RM4 launchpad dead after flash

Gustavo,

The function setupPLL is used to configure the PLL to the target frequency.
In this example, the CPU is supposed torun at 80Mhz. Internally the PLL is programmed to run at 160Mhz.
To avoid switching from Low to High clock frequency, during PLL lock, the output of the PLL is prescaled (160/32) = 5Mhz
Once the PLL is lock, in the function mapClocks, the prescaler is switched back to /2 making the PLL running at 160/2=80Mhz.

Your following modification in setupPLL are not recommended.

   systemREG1->PLLCTL1 = 0x21046300;                 //80MHz
   systemREG1->PLLCTL2 = 0x3FC0723D;                 //80MHz

Also later on you have:

   systemREG1->CSDISCLR = 0x00000002U;                   // Enable clock source 1
   systemREG1->CSDIS |= 0xf9u;

This is a killer. You are switching off the following clock source:
OSCIN:                                   This clock is the source of the PLL.
Low Frequency LPO
High Frequency LPO           This clock is by default used by the clock detect module to monitor OSCIN.

When you write F9 to CSDIS, you are killing OSCIN. That will kill the PLL. The clock detect will catch a missing OSCIN and will swith to HLPO. But you also killed HLPO. There is no more clock running in your device.
As result, the CPU is stopped, clockless.

When your reset the device, you re-run this deadly sequence. The debugger needs the CPU to reply to a signal (Debug Request), but the CPU will never reply without clock.

One option to revive your board is to use NowFlash. This utility is used to program/erase the flash.

Configure NowFlash as following:

Then click on Execute. A new window will pop up and at the same time, reset the board multiple time using the nRST button (Not the nPORST)
Eventually NowFLash will be able to take control of the device and will be able to erase the flash.

Please let me know the result.