求助：在mqx操作系统下，k64如何实现利用RTS控制(已解决)

翱翔太空-423505 · 发表于 2014-10-16 17:04:10

本帖最后由 FSL_TICS_ZP 于 2014-11-27 14:04 编辑

你好：
下面是我的测试程序，大家帮看看有何问题？
本串口通过RS485转RS232转换器接到电脑的串口，测试版发送的数据电脑接收不到，测试版能够接收到电脑的发送数据。难道我还得通过程序控制RTS。

void mian_task
(
   uint32_t initial_data
)
{
MQX_FILE_PTR rs485_dev = NULL;
char  data_buffer[] = "RS485 send example";
bool disable_rx = TRUE;
uint32_t result;
   rs485_dev = fopen( RS485_CHANNEL, (char const *)IO_SERIAL_HW_485_FLOW_CONTROL );

if( rs485_dev == NULL )
{
   /* device could not be opened */
   _task_block();
}

/* half duplex, two wire. use only if disable receiver in transmit is desired */
result = ioctl( rs485_dev, IO_IOCTL_SERIAL_DISABLE_RX, &disable_rx );
if( result == IO_ERROR_INVALID_IOCTL_CMD )
{
   /* ioctl not supported, use newer MQX version */
   _task_block();
}

/* write data */
write( rs485_dev, data_buffer, strlen(data_buffer) );

/* empty queue - not needed for polled mode */
fflush( rs485_dev );

/* wait for transfer complete flag */
result = ioctl( rs485_dev, IO_IOCTL_SERIAL_WAIT_FOR_TC, NULL );
if( result == IO_ERROR_INVALID_IOCTL_CMD )
{
   /* ioctl not supported, use newer MQX version */
   _task_block();
}

/* half duplex, two wire */
/* if receiver was disabled before, enable receiver again */
disable_rx = FALSE;
ioctl( rs485_dev, IO_IOCTL_SERIAL_DISABLE_RX, &disable_rx ) ;
while(1)
{
      i=  fread(data_buffer, 1, 10,rs485_dev);
      if(i !=0)
      {
         for(j =0; j<i;j++)
         {

            buffer[readlen+j] = data_buffer[j];

         }
         readlen += i;
      }
      if(readlen ==10)
      {
         break;
      }
}

_task_block();
}

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