4 replies to this topic

[Coskun]

Hi all, Have been playing with 4D's uLCD 32PT (SGC). Everything is fine as long as I work with Baud Rate 9600. My commands work, I can work with the LCD. However, if I want to change the Baud rate (I have to start it with 9600 and then change it later on), I cannot seem to pass above 56000 (56000 itself works). If I set the BR to anything higher than 56000, Netduino Plus and the LCD cannot communicate. The screen is supposed to support up to 256000. What might I be doing wrong? Is it a limitation with the NDP? Port used: COM2 (D2, D3). Thank you in advance. BR.

[Coskun]

I guess I figured it out by myself. I just had to suspend the thread for 10ms after sending the change baud rate command and before closing the existing connection at 9600. I can go up to 115200 now. Can someone confirm if that is the maximum I can get with a Netduino Plus? BR.

[Ralim]

Not certain if it is the maximum for the netduino, but it is as high as i would go expecting the connection to stay stable. 115200 tends to be the maximum for most devices, so i would say its safe to assume that it is the highest netduino..

[Coskun]

Thank you, Ralim. I understand.

[Paul Newton]

Hi Coskun, I don't know the maximum for the Netduino, but on a previous project I learnt that the ARM uarts generate their baud rates from the main oscillator using a divider. In our case, this meant that we could only generate up to 57600 within tolerance. But, we could go a lot higher with non-standard rates, e.g. 128000 or 256000 were possible as they could be acheived using a "2 to the power of n" divider ratio. So you might find that higher rates do work. Paul