STM32H7 use various uart the code sending is change

[wjian.2]

if i normolly send is "cake 50 %" to arduino receive "cake 50 %" after 10 times arduino receive "cake 50 BBBB" then all receive all "BBBC" but the usart1 vcp is sending normally this is a way to solve it?

[Karl Yamashita]

Post your code so we can see what you're doing