CDC USB receive with XMODEM

[PKraj.1]

I'm using STM32F745. I would like to use the CDC USB to receive data from Tera Term using the XMODEM protocol. I can configure CDC_Receive_FS() to receive data for blocks of 64 bytes or less.  The procedure for this is well documented. XMODEM packets are 133 bytes. I can only reliably receive the first 64 bytes. It won't communicate at all if CDC_DATA_FS_MAX_PACKET_SIZE is increased beyond 64. How can I facilitate this?

[Pavel A.]

CDC_DATA_FS_MAX_PACKET_SIZE is a constant, 64. It cannot be increased. Instead receive several packets.

[PKraj.1]

The problem is that the subsequent packets are the same as the first. They never update.

[Pavel A.]

If you type characters in teraterm, do you receive them correctly on stm32 side?

[PKraj.1]

Yes, for the first 64 bytes.