RE: the blink time of a led is different in boot mode and in icsp mode
Sorry I was on holidays ...
Do you mean the 1000ms delay is in fact 400ms ?
Here is a program I use to calibrate the delay routine :
u16 t; // time in ms
u32 start, delta;
//Serial.printf("CPU = %ld Hz\r\n", _cpu_clock_);
for (t=100; t<=5000; t=t+100)
// Test Delay ms
start = millis();
delta = millis() - start;
Serial.printf("delay(%d) = %d ms\r\n", t, delta);
It is easier to complain than it is to do, but it is better to do than it is to complain.