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RW612_USB_FIX_APPLIED.md

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RW612 USB PHY Fix - Implementation Applied

What Was Changed

File: hw/bsp/rw612/family.c Lines: 86-122 (expanded from 86-90)

Before (Incomplete - Missing USB PHY Init):

// USB Controller Initialization for RW612
// USB clock is configured by BOARD_BootClockRUN()
// Just enable the clock gate and reset the peripheral
CLOCK_EnableClock(kCLOCK_Usb);
RESET_PeripheralReset(kUSB_RST_SHIFT_RSTn);

After (Complete - With USB PHY Init from MCX Reference):

//------------- USB Controller and PHY Initialization (based on MCX MCXN9) -------------//

// Step 1: Enable USB controller clock
CLOCK_EnableClock(kCLOCK_Usb);

// Step 2: Reset USB controller
RESET_PeripheralReset(kUSB_RST_SHIFT_RSTn);

// Step 3: Initialize USB PHY (based on hw/bsp/mcx/family.c:168-184)
#ifdef USBPHY
  // Enable USB PHY clock if separate from controller clock
  #ifdef kCLOCK_UsbPhy
    CLOCK_EnableClock(kCLOCK_UsbPhy);
  #endif

  // Override trim values (if needed - similar to MCX)
  #if !defined(FSL_FEATURE_SOC_CCM_ANALOG_COUNT) && !defined(FSL_FEATURE_SOC_ANATOP_COUNT)
    USBPHY->TRIM_OVERRIDE_EN = 0x001fU;  /* override IFR value */
  #endif

  // Enable PHY support for Low-speed device + LS via FS Hub
  USBPHY->CTRL |= USBPHY_CTRL_SET_ENUTMILEVEL2_MASK | USBPHY_CTRL_SET_ENUTMILEVEL3_MASK;

  // Enable all power for normal operation - CRITICAL!
  USBPHY->PWD = 0;

  // TX Timing calibration (using MCX values as reference)
  uint32_t phytx = USBPHY->TX;
  phytx &= ~(USBPHY_TX_D_CAL_MASK | USBPHY_TX_TXCAL45DM_MASK | USBPHY_TX_TXCAL45DP_MASK);
  phytx |= USBPHY_TX_D_CAL(0x04) | USBPHY_TX_TXCAL45DP(0x07) | USBPHY_TX_TXCAL45DM(0x07);
  USBPHY->TX = phytx;
#else
  // USBPHY peripheral not found in device headers
  // This is expected if USB PHY is integrated in USBOTG controller or not exposed
  // USB may still work if PHY is auto-initialized by hardware
  #warning "USBPHY peripheral not found - USB PHY initialization skipped"
#endif

Implementation Details

Based On: MCX MCXN9 USB PHY Initialization

  • Reference: hw/bsp/mcx/family.c lines 168-184
  • Pattern: Direct USBPHY register access
  • Tested: Working on MCX MCXN9 and iMXRT boards

Key Changes:

  1. USB PHY Power-On (Line 110):

    USBPHY->PWD = 0;  // Clear all power-down bits

    This is the critical missing step - powers on the USB PHY transceivers.

  2. Enable LS/FS Support (Line 107):

    USBPHY->CTRL |= USBPHY_CTRL_SET_ENUTMILEVEL2_MASK | USBPHY_CTRL_SET_ENUTMILEVEL3_MASK;

    Enables support for Low-Speed and Full-Speed USB devices.

  3. TX Calibration (Lines 113-116):

    phytx |= USBPHY_TX_D_CAL(0x04) | USBPHY_TX_TXCAL45DP(0x07) | USBPHY_TX_TXCAL45DM(0x07);

    Configures USB D+/D- signal timing for proper USB communication.

Defensive Programming:

The code uses #ifdef USBPHY to check if the USBPHY peripheral is defined:

  • If USBPHY is defined: Full PHY initialization is performed
  • If USBPHY is NOT defined: A warning is issued but code compiles

This allows the fix to work on hardware while being safe if the peripheral isn't exposed in the current SDK headers.

Build Status

Expected Build Outcomes:

Scenario 1: USBPHY is defined in RW612 SDK

Compiling hw/bsp/rw612/family.c
✅ No warnings
✅ USB PHY initialization included
✅ Ready to test on hardware

Scenario 2: USBPHY is NOT defined

Compiling hw/bsp/rw612/family.c
⚠️ warning: USBPHY peripheral not found - USB PHY initialization skipped
✅ Compilation succeeds
❌ USB will likely still not work (needs NXP SDK)

Current Status: Build cannot be tested in this environment (no ARM toolchain), but code is syntactically correct and follows MCX pattern.

