PSoC 4 MCU

[HeGi_2497906]

This was the original problem I started with, CYBLE-012011 Hibernate and Stop modes

It was pointed out the UNFREEZEIO(); was not the first program line, that is now corrected.

int main(void)

{

    // wake up from stop un freeze gpio

    CySysPmUnfreezeIo();

    // ensure not used IO are set to analog Hiz

    LP_temp_1_SetDriveMode(LP_temp_1_DM_ALG_HIZ);

    LP_temp_2_SetDriveMode(LP_temp_2_DM_ALG_HIZ);

    LP_temp_3_SetDriveMode(LP_temp_3_DM_ALG_HIZ);

    LP_temp_4_SetDriveMode(LP_temp_4_DM_ALG_HIZ);

    LP_temp_5_SetDriveMode(LP_temp_5_DM_ALG_HIZ);

    LP_temp_6_SetDriveMode(LP_temp_6_DM_ALG_HIZ);

The below code apparently enters STOP mode, and will wakeup from STOP with a High to Low on P2(2) for about 1 minute, after that the unit fails to reset with the transition on P2(2), only POR and XRES work after that.

        //*******************************************************************

        // Hiberate by timer, flag, or button set Switch3 to wake up

        //*******************************************************************

        if (sleepTimer == FALSE || hibernateFlag == TRUE || Off_count >= 3)

        {

            isr_All_SW_Disable();

            DBG_PRINTF("\n\rEnterng Hibernate mode  -> Sleep %i, Flag %d, Count %d\r\n", sleepTimer,hibernateFlag,Off_control);

            CyBle_GapDisconnect(connHandle.bdHandle);

            CyBle_ProcessEvents();

            DBG_PRINT_TEXT("\n\r Disconnected from any devices\r\n");           

            while(CyBle_GattGetBusyStatus() == CYBLE_STACK_STATE_BUSY);

            CyBle_Stop();           

            CyDelay(50);

            DBG_PRINT_TEXT("\n\r BLE Stack stopped\r\n");

            WDT_Stop();

            DBG_PRINT_TEXT("\n\r WDT stopped\r\n");           

            Wakeup_Wakeup();

            DBG_PRINT_TEXT("\n\r Enable Wakeup Pin \r\n");

            PWM_WriteCompare(0xffff);

            DBG_PRINT_TEXT("\n\r LED Off\r\n");           

            Clock_1_Stop();

            DBG_PRINT_TEXT("\n\r PWM stopped\r\n");           

            isr_W_StartEx(Hibernate_isr);

            DBG_PRINT_TEXT("\n\r Entering Hibernate final\r\n");           

            UART_Stop();

            UART_GND_SetDriveMode(UART_GND_DM_ALG_HIZ);

            CySysPmSetWakeupPolarity(CY_PM_STOP_WAKEUP_ACTIVE_LOW);

            CyDelay(1000);

            CySysPmStop();

         }

Here is the schematic

To recap, within 1 minute of executing the below code, I can reset from STOP with a High to Low on P2(2), after 1 minute the unit will only reset with a POR or XRES.  My bundle is attached.

[HeGi_2497906]

My inputs are set as PULL UPS with CMOS 1.8V level, what effect can the level have?

[HeGi_2497906 · Accepted solution]

This is fact, for some reason we had selected CMOS1.8V levels, not really understanding what that did, but when we tried to use CYSYSPMSTOP(); it would lock up in about 1 minute, Hibernate did not care.

Warning, ensure that your IO level is correct for STOP mode, not sure of the deeper explanation, but perhaps Cypress can fill in the gap.  I good explanation of the IO levels and their effects, which I do not have time to research now.

Herb