ePBB Development Guide.pdf

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Microtime Computer Inc.List-3-(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-3-(2) :This statement configures MCU I/O pins which connect to the buzzer as GPIO outputfunction. The tone frequency of beep sound is also configured to default value of 500Hz.List-3-(3) :The always true statement leads to the infinite loop operation. The following statementsare involved in this never ending story.List-3-(4) :Call this function to turn buzzer on and start beeping at 500Hz tone frequency.List-3-(5) :This delay routine allow MCU to be "postponed" for a specified period. The argumentspecifies the delay time in unit of millisecond (1/1000 seconds).List-3-(6) :Call this function to turn buzzer off.3.1.4. Example_4 : InterruptScenario :This project demonstrates● How I/O pins can be configured as a trigger device for interrupt triggering.● How interrupt mechanism in core and peripheral module should be organized for properoperation.● How the service routine is linked, so MCU can jump to the right place for interrupt servicing.When project executing, press the button in target board, KEY0, and check if LED is toggledaccordingly.Note :The control process and code explanation shown in this section is specifically used forPTK-STM32F207 and may not be applied for other platforms.Project Browsing :ePBB\Applications\Projects\PTK-STM32F207\EWARM-V6\OS_None\base_button_irq\demo.ewwePPB Development Guide 3-6
Microtime Computer Inc.Figure-6. Interrupt project (Standalone)Code Listing :List-4. Trigger Interrupt via Button (Standalone : main.c)3-7 ePPB Development Guide
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