topic Re: Bare-metal on KL03: in Kinetis Microcontrollers

Bare-metal on KL03:

chucksmith — Fri, 15 Jul 2016 23:36:49 GMT

Hello, after trying out some code on a FRDM-KL03Z, we now want to run it on our bare-metal KL03Z32VFG4 based design. Using KDS and a J-Link, I load the code into the board, but I cannot hit the breakpoint at main(), and cannot even hit a breakpoint in the .S startup file. When I pause the execution, the program counter seems to be in the ROM Bootloader (0x1C00070E). The NMI pin is pulled low on our board, but the flash configuration values in startup_MKL03Z4.s are:

/* Flash Configuration */

.section .FlashConfig, "a"

.long 0xFFFFFFFF

.long 0xFFFF3DFE

I believe the 3D disables the NMI function, and says boot from Flash.

So, how to give our application control?

Thanks

Re: Bare-metal on KL03:

jeremyzhou — Mon, 18 Jul 2016 09:40:29 GMT

Hi Chuck,

According to your statement, the MCU obviously are stuck in the Bootloader mode, the 0x30 means the setting of Fig 1.

Actually, you should set the 0x3F to FTFA_FOPT register, instead of the 0x3D.

Fig 1

Have a great day,
Ping

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Re: Bare-metal on KL03:

chucksmith — Mon, 18 Jul 2016 17:02:35 GMT

Hi Jeremy - that got me looking in the right area. I actually had to use a value of 0x3B to get it to boot to flash. Its now working. Thanks.