BACKGROUND

As an embedded system engineer of a local consulting company, you are tasked to familiarize with

the recently acquired NUCLEO$-$F$411$RE and ESP$32$C$3$ boards $->$ by coming up with some

hardware wiring $($breadboarding$)$ and software developments in assembly languages.

PART $1$ UTILIZATION OF CORTEX$-$M$4$ BOARD

Use the theoretical and practical knowledge$/$skills gathered so far to undertake TASK $1\mathrm{.}1$A through

TASK $1\mathrm{.}1$B below, which deal with writing an ARM processor assembly language $($Keil

environment$)$ to satisfy the specified requirements from your company.

Note:

$-$ The green LED $($LD$2)$ also termed as LED$1$ available on the NUCLEO$-$F$411$RE board is active

high.

$-$ Select the following STM$32$ chip when a new Keil $$Vision Project is created using Keil IDE

version $4$: STM$32$F$401$RE$.$

$-$ Each of your project should contain at least two $(2)$ main files namely the

$$startup$\_$stm$32$f$401$xx$.$s$$ file and $$your$\_$main$\_$file.s$.$ Using assembly language, you need to

comment out $($remove by commenting, using a semicolon$)$ the boldface letters in the following

assembly code fragment of the $$startup$\_$stm$32$f$401$xx$.$s$$ file:

Code Fragment $1$

; Reset Handler

Reset$\_$Handler PROC

EXPORT Reset$\_$Handler $[$WEAK$]$

;$->$ Line $180$ IMPORT SystemInit

IMPORT $\_\_$main

;$->$ Line $183$ LDR R$0,=$SystemInit

$2$

;$->$ Line $184$ BLX R$0$

LDR R$0,=\_\_$main

BX R$0$

ENDP

Code Fragment $2$

; User Initial Stack & Heap

IF :DEF:$\_\_$MICROLIB

EXPORT $\_\_$initial$\_$sp

EXPORT $\_\_$heap$\_$base

EXPORT $\_\_$heap$\_$limit

ELSE

;$->$ Line $367$ IMPORT $\_\_$use$\_$two$\_$region$\_$memory

EXPORT $\_\_$user$\_$initial$\_$stackheap

$\_\_$user$\_$initial$\_$stackheap

Note: It is advisable that you save the modified startup file to a slightly different name from the

original one, as the contents of the original startup file should remain unaltered.

Task $1\mathrm{.}1$A: Activation$/$Deactivation of Output Devices $($LEDs$)$ by NUCLEO$-$F$411$RE Board

i$)$ Using GPIOA$\_$ODR $($not GPIOA$\_$BSRR here$),$ blink the NUCLEO$-$F$411$RE board$$s green

LED $($labelled as LD$2)$ to be called as LED$1.$ Note: LD$2$ is connected to the PA$5$ pin.

$[7$ points$]$

ii$)$ Using GPIOA$\_$BSRR $($not GPIOA$\_$ODR$),$ blink the NUCLEO$-$F$411$RE board$$s green LED $$

i$.$e$.,$ LD$2/$LED$1$ which is stated in part $1\mathrm{.}1$A$($i$).$

$[7$ points$]$

iii$)$ Using GPIOB$\_$BSRR$,$ continuously illuminate an external $($preferably red$)$ LED using Port C

$$ to be called as LED$2.$ Note: LED$2$ is to be active high.

$[5$ points$]$

iv$)$ Using GPIOB$\_$ODR, continuously illuminate the active high red LED $($LED$2)$ stated in part

$1\mathrm{.}1$A$($iii$).$

$[5$ points$]$

v$)$ Using GPIO$\_$ODR, blink LED$2$ stated in part $($c$)$ using a suitable time delay.

$[7$ points$]$

Task $1\mathrm{.}1$B: Display of Static Message on Output Device $($LCD$)$ using Assembly Language

Develop an assembly language program for the NUCLEO$-$F$411$RE processor to display the

following messages on the LCD display:

Row $1$:

Row $2$: $<>$

$[25$ points$]$

$3$

Note: As a guide, refer to the Motorola $68000$ assembly program $1$a$\_$congrats.asm$$ provided

by the instructor.

PART $2$ UTILIZATION OF ESP$32$C$3-$BASED BOARD

In the tasks below, you are to write a RISC V processor assembly language $($Code::Blocks

environment$)$ to satisfy the specified requirements from your company. In this part, you are free to

choose any port and pin of the ESP$32$C$3$ chip as input.

Task $1\mathrm{.}2$A: Activation$/$Deactivation of Output Devices $($LEDs$)$ by ESP$32$C$3$ Board

i$)$ Using a port and pin of your choice, continuously illuminate an external $($preferably yellow$)$

LED $$ to be called as LED$3.$ Note: LED$3$ is to be active low.

$[5$ points$]$

ii$)$ Blink LED$3$ stated in part $1\mathrm{.}2$A$($i$)$ using a suitable time delay.

$[7$ points$]$

iii$)$ Using a port and pin of your choice, continuously illuminate an external $($preferably green$)$

LED $$ to be called as LED$4.$ Note: LED$4$ is to be active high.

$[5$ points$]$

iv$)$ Blink LED$4$ stated in part $1\mathrm{.}2$A$($iii$)$ using a suitable time delay.

$[7$ points$]$

Task $1\mathrm{.}2$B: Using Input Devices $($Switches$)$ to Control Output Devices $($LEDs$)$ by ESP$32$C$3$

Board

Connect two $(2)$ external switches to be labelled as $$SW$1$ and $$SW$2$ to any port and pin $($as

output$)$ of your choice. These switches will be used to control the illumination of LED$3$ and

LED$4$ introduced in part $1\mathrm{.}2$A$.$ For this purpose, write a RISC V assembly language program

$($Code::Blocks environment$)$ to achieve the following requirements:

i$)$ When switch $$SW$1$ is pushed, only the yellow LED $($LED$3)$ should be turned ON$,$ and when

the switch is released, only the green LED $($LED$4)$ should be ILLUMINATED.

$[9$ points$]$

ii$)$ When the switches $$SW$1$ and $$SW$2$ are not pushed, both LEDs $($LED$3$ and LED$4)$ should

be turned OFF. When $$SW$1$ is pressed while $$SW$2$ is not pressed, only the yellow LED

$($LED$3)$ should ILLUMINATE. Lastly, when both $$SW$1$ and $$SW$2$ are pressed, only the green

LED $($LED$4)$ should be ILLUMINATED.