PSoC 4 MCU

[Anonymous]

I've been trying to get deep sleep functionality to work on a PSoC module and have not been able to get it to operate correctly. My intended code flow is to do the following:

   

    
• Come out of hibernate with a button press
    
• Connect to a BLE host
    
• Configure sensors and watchdog and go into deep sleep loop
    
• Waking up via watchdog every 5/30 seconds to read and send data over BLE then going back to deep sleep
    
• Return to hibernate when BLE is disconnected for a set amount of time
   

   

The hibernate functionality works fine but the MCU locks up whenever I try to enter deep sleep. I pulled a HandleLowPowerMode function out of a project similar to this one (http://www.cypress.com/blog/100-projects-100-days/project-027-ble-power-consumption-optimization) but it hasn't worked correctly. I also tried speedycat's EasySleep library (http://www.cypress.com/forum/psoc-4-ble/library-called-easysleep) to the same result.

   

When I use HandleLowPowerMode without the CyEnterCriticalSection function calls, the deep sleep loop actually works but causes the BLE to drop. From what I saw in the documentation (and an example project), the BLE connection should remain active through the deep sleep call unless I missed something.

   

    

void HandleLowPowerMode(uint8 lpmSel)
{
    CYBLE_LP_MODE_T sleepMode;
    CYBLE_BLESS_STATE_T blessState;
    uint32_t interruptStatus;
    
    if (lpmSel == DEEPSLEEP)
    {
        sleepMode = CyBle_EnterLPM(CYBLE_BLESS_DEEPSLEEP);
        blessState = CyBle_GetBleSsState();
        interruptStatus = CyEnterCriticalSection();

    

        if(sleepMode == CYBLE_BLESS_DEEPSLEEP)
        {
            if(blessState == CYBLE_BLESS_STATE_ECO_ON || blessState == CYBLE_BLESS_STATE_DEEPSLEEP)
            {
                LCLK_Write(LOW);
                UART_UartPutString("Entering Deep Sleep...");
                UART_UartPutString("\n");
                CyDelay(10);
                CySysPmDeepSleep();
             }
        }
        else if (blessState != CYBLE_BLESS_STATE_EVENT_CLOSE)
        {
            UART_UartPutString("Entering Sleep...");
            UART_UartPutString("\n");
            CyDelay(10);
            CySysClkWriteHfclkDirect(CY_SYS_CLK_HFCLK_ECO);
            CySysClkImoStop();
            CySysPmSleep();
            CySysClkImoStart();
            CySysClkWriteHfclkDirect(CY_SYS_CLK_HFCLK_IMO);
        }
        else
        {}
        
        CyExitCriticalSection(interruptStatus);
    }

    

}

   

   

I have the project attached in addition to the above code block. Any assistance would be appreciated!

[rola_264706 · Accepted solution]

Check out this information it explains the sleep and power reduction issues.