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Getting Started with ADSP-BF548 EZ-KIT Lite 6-9
Using ADSP-BF548 EZ-KIT Lite Keypad and LED Indicator
Each source file that the Project Wizard generates in response to a new
thread type definition in the Kernel tab contains skeleton definitions of
four functions:
• An initialization function called when an instance of the thread
type is created by VDK as a boot thread (or by some other thread
in the application)
• A termination function called when an instance of the thread type
is destroyed automatically by VDK (or programmatically by the
application)
• An error function called by VDK API functions to report an error
condition
• A run function called by VDK to start execution of the thread
instance. The thread exists until the run function returns (unless
terminated programmatically)
The
BootThreadType.c file of example 7 adds no extra code to the initial-
ization, termination, or error functions—the default code in the functions
is sufficient for the application. Listing 6-2 shows the code added to the
thread’s run function.
Listing 6-2. BootThreadType’s Run() Function
void
BootThreadType_RunFunction(void **inPtr)
{
bool running = true;
/* get device descriptor for keypad from VDK-style driver */
VDK_DeviceDescriptor keypad_dd =
VDK_OpenDevice(kKeypad, NULL);
/* create thread instance that will display row and */
/* column values on LEDs */
VDK_ThreadID LEDthread = VDK_CreateThread(kLEDThreadType);