yangsong8-a1 opened a new pull request, #3387:
URL: https://github.com/apache/nuttx-apps/pull/3387
## Summary
This PR includes two improvements to the ymodem sbrb.py tool:
1. **Fix serial reliability issues**: Add flush and reset input buffer
operations when sending commands to ensure reliable ymodem transfer initiation
over serial connections.
2. **Add bootloader burn support**: When a device automatically enters
ymodem rb mode at startup, the PC tool no longer needs to send the rb command.
Instead, it waits for a specified number of consecutive 'C' characters before
continuing with the ymodem protocol.
## Impact
- **Stability**: Improves reliability of ymodem transfers by properly
clearing serial buffers
- **Compatibility**: Adds new `-c` and `-w` options for bootloader burn
scenarios without breaking existing functionality
- **Code Quality**: Clean implementation following existing code patterns
## Testing
**Build Host:** Ubuntu 22.04 x86_64
**Target:** tc4dx evb
### Test Steps:
Functional test on real hardware (bootloader burn scenario):
- Device enters ymodem rb mode automatically at boot
- PC waits for 3 consecutive 'C' characters with 30s timeout
```
$ python3 sbrb.py -s /dev -t /dev/ttyUSB0 -b 230400 -k 16 -c 3 -w 30
vela_core0.bin
sending
name:vela_core0.bin filesize:1818624
100.0% 1818624:1818624 left:00h00m00s
time used:85.8s speed 20.7kB/s
all time:85.82s average speed:20.7kB/s
```
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