UART3不会发送数据

我正在使用UART3进行RS-485通信（我在PC和电路板之间连接了B＆amp; B RS-232到RS-485转换器）。麻烦的是UART3不会“发送”数据，除非我在通过UART3发送数据后不久放置调试断点。然后数据发送正常。如果没有断点，PC就不会收到数据。这是我发送数据的功能：


void send_485（uint8_t * ptr，uint8_t length）
{
uint8_t i = 0;
uint8_t count = _1s_counter;
GPIO_WriteHigh（GPIOE，GPIO_PIN_4）;
while（_1s_counter＆lt; count + 5）{}
而（长度 - > 0）
{
/ *等待UART3 TXE = 0 * /
while（UART3_GetFlagStatus（UART1_FLAG_TXE）== RESET）
{
}
UART3_SendData8（（PTR [I ++]））;
}
count = _1s_counter;
while（UART3_GetFlagStatus（UART1_FLAG_TXE）== RESET）
{
}
while（_1s_counter＆lt; count + 1000）{}
GPIO_WriteLow（GPIOE，GPIO_PIN_4）; //在这一行放置断点。
}

关于调试器做什么使得通信工作的任何想法？添加该断点，可以完美地接收字节。

谢谢，
万斯


＃uart3＃rs485＃stm8



以下为原文




I'm using UART3 for RS-485 communications (I have a B&B RS-232 to RS-485 converter connected between the PC and the board). The trouble is that the UART3 won't ''send'' the data unless I put a debug break-point shortly after sending data via UART3. The data then sends fine. Without the break-point, the PC doesn't receive the data. Here is my function for sending data:


void send_485(uint8_t *ptr, uint8_t length)
{
  uint8_t i = 0;
uint8_t count = _1s_counter;
  GPIO_WriteHigh(GPIOE, GPIO_PIN_4);
while(_1s_counter < count+5){}
  while (length-- > 0)
  {
    /* Wait while UART3 TXE = 0 */
    while (UART3_GetFlagStatus(UART1_FLAG_TXE) == RESET)
    {
    }
    UART3_SendData8((ptr[i++]));
  }
count = _1s_counter;
    while (UART3_GetFlagStatus(UART1_FLAG_TXE) == RESET)
    {
    }
while(_1s_counter < count + 1000){}
  GPIO_WriteLow(GPIOE, GPIO_PIN_4); // Put break-point on this line.
}  

Any ideas as to what the debugger does that makes the communication work? Adding that break-point, the bytes are received flawlessly.

Thanks,
Vance

  
#uart3 #rs485 #stm8