sdk-debuger-jlink/Devices/ClouderSemi/CR600/CR600.JLinkScript

/*********************************************************************
*            (c) 1995 - 2018 SEGGER Microcontroller GmbH             *
*                        The Embedded Experts                        *
*                           www.segger.com                           *
**********************************************************************

-------------------------- END-OF-HEADER -----------------------------

File    : ClouderSemi_CR600.JLinkScript
Purpose : Contains device specific handling for ClouderSemi's CR600 series
Literature:
  [1]  J-Link User Guide

Additional information:
  For more information about public functions that can be implemented in order to customize J-Link actions, please refer to [1]
*/

/*********************************************************************
*
*       Global functions
*
**********************************************************************
*/

/*********************************************************************
*
*       ResetTarget
*/
int AfterResetTarget(void) {
  //
  // The flash of the CR600 (Cortex-M0) is located at address 0x20000000. This makes problems
  // for the IDE / debug probe as a default debug session start would fail as no breakpoint can
  // be set at the beginning of the application (flash) for two reasons:
  //   1) HW breakpoint --> Does not work due to the limitation of the core (does not allow HW BPs at addresses >= 0x20000000)
  //   2) Software breakpoint --> Does not work as it is flash memory
  //
  // Respecting those limitations, the only way to perform a correct debug session start (CPU
  // is halted at the application start (using a breakpoint) is to use flash breakpoints. Unfortunately,
  // the flash cannot be access after reset as it is enabled when the bootloader is executed. As there
  // is no option to halt the CPU *after* bootloader execution and *before* any target application code has been executed,
  // we perform some parts of the bootloader manually which allow us to program the flash and therefore allow us to set a
  // flash breakpoint at the application start.
  //
  // The sequence below comes from ClouderSemi.
  // SEGGER does neither provide any support for it nor guarantees the correct functionality.
  //
  JLINK_SYS_Report("Executing AfterResetTarget()");  
  JLINK_MEM_WriteU32(0x4009B050, 0x3C);
  JLINK_MEM_WriteU32(0x40085000, 0x10);
  JLINK_MEM_WriteU32(0x40085008, 0x8);
  JLINK_MEM_WriteU32(0x4008500C, 0x3);
  JLINK_MEM_WriteU32(0x40085010, 0x18);
  JLINK_MEM_WriteU32(0x4008502C, 0x0);
  JLINK_MEM_WriteU32(0x40085004, 0x3012);  
  return 0;
}

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