Closes #40. Fix openocd.cfg for lpc4337, issue pertaining m0 core not halting.#41
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evolentini merged 1 commit intolabmicro:mainfrom Aug 6, 2025
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OpenOCD's reset halt resets and halts *all cores*. The m0 core in lpc4337 is held reset until deasserted by software by writing a zero in bit 24 of RESET_CTRL1, therefore it cannot halt and causes a timeout. This breaks OpenOCD's `program` command which, as part of the programming sequence, uses `reset init` that expects the m0 core to halt. Furthermore the m0 core doesn't support the vectreset method and must be reset by sysresetreq. To fix the error, lpc4337's openocd.cfg was modified in three ways: - Added an event handler to lpc4337.m0 that writes 0 to RESET_CTRL1, thus deasserting the m0 core's reset so it can be halted - Applied the vectreset reset_config only to lpc4337.m4 - Applied the sysresetreq reset_config to lpc4337.m0 The fix was tested with an edu-ciaa-nxp board
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OpenOCD's reset halt resets and halts all cores. The m0 core in lpc4337 is held reset until deasserted by software by writing a zero in bit 24 of RESET_CTRL1, therefore it cannot halt and causes a timeout.
This breaks OpenOCD's
programcommand which, as part of the programming sequence, usesreset initthat expects the m0 core to halt. Furthermore the m0 core doesn't support the vectreset method and must be reset by sysresetreq.To fix the error, lpc4337's openocd.cfg was modified in three ways:
The fix was tested with an edu-ciaa-nxp board