topic Re: NMI_B not beeing inserted on KL03Z in Kinetis Microcontrollers

NMI_B not beeing inserted on KL03Z

tomazlov — Tue, 16 Jul 2019 14:04:13 GMT

I have Kinetis MKL03Z8VFG4 on custom board and trying to setup NMI interrupt handler to handle logic 0 during the boot (i.e. external device is connected to pin PTB5/IRQ_12/NMI_b and pulling to GND). I have setup MWE from SDK 2.x example where FOPT register is beeing set:

__attribute__ ((used,section(".FlashConfig"))) const struct {
   unsigned int word1;
   unsigned int word2;
   unsigned int word3;
   unsigned int word4;
} Flash_Config = {0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFF3FFE};

Looking into datasheet my configuration sets:

BOOTSRC_SEL = 00 (Boot from FLASH),
FAST_INIT = 1 (Fast Initialization),
RESET_PIN_CFG = 1 (RESET_b pin is dedicated),
NMI_DIS = 1 (NMI_b pin/interrupts reset default to enabled),
BOOTPIN_OPT = 1 ( Boot source configured by FOPT[7:6] ( BOOTSRC_SEL) bits),
LPBOOT = 11 (Core and system clock divider (OUTDIV1) is 0x0).

Then I override default WEAK IRQ handler by defining:

void NMI_Handler(void)
{
   LED_RED_ON();
   delayMS(1000);
   // TODO: handle NMI_b pin state
}

..but PC never goes into this function.

Why is NMI_Handler(void) not beeing called, I am missing something?

Re: NMI_B not beeing inserted on KL03Z

mjbcswitzerland — Tue, 16 Jul 2019 17:39:38 GMT

NMI_DIS = 1 (NMI_b pin/interrupts reset default to enabled),

is incorrect. A '1' disables the NMI and doesn't enable it.

Regards

Mark

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Re: NMI_B not beeing inserted on KL03Z

tomazlov — Wed, 21 Aug 2019 16:43:07 GMT

Mark, I still think your answer in incorrect: settings logic '1' to NMI_DIS does enable NMI pin (as opposed to human understanding of the register flag name). More information can be found in:

https://community.nxp.com/message/498526?commentID=498526#comment-498526 (KL02_NMI.pdf)

https://www.nxp.com/docs/en/reference-manual/KL03P24M48SF0RM.pdf (Table 6-2. Flash Option Register (FTFA_FOPT) definition)

Re: NMI_B not beeing inserted on KL03Z

mjbcswitzerland — Wed, 21 Aug 2019 20:59:58 GMT

Tomaz

You are right that I seem to have made a mistake in my statement since '1' enables the NMI pin and '0' disables it.
These are the definitions that I use:

#define FTFL_FOPT_NMI_DISABLED 0x00
#define FTFL_FOPT_NMI_ENABLED 0x04

Regards

Mark