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Chapter 8
Table 8-9 describes the constants usually defined in app_cfg.h which allows you to use the
serial demo.
8
Constant
APP_CFG_USBD_CDC_EN
APP_CFG_USBD_CDC_SERIAL_TEST_EN
APP_CFG_USBD_CDC_SERIAL_TASK_PRIO
APP_CFG_USBD_CDC_SERIAL_TASK_STK_SIZE
Description
General constant to enable the CDC ACM demo application.
Must be set to DEF_ENABLED .
Constant to enable the serial demo. Must be set to
DEF_ENABLED .
Priority of the task used by the serial demo.
Stack size of the task used by the serial demo. A default
value can be 256.
Table 8-9 Device Application Configuration Constants
RUNNING THE DEMO APPLICATION
In this section, we will assume Windows as the host operating system. Upon connection of
your CDC ACM device, Windows will enumerate your device and load the native driver
usbser.sys to handle the device communication. The first time you connect your device to
the host, you will have to indicate to Windows which driver to load using an INF file (refer
to section 3-1-1 “About INF Files” on page 46 for more details about INF). The INF file tells
Windows to load the usbser.sys driver. Indicating the INF file to Windows has to be done
only once. Windows will then automatically recognize the CDC ACM device and load the
proper driver for any new connection. The process of indicating the INF file may vary
according to the Windows operating system version:
■
Windows XP directly opens the Found New Hardware Wizard. Follow the different steps
of the wizard until you reach the page where you can indicate the path of the INF file.
■
Windows Vista and later won’t open a “Found New Hardware Wizard”. It will just
indicate that no driver was found for the vendor device. You have to manually open the
wizard. When you open the Device Manager, your CDC ACM device should appear
with a yellow icon. Right-click on your device and choose ‘Update Driver Software...’ to
open the wizard. Follow the different steps of the wizard until the page where you can
indicate the path of the INF file.
130
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