Posted on September 25, 2013 at 20:09Hi all,
Currently I'm working on an application that will call CDC_Send_DATA() periodically. However, if I call it too often, some packets will be missing somewhere in the middle. Does anyone know the reason? Thanks a lot!
Say, in the following example, it doesn't print out ABCDEFGHI when key is pressed, but only ''DI'', ''EI'', ''FI''... etc.
int main(void)
{
Set_System();
Set_USBClock();
USB_Interrupts_Config();
USB_Init();
while (1)
{
if (bDeviceState == CONFIGURED)
{
CDC_Receive_DATA();
/*Check to see if we have data yet */
if (Receive_length != 0)
{
if (packet_sent == 1)
{
CDC_Send_DATA ((unsigned char*)''A'',1);
CDC_Send_DATA ((unsigned char*)''B'',1);
CDC_Send_DATA ((unsigned char*)''C'',1);
CDC_Send_DATA ((unsigned char*)''D'',1);
CDC_Send_DATA ((unsigned char*)''E'',1);
CDC_Send_DATA ((unsigned char*)''F'',1);
CDC_Send_DATA ((unsigned char*)''G'',1);
CDC_Send_DATA ((unsigned char*)''H'',1);
CDC_Send_DATA ((unsigned char*)''I'',1);
}
Receive_length = 0;
}
}
}
}