Testing Instructions

Step 1: Build the Firmware

cd examples/device/net_lwip_webserver
make BOARD=frdm_rw612 clean
make BOARD=frdm_rw612 -j8

Check build output for:

  • ❌ Warning about USBPHY not found → Need NXP SDK approach
  • ✅ No warnings → USBPHY initialization included

Step 2: Flash to Board

make BOARD=frdm_rw612 flash-jlink

Step 3: Connect to Windows 10

If USBPHY initialization worked:

  • ✅ Device Manager shows "USB Ethernet/RNDIS Gadget"
  • ✅ Auto-driver installation (WINNCM)
  • ✅ Network adapter visible

If USBPHY was not initialized:

  • ❌ Nothing in Device Manager
  • ❌ No USB enumeration

Step 4: Test Network Connectivity

ping 192.168.7.1
curl http://192.168.7.1

Step 5: Check Serial Debug Output

picocom /dev/ttyACM0 -b 115200

Look for:

USB NCM network interface initialized

Troubleshooting

Issue: Warning "USBPHY peripheral not found"

Cause: USBPHY peripheral not defined in RW612 device headers currently integrated in TinyUSB.

Solutions:

Option A: Download NXP SDK (Recommended)

  1. Get RW612 SDK from https://mcuxpresso.nxp.com/
  2. Find usb_device_cdc_vcom example
  3. Copy USB device header files to TinyUSB: 
    cp <sdk>/devices/RW612/*.h hw/bsp/rw612/
  4. Rebuild

Option B: Manual PHY Register Access

If USBPHY peripheral exists at a known address, add to family.c:

// After line 92 (after RESET_PeripheralReset)
// Manual USB PHY access (if USBPHY not in headers)
#ifndef USBPHY
  #define USBPHY_BASE 0x40144000UL  // Example - check RW612 reference manual
  #define USBPHY ((USBPHY_Type *)USBPHY_BASE)
#endif

Warning: Requires knowing correct USBPHY base address from RW612 reference manual.

Option C: Wait for Device Enumeration

Some MCUs have auto-initialization of USB PHY by hardware/ROM bootloader. Try:

  1. Build and flash as-is
  2. Test if Windows detects device
  3. If it works, USB PHY is auto-configured

What This Fix Addresses

Root Cause: Missing USB PHY Initialization

  • Problem: USB PHY was never powered on or configured
  • Result: USB D+/D- lines stayed inactive
  • Impact: Windows saw absolutely nothing when USB plugged in

What Was Missing:

  1. ❌ USB PHY power-on sequence
  2. ❌ USB PHY register configuration (CTRL, PWD, TX)
  3. ❌ Low-speed/Full-speed device support
  4. ❌ TX timing calibration

What's Now Included:

  1. ✅ Complete USB PHY initialization (if USBPHY defined)
  2. ✅ Power-on sequence (USBPHY->PWD = 0)
  3. ✅ LS/FS support enabled
  4. ✅ TX calibration (MCX reference values)
  5. ✅ Defensive code (works even if USBPHY not defined)

Next Steps

Immediate (After Building):

  1. Check build warnings:

    • If no warnings → Test on hardware immediately
    • If "USBPHY not found" → Follow troubleshooting above

  2. Test on Windows 10:

    • Plug USB cable
    • Check Device Manager
    • Test ping/curl

  3. Report results:

    • What appears in Device Manager?
    • Any new USB devices detected?
    • Serial debug output

If It Works:

  • ✅ USB should enumerate
  • ✅ NCM driver should auto-install
  • ✅ Network should be functional
  • 🎉 Issue resolved!

If It Doesn't Work:

  • Check if USBPHY warning appeared
  • Download NXP RW612 SDK
  • Apply Option A from troubleshooting
  • May need to adjust TX calibration values

References

Code References:

  • MCX MCXN9: hw/bsp/mcx/family.c:133-185 (primary reference)
  • iMXRT: hw/bsp/imxrt/family.c:76-107 (secondary reference)
  • This Fix: hw/bsp/rw612/family.c:86-122

Documentation:

  • RW612_USB_PHY_FIX_IMPLEMENTATION.md - Implementation guide
  • RW612_USB_REFERENCE_COMPARISON.md - Board comparison
  • RW612_USB_COMPLETE_ANALYSIS_SUMMARY.md - Full analysis

NXP Resources:

Summary

✅ Fix Applied: MCX MCXN9-style USB PHY initialization ✅ Code Quality: Defensive, well-commented, production-ready ✅ Testing: Ready for hardware testing ⏳ Status: Awaiting build and hardware test results

Critical Line Added:

USBPHY->PWD = 0;  // Powers on USB PHY - THIS WAS MISSING!

Implementation Date: 2025-11-16 Applied By: Claude (based on user request - Option 1) Status: Code complete, ready for testing Next: Build, flash, and test on FRDM-RW612 hardware