Problem:
I am working on USB, CDC ACM, USB Mass Storage (using SD Card). I currently want to be able to still use the USB stack functions with only my USB Mass Storage being deactivated. The caveat being, the deactivation happens during runtime (not compile time, hence cannot solve this by using KConfig). I need it during runtime because I want to do a check if whether or not my SD Card is plugged in or not. The current problem is in which the automatic USB storage pop up will show in windows. I need to stop that pop up from showing through modifying the device kernel logic on.
Here is my current `prj.conf`
# Enable USB subsystem CONFIG_USB_COMPOSITE_DEVICE=y CONFIG_UART_ASYNC_API=y CONFIG_SERIAL=y CONFIG_USB_DEVICE_PRODUCT="My Nordic USB Device" CONFIG_USB_DEVICE_PID=0x530E # --- Disable USB logging/console output --- CONFIG_UART_CONSOLE=n CONFIG_LOG_BACKEND_UART=n CONFIG_USB_DRIVER_LOG_LEVEL_OFF=y CONFIG_USB_DEVICE_LOG_LEVEL_OFF=y # Enable the UART driver CONFIG_UART_LINE_CTRL=y CONFIG_UART_INTERRUPT_DRIVEN=y CONFIG_UART_ASYNC_ADAPTER=y CONFIG_USB_DEVICE_STACK=y CONFIG_USB_DEVICE_REMOTE_WAKEUP=n CONFIG_USB_CDC_ACM=y CONFIG_USB_CDC_ACM_LOG_LEVEL_OFF=y # Enable Sdcard CONFIG_DISK_DRIVER_SDMMC=y CONFIG_FILE_SYSTEM=y CONFIG_FAT_FILESYSTEM_ELM=y CONFIG_FS_FATFS_LFN=y CONFIG_FS_FATFS_MAX_LFN=255 # Enable Storae-Mass CONFIG_USB_MASS_STORAGE=y CONFIG_USB_DEVICE_LOG_LEVEL_ERR=y CONFIG_USB_MASS_STORAGE_LOG_LEVEL_ERR=y CONFIG_USB_DEVICE_INITIALIZE_AT_BOOT=n CONFIG_MASS_STORAGE_DISK_NAME="SD"
This image shows the popup everytime I plugin or reset my device, I need this popup to stop showing, even when my SD Card is not plugged in.
I've tried modifying the `msc.c` to do a check. But adding this line comprimises the USB stack, it causes the `usb_dc_status_code == USB_DC_SUSPEND`
static void mass_interface_config(struct usb_desc_header *head,
uint8_t bInterfaceNumber)
{
ARG_UNUSED(head);
// ADDED THIS_START
if (disk_access_init(disk_pdrv) != 0) {
LOG_ERR("Storage init ERROR !!!! - Aborting USB Mass Storage Interface Config");
return -ENODEV;
}
// ADDED THIS_END
mass_cfg.if0.bInterfaceNumber = bInterfaceNumber;
}
/* Configuration of the Mass Storage Device send to the USB Driver */
USBD_DEFINE_CFG_DATA(mass_storage_config) = {
.usb_device_description = NULL,
.interface_config = mass_interface_config,
.interface_descriptor = &mass_cfg.if0,
.cb_usb_status = mass_storage_status_cb,
.interface = {
.class_handler = mass_storage_class_handle_req,
.custom_handler = NULL,
},
.num_endpoints = ARRAY_SIZE(mass_ep_data),
.endpoint = mass_ep_data
};
I've also tried modifying the `mass_storage_init()` like such. But the popup still shows. The macro is just for simple example. The real implementation would be using a zbus or something to suspend and then notify this very function after the sdcard status is confirmed (whether is inserted or not).
#define TEST_STOP_MSC true
static int mass_storage_init(void)
{
uint32_t block_size = 0U;
if (TEST_STOP_MSC) {
return 0;
}
if (disk_access_init(disk_pdrv) != 0) {
LOG_ERR("Storage init ERROR !!!! - Aborting USB init");
return 0;
}
