I use Keil and V6 complier as project eaxmple in link, there is local var s in main() if set s=120 take more time USART2 Tx (PA2) can't send anything but set s=2,or comment this take time line it's work�?？ when not work condition PA2 always low ,but we know when normal PA2 was High when Send empty bus Idle and fall low at send high . so confuzzz please Check and think a reason ...
