ePBB Development Guide.pdf

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Microtime Computer Inc.List-4-(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-4-(2) :This statement configures MCU I/O pin which drive the LED as GPIO output function.List-4-(3) :Call this function to perform following tasks :● To configure MCU pin which senses the state of button as input function. (PA0 inthis case)● To connect button I/O as interrupt source of EXTI0 (External Interrupt Line 0)● To setup EXTI0 propertiesList-4-(4) :Since interrupt service routine is expected to accomplish all the work, we just call delayroutine and do nothing in the infinite loop.List-4-(5) :These statements configure PA0 as input pin for button sensing and interrupt triggering.List-4-(6) :This statement link PA0 to EXTI0 as interrupt source.List-4-(7) :These statements setup properties and enable interrupt for peripheral EXTI0 (in peripheralmodule).List-4-(8) :These statements setup properties and enable interrupt for channel EXTI0 of NVIC (incore module).List-4-(9) :Once EXTI0 interrupt is triggered, MCU jumps here for servicing interrupt EXTI0. Entry-23of vector table defines the entry point of EXTI0. Usually vector table is coded in assemblyform and should be treated as part of startup program. Checking file "startup_stm32f2xx.s"for details about that.List-4-(10) :To response the interrupt (Button Press) by toggling LED.List-4-(11) :To clear the EXTI0 pending bit and allow the next trigger of interrupt EXTI0.3.2. OS_uCOS-II Sample ProjectsImportant :Under \ePBB\Libraries\uCOS-II, we keep the directory structure same as Micrium provided, but thatdoesn't mean we provide all the source code you need for application building. To evaluate all the uCOSexamples that ePBB provided, you still have to get the kernel source and fix-up/overwrite the ePBBpackage. Appendix-A figures out more details about that.ePPB Development Guide 3-8
Microtime Computer Inc.3.2.1. Example_1 : Single-Task (LED Blinking)Scenario :This project demonstrates● What does uCOS-II framework contain● How to initialize uCOS-II framework for services● How to create a uCOS-II task for application● What is a typical uCOS-II task looks likeWhen project executing, LED in target board should be set in blink state.Project Browsing :ePBB\Applications\Projects\PTK-STM32F207\EWARM-V6\OS_uCOS-II\base_single_task\demo.ewwFigure-7. Single-Task project (OS_uCOS-II)Code Listing :3-9 ePPB Development Guide
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