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Found 4 results

  1. benediktsch

    Logic levels from HardwareSerial

    Hello together, I was trying to get three HardwareSerials working on the DUO Board. When I was watching at the signals with my Logic Analyzer only the second UART seems to work fine. But as you can see in the attached image it seems like the first UART (Channel 0) is also sending data, but on a Logic Level of something around 0.35Volts. So why isn't this working like the second one, but going from low to high instead of from high to low and has such a low logic level? I also tried initalizing the Serials like in the given example withe the Wishbone Slot inserted, but I guess this got outdated in v2.0. Edit: In the schematic the TX RX are: SerialRed : RX = Arduino_0 ; TX = Arduino_1 SerialGreen : RX = Arduino_2; TX = Arduino_3 SerialBlue : RX = Arduino_4; TX = Arduino_5 I also tried using other PINs than the ones above but everywhere seems to be the same issue. This is my Code: HardwareSerial SerialRed(2); HardwareSerial SerialGreen(3); HardwareSerial SerialBlue(4); void setup() { Serial.begin(115200); delay(50); SerialRed.begin(57600); delay(50); SerialGreen.begin(57600); delay(50); SerialBlue.begin(57600); } void loop() { SerialSendData(TData); delay(1000); } void SerialSendData(uint8_t TData[3072]) { SerialRed.write(startsequence); for (int i = 0; i < 1024; i++) { SerialRed.write(TData[i]); } Serial.println("Red transmit"); SerialGreen.write(startsequence); for (int i = 1024; i < 2048; i++) { SerialGreen.write(TData[i]); } Serial.println("Green transmit"); SerialBlue.write(startsequence); for (int i = 2048; i < 3072; i++) { SerialBlue.write(TData[i]); } Serial.println("Blue transmit"); SerialRed.write(setFrame); SerialGreen.write(setFrame); SerialBlue.write(setFrame); }
  2. jlcollado

    Using USB FTDI Port B

    If I want to use the FTDI Port B of the FPGA USB port as a serial to USB converter connected to a PC, I understand that I have to use signals BD0 (TXD), BD1 (RXD), BD2 (RTS) and BD3 (CTS) mapped to pins 46, 141, 140, 138 of the FPGA (for full hw handshake). Am I correct ? Is there any interference with the normal Papilio Loader programming ? Regards, José Luis.
  3. Hello It is possible to replace 93LC46B serial eeprom with 93C46B (as i checked the difference is in supply voltage range, that is 2.5-5.5 volts for 93LC46B and 4.5-5.5 volts for 93C46B)?
  4. mindrunner

    Serial port issues

    Hi! I have a weird problem with my papilio pro board. I am sending large amounts of data over the uart port to an attached computer. Sometimes, the computer reads a nullbyte (0x00), which was not sent by me. I tried ZPUino and Misoc's LM32 on the papilio side and a couple of Java serial libraries as well as pyserial on the computer's side for reading. All with the same problem. Some guys in IRC told me that this might be an hardware related issue an I need to stitch the ground plane together with a bunch of short bridges across signal traces. Is this a well known problem? I am not a hardware expert, so I might need some advice or maybe a picture from a fixed board to exactly know what I need to do. Thank you!