ARMmite Pro - Embedded System and Software Interview Questions
Contents
1. 28 PO 7 SSELO MAT2 0 FERERECERENEE sue FRA HHE FHF HH ces 8898 ESE E ee ge ARMmite Pro Board CORIDIUM 2 Neo mo amp TE E Lie vi bi ti te is ol LR ant 1 Lighten the LED 1 Enable the high speed GPIO on GPIO port 0 PO 15 is the bit 15 of port 0 O Find information about system control and status flags register SCS in LPC2103 user manual O The first bit of the register can enable GPIO port 0 O The register SCS is mapped to memory location OxE01FC1A0 called memory mapped I O L 2 Set the direction of the bit 15 in fast GPIO port 0 O Find information about fast GPIO direction register FIODIR O Bit 15 in FIODIR controls P0 15 Set it to 1 gt P0 15 becomes output O FIODIR is mapped to 0x3FFFC000 O 3 Set the bit 15 in port 0 to LOW O Find information about fast GPIO output clear register FIOCLR O lt is used to produce a LOW level output at a output GPIO FLOSET produces HIGH level O FIOCLR is mapped to 0x3FFFC01C Program in C i FF V PFFKEE include lt arch philips Ipc2103 k9supd h include coridium h void main void SCS 0x01 enable high speed GPIO port 0 FIODIR 1 lt lt 15 set P0 15 as an output FIOCLR 1 lt lt 15 switch P0 15 to LOW level O The header file Ipc2103_k9supd h defines all memory mapped IO in LPC2103 microcontroller O coridium h defines important system dependent inform2. FFCOOO to r2 load content in FIODIR register to r3 fr 1 lt 15 store the value back to FIODIR register load FIOCLR 0x3FFFCO1C to r2 load content in FIOCLR register to r3 rs 16 77 store the value back to FIOCLR register Program in Assembly Me O Notice your assembly file must be named S with capital S or MakeltC can t recognize Put your assembly file Lab1 S under examples and run it by MakeltC It should lighten the onboard LED You could use the cross assembler arm elf gcc to translate a C code into an assembly code Open a new command prompt and go to the folder containing the C file Type arm elf gcc S filename c O A filename s will be generated in the same folder O You can read the file and compare the difference between it and your own assembly code mov instruction only contains 8 bits field for immediate number Idr reg lt constant expression gt is a pseudo instruction it support 32 bits immediate number Idr reg lt constant expression gt will be translated into mov and add instructions Idr r0 0x0c002000 gt mov rO 0x0c000000 add rO rO 0x00002000
3. LABI Outline E Intro to ARMmite Pro development board Intro to LPC2103 microcontroller Cross development environment and tools Program the broad in C light the LED Program the board in ARM Assembly l O OO A O ARMmite Pro o CORIDIUM gt ia SEI ARMniteo PRO PN Tia me FTDI Basic Breakout g ANALOGS 3 USB cable ARMmite pro development board ARMmite Pro a i o uo o_o LI ARMZTDMI CPU running at 60 MHz O 32K Flash memory and 8K SRAM memory LI 7 10 bit A D converters 100 KHz sample rate O 24 TTL compatible digital I O Q 8 Hardware PWM channels LI You need a FTDI bread out board to connect the ARMmite board and your laptop LI User Guide http www coridiumcorp com ARMhelp index htm page HWproPins html O More feature http www coridiumcorp com ARMduino php LPC2103 Microcontroller L L L L L L L L L L The main chip on ARMmite is a LPC2103 microcontroller With 32 bit ARM7TDMI S CPU running at 60MHzZ 32K on chip Flash memory 8K on chip SRAM memory Two 32 bit timers with combined seven capture and compare channels Two 16 bit timers with combined three capture and compare channels Serial interfaces two UARTs two I2C buses SPI 10 bit A D converter provides eight analog inputs Up to thirty two 5V tolerant fast general purpose I O pins Up to 13 edge or level sensitive external interrupt pins Cross Development Environment o O Use laptops host machin
4. ation O Put the file named Lab1 c under examples and run it by MakeltC O If nothing wrong the LED light should become orange Program in Assembly Me text equ SCS OxEOIFCIAO equ FIODIR 0x3FFFC000 equ FIOCLR Ox3FFFCO1 C start global start global main global UNDEF Routine global SWI Routine global PAbt Routine global DAbt Routine global FIQ_Routine b main UNDEF Routine SWI Routine PAbt Routine DAbt Routine FIQ Routine Define SCS as OxEOIFCIAO Define FIODIR as Ox3FFFCOOO Define FIOCLR as Ox3FFFCOIC Execution starts from here Branch to main Bootloader expects these 5 routines Even if we don t really implement them we must define them These are interrupt service routines In the lab we needn t bother about them Write application code here Program in Assembly a main SCS 0x01 orr str Idr Idr FIODIR 1 lt lt 15 mov orr str Idr Idr FIOCLR 1 lt lt 15 mov orr str r2 SCS r3 r2 0 r3 0x01 r3 r2 0 r2 FIODIR r3 r2 0 rl 0x01 r3 rl LSL 15 r3 r2 0 r2 FIOCLR r3 r2 0 rl 0x01 r3 rl LSL 15 r3 r2 0 load SCS OxEO1FC1A0 to r2 load content in SCS register to r3 set the bit O to 1 2 enable fast GPIO port O store the value back to SCS register load FIODIR Ox3F
