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Found 1 result

  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 I also tried initalizing the Serials like in the given example withe the Wishbone Slot inserted, but I guess this got outdated in v2.0.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); }