in me misunderstanding how this is supposed to work. Sidenote: I'm avoiding wishbone since it relies on zpuino and I want the SRAM all to myself in the fpga. In my sketch I do void setup() { pinMode(13, OUTPUT);} and in loop I do void loop() { digitalWrite(13, HIGH); delay(500); digitalWrite(13, LOW); delay(500); } I've chosen 13 so I can see the LED blink when it is running, but I've tried other ones as well. Thanks again! ps. See this thread http://forum.gadgetfactory.net/index.php?/topic/2415-communication-zpuinofpga/for a discussion on what I'm trying to do and why I want to avoid the zpuino for now.breakin_passthrough.vhd