Zet6 sends short messages

USART_IT_RXNE？ This is a receive interrupt.

USART_IT_TXE？ This is the interrupt that happened.

Static electricity Charles? DTs[5 12]； //Send buffer space

Static electricity Variable? uint 16_t？ DTCursorTop = 0；

Static electricity Variable? uint 16_t？ DTCursorEnd = 0；

Invalid? UART5_IRQHandler(void)

{?

//Receive register is not empty.

if(USART_GetITStatus(UART5，？ USART_IT_RXNE)？ ! =? Reset)

{

Charles? Data? =? UART 5->； DR； //Sorry, I don't like function calls. If interruption can save running time, then save running time.

}

//Send register is empty.

if(USART_GetITStatus(UART5，？ USART_IT_TXE？ )? ! =? Reset)

{

if(DTCursorTop？ ==? DTCursorEnd){

open _ USARTx-& gt； CR 1？ & amp=? 0xff7f// After the transmission is completed, clear the interrupt transmission flag bit.

}

Otherwise {

UART 5->； DR=？ DTs[(DTCursorTop ++) & amp； 0x 1ff]； //=? 0x03

//USART_SendData(UART5，？ 0x 03)；

//The two statements have the same function, and the latter one will generate redundant instructions, occupying more stack space.

}

}?

}

int？ sendchar(int？ ch){

while((((DTCursorTop-DTCursorEnd))& amp； 0x 1ff)？ == 1)){

//? UART 5->； CR 1？ |=? 0x80//λ ж? ; // ? νáβ

}

DTs[(DTCursorEnd ++) & amp； 0x 1ff]？ =? ch；

UART 5->； CR 1？ |=? USART _ Cr 1 _ tx eie； //Set the trigger transmission interrupt.

Return? 0;

}/*? Are you online? Serial.c？ */You used the wrong parameter. It's handwritten, not copied and pasted online.