f.d.roscamabbing
New member
Hi,
I have 2 nearly identical Teensy 4.1 boards. The only visual difference I have observed is that the version of the CPU is different: the bottom code for the working one is CTGA2211G, the bottom code for the faulty one is CTEW2208H.
Now the issue I am having:
I am trying to have the Teensy enumerate a serial port (over USB) in Windows 10, I use the following very simple code from https://www.pjrc.com/teensy/td_serial.html:
I hit "Upload", the program compiles and the teensy.exe programming GUI opens. I press the programming button and programming proceeds without any warnings or errors.
The resulting behaviour however is very different:
On device 1 (CPU code CTGA2211G), I now see "Hello World..." in the serial terminal (as expected).
On device 2 (CPU code CTEW2208H), I see nothing in the terminal. I do see the LED blinking intermittently though: 7 blinks, about half a second apart, then 2-3sec nothing, then the blinking repeats.
What could be going on? Is this some blinking of the bootloader, indicating something? I cannot find anythink on bootloader blink codes.
edit:
P.S. I tried swapping USB cables, that does not make any difference. I also looked at the log from the programming GUI, the output for both boards is identical.
P.S. 2: this error is not limited to serial at all, see below.
I have 2 nearly identical Teensy 4.1 boards. The only visual difference I have observed is that the version of the CPU is different: the bottom code for the working one is CTGA2211G, the bottom code for the faulty one is CTEW2208H.
Now the issue I am having:
I am trying to have the Teensy enumerate a serial port (over USB) in Windows 10, I use the following very simple code from https://www.pjrc.com/teensy/td_serial.html:
Code:
void setup() {
Serial.begin(9600); // USB is always 12 or 480 Mbit/sec
}
void loop() {
Serial.println("Hello World...");
delay(1000); // do not print too fast!
}
I hit "Upload", the program compiles and the teensy.exe programming GUI opens. I press the programming button and programming proceeds without any warnings or errors.
The resulting behaviour however is very different:
On device 1 (CPU code CTGA2211G), I now see "Hello World..." in the serial terminal (as expected).
On device 2 (CPU code CTEW2208H), I see nothing in the terminal. I do see the LED blinking intermittently though: 7 blinks, about half a second apart, then 2-3sec nothing, then the blinking repeats.
What could be going on? Is this some blinking of the bootloader, indicating something? I cannot find anythink on bootloader blink codes.
edit:
P.S. I tried swapping USB cables, that does not make any difference. I also looked at the log from the programming GUI, the output for both boards is identical.
P.S. 2: this error is not limited to serial at all, see below.
Last edited: