feat: enable debugging with OpenOCD

[kienvo]

This PR set up config for OpenOCD and GDB to work with the firmware that resolves #79. However, it still needs to be documented to explain both the hardware and software setup. I'll keep it as a draft until the document is complete.

Summary by Sourcery

This PR enables debugging with OpenOCD and GDB. It introduces a debug configuration file and updates the Makefile to include debug and program targets for OpenOCD. It also updates the pin definitions for the LED driver.

New Features:

• Adds a debug configuration file for OpenOCD.

Build:

• Updates the Makefile to include debug and program targets for OpenOCD.
• Adds a default PREFIX variable for the toolchain.
• Adds a default OPENOCD variable for the OpenOCD path.

Tests:

• Adds a .gdbinit file for GDB.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request introduces debugging capabilities using OpenOCD and GDB. It includes configuration files for OpenOCD, updates to the Makefile to integrate debugging commands, and modifications to the LED pin assignments in leddrv.c.

Sequence diagram for debugging with OpenOCD

sequenceDiagram
  participant Developer
  participant Makefile
  participant OpenOCD
  participant GDB
  Developer->>Makefile: Executes 'make debug'
  Makefile->>OpenOCD: Runs OpenOCD with debug.cfg
  OpenOCD->>OpenOCD: Initializes target
  OpenOCD->>OpenOCD: Halts target
  OpenOCD->>OpenOCD: Resets target
  Developer->>GDB: Connects to OpenOCD server
  GDB->>Target: Debugging session starts

Loading

File-Level Changes

Change	Details	Files
Introduces debugging configuration files for OpenOCD and GDB.	Added debug.cfg for OpenOCD. Added .gdbinit for GDB.	debug.cfg .gdbinit
Updates the Makefile to enable debugging and integrate OpenOCD.	Introduced DEBUG variable to control debug builds. Added OPENOCD variable to specify the OpenOCD path. Added debug target to run OpenOCD with the debug configuration. Modified the program target to use the OPENOCD variable. Set a default value for the PREFIX variable.	Makefile
Updates LED pin assignments.	Changed pin assignments for LEDs J and K.	src/leddrv.c

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#79	Enable debugging of the firmware using OpenOCD.	✅
#79	Provide necessary configurations and instructions for setting up OpenOCD for debugging.	✅

Possibly linked issues

• Document Debugging method #79: The PR addresses the issue by setting up OpenOCD for debugging, resolving the need for manual setup described in the issue.

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