import os, json, time, struct, subprocess, re
from pathlib import Path
root=Path(__file__).resolve().parent
project=root.parents[1]
dll=project/'tmp/can1-test-20261002/pcan-basic/x64'
os.environ['PATH']=str(dll)+os.pathsep+os.environ['PATH']
handle=os.add_dll_directory(str(dll))
import can
cli=r'D:\STM32CubeCLT_1.19.0\STM32CubeProgrammer\bin\STM32_Programmer_CLI.exe'
results=[]
for rate in (250000,500000):
    with can.Bus(interface='pcan',channel='PCAN_USBBUS1',bitrate=rate) as bus:
        tag=rate+123
        data=struct.pack('<HHI',1,1,tag)
        errors=[]
        for i in range(20):
            try: bus.send(can.Message(arbitration_id=0x6a6,data=data,is_extended_id=False),timeout=.1)
            except Exception as exc: errors.append(str(exc)); break
            time.sleep(.1)
        status=hex(bus.status())
        r=subprocess.run([cli,'-c','port=SWD','mode=HOTPLUG','freq=1000','-r32','0x200002cc','128'],capture_output=True,timeout=15)
        (root/f'probe_{rate}_ram.log').write_bytes(r.stdout+r.stderr)
        result={'bitrate':rate,'tag':tag,'pcan_status':status,'send_errors':errors,'ram':r.stdout.decode(errors='replace')}
        results.append(result)
        print(json.dumps(result),flush=True)
(root/'link-probe.json').write_text(json.dumps(results,indent=2),encoding='utf-8')