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Added USB-Serial function

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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.
This commit is contained in:
Nico 2014-11-29 20:27:32 +01:00
parent 96740f6d3b
commit f4bee40834
1 changed files with 51 additions and 0 deletions
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51
examples/HoodLoader2/HoodLoader2_USB-Serial/HoodLoader2_USB-Serial.ino Normal file
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/*
Copyright (c) 2014 NicoHood
See the readme for credit to other people.
HoodLoader2 USB-Serial
Transferes from USB to HW Serial and vice versa.
It also resets the main MCU on a DTR rise.
*/
void setup() {
// set main MCU by default active
pinMode(MAIN_MCU_RESET_PIN, OUTPUT);
digitalWrite(MAIN_MCU_RESET_PIN, HIGH);
// Start USB and HW Serial
Serial.begin(115200);
Serial1.begin(115200);
}
void loop() {
// USB -> Serial
for (int i = 0; i < USB_EP_SIZE; i++) {
// read maximum one EP_SIZE to not block
if (Serial.available())
Serial1.write(Serial.read());
else break;
}
// Serial -> USB
if (Serial1.available()) {
Serial.flush();
// send maximum one EP_SIZE to give the usb some time to flush the buffer
uint8_t buff[USB_EP_SIZE-1];
int i = 0;
for (i = 0; i < USB_EP_SIZE-1; i++) {
if (Serial1.available())
buff[i] = Serial1.read();
else break;
}
Serial.write(buff, i);
}
// reset the main mcu if DTR goes HIGH
static bool lastDTR = 0;
bool newDTR = (Serial.lineState()&CDC_CONTROL_LINE_OUT_DTR) ? 1 : 0;
if (lastDTR ^ newDTR)
digitalWrite(MAIN_MCU_RESET_PIN, lastDTR);
lastDTR = newDTR;
}