What is the exact expected sequence for the YMODEM protocol used in IAP and SBSFU?
Hello,
for some STM32 controllers ST offers for application-update the IAP and SBSFU modules:
https://www.st.com/en/embedded-software/x-cube-iap-usart.html
In both the YMODEM protocol used.
In the ST documentation the ymodem protocol is described very short in this way:
The Ymodem protocol sends data in 1024-byte blocks. Error detection is applied to data
blocks transmitted to the STR91xFA internal RAM. This is done through a comparison
between the transmitted and received data. Blocks received unsuccessfully are
acknowledged with a NAK (Negative Acknowledgement). For more details about the
Ymodem protocol, please refer to the existing literature.
What exactly does ST mean? What is the exact expected sequence?
Do you mean like described in
http://www.blunk-electronic.de/train-z/pdf/xymodem.pdf
on page 16, Figure 3
Is this the expected sequence?
Thanks and BR
EW