ePBB Development Guide.pdf

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Microtime Computer Inc.List-9-(1) :The application setup interrupt vector for EXTI0 by calling BSP_IntVectSet() . The interruptID and function pointer are passed as arguments.List-9-(2) :BSP_IntVectSet() maintains a data structure, BSP_IntVectTbl[ ], to keep function pointerswhich point to corresponding interrupt service routines for system. In our case, functionpointer EXTI0_IRQHandler is placed at entry BSP_INT_ID_EXTI0 of BSP_IntVectTbl[].List-9-(3) :After button being pressed, interrupt EXTI0 is triggered and interrupt table is searched forMCU execution jump.List-9-(4) :MCU decides to jump to BSP_IntHandlerEXTI0() according the result of table searching.List-9-(5) :BSP_IntHandler() handles all of the interrupt requests by checking BSP_IntVectTbl[] anddispatching them accordingly. Following descriptions depict more details about that.List-9-(6) :Use int_id as index to get function pinter from BSP_IntVectTbl[]List-9-(7) :EXTI0_IRQHandler is chosen and assigned to isr.List-9-(8) :EXTI0_IRQHandler() is finally executed.3.2.4. Example_4 : Console Application : Hello World !!!Scenario :This project demonstrates how to create console, RS-232 communication, for PC host to link with.Not only for application use, dump messages via console for debugging and analysis is also helpful.There are more requirements in system installation for this project :● Terminal Emulation software should be installed in your host computer, use Hyper-Terminalin our case.● Setup communication properties for terminal emulator : 115200, N, 8, 1● Use standard RS-232 cable to link target board with PC host.Below shows the system configuration needed for console projectePPB Development Guide 3-18
Cortex-M3Debug + ETMMicrotime Computer Inc.PC-HOST :1. Debugger2. Terminal110V12V DCAdaptoriMacDC-12VCN1DCDCCN15RJ-45D12USB CableRS-232 CableCN2CN12PWR_DBGCN5CN6RF-EXT-1PTK-BASECN13PHYCN16PER-EXTCN19BOOT0CN7CN8J-Link Lite ARM20-Pin JTAG CableCN11BUZZERSU1PTK-MCU-STM32F207JP1MEMS-2U7CN18CN9CN10MEMS-1RESETU5KEY3KEY2KEY1KEY0HEX1VR1D11CN4TemperatureU3JP1DIP-SWLightLED3LED2LED1LED0POWERFigure-10. System configuration for console projectBelow shows steps needed for system test :● Invoke terminal emulation program and connect to the COM port which linked to our targetsystem.● Load the project and run the target board, or reset target board if it is already in runningstate.● Message "Hello World !!!" shows on terminal.● Target board responses any key stroke in PC terminal with the same character it received.Figure-11. Snapshot of Hello World !!!Project Browsing :ePBB\Applications\Projects\PTK-STM32F207\EWARM-V6\OS_uCOS-II\base_uart\demo.eww3-19 ePPB Development Guide
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