ePBB Development Guide.pdf

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Microtime Computer Inc.Code Listing :List-2. Button Project execution starts at main() (Standalone : main.c)List-2-(1) :Call this function to perform system initialization for PTK board, such as toggling systemreset signal to reset all the connected I/O devices.List-2-(2) :This statement configures MCU I/O pins which connect to the buttons as GPIO inputfunction.List-2-(3) :This statement configures MCU I/O pins which drive the LEDs as GPIO output function.List-2-(4) :Here we turn the LED off, the argument indicates which LED should be controlled.List-2-(5) :The always true statement leads to the infinite loop operation. The following statementsare involved in this never ending story.List-2-(6) :Call this function to get the state of button (Pressed or Released). Using the returned stateto compare with condition "KEY_PRESSED".List-2-(7) :If given condition is TRUE, i.e. the button is pressed, function module_led_on(LED0_IDX)will get executed. This leads to LED0 be turned ON.List-2-(8) :If given condition is not TRUE, i.e. the button is released, functionmodule_led_off(LED0_IDX) will get executed. This leads to LED0 be turned OFF.ePPB Development Guide 3-4
Microtime Computer Inc.3.1.3. Example_3 : Buzzer BeepingScenario :This project initializes and configures the GPIO ports of MCU which connects to the buzzer for tonegeneration. After I/O port being initialized, code then runs into an infinite loop and perform thefollowing tasks :● The buzzer start beeping for a specified period● The buzzer stop beeping for a specified periodProject Browsing :ePBB\Applications\Projects\PTK-STM32F207\EWARM-V6\ OS_None \base_buzzer\demo.ewwApplication groupStartup programmain() programePBB LibrariesPTK Buzzerdevice driverPTK board levelInitial programMCU peripheralsdriverProject map fileProject image fileFigure-5. Buzzer project (Standalone)Code Listing :List-3. Buzzer Project execution starts at main() (Standalone : main.c)3-5 ePPB Development Guide
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