f4bee40834
Its now possible to also reprogram the main MCU with the HoodLoader2 in the sketch itself. It might have some bugs/errors since the USB implementation isn't that reliable.
51 lines
1.2 KiB
C++
51 lines
1.2 KiB
C++
/*
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Copyright (c) 2014 NicoHood
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See the readme for credit to other people.
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HoodLoader2 USB-Serial
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Transferes from USB to HW Serial and vice versa.
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It also resets the main MCU on a DTR rise.
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*/
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void setup() {
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// set main MCU by default active
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pinMode(MAIN_MCU_RESET_PIN, OUTPUT);
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digitalWrite(MAIN_MCU_RESET_PIN, HIGH);
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// Start USB and HW Serial
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Serial.begin(115200);
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Serial1.begin(115200);
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}
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void loop() {
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// USB -> Serial
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for (int i = 0; i < USB_EP_SIZE; i++) {
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// read maximum one EP_SIZE to not block
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if (Serial.available())
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Serial1.write(Serial.read());
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else break;
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}
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// Serial -> USB
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if (Serial1.available()) {
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Serial.flush();
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// send maximum one EP_SIZE to give the usb some time to flush the buffer
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uint8_t buff[USB_EP_SIZE-1];
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int i = 0;
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for (i = 0; i < USB_EP_SIZE-1; i++) {
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if (Serial1.available())
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buff[i] = Serial1.read();
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else break;
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}
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Serial.write(buff, i);
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}
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// reset the main mcu if DTR goes HIGH
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static bool lastDTR = 0;
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bool newDTR = (Serial.lineState()&CDC_CONTROL_LINE_OUT_DTR) ? 1 : 0;
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if (lastDTR ^ newDTR)
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digitalWrite(MAIN_MCU_RESET_PIN, lastDTR);
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lastDTR = newDTR;
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}
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