5. e to develop applications Generate executables for embedded system target machine O Why Because an embedded target isn t a good develop environment ex small memory no keyboard no screen limited I O O Suppose your laptop is x86 architecture LI The ARMmite pro is ARM architecture LI We use cross compiler in our x86 machine to build applications running on ARM machine Install the Tools and Software O0 Coridium provides cross tool trains for Windows in the CD ROM O Install the cross tool trains and development software Install the file setupC exe in the CD coming with your ARMmite board The following steps enable you to use the cross assembler Right click on My Computer and click Properties Click Advanced System Settings and click Environment Variables Under User Variables select PATH and click Edit If a variable named PATH does not exist click New and type in PATH for the variable name Append the following text to the end of the Value field C Program Files Coridium bin C Program Files Coridium arm elf bin Click OK and close all currently open dialog boxes Open a new command prompt by going to Start gt Run typing cmd and click ok Type arm elf gcc v and hit enter If everything went right it will print out some text and the last line should read gcc version 4 1 1 WinARM Run An C Example O Run an C program example provided by Coridium Conn
6. ect the ARMmite broad and the FTID breakout Connect FTID breakout and your computer through USB cable Double click the icon MackltC on your desktop Click Option gt Serial Port gt refresh gt choose correct COM port Click File gt Choose Main Browse and open C Program Files Coridium examples Csample c Click Tools gt Build and Run Click Tools gt Terminal LI Type in an integer into the terminal window and see what happen LI You could read the Csample c file and do some modification O Coridium provides many C functions You can include them to implement your own application O Click Help gt ARMexpress C gt Read the spec of the board The Whole Process O When you click Build and Run the MakeltC software calls the cross compiler to translate the C program Then the linker is called to link the library functions and the application generating an executable Then the loader is called to load the executable into the flash ROM on LPC2103 A bootloader executable is also loaded into the flash ROM When the CPU starts working it first run the bootloader executable which initialize the board ex setup timers initialize interrupt system Then the bootloader moves the application from ROM to RAM and finally the CPU jumps to execute the application program Program in C Lighten the LED O O The previous C
7. program example calls library functions In the following exercise we don t use functions provided in the library We want to directly control the I O pins You need to read the hardware specs of both ARMmite pro and LPC2103 Goal lighten the LED on the board LPC2103 User Manual http www nxp com documents user manual UM10161 pdf ARMmite pro User Guide http www coridiumcorp com ARMhelp index htm page HWproPins html ARMmite pro schematic http www sparkfun com datasheets DevTools ARMproSCH pdf ARMmite SCH Ni 20 MHz MAZZO R ETO Bo XD RXDO X02 open drain x06___open drain 21 Ba 2 POS PO Laci SUS POSITXDI K POS RXD1 ADO 5 P10 i abe BM ra P gt VM 41 p13 EINTO ag P15 open drain PIE open drain p 48 PWMIZ PWMI3 BIOMO ADOO P21 ADO ADDOZ la ADOE AL 9 P29 PWN SS output oniy 27 a C6 c7 22pF 22pF 32 KHz not loaded LED is controlled by the pin P0 15 of LPC2103 LPC2103 Pin Out E 3 4a k E HH JE LED lled by th REND E 385 is controlled by the 32868 8 8338 in PO 15 of LPC2103 sssss 883 8335 p gt aca 36 PO 11 CTS1 CAP1 1 ADO 4 35 PO 10 RTS1 CAP1 0 ADO 3 PO 19 MAT1 2 MISO1 1 PO 20 MAT1 3 MOSI1 O P0 21 SSEL1 MAT3 0 3 134 P0 24 A00 2 VBAT 4 133 PO ZWADO 1 Vonx1ve LE 132 PO 22 AD0 0 RST 6 131 Vssa LPC2101 2102 2103 130 PO 9 RXD1 MAT2 2 PO 27 TRSTICAPZO 8 29 PO 8 TXD1 MATZ 1 P0 28 TMS CAP2 1 9
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