889623a83b
Now the buffer can even shrink down to 2 bytes. Not sure why 1 bytes gives problems. Also a buffer with USB_EP_SIZE is now also possible.
61 lines
1.4 KiB
C++
61 lines
1.4 KiB
C++
/*
|
|
Copyright (c) 2014 NicoHood
|
|
See the readme for credit to other people.
|
|
|
|
USB-Serial
|
|
|
|
Transferes from USB to HW Serial and vice versa.
|
|
It also resets the main MCU on a DTR rise.
|
|
*/
|
|
|
|
// define the reset pin to reset the destination MCU.
|
|
// this definition is made for HoodLoader2 (pin 20)
|
|
// but you still can use it with any other USB MCU or pin
|
|
const int resetPin = MAIN_MCU_RESET_PIN;
|
|
|
|
void setup() {
|
|
// set main MCU by default active
|
|
pinMode(resetPin, OUTPUT);
|
|
digitalWrite(resetPin, HIGH);
|
|
|
|
// Start USB Serial
|
|
Serial.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()) {
|
|
// 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 < sizeof(buff); i++) {
|
|
if (Serial1.available())
|
|
buff[i] = Serial1.read();
|
|
else break;
|
|
}
|
|
Serial.write(buff, i);
|
|
}
|
|
}
|
|
|
|
void CDC_LineEncodingEvent(void)
|
|
{
|
|
// start HW Serial with new baud rate
|
|
Serial1.end();
|
|
Serial1.begin(Serial.baud());
|
|
}
|
|
|
|
void CDC_LineStateEvent(void) {
|
|
// reset the main mcu if DTR goes HIGH
|
|
if (Serial.dtr())
|
|
digitalWrite(resetPin, LOW);
|
|
else
|
|
digitalWrite(resetPin, HIGH);
|
|
}
|