How to solve the problem of MSPM0G3507 chip locking

When an MSPM0G3507 microcontroller (from the Texas Instruments MSPM0 series) becomes locked, it usually means the debug or flash access is restricted—often due to:

• Enabling readout protection or debug access lock
• Misconfigured bootloader or security settings
• Firmware writing to the BOOTCFG or security registers

Here’s how to diagnose and recover/unlock the chip:

Step-by-Step Recovery Process
1. Understand the Lock Cause
The chip might be locked due to:

• Secure boot / debug lock features (DEBUG_LOCK, SECURITY_LEVEL)
• Application firmware enabling device security unintentionally
• JTAG/SWD interface being disabled in option bytes or security config

MSPM0G3507 uses an Arm Cortex-M0+ core and supports JTAG/SWD. Its security architecture follows the TI MSPM0 Secure Boot and Debug Lock Model.

2. Tools You’ll Need

• XDS110 debugger (or LaunchPad with debug out)
• Code Composer Studio (CCS) or UniFlash
• Optional: TI MSPM0 SDK

3. Mass Erase to Unlock
If the chip is locked (no debugger access), the only way to unlock it is to perform a mass erase.

WARNING:
Mass erase will delete all flash memory, including application code.

Using UniFlash (TI's Flash Tool):

1. Open UniFlash and connect your debugger.
2. Choose the correct device (MSPM0G3507).
3. Click "Settings & Utilities".
4. Under the “Erase” tab, select "Mass Erase".
5. Execute the erase command.

This will:

• Erase all flash sectors
• Remove debug lock
• Restore full debugger access

4. Prevent Future Lockups
After regaining access, update your firmware to avoid accidental re-locking:

• Avoid setting security registers unless needed.
• Carefully use the SYS_BOOTCFG and SYS_SECURITY_CTRL registers.
• In TI SDK-based projects, check the sys_config.c or linker command file for:

c __attribute__((section(".syscfg"))) const uint32_t syscfg_data[] = { ... }; 

and make sure DEBUG_LOCK is not enabled unintentionally.

• You can also configure a bootloader fallback if the security setting fails.

5. Test Firmware in Debug Mode First
Before flashing production code:

• Test with debug access enabled.
• Ensure firmware does not permanently disable debug/JTAG/SWD access.

Summary