S32k3 power on reset issue

[jimmy623]

Hi NXP,

     In S32k358 ,I start from LpuartFlexio_Uart_Ip_Example_S32K358 ,

build download and power on reset ,it boot  5 times  automatically,(normally boot only once)

How can i deal with this,Thanks !

my mian.c :

int main(void)

{

    Clock_Ip_Init(&Clock_Ip_aClockConfig[0]);

    Siul2_Port_Ip_Init(NUM_OF_CONFIGURED_PINS0,g_pin_mux_InitConfigArr0);

    IntCtrl_Ip_Init(&IntCtrlConfig_0);

Lpuart_Uart_Ip_Init(LPUART_UART_IP_INSTANCE_USING_1, &Lpuart_Uart_Ip_xHwConfigPB_1_BOARD_INITPERIPHERALS);

IntCtrl_Ip_EnableIrq(LPUART1_IRQn);//uart1 for debug

    IntCtrl_Ip_InstallHandler(LPUART1_IRQn, LPUART_UART_IP_1_IRQHandler, NULL_PTR);

    Lpuart_Uart_Ip_SyncSend(LPUART_UART_IP_INSTANCE_USING_1, (const uint8 *)("welcome\n"), strlen("welcome\n"),100000u);

Mcu_ResetType boot_reason = MCU_NO_RESET_REASON;

boot_reason = Mcu_GetResetReason();

if((MCU_NO_RESET_REASON != boot_reason))

Bootloader_DebugPrint("\n Get Boot_Reason:0x%d\n",boot_reason);

while(1);

}

[danielmartynek]

Hi @jimmy623,

The MC_RGM[FES] register points to an external reset.

Check the SBC or other devices that are connected to reset_b of the MCU on the PCB.

Regards,

Daniel

[jimmy623]

two source connect to RESET_B :
1.PWM
2.SWD for jlink debug
so if PWM generate destructive reset, how can i find out the root cause?
Thanks

[danielmartynek]

Why do you have a PWM signal connected to the reset_b pin?

The reset_b pin should be connected to reset pins of other devices only.

Regards,

Daniel

[jimmy623]

Hi  danielmartynek,

     In RM, mcu/pmic handshake by using PGOOD ,

If PGOOD assertion does not arrive within the configured time, POR WDOG will issue a reset to the MCU.

Can you show me how to enable PGOOD function in fs26.

Thanks!

[danielmartynek]

Hi @jimmy623,

Can you post this question in this community?

https://community.nxp.com/t5/Power-Management/bd-p/Power-Management

Regards,

Daniel