topic Re: Unintended resume from DeepSleep in LPC Microcontrollers

Unintended resume from DeepSleep

hamatron — Thu, 13 Jan 2022 11:20:16 GMT

I am developing a USB device with LPC55S66.
I implemented suspend/resume using the SDK sample of power_manager_lpc as a reference, and it seemed to work well, but after a few minutes after suspend, it resumes. At this time, the PC is still in sleep mode and no other USB devices are being resumed.

I have set only WAKEUP_USB1_NEEDCLK and WAKEUP_USB1 as the wake-up source for Deep Sleep.

What could be the cause?
Thanks in advance.

Re: Unintended resume from DeepSleep

ZhangJennie — Mon, 17 Jan 2022 10:12:53 GMT

Did you revise demo code power_manager_lpc?

How can I reproduce your problem?

Thanks,

Jun Zhang

Re: Unintended resume from DeepSleep

hamatron — Tue, 18 Jan 2022 02:26:13 GMT

Sorry, I made a mistake with the SDK sample I referenced. The correct one is dev_suspend_resume_hid_mouse_bm.
The changes I made were to the exclusions from sleep, wake-up source, and RAM retention settings.　However, even before I made this change, it was getting angry at me for resuming from suspend.

#if ((defined(USB_DEVICE_CONFIG_LPCIP3511HS)) && (USB_DEVICE_CONFIG_LPCIP3511HS > 0U)) #define APP_EXCLUDE_FROM_DEEPSLEEP \ (kPDRUNCFG_PD_USB1_PHY | kPDRUNCFG_PD_LDOUSBHS) #define APP_DEEPSLEEP_WAKEUP_SOURCE (WAKEUP_USB1_NEEDCLK | WAKEUP_USB1) #define APP_DEEPSLEEP_SRAM_RETENTION (0x7FFF) #endif

I also changed the USB_LowPowerPreSwitchHook to power save DAC/ACD, LED drivers, etc.

void USB_PowerPreSwitchHook(void) { // software shutdown LED driver // LED32327_WriteRegister(LED_DEMO_I2C_BASE_ADDRESS,LED_DEMO_I2C_ADDRESS, 0x00, 0); // hardware shutdown LED driver GPIO_PinWrite(GPIO, 0, 2, 0); // mute dac and set direction to IN GPIO_PinWrite(GPIO, 0, 24, 0); gpio_pin_config_t mute_dac_pin; mute_dac_pin.pinDirection = kGPIO_DigitalInput; GPIO_PinInit(GPIO, 0, 24, &mute_dac_pin); // power-down ADC TLV320ADC3100_Deinit(); // stop audio stop_audio(); //211116 /* set high of InRush Current Test Control Pin */ GPIO_PinWrite(GPIO, 0, 22, 0); USB_PreLowpowerMode(); }

Thanks.