AM625: AM62XX:Questions about UART

Hi,

xiongwei said:

The serial port cannot communicate with other serial devices at the 2M baud rate, but two AM62 devices can communicate

The serial port on the other device is communicating at 2M baudrate, can you please confirm this, along with other settings like parity type, stop and start bits.

xiongwei said:

but two AM62 devices can communicate

I am assuming the connections must be:

First AM62x's TX to second AM62x's RX and vice versa. Glad to know this works.

Regards,

Vaibhav

The TX of the first AM62x to the RX of the second AM62x can communicate normally

Hi,

Can you show me the options for flow control? Are the options Software and Hardware flow control? If yes, can you try by enabling either of them and seeing if the transmission to the external UART works fine.

Apart from this, from the waveform I see there is no start bit and stop bit is there. Is this the same configuration at the receiver's UART as well?

Regards,

Vaibhav

Hi，

I set the baud rate through the command stty -F /dev/ttyS4 raw speed 2000000 cs8 -parenb -cstopb -crtscts -echo，

AM62 send 0x31，but Serial port debugging tool recive 0X71，

The binary of these two numbers is

Looks like there's something wrong with this high level recognition，two cycles, identified as three cycles

We also have a question, we found that there is an interval between two characters, can it be modified to two cycles？

Hi,

Allow sometime for another expert to comment on your question.

Regards,

Vaibhav

Hi Xiongwei,

Please check the AM62x device TRM Table 12-113 "UART Baud Rate Settings", the AM62x UART doesn't really support 2Mbps baud. The closest baud which AM62x can do is 1.846Mbps, which is about -8% error tolerance. Does the UART device you use support this?

Hi,

According to the baud rate displayed in the table, does it mean that AM62 does not support other baud rates，such as 1.5M，2M