Hands-On RTOS with Microcontrollers

Private functions

usbTask is a private function that takes care of the initial setup of our CDC overrides. It also monitors the stream buffer and task notifications, making the required calls to the CDC implementation provided by STM.

Before starting its main loop, there are a few items that need to be initialized:

1. The task must wait until all of the underlying peripherals and USB stack initialization are performed. This is because the task will be accessing data structures created by the USB CDC stack:

  USBD_CDC_HandleTypeDef *hcdc = NULL;  while(hcdc == NULL)  {    hcdc = (USBD_CDC_HandleTypeDef*)hUsbDeviceFS.pClassData;    vTaskDelay(10);  }

2. A task notification is given, provided a transmission is not already in progress. The notification is ...