FRDM-MCXN947 Detection of USB_HS Connection

Doly02 — Tue, 29 Oct 2024 14:46:01 GMT

Hello,

in my application on FRDM-MCX947 board that's based on FreeRTOS, I try to detect USB_HS using USB stack. I always have a situation that the first connection after starting the program is not detected by the interrupt (it does not jump to the USB1_HS_IRQHandler) and when disconnecting the USB1_HS_IRQHandler is called, the next connection is also detected, but once in a while it drops out again.

In the main function in the initialization phase, I initialize the USB stack and enable the interrupt:

void APP_UsbInit(void) { USB_DeviceClockInit(); g_msc.speed = USB_SPEED_FULL; g_msc.attach = 0; g_msc.deviceHandle = NULL; if (kStatus_USB_Success != USB_DeviceInit(CONTROLLER_ID, USB_DeviceCallback, &g_msc.deviceHandle)) { usb_echo("USB device mass storage init failed\r\n"); return; } SDK_DelayAtLeastUs(5000, SDK_DEVICE_MAXIMUM_CPU_CLOCK_FREQUENCY); USB_DeviceIsrEnable(); } void USB_DeviceIsrEnable(void) { uint8_t irqNumber; uint8_t usbDeviceEhciIrq[] = USBHS_IRQS; irqNumber = usbDeviceEhciIrq[CONTROLLER_ID - kUSB_ControllerEhci0]; /* Install isr, set priority, and enable IRQ. */ DisableIRQ((IRQn_Type)irqNumber); NVIC_SetPriority((IRQn_Type)irqNumber, USB_DEVICE_INTERRUPT_PRIORITY); EnableIRQ((IRQn_Type)irqNumber); }

Then, if a connected USB is detected, I initialize Mass Storage and switch the program to Mass Storage mode using a semaphore, however, it is probably not invoked on the first connection:

void USB1_HS_IRQHandler(void) { BaseType_t xHigherPriorityTaskWoken = pdFALSE; if (false == bMscInitialized) { /* Initialize The Mass Storage Device Application */ /* @note Initialization SD Card In Device Mode */ USB_DeviceApplicationInit(); bMscInitialized = true; } USB_DeviceEhciIsrFunction(g_msc.deviceHandle); /* Free The Mutex For Mass Storage Task */ xSemaphoreGiveFromISR(g_TaskMutex, &xHigherPriorityTaskWoken); /** * Switch The Context From ISR To a Higher Priority Task, * Without Waiting For The Next Scheduler Tick. **/ portYIELD_FROM_ISR(xHigherPriorityTaskWoken); }

I would like to ask if there is anything else to add during initialization to make my detection work properly. Thank you in advance for all your advice.

Re: FRDM-MCXN947 Detection of USB_HS Connection

Alice_Yang — Thu, 31 Oct 2024 09:50:10 GMT

Hello @Doly02

I recommend that you first run the SDK demo dev_msc_disk_bm to check whether it works well on your side. This will help us determine if the issue is specific to your setup or the configuration.

Alice

Re: FRDM-MCXN947 Detection of USB_HS Connection

Doly02 — Thu, 31 Oct 2024 14:34:22 GMT

Hi @Alice_Yang,

I have tried dev_msc_disk_bm, dev_msc_disk_bm_lite and dev_msc_disk_freertos and they all works fine. It looks like it's some configuration issue, my code is based on dev_msc_disk_bm_lite.

Re: FRDM-MCXN947 Detection of USB_HS Connection

Alice_Yang — Fri, 01 Nov 2024 04:23:22 GMT

Hello @Doly02

So, I recommend that you check your modified code. You can try changing one modification at a time to isolate the issue.

Alice

Re: FRDM-MCXN947 Detection of USB_HS Connection

Doly02 — Fri, 01 Nov 2024 16:27:05 GMT

Dear @Alice_Yang,

Thank you for your helpful thought, I wouldn't have figured it out without you.

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