mirror of
https://github.com/mikecarper/MeshCore.git
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98 lines
3.4 KiB
Python
98 lines
3.4 KiB
Python
"""Compile a build-local fix for the framework's inherited nRF52 USB READY hang.
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Never modify PlatformIO's shared framework package. Fail closed if a framework
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update changes the code this narrow backport expects. The same handler policy
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is carried by OTAFIX's mikecarper/tinyusb fork.
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"""
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from pathlib import Path
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OLD_READY = """ case USB_EVT_READY:
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// Skip if pull-up is enabled and HCLK is already running.
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// Application probably call this more than necessary.
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if (NRF_USBD->USBPULLUP && hfclk_running()) break;
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// Waiting for USBD peripheral enabled
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while (!(USBD_EVENTCAUSE_READY_Msk & NRF_USBD->EVENTCAUSE)) {}
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"""
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READY = """ case USB_EVT_READY:
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{
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// READY is a consumed event, not a persistent status bit. In particular,
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// a post-SoftDevice callback may find USB already attached but HFCLK no
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// longer requested by this context. Restore the clock before testing
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// completion; do not wait for a second peripheral READY event.
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uint32_t remaining = 100000;
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if ( !NRF_USBD->ENABLE ) break;
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hfclk_enable();
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while ( !hfclk_running() )
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{
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if ( !NRF_USBD->ENABLE || !--remaining ) return;
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}
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// Recheck attachment inside the wait: another READY handler can preempt
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// this one and consume EVENTCAUSE before it attaches. Both waits share
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// a finite poll budget, independent of ticks/interrupts being available.
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while ( !(USBD_EVENTCAUSE_READY_Msk & NRF_USBD->EVENTCAUSE) )
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{
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if ( NRF_USBD->USBPULLUP || !NRF_USBD->ENABLE || !--remaining ) return;
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}
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if ( NRF_USBD->USBPULLUP || !NRF_USBD->ENABLE ) break;
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"""
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OLD_ATTACH = """ // Wait for HFCLK
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while (!hfclk_running()) {}
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// Enable pull up
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NRF_USBD->USBPULLUP = 1;
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__ISB();
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__DSB(); // for sync
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break;
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case USB_EVT_REMOVED:"""
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ATTACH = """ // Enable pull up
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if ( NRF_USBD->ENABLE ) NRF_USBD->USBPULLUP = 1;
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__ISB();
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__DSB(); // for sync
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}
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break;
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case USB_EVT_REMOVED:"""
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def patched_source(source):
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source = source.replace("\r\n", "\n")
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if READY in source and ATTACH in source and OLD_READY not in source and OLD_ATTACH not in source:
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return source
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if source.count(OLD_READY) != 1 or source.count(OLD_ATTACH) != 1:
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raise RuntimeError(
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"nRF52 USB power fix: unrecognized TinyUSB driver; review the "
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"framework update before building (shared SDK was not modified)"
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)
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return source.replace(OLD_READY, READY).replace(OLD_ATTACH, ATTACH)
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def replace_driver(build_env, node):
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# SCons passes a not-yet-created VariantDir node, not the SDK source path.
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source = Path(node.srcnode().get_abspath())
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patched = patched_source(source.read_text(encoding="utf-8"))
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destination = Path(build_env.subst("$BUILD_DIR")) / "patched-nrf52-usb" / source.name
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destination.parent.mkdir(parents=True, exist_ok=True)
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if not destination.exists() or destination.read_text(encoding="utf-8") != patched:
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destination.write_text(patched, encoding="utf-8")
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print("nRF52 USB: build-local bounded READY/HFCLK fix enabled")
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return build_env.File(str(destination))
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def install(build_env):
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build_env.AddBuildMiddleware(
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replace_driver,
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"*Adafruit_TinyUSB_Arduino*src*portable*nordic*nrf5x*dcd_nrf5x.c",
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)
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if "Import" in globals():
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Import("env")
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install(env)
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