Posted on February 15, 2012 at 18:56Hello.
Sorry my english language -- i am russian.
I am develop design with use microcontroller STM32F107.
I solve use USB connection, as USB CDC.
Find and download example of this implementation.
I learn some and i have some questions.(sorry if roughly, i don`t know how right assembler sentence).
1. How can i know, when i can repeat transfer(from mc to PC)
(i think that callback function EP1_IN_Callback() is called when data was transfered, but ...).
2. I think, that, if data is resived, callback function EP3_OUT_Callback() call. Is it true?
3. I realize some example:
i transfer one any digital from PC to COM3 (STM32 OTG_FS),
then callback function EP3_OUT_Callback() is called, where i set flag
f_Zapros = 1. Main program check this flag and flag fReady_to_Write then, if true, call function USB_SIL_Write().
That is i want start IN transfer (from mc to PC) after recive request
from PC.
But...
When i test this idea(PC transmiter - programm Terminal v.1b)
PC buzz( don`t ansver on action).
Example:
main.c
fZapros = 0;
fReady_to_Write = 1;
offset = 0;
while(1)
{
if(fZapros)
{
if(fReady_to_Write)
{
fReady_to_Write = 0;
USB_SIL_Write(EP1_IN, &USB_Tx_Buffer[0] + offset, 1);
offset += 64;
if(offset >= NumPoint)
fZapros = 0;
}
}
Flag fReady_to_Write i set in callback function EP1_IN_Callback().
offset - for transfer data whith size more than 64 bytes.
NumPoint - number bytes, which will be transfer.(for example 1024).
If can, help please.